JP6803307B2 - Stator test equipment and stator test method - Google Patents

Description

The present invention relates to a technique for testing a stator of an electric motor or the like, particularly an insulating state of a stator winding of the stator.

A rotating machine such as an electric motor includes a rotor and a stator. The stator has a stator core and a stator winding wound around the stator core. As the stator winding wound around the stator core, a coated wire having an insulating film coated around the conductor is used. Here, when the stator winding is wound around the stator core, the insulating film of the stator winding may be damaged due to contact between the stator windings or between the stator windings and other members. .. If the insulator and rotor are assembled to manufacture an electric motor with the insulation coating of the stator winding damaged, a short-circuit failure may occur at the damaged insulation coating and an overcurrent may flow. is there.
Therefore, a stator test device that tests the insulation state of the stator winding wound around the stator core (detects insulation failure of the stator winding) has been proposed. For example, a stator test apparatus as disclosed in Patent Document 1 (Japanese Unexamined Patent Publication No. 8-65965) is known. In the stator test apparatus disclosed in Patent Document 1, the insulation defect of the stator winding is determined by applying a test voltage to the stator winding. Various methods are used as a method for determining the insulation defect of the stator winding. For example, a method of determining insulation failure due to corona discharge or glow discharge, a method of determining insulation failure by measuring the voltage waveform between stator windings, and a method of determining insulation failure by measuring insulation resistance. A method or the like for determining is used.

Japanese Unexamined Patent Publication No. 8-65965

The stator test apparatus disclosed in Patent Document 1 can detect insulation defects in the stator windings, but the detection accuracy is low. Detecting defective insulation of the stator winding by conducting the test with the stator core placed on a metal plate connected to the ground, or by conducting the test in a vacuum device. The accuracy can be improved, but there is a limit.
The present invention has been devised in view of these points, and an object of the present invention is to provide a technique capable of improving the detection accuracy of insulation defects in the stator windings of the stator.

The first invention relates to a stator test apparatus for testing the insulation state of the stator windings constituting the stator.
The stator test apparatus of the present invention targets a stator having a stator core, a resin bobbin and a stator winding, and applies a test voltage to the stator winding to check the insulation state of the stator winding. Test (determine insulation failure of stator winding).
The stator core is preferably composed of a laminated body in which a plurality of electromagnetic steel sheets are laminated, and extends along the axial direction and extends along the circumferential direction when viewed in a cross section perpendicular to the axial direction. A yoke, a plurality of teeth extending radially centrally from the yoke, a space inside the stator core formed inside the plurality of teeth, and a plurality of teeth formed between two teeth adjacent in the circumferential direction. It has a slot. The teeth have a teeth base extending radially from the yoke to the center side in the radial direction, and a teeth tip portion provided on the radial center side of the teeth base and extending along the circumferential direction. The space inside the stator core is formed by the tip surface of the tip of the tooth at the tip of the tip of each tooth, and constitutes a rotor insertion space into which the rotor is inserted. The slot has a slot opening that communicates with the space inside the stator core between the tooth tips of the two teeth that form the slot.
The resin bobbin is formed of an insulating resin, and has an outer wall portion, a plurality of inner wall portions arranged on the radial center side of the outer wall portion, and a plurality of connecting portions for connecting the outer wall portion and each inner wall portion. The outer wall portion extends along the circumferential direction and the axial direction, and is arranged at a position facing the yoke. The inner wall portion extends along the circumferential direction and the axial direction, and is arranged at a position facing the tip portion of the teeth. The connecting portion extends along the radial direction between the outer wall portion and the inner wall portion, and is arranged at a position facing the tooth base of the tooth.
The stator winding is wound around the connecting portion of the resin bobbin and the teeth (teeth base) of the stator core in a state where the resin bobbins are arranged on both sides in the axial direction of the stator core. Typically, the stator winding moves the needle of the winder along the axial and radial directions with the needle of the winding machine inserted into the slot through the slot opening, as well as both axial sides of the stator core. In, by moving between adjacent slots along the circumferential direction, that is, in a centralized winding manner, the teeth of the stator core are wound.
The present invention includes a plurality of plate-shaped members connected to the ground and a support member for supporting the plurality of plate-shaped members while having conductivity. The plate-shaped member has surfaces on both sides in the thickness direction. The plate-shaped member is preferably formed integrally with the support member, but may be formed separately.
In the stator test device of the present invention, a test voltage generator that generates a test voltage applied to the stator winding and an insulating state of the stator winding, that is, insulation failure occurs in the stator winding. It is also equipped with an insulation defect discriminating device that discriminates the presence. As the test voltage generator and the insulation defect discriminating device, a test voltage generator and an insulation defect discriminating device having various known configurations are used.
Each plate-like member is separated from the stator winding in each slot between the stator windings wound around one and the other of the two teeth (teeth bases) forming each slot. The surface is supported by a support member so that it can be arranged so as to extend along the axial and radial directions. As a mode for supporting the plate-shaped member to the support member, various modes can be used.
As a mode of connecting the plate-shaped member to the ground, a mode of connecting to the ground via a conductive support member is preferably used, but the mode is not limited to this. For example, a mode in which the plate-shaped member is directly connected to the ground can be used.
When the stator winding is wound around the teeth of the stator core by a centralized winding method, a slot opening is provided between the stator windings wound on one and the other of the two teeth forming the slot. A space is formed in which the needle inserted into the slot can move along the axial and radial directions. Therefore, in the stator (stator core) of the centralized winding type, the plate-shaped member can be easily inserted into the slot in a state separated from the stator winding.
In the present invention, since the plate-shaped member having conductivity and connected to the ground is arranged in the slot in a state separated from the stator winding, the detection accuracy of the insulation defect of the stator winding is greatly improved. Can be improved.
In another aspect of the first invention, the support member has a base and a shaft. The base has a flat bottom (including "substantially flat"). The shaft portion extends from the base portion to the side opposite to the bottom surface of the base portion along a direction intersecting the extending direction of the bottom surface of the base portion. Preferably, the shaft portion is configured to extend in a direction perpendicular to (including "substantially right angles") the extending direction of the bottom surface of the base. Further, the support member is configured to be able to stand upright on a horizontal plane with the bottom surface of the base arranged downward.
The plurality of plate-shaped members extend at different positions along the circumferential direction centered on the center line of the shaft portion along the extending direction of the shaft portion and the direction intersecting the extending direction of the shaft portion. Be supported. Preferably, the plurality of plate-shaped members are supported so as to extend along a direction perpendicular to the extending direction of the shaft portion and the extending direction of the shaft portion (including "substantially right angle"). More preferably, the shaft portion extends in a direction perpendicular to the extending direction of the bottom surface of the base portion, and the plurality of plate-shaped members are oriented in the extending direction of the shaft portion and the direction perpendicular to the extending direction of the shaft portion ( It is configured to extend along a direction parallel to (including "substantially parallel") the extending direction of the bottom surface of the base.
The shaft portion of the support member is configured to be insertable from one side in the axial direction into the space inside the stator core of the stator core, and the plurality of plate-shaped members have slot openings in the plurality of slots. It is configured so that it can be inserted from one side in the axial direction via. The operation of inserting the shaft portion of the support member into the space inside the stator core of the stator core and the operation of inserting the plurality of plate-shaped members into the plurality of slots are preferably performed with respect to the support member. This is done by moving the core, but it may also be done by moving the support member relative to the stator core.
Preferably, the stator (stator core, resin bobbin) has a support member such that the axial direction of the stator core is parallel (including "substantially parallel") to the extending direction of the shaft portion of the support member. It is placed on the base of. Further, more preferably, the insulating member is arranged on the side of the base of the support member opposite to the bottom surface of the base, and the stator is placed on the side of the insulating member opposite to the base.
In this embodiment, in a state where a plurality of plate-shaped members supported by the support member are aligned with slot openings of a plurality of slots, the shaft portion of the support member is pivoted in the space inside the stator core of the stator core. By inserting from one side in the direction, a plurality of plate-shaped members can be easily inserted into a plurality of slots.
In another embodiment of the first invention, a plate-shaped member positioning mechanism for positioning a plurality of plate-shaped members at slot openings of a plurality of slots is provided.
In this embodiment, the plurality of plate-shaped members can be easily aligned with the slot openings of the plurality of slots.
In another aspect of the first invention, the plate-shaped member positioning mechanism is composed of at least one positioning pin and at least one positioning fitting portion.
The positioning pin extends from the base of the support member to the side opposite to the bottom surface of the base along a direction intersecting the extending direction of the bottom surface of the base, preferably along a direction perpendicular (including "approximately right angle"). To do. The positioning pin is preferably formed integrally with the base of the support member, but may be formed separately.
The positioning fitting portion is formed on the stator core, extends along the axial direction, and is configured so that the positioning pin can be fitted. Grooves and holes are used as the positioning fitting portion. Preferably, a positioning groove formed on the outer peripheral surface of the stator core and extending along the axial direction is used. The number and placement positions of the positioning pins and the positioning fitting portions can be appropriately selected. Preferably, two or three are provided. In addition, they are arranged at equal intervals along the circumferential direction.
The positioning pin is preferably conductive and is connected to ground. In this case, since the stator core is connected to the ground via the plate-shaped member positioning mechanism (positioning pin, positioning fitting portion), it is possible to more reliably detect the insulation failure of the stator winding. Various modes can be used to connect the positioning pin to the ground.
In this embodiment, the plate-shaped member positioning mechanism can be easily configured and the positioning operation is easy.
In another embodiment of the first invention, at least one of the resin bobbins arranged on both axial sides of the stator core is arranged on the opposite side of the stator core, has conductivity, and is connected to the ground. It has a cover. Preferably, the cover can be attached so as to cover the outer wall portion of the resin bobbin, and is formed in an annular shape having a cover inner space at a portion of the stator core facing the stator core inner space.
Various modes can be used to connect the cover to the ground. For example, a mode in which the cover is directly connected to the ground can be used. Alternatively, an embodiment in which the cover is connected to the ground via a positioning pin constituting a plate-shaped member positioning mechanism for positioning the plate-shaped member at the slot opening can be used. For example, at least one positioning groove is formed on the outer peripheral surface of the cover main body member so as to extend along the axial direction and to which the positioning pin can be fitted. In this case, the cover is positioned with respect to the support member (stator core) and is connected to ground via a positioning pin and a positioning groove.
The lead-out portion of the stator winding for connecting the stator winding to the power supply, the neutral point, or the like is routed in the recess formed by the outer wall portion, the inner wall portion, and the connecting portion of the resin bobbin. In the present embodiment, since a cover having conductivity and being connected to the ground is arranged on the opposite side of the resin bobbin from the stator core, the stator winding is routed in the recess of the resin bobbin. It is possible to accurately detect the insulation failure of the lead-out part.
The second invention relates to a stator test method for testing the insulation state of the stator windings constituting the stator.
The stator test method of the present invention targets a stator having a stator core, a resin bobbin and a stator winding, and applies a test voltage to the stator winding to check the insulation state of the stator winding. Test (determine insulation failure of stator winding).
The stator core extends along the axial direction, and when viewed in a cross section perpendicular to the axial direction, the stator core extends along the circumferential direction and a plurality of teeth extending from the yoke to the radial center side. , It has a stator core inner space formed inside a plurality of teeth and a plurality of slots formed between two teeth adjacent in the circumferential direction. The teeth have a teeth base and a teeth tip. The space inside the stator core is formed by the tip surface of the tip of the tip of each tooth. The slot has a slot opening that communicates with the space inside the stator core.
The resin bobbin is a position that connects the outer wall portion arranged at a position facing the yoke, a plurality of inner wall portions arranged at a position facing the tip portion of the teeth, the outer wall portion and each inner wall portion, and faces the base portion of the teeth. It has a plurality of connecting parts arranged in.
The stator winding is wound around the connecting portion of the resin bobbin and the teeth of the stator core with the resin bobbins arranged on both sides in the axial direction of the stator core. Typically, the stator windings are wound around the teeth of the stator core in a centralized winding fashion.
In the present invention, a plurality of plate-shaped members having conductivity and being connected to the ground are used. Then, each plate-shaped member is placed at a position in each slot so as to be separated from the stator winding between the stator windings wound around one and the other of the two teeth forming each slot. A test voltage is applied to the stator windings in a state of being arranged so as to extend along the direction and the radial direction.
The test voltage applied to the stator winding is generated by using test voltage generators having various known configurations. Further, the insulating state of the stator winding, that is, the occurrence of insulation failure in the stator winding is determined by using various known insulation defect determining devices.
In the present invention, since the plate-shaped member having conductivity and connected to the ground is arranged in the slot in a state separated from the stator winding, the detection accuracy of the insulation defect of the stator winding is greatly improved. Can be improved.

By using the stator test apparatus and the stator test method of the present invention, the accuracy of detecting insulation defects in the stator winding can be improved.

It is a figure which shows the state which attached the test auxiliary tool used in 1st Embodiment of the stator test apparatus of this invention to an example of a stator. It is a figure explaining the operation of attaching the test auxiliary tool used in the 1st Embodiment of the stator test apparatus of this invention to an example of a stator. It is a partial cross-sectional view of an example of a stator. It is a figure which shows the fin of the test auxiliary tool used in the 1st Embodiment of the stator test apparatus of this invention. It is sectional drawing of the test auxiliary tool used in 1st Embodiment of the stator test apparatus of this invention. It is a partially enlarged view of the state in which the test auxiliary tool used in the 1st Embodiment of the stator test apparatus of this invention is attached to an example of a stator. It is a figure which shows the state which attached the test aid used in the 2nd Embodiment of the stator test apparatus of this invention to another example of a stator. It is a figure explaining the operation of attaching the test auxiliary tool used in the 2nd Embodiment of the stator test apparatus of this invention to another example of a stator. It is a partial sectional view of another example of a stator. It is a figure which shows the fin of the test auxiliary tool used in the 2nd Embodiment of the stator test apparatus of this invention. It is sectional drawing of the test auxiliary tool used in the 2nd Embodiment of the stator test apparatus of this invention. It is a partially enlarged view of the state in which the test aid used in the 2nd Embodiment of the stator test apparatus of this invention is attached to another example of a stator.

Hereinafter, embodiments of the stator test apparatus and the stator test method of the present invention will be described with reference to the drawings.
The stator test apparatus of the present invention tests the insulation state of the stator winding by applying a test voltage (also referred to as “impulse voltage”) to the stator winding of the stator. The insulation state of the stator winding is determined by whether or not the stator winding has an insulation defect. Specifically, the stator test device of the present invention includes a test voltage generator that generates a test voltage and an insulation defect determination device that determines whether an insulation defect has occurred in the stator winding. As the test voltage generator for generating the test voltage, known test voltage generators having various configurations are used. Further, as the insulation defect determination device, known insulation defect determination devices having various configurations are used. For example, an insulation failure discriminating device that determines that insulation failure is caused by corona discharge or glow discharge, or an insulation failure that occurs by measuring the voltage waveform between the stator windings. An insulation defect determining device for determining the presence or absence and an insulation defect determining device for determining that an insulation defect has occurred by measuring the insulation resistance are used. Since the configurations of these test voltage generators and insulation defect position determination devices are known, detailed description thereof will be omitted in this specification.
Hereinafter, the stator test apparatus of the present invention or the test aid used in the stator test method of the present invention will be described.

In the present specification, the description "axial direction" refers to a rotation center line P passing through the rotation center of the rotor in a state where the rotor is rotatably arranged relative to the stator (FIGS. 1, FIG. 2. The directions shown in FIGS. 7 and 8) are shown. The description "circumferential direction of the stator core" is viewed in a cross section perpendicular to the axial direction (see FIGS. 3 and 9) in a state where the rotor is arranged so as to be rotatable relative to the stator. , Indicates a circumferential direction centered on the rotation center line P. The description "radial direction of the stator core" refers to the direction passing through the rotation center line P when viewed in a cross section perpendicular to the axial direction in a state where the rotor is arranged so as to be rotatable relative to the stator. Is shown. The description "the radial center side of the stator core" indicates the rotation center line P side along the radial direction, and the description "the radial outer circumference side of the stator core" indicates the rotation center line P along the radial direction. Indicates the other side.

The first embodiment of the stator test apparatus of the present invention will be described with reference to FIGS. 1 to 6. As described above, in the following, the test auxiliary tool 400 constituting the stator test device of the first embodiment will be described, and the description of the test voltage generator and the insulation defect determination device will be omitted.
FIG. 1 shows a state in which the test aid 400 of the first embodiment is attached to the stator 100. FIG. 2 is a diagram illustrating an operation of attaching the test aid 400 of the first embodiment to the stator 100. FIG. 3 is a partial cross-sectional view of the stator 100. FIG. 4 is a diagram showing the fins of the test aid 400 of the first embodiment, and FIG. 5 is a cross-sectional view of the test aid 400 of the first embodiment. FIG. 6 is a partially enlarged view of a state in which the test aid 400 of the first embodiment is attached to the stator 100.

The stator 100 is an example of a test object of the stator test apparatus of the first embodiment, and has a stator core 200 and a resin bobbin 300 as shown in FIGS. 2 and 3.

The stator core 200 is composed of a laminated body in which a plurality of electromagnetic steel sheets are laminated, and has a tubular shape extending along the axial direction. As shown in FIG. 3, the stator core 200 includes a yoke 210 extending along the circumferential direction and a plurality of yokes 210 extending radially from the yoke 210 when viewed in a cross section perpendicular to the axial direction. Has a teeth 220. The teeth 220 has a teeth base portion 221 extending radially from the yoke 210 to the center side in the radial direction, and a teeth tip portion 222 provided on the axial center side of the teeth base portion 221 and extending along the circumferential direction.
The yoke 210 has a yoke inner peripheral surface 211 and a yoke outer peripheral surface 212. The yoke inner peripheral surface 211 is the outer peripheral surface of the slot 215, and the yoke outer peripheral surface 212 is the stator core outer peripheral surface of the stator core 200. The teeth base 221 has a teeth base side surface 221a on one side in the circumferential direction and a teeth base side surface 221b on the other side in the circumferential direction. The tooth tip 222a is the tooth tip tip surface 222a, the tooth tip side surface 222b on one side in the circumferential direction, the tooth tip side surface 222c on the other side in the circumferential direction, the tooth tip rear end surface 222d on one side in the circumferential direction, and the other end surface in the circumferential direction. It has a rear end surface 222e of the tip of the teeth on the side.
The stator core inner space 200a is formed inside the teeth 220 (center line P side) by the tip surface 222a of the tip of the teeth. The stator core inner space 200a constitutes a rotor insertion space into which a rotor (not shown) is rotatably inserted.
Further, a slot 215 is formed between two teeth 220 adjacent to each other in the circumferential direction by a yoke inner peripheral surface 211, tooth base side surfaces 221a and 221b, and tooth tip rear end surfaces 222d and 222e. The slot 215 is located between two teeth 220 adjacent to each other in the circumferential direction (specifically, the circumference of the teeth 220 on one side in the circumferential direction, the side surface 222c of the tip of the teeth on the other side in the circumferential direction, and the teeth 220 on the other side in the circumferential direction. A slot opening 215a communicating with the stator core inner space 200a is provided between the tooth tip end side surface 222b on one side in the direction).
The positioning grooves 216a and 216b formed on the outer peripheral surface 212 of the stator core will be described later.

The resin bobbin 300 is formed of an insulating resin and is arranged on both sides of the stator core 200 in the axial direction.
The resin bobbin 300 has an outer wall portion 310, a plurality of connecting portions 320, and a plurality of inner wall portions 330. The outer wall portion 310 extends along the circumferential direction and the axial direction. The inner wall portion 330 is arranged on the radial center side of the outer wall portion 310, and extends along the circumferential direction and the axial direction. The connecting portion 320 extends along the radial direction so as to connect the outer wall portion 310 and each inner wall portion.
The outer wall portion 310 has an outer wall portion inner peripheral surface 311 and an outer wall portion outer peripheral surface 312. The connecting portion 320 has a connecting portion side surface 321 on one side in the circumferential direction and a connecting portion side surface 322 on the other side in the circumferential direction. The inner wall portion 330 has an inner wall portion front end surface 331, an inner wall portion rear end surface 332, an inner wall portion side surface 333 on one side in the circumferential direction, and an inner wall portion side surface 334 on the other side in the circumferential direction. Further, it has an inner wall portion notch surface 335 and 336 forming a notch portion 330a on one side in the circumferential direction between the tip surface 331 of the inner wall portion and the inner wall portion side surface 333 on one side in the circumferential direction, and has the inner wall portion tip surface 331 and the circumference. It has inner wall notched surfaces 337 and 338 that form a notch 330b on the other side in the circumferential direction with the inner wall side surface 334 on the other side in the direction.
In the resin bobbin 300, the outer wall portion 310, the plurality of connecting portions 320, and the plurality of inner wall portions 330 are arranged at positions facing the yoke 210 of the stator core 200, the tooth base 221 and the tooth tip 222 of the plurality of teeth 220. As such, they are arranged on both sides of the stator core 200 in the axial direction.
The bobbin inner space 300a is formed inside the inner wall portion 330 (on the center line P side) by the inner wall portion tip surface 331 of the inner wall portion 330, and the partial space 300b is formed between the two connecting portions 320 adjacent in the circumferential direction. Is formed. The bobbin inner space 300a and the subspace 300b of the resin bobbin 300 are arranged at positions facing the stator core inner space 200a and the slot 215 of the stator core 200.
Further, when the resin bobbin 300 is arranged on both sides in the axial direction of the stator core 200, as shown in FIG. 3, between the tooth tip portion 222 of the stator core 200 and the inner wall portion 330 of the resin bobbin 300. The voids S1 and S2 are formed in the space. That is, the inner wall forming the rear end surface 222d of the tooth tip on one side in the circumferential direction of the tooth tip 222 of the teeth 220 of the stator core 200 and the notch 330a on one side in the circumferential direction of the inner wall 330 of the resin bobbin 300. A space S1 on one side in the circumferential direction is formed between the cutout surfaces 335 and 336. Further, the inner wall forming the rear end surface 222e of the tooth tip on the other side in the circumferential direction of the tooth tip 222 of the teeth 220 of the stator core 200 and the notch 330b on the other side in the circumferential direction of the inner wall 330 of the resin bobbin 300. A space S2 on the other side in the circumferential direction is formed between the partial cutout surfaces 337 and 338.

The slot insulating member 230 is inserted into the slot 215 of the stator core 200. In FIG. 3, the slot insulating member 230 is formed by folding back an insulating sheet made of resin.
Then, the stator winding 250 is wound around the teeth 220 with the resin bobbins 300 arranged on both sides of the stator core 200 in the axial direction. In the stator 100 shown in FIGS. 1 to 3, the needle (not shown) for feeding the coil of the winding machine is inserted into the slot 215 via the slot opening 215a in the axial direction and the radial direction. By moving the stator core 200 in the circumferential direction between the slots 215 on both sides of the teeth 220 on both sides in the axial direction of the stator core 200, the teeth 220 (specifically, the teeth base 221) and the resin bobbin of the stator core 200. The stator winding 250 is wound around the connecting portion 320 of the 300. That is, the stator winding 250 is wound around the teeth 220 of the stator core 200 by a centralized winding method.
When the stator winding 250 is wound around the teeth 220 of the stator core 200 by the centralized winding method, the stator winding 250 is wound around one and the other of the two teeth 220 adjacent in the circumferential direction forming the slot 215 in the slot 215. Spaces along the axial and radial directions are formed between the stator windings 250 to move the needle.
The resin bobbin 300 has a recess formed by the outer wall portion 310, the inner wall portion 330, and the connecting portion 320. Further, in order to connect the stator winding 250 to a power source, a neutral point, or the like, the stator winding 250 is provided with a lead-out portion. The lead-out portion of the stator winding 250 is routed in the recess of the resin bobbin 300 in order to prevent contact with other parts.

Next, the test auxiliary tool 400 used in the stator test apparatus of the present embodiment will be described. As described above, when the stator winding 250 is wound around the teeth 220 of the stator core 200 by the centralized winding method, between the stator windings 250 wound around the teeth 220 adjacent in the circumferential direction in the slot 215. In addition, the space required for the movement of the needle of the winding machine is formed. The test aid 400 of the present embodiment is configured so that fins 413 having conductivity and being connected to the ground can be arranged in the space between the stator windings 250 in the slot 215.

The test auxiliary tool 400 of the present embodiment has a main body member 410, an insulating member 420, and a cover 430, as shown in FIGS. 2 to 3.

The main body member 410 is made of a conductive material and has a base portion 411, a shaft portion 412, and a plurality of fins 413. In the present embodiment, the base portion 411, the shaft portion 412, and the plurality of fins 413 are integrally formed.
The base 411 has a flat bottom surface 411a (including "substantially flat").
In the present embodiment, the test auxiliary tool 400 is configured to maintain an upright state on the horizontal plane by placing the bottom surface 411a of the base 411 on the horizontal plane.
The shaft portion 412 extends from the base portion 411 to the side opposite to the bottom surface 411a along a direction intersecting the extending direction of the bottom surface 411a of the base portion 411. In the present embodiment, the shaft portion 412 extends in a direction perpendicular to the extending direction of the bottom surface 411a (including "substantially right angle"). Further, the outer peripheral surface of the shaft portion 412 has a circular shape when viewed in a cross section perpendicular to the extending direction of the shaft portion 412 (the extending direction of the center line K of the shaft portion 412).
The fin 413 is formed in a plate shape having a first surface and a second surface on both sides in the thickness direction. The fin 413 corresponds to the "plate-shaped member" of the present invention.
The fins 413 extend at different positions along the circumferential direction centered on the center line K of the shaft portion 412 along the extending direction of the shaft portion 412 and the extending direction of the shaft portion 412. It is configured in. In the present embodiment, the fins 413 extend along a direction perpendicular to the extending direction of the shaft portion 412 and the extending direction of the shaft portion 412 (including "substantially right angle"). That is, the plurality of fins 413 extend radially around the center line K of the shaft portion 412.
In FIG. 5, the bottom surface 411a of the base 411 is along the orthogonal A-axis (horizontal direction of the paper surface) and B-axis (perpendicular direction to the paper surface) (parallel to the extending direction of the A-axis-B-axis plane). It is postponed. Further, the shaft portion 412 extends along a direction perpendicular to the extending direction of the bottom surface 411a, that is, along the C axis (vertical direction of the paper surface) orthogonal to the A axis and the B axis. Further, the plurality of fins 413 are parallel to the extending direction of the shaft portion 412 and the extending direction of the shaft portion 412, that is, the extending direction of the C axis and the extending direction of the A-axis-B axis plane ( It extends along a direction (including "approximately parallel").
The position of each fin 413 along the circumferential direction about the center line K of the shaft portion 412 is such that each fin 413 is inserted into each slot 215 of the stator core 200 via the slot opening 215a. It is set at a position where it can be inserted along the axial direction.
The positioning pins 415a and 415b will be described later.
The "support member" of the present invention is configured by the base portion 411 and the shaft portion 412 of the main body member 410.
The base portion 411, the shaft portion 412, and the plurality of fins 413 can be formed separately. In this case, at least the fins 413 are made of a conductive, thin and strong (rigid) material. For example, it is formed of iron, NAK80 (registered trademark), and carbon steel 45C. The base 411 and shaft 412 can also be made of the same material as the fins 413.

The insulating member 420 is formed of an insulating resin, and has an insulating member base portion 421, an insulating member shaft portion 422, and a plurality of insulating member wall portions 423.
The insulating member base 421 is arranged on the side of the base 411 of the main body member 410 opposite to the bottom surface 411a, and has a flat (including "substantially flat") mounting surface 421a on the opposite side of the base 411.
The insulating member shaft portion 422 extends in parallel (including "substantially parallel") with the extending direction of the shaft portion 412 in a state of covering the shaft portion 412 of the main body member 410. Further, the outer peripheral surface of the insulating member shaft portion 422 has a circular shape when viewed in a cross section perpendicular to the extending direction of the insulating member shaft portion 422. The plurality of fins 413 of the main body member 410 are configured to protrude from the outer peripheral surface of the insulating member shaft portion 422.
Each insulating member wall portion 423 extends from a position on the outer peripheral surface of the insulating member shaft portion 422 between two fins 413 adjacent to each other in the circumferential direction in the extending direction of the insulating member shaft portion 422 and the extending of the insulating member shaft portion 422. It is formed so as to extend along the direction intersecting the existing direction. The insulating member wall portion 423 is formed so as to be insertable into the stator core inner space 200a of the stator core 200.
The insulating member 420 (insulating member base portion 421, insulating member shaft portion 422, insulating member wall portion 423) prevents the fins 413 from coming into contact with other members.

The cover 430 is composed of a cover body member 431 having conductivity. The cover body member 431 is formed in a tubular shape (ring shape) having a cover inner space 431a inside. The cover body member 431 has an outer wall portion of the outer wall portion 310 of the resin bobbin 300 so as to cover the outer wall portion 310 with the cover inner space 431a facing the stator core inner space 200a on the opposite side of the stator core 200. It is configured so that it can be attached to 310.
The positioning grooves 432a and 432b will be described later.

Next, the operation of testing the insulation state of the stator winding of the stator using the stator test device of the first embodiment will be described.
First, the stator 100 and the test aid 400 are assembled. For example, the stator 100 is moved from the side opposite to the base portion 411 of the main body member 410 of the test auxiliary tool 400 toward the base portion 411 along the extending direction of the shaft portion 412 (insulating member shaft portion 422). At this time, the shaft portion 412 of the main body member 410 of the test auxiliary tool 400, the insulating member shaft portion 422 of the insulating member 420, and the insulating member wall portion 423 are placed on one side in the axial direction in the stator core inner space 200a of the stator core 200. It is inserted from (lower side of FIG. 2), and each fin 413 of the main body member 410 of the test aid 400 is placed in each slot 215 of the stator core 200 via the slot opening 215a on one side in the axial direction (FIG. 2). Align the test aid 400 with respect to the stator 100 so that it is inserted from the lower side of 2).
As shown in FIG. 6, the fin 413 is provided in the slot 215 between the stator windings 250a and 250b wound around one and the other of the two teeth 220 forming the slot 215. , Both stator windings are inserted so as not to come into contact with the windings 250a and 250b (in a separated state).
When the stator winding 250 is wound around the teeth 220 of the stator core 200 by the centralized winding method, the needle is moved between the stator winding 250a and the stator winding 250b in the slot 215. , Axial and radial spaces are formed. Therefore, by properly aligning the fins 413 with respect to the slot opening 215a, the fins 413 can be placed between the stator windings 250a and the stator windings 250b with both stator windings 250a and 250b. It can be inserted in a separated state.

In this embodiment, the fins 413 of the test aid 400 are positioned at the slot openings 215a of the stator core 200 in order to facilitate the alignment of the fins 413 with respect to the slot openings 215a of the slots 215 of the stator core 200. A positioning mechanism is provided. The fin positioning mechanism corresponds to the "plate-shaped member positioning mechanism" of the present invention.
The fin positioning mechanism includes at least one positioning pin provided on the main body member 410 of the test aid 400, which extends in a direction (including (substantially parallel)) extending in the extending direction of the shaft portion 412, and a stator core. It is provided in 200, extends along the axial direction, and is composed of at least one positioning fitting portion into which a positioning pin can be fitted.
In the test assist tool 400 of the present embodiment, the test auxiliary tool 400 extends from the base 411 of the main body member 410 to the side opposite to the bottom surface 411a along a direction perpendicular to the extending direction (including "substantially right angle") of the bottom surface 411a of the base portion 411. The existing positioning pins 415a, 415b, and 415c (positioning pins 415c are not shown) are provided at unequal intervals. Further, the positioning grooves 216a, 216b, and 216c (positioning) extending along the axial direction on the outer peripheral surface 212 of the stator core 200 and into which the positioning pins 415a, 415b, and 415c can be fitted (engaged). Grooves 216c (not shown) are formed.
The positioning positions of the positioning pins 415a to 415c along the circumferential direction centered on the center line K of the shaft portion 412 and the placement positions of the positioning grooves 216a to 216c along the circumferential direction centered on the rotation center line P are positioned. By engaging (engaging) the pins 415a to 415c in the positioning grooves 216a to 216c, each fin 413 is set to be arranged at a position facing the slot opening 215a of each slot 215.
In this embodiment, the positioning pins 415a to 415c are formed integrally with the conductive base portion 411 of the main body member 410. Therefore, when the base 411 is connected to the ground, the stator core 200 is connected to the ground via the positioning grooves 216a to 216c, the positioning pins 415a to 415c, and the base 411.

Next, the cover 430 is assembled to one of the resin bobbins 300.
In the present embodiment, as shown in FIG. 2, the resin bobbin 300 is arranged on the side opposite to the side where the shaft portion 412 of the main body member 410 of the test aid 400 is inserted into the stator core inner space 200a. The cover 430 is attached to the outer wall portion 310 of the above.
Further, in the present embodiment, a cover positioning mechanism for positioning the cover 430 with respect to the stator core 200 is provided.
The cover positioning mechanism is provided at least one positioning pin provided on the stator core and extending along the axial direction, and at least one provided on the cover and extending along the axial direction and to which the positioning pin can be fitted. It is composed of two positioning fittings. In this embodiment, the positioning pins 415a to 415c constituting the fin positioning mechanism are used as the positioning pins constituting the cover positioning mechanism. Further, positioning grooves 432a, 432b, and 432c are formed on the outer peripheral surface of the cover main body member 431 constituting the cover 430 so as to extend along the axial direction and into which the positioning pins 415a to 415c can be fitted. The positioning pins 415a to 415c provided on the base portion 411 of the main body member 410 are formed on the stator core outer peripheral surface 212 of the stator core 200 when the main body member 410 (fin 413) is assembled to the stator 100. It is fitted into the positioning grooves 216a to 216c, and extends along the axial direction of the stator core 200.
The cover 430 (cover body member 431) is attached to the outer wall portion 310 of the resin bobbin 300 so that the positioning pins 415a to 415c are fitted (engaged) with the positioning grooves 432a to 432c.
In this embodiment, the positioning pins 415a to 415c are formed integrally with the conductive base portion 411 of the main body member 410. Therefore, when the base portion 411 is connected to the ground, the cover 430 (cover body member 431) is connected to the ground via the positioning grooves 432a to 432c, the positioning pins 415a to 415c, and the base portion 411.
As a mode for connecting the cover 430 to the ground, a mode in which the cover 430 is directly connected to the ground can also be used. In this case, the cover positioning mechanism can be omitted.

Then, the test voltage generator 400 (main body member 410, insulating member 420, cover 430) is assembled to the stator 100, and each fin 413 and cover 430 (cover main body member 431) are connected to the ground. The test voltage generated from the above is applied to the stator winding 250, and the insulator winding 250 is used to determine whether or not the stator winding 250 has an insulation defect.
In this embodiment, the conductive and grounded fin 413 is located in each slot 215 of the stator core 200 at a position separated from the stator winding 250 between the stator windings 250. A test voltage is applied to the stator windings in a state where they are arranged so as to extend along the axial direction and the radial direction. As a result, it is possible to improve the detection accuracy of the insulation defect of the stator winding 250 inserted in the slot 215.
Further, a test voltage is applied to the stator winding in a state where the cover 430 (cover body member 431) having conductivity and connected to the ground is arranged so as to cover the outer wall portion 310 of the resin bobbin 300. There is. As a result, it is possible to improve the detection accuracy of the insulation defect of the drawing portion of the stator winding 250, which is routed in the recess of the resin bobbin 300.

Usually, after winding the stator winding around the tooth (after inserting the stator winding into the slot), to prevent the stator winding from popping inward (centerline side) from the slot opening. A winding insulating member that closes the slot opening is arranged in the slot opening so as to extend along the axial direction and the circumferential direction. When assembling the test aid 400 of the first embodiment to the stator in a state where the winding insulation member extending along the axial direction and the circumferential direction is arranged in the slot opening, the winding is wound. The insulating member gets in the way and it is difficult to insert each fin into the slot.
The stator test apparatus of the present invention can easily test the insulation state of the stator winding even for a stator in which the slot opening is provided with a winding insulating member that closes the slot opening. The second embodiment will be described with reference to FIGS. 7 to 12. Also in the present embodiment, only the stator test device or the test auxiliary tool 800 used in the stator test method of the present embodiment will be described, and the description of the test voltage generator and the insulation defect determination device will be omitted.
FIG. 7 shows a state in which the stator test device of the second embodiment is attached to the stator 500, and more particularly, a state in which the test aid 800 of the second embodiment is attached. FIG. 8 is a diagram illustrating an operation of attaching the test aid 800 of the second embodiment to the stator 500. FIG. 9 is a partial cross-sectional view of the stator 500. FIG. 10 is a diagram showing the fins of the test aid 800 of the second embodiment, and FIG. 11 is a cross-sectional view of the test aid 800 of the second embodiment. FIG. 12 is a partially enlarged view of the stator 500 with the test aid 800 of the second embodiment attached.

The stator 500 has the same configuration as the stator 100, except that a winding insulating member 640 that closes the slot opening 615a is arranged in the slot opening 615a. Therefore, in the following, only the winding insulation member 640 will be described. Of the codes attached to each component of the stator 500, the same code is attached except for the code attached to each component of the stator 100 and the third digit (hundreds). The components are the same.
The resin bobbin 700 has a notch portion 730a on one side in the circumferential direction formed by the notch surfaces 735 and 736 of the inner wall portion between the tip surface 731 of the inner wall portion of the inner wall portion 730 and the side surface 733 of the inner wall portion on one side in the circumferential direction. The notch portion 730b on the other side in the circumferential direction is formed by the notch surfaces 737 and 738 of the inner wall portion between the tip surface 731 of the inner wall portion of the inner wall portion 730 and the side surface 734 of the inner wall portion on the other side in the circumferential direction. have.
Then, when the resin bobbin 700 is arranged on both sides in the axial direction of the stator core 600, as shown in FIG. 9, between the tooth tip portion 622 of the stator core 600 and the inner wall portion 730 of the resin bobbin 700. The voids S1 and S2 are formed in the space. That is, the inner wall forming the rear end surface 622d of the tooth tip on one side in the circumferential direction of the tooth tip 622 of the teeth 620 of the stator core 600 and the notch 730a on the one side in the circumferential direction of the inner wall 730 of the resin bobbin 700. A space S1 on one side in the circumferential direction is formed between the cutout surfaces 735 and 736. Further, the inner wall forming the rear end surface 622e of the tooth tip on the other side in the circumferential direction of the tooth tip 622 of the teeth 620 of the stator core 600 and the notch 730b on the other side in the circumferential direction of the inner wall 730 of the resin bobbin 700. A space S2 on the other side in the circumferential direction is formed between the partial cutout surfaces 737 and 738.
In the stator 500, a rectangular resin insulating sheet is used as the winding insulating member 640 that closes the slot opening 615a of the slot 615 of the stator core 600. Then, the winding insulating member 640 is moved along the axial direction with the edges on both sides in the short side direction inserted into the space S1 on one side in the circumferential direction and the space S2 on the other side in the circumferential direction. As a result, the winding insulation member 640 is arranged at the position of the slot opening 615a so as to extend along the axial direction and the circumferential direction.

The test aid 800 used in the stator test apparatus of the present embodiment has the same configuration as the test aid 400 except that slits 814 are formed in the plurality of fins 813. Therefore, in the following, only the configuration of the fin 813 will be described. Of the codes attached to each component of the test aid 800, the same code is attached except for the code attached to each component of the test aid 400 and the third digit (hundreds). The components are the same.

The test auxiliary tool 800 has a main body member 810, an insulating member 820, and a cover 830, similarly to the test auxiliary tool 400. Further, the main body member 810 has a base portion 811 and a shaft portion 812, and a plurality of fins 813.
The plurality of fins 813 are located at different positions along the circumferential direction centered on the center line K of the shaft portion 812, in a direction intersecting the extending direction of the shaft portion 812 and the extending direction of the shaft portion 812, preferably at right angles. It is arranged so as to extend along the direction (including "approximately right angle"). That is, the plurality of fins 813 extend radially around the center line K of the shaft portion 812.
A slit 814 is formed in the fin 813. The slit 814 is a winding insulating member 640 when the fin 813 is inserted into the slot 615 of the stator core 600 from one side in the axial direction (lower side of the paper surface in FIG. 6) via the slot opening 615a. Is configured to be insertable. Specifically, the slit 814 communicates with the fin 813 in the thickness direction (circumferential direction centered on the center line K of the shaft portion 812), and extends parallel to the extending direction of the shaft portion 812. , The side opposite to the bottom surface 811a is open.

When testing the insulation state of the stator winding 650 of the stator 500 using the stator test apparatus of the second embodiment, first, the stator 500 and the test aid 800 are assembled.
The method of assembling the stator 500 and the test aid 800 is basically the same as the method of assembling the stator 100 and the test aid 400. That is, the shaft portion 812 of the main body member 810 of the test aid 800, the insulating member shaft portion 822 of the insulating member 820, and the insulating member wall portion 823 are arranged along the axial direction in the stator core inner space 600a of the stator core 600. , Each fin 813 of the main body member 810 of the test aid 800 is inserted from one side in the axial direction, and each fin 813 of the main body member 810 of the test auxiliary tool 800 is axially inserted into each slot 615 of the stator core 600 via the slot opening 615a. Assemble the stator 500 and the test aid 800 so that they are inserted from one side in the direction. At this time, the winding insulation member 640 provided in the slot opening 615a of the stator core 600 is inserted into the slit 814 formed in each fin 813 of the test aid 800. As a result, even if the slot opening 615a is provided with the winding insulating member 640 extending along the axial direction and the circumferential direction, the fin 813 is placed in the slot 615 via the slot opening 615a in the axial direction. And can be arranged so as to extend along the radial direction.
Next, the cover 830 is assembled to one of the resin bobbins 700. The method of assembling the cover 830 to the resin bobbin 700 is the same as the method of assembling the cover 430 to the resin bobbin 300.
Then, the test auxiliary tool 800 (main body member 810, insulating member 820, cover 830) is assembled to the stator 500, and each fin 813 and the cover 830 (cover main body member 831) are connected to the ground from the test voltage generator. The generated test voltage is applied to the stator winding 650, and the insulation defect determining device determines whether or not the stator winding 650 has an insulation defect.
In the present embodiment, as in the first embodiment, it is possible to improve the detection accuracy of the insulation defect of the stator winding 650 inserted in the slot 615 and to be routed in the recess of the resin bobbin 700. It is possible to improve the detection accuracy of the insulation defect of the lead-out portion of the stator winding 650.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions can be made.
The mode of connecting the fin (plate-shaped member) to the ground is not limited to the mode of connecting to the ground via the support member that supports the fin, and various modes such as the mode of directly connecting the fin to the ground are used. Can be done.
The mode of connecting the cover to the ground is not limited to the mode of connecting the cover to the ground via a cover positioning mechanism (positioning pin, positioning fitting portion) for positioning the cover with respect to the stator core and a support member, and the cover is connected to the ground. Various modes such as a mode of directly connecting to the ground can be used.
The number and arrangement positions of the positioning pins and the positioning fitting portions constituting the fin positioning mechanism and the cover positioning mechanism can be appropriately set.
The positioning fitting portion to which the positioning pin can be fitted (engaged), which constitutes the fin positioning mechanism and the cover positioning mechanism, is not limited to the positioning groove, and a positioning hole can also be used.
The winding insulating member that closes the slot opening is not limited to a resin insulating sheet, and a wedge can also be used.
As the resin bobbin, a resin bobbin having an inner wall portion in which a notch for inserting the edge portion of the winding insulation member is formed is used, but as the resin bobbin, resin bobbins having various configurations can be used.
The fin positioning mechanism (plate-shaped member positioning mechanism) for positioning the fins (plate-shaped member) of the test aid with respect to the slot opening of the stator core may be omitted.
A plurality of fins are formed integrally with the base portion and the shaft portion, but can also be formed separately.
The cover positioning mechanism for positioning the cover with respect to the stator core may be omitted.
Each part of the insulating member or the insulating member of the test auxiliary tool may be omitted as appropriate.
The stator tester of the second embodiment, which is suitable for testing a stator in which a winding insulation member is arranged in a slot opening, is suitable for testing a stator in which a winding insulation member is not arranged in a slot opening. It can also be used.
Although the case of testing a stator in which the stator winding is wound by a centralized winding method has been described, the stator test apparatus and the stator test method of the present invention can be used when testing a stator having various configurations. it can.
The present invention can also be configured as a test aid used in a stator test apparatus that tests the insulation state of a stator winding by applying a test voltage to the stator winding of the stator.
Each configuration described in the embodiment may be used alone, or a plurality of appropriately selected configurations may be used in combination.

100, 500 Stator 230, 630 Slot insulating member 250, 250a, 250b, 650, 650a, 650b Stator winding 200, 600 Stator core 200a, 600a Stator core inner space 210, 610 York 211, 611 York inner circumference Surfaces 212, 612 York outer peripheral surface (stator core outer peripheral surface)
215, 615 Slots 215a, 615a Slot openings 216a, 216b, 216c, 616a, 616b, 616c Positioning grooves 220, 620 Teeth 221, 621 Teeth bases 221a, 221b, 621a, 621b Teeth base sides 222, 622 Teeth tips 222a, 622a Teeth tip tip surface 222b, 222c, 622b, 622c Teeth tip side surface 222d, 222e, 622d, 622e Teeth tip rear end surface 300, 700 Resin bobbin 300a, 700a Bobbin inner space 300b, 700b Subspace 310, 710 Outer wall 311, 711 Outer wall inner peripheral surface 312, 712 Outer wall outer peripheral surface (resin bobbin outer peripheral surface)
320, 720 Connecting part 321, 322, 721, 722 Connecting part side surface 330, 730 Inner wall part 331, 731 Inner wall part tip surface 332, 732 Inner wall part rear end surface 333, 334, 733, 734 Inner wall part side surface 335, 336, 337, 338, 735, 736, 737, 738 Inner wall notch surface 330a, 330b, 730a, 730b Notch 400, 800 Test aid 410, 810 Main body member 411, 811 Base 411a, 811a Bottom surface 412, 812 Shaft 413, 813 Fin 415a, 415b, 415c, 815a, 815b, 815c Positioning pin 420, 820 Insulation member 421, 821 Insulation member base 421a, 821a Mounting surface 422, 822 Insulation member shaft 423, 823 Insulation member wall 430, 830 Cover 431, 831 Cover body member 431a, 831a Cover inner space 432a, 432b, 432c, 832a, 832b, 832c Positioning groove 640 Winding insulation member

Claims (6)

A stator test apparatus for testing the insulation state of the stator winding by applying a test voltage to the stator winding of a stator having a stator core, a resin bobbin and a stator winding.
The stator core extends along the axial direction, and when viewed in a cross section perpendicular to the axial direction, the yoke extends along the circumferential direction and the teeth base extending from the yoke toward the center in the radial direction. A plurality of teeth having a tooth tip portion provided on the radial center side of the tooth base and extending along the circumferential direction, a stator core inner space formed inside the plurality of teeth, and the plurality of teeth. It has a plurality of slots formed between two teeth adjacent to each other in the circumferential direction, and communicating with the space inside the stator core through a slot opening.
The resin bobbins are arranged on both sides in the axial direction with respect to the stator core, extend along the circumferential direction and the axial direction, and are arranged at positions facing the yoke, and the peripheral and axial directions. A plurality of inner wall portions extending along the line and arranged at positions of the plurality of teeth facing the tip portions of the teeth, and extending along the radial direction between the outer wall portion and the plurality of inner wall portions. It has a plurality of connecting portions of the plurality of teeth arranged at positions facing the base of the teeth.
The stator winding is wound around the plurality of teeth with the resin bobbins arranged on both sides in the axial direction with respect to the stator core.
With multiple plate-shaped members that are conductive and connected to the ground,
A support member for supporting the plurality of plate-shaped members is provided.
The plurality of plate-shaped members are separated from the stator winding between the stator windings wound around one and the other of the two teeth forming each slot in the plurality of slots. A stator test apparatus characterized in that it is supported by the support member so as to be able to be arranged so as to extend along the axial direction and the radial direction in a state. The stator test apparatus according to claim 1.
The support member has a base portion having a bottom surface, and a shaft portion extending from the base portion to the opposite side of the bottom surface along a direction intersecting the extending direction of the bottom surface.
The plurality of plate-shaped members extend at different positions along the circumferential direction centered on the shaft portion along the extending direction of the shaft portion and the direction intersecting the extending direction of the shaft portion. Supported by
The shaft portion of the support member is configured to be inserted into the space inside the stator core of the stator core from one side in the axial direction, and the plurality of plate-shaped members are inserted into the plurality of slots. , A stator test apparatus characterized in that it can be inserted from one side in the axial direction via the slot opening. The stator test apparatus according to claim 2.
A stator test device comprising a plate-shaped member positioning mechanism for positioning the plurality of plate-shaped members at positions facing the slot openings of the plurality of slots. The stator test apparatus according to claim 3.
The plate-shaped member positioning mechanism is formed on the stator core and at least one positioning pin extending from the base portion on the side opposite to the bottom surface along a direction intersecting the extending direction of the bottom surface. A stator test apparatus that extends along a direction and comprises at least one positioning fitting portion to which the at least one positioning pin can be fitted. The stator test apparatus according to any one of claims 1 to 4.
At least one of the resin bobbins arranged on both sides of the stator core in the axial direction is arranged on the opposite side of the stator core, has conductivity, and has a cover connected to the ground. Stator test device characterized by. A stator test method for testing the insulation state of the stator winding by applying a test voltage to the stator winding of a stator having a stator core, a resin bobbin and a stator winding.
The stator core extends along the axial direction, and when viewed in a cross section perpendicular to the axial direction, the yoke extends along the circumferential direction and the teeth base extending from the yoke toward the center in the radial direction. A plurality of teeth having a tooth tip portion provided on the radial center side of the tooth base and extending along the circumferential direction, a stator core inner space formed inside the plurality of teeth, and the plurality of teeth. It has a plurality of slots formed between two teeth adjacent to each other in the circumferential direction, and communicating with the space inside the stator core through a slot opening.
The resin bobbins are arranged on both sides in the axial direction with respect to the stator core, extend along the circumferential direction and the axial direction, and are arranged at positions facing the yoke, and the peripheral and axial directions. A plurality of inner wall portions extending along the line and arranged at positions of the plurality of teeth facing the tip portions of the teeth, and extending along the radial direction between the outer wall portion and the plurality of inner wall portions. It has a plurality of connecting portions of the plurality of teeth arranged at positions facing the base of the teeth.
The stator winding is wound around the plurality of teeth with the resin bobbins arranged on both sides in the axial direction with respect to the stator core.
The stator winding in which a plurality of plate-shaped members having conductivity and being connected to a ground are wound around one and the other of the two teeth forming each slot in the plurality of slots. The test voltage is applied to the stator winding in a state where the wires are arranged so as to extend along the axial direction and the radial direction at a position separated from the stator winding. Stator test method.

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