JP6828313B2 - Randell type rotor magnetization inspection method - Google Patents

Description

The present invention relates to a method for inspecting the field magnets and rectifying magnets of a Randell type rotor.

Conventionally, as one type of rotor used in a motor, a rotor core having a plurality of claw-shaped magnetic poles in the circumferential direction and being combined is provided, and a field magnet is arranged between them to alternate each claw-shaped magnetic pole. A rotor having a so-called permanent magnet field Randell type structure that functions on different magnetic poles is known.

Further, in the rotor having a Randell type structure, in order to increase the output of the motor, a rectifying magnet for rectifying the magnetic path is arranged between the claw-shaped magnetic poles arranged alternately on the outer peripheral side of the field magnet. It has also been proposed (see Patent Document 1).

JP 2015-65794

In the Randell type rotor as described above, the field magnet is magnetized along the axial direction of the output shaft of the motor, and the rectifying magnet is polar-anisotropic magnetized so that the magnetic poles appear on the outer peripheral surface. Each of the magnetized field magnet and rectifying magnet is inspected to see if the magnetic force (magnetic flux amount) is within an appropriate range. In the manufacturing process of a Randell type rotor having such a field magnet and a rectifying magnet magnetizing step and an inspection step, it is desired to shorten the time required for the magnetizing inspection step.

In the rotor disclosed in Patent Document 1, a method of inspecting from the magnetization of a field magnet and a rectifying magnet is not disclosed.
An object of the present invention is to provide a magnetizing inspection method for a Randell type rotor capable of shortening the time required for the magnetizing inspection step of a field magnet and a rectifying magnet.

In the method for magnetizing a Randell type rotor that solves the above problems, a field magnet sandwiched between a pair of rotor cores is magnetized in the axial direction of the rotor core, and the rotor core is located on the outer peripheral side of the field magnet. The magnetizing step of magnetizing the rectifying magnet sandwiched between the magnets so that magnetic poles appear on the outer peripheral surface, and the magnetic force of the field magnet and the rectifying magnet magnetized in the magnetizing step. In the magnetizing inspection method of a Randell type rotor having an inspection step of inspecting, in the magnetizing step, the rectifying magnet and the rotor in a state where the field magnet is incorporated are set in the first magnetizing device and the rectification is performed. It includes a rectifying magnet magnetizing step of magnetizing a magnet and a field magnet magnetizing step of setting the rotor in a second magnetizing device and magnetizing the field magnet after the rectifying magnet magnetizing step. In the field magnet magnetizing step, the rotor set in the second magnetizing device has a magnetizing coil constituting the second magnetizing device along the circumferential direction of the rotor around the rotor. The inspection step is a rectification that measures the magnetic force of the rectifying magnet when the rotor is removed from the first magnetizing device after the magnetizing of the rectifying magnet. It includes a magnet inspection step and a field magnet inspection step of measuring the magnetic force of the field magnet when the rotor is removed from the second magnetizing device after magnetization of the field magnet.

According to this method, the magnetic force of the rectifying magnet is measured when the rotor in which the rectifying magnet and the field magnet are incorporated is removed from the first magnetizing device after the magnetizing of the rectifying magnet, and the field magnet is measured. The magnetic force of the field magnet is measured during the operation of being removed from the second magnetizing device after magnetization. That is, since the magnetizing process and the inspection process (measurement process) are performed in close proximity to each other, the time required for the magnetizing inspection process can be shortened.

In the magnetism inspection method of the Randell type rotor, the inspection step is based on the magnetic force of the rectifying magnet measured in the rectifying magnet inspection step and the magnetic force of the field magnet measured in the field magnet inspection step. Based on this, a determination step for determining whether or not the magnetism of the rectifying magnet and the field magnet is sufficient is provided, and when it is determined in the determination step that the magnetism of the rectifying magnet or the field magnet is insufficient. At least, it is preferable to further include a remagnetization step of remagnetizing the rectifying magnet or the field magnet on the side determined to be insufficiently magnetized.

According to this method, when it is determined in the determination step that the magnetizing of the rectifying magnet or the field magnet is insufficient, the rectifying magnet or the field magnet is remagnetized in the remagnetizing step. When remagnetizing, the rotor is set again in the first or second magnetizing device, but since the inspection step (determination step) is close to the magnetizing step (first and second magnetizing devices), the rotor It is possible to shorten the time to set again.

In the magnetization inspection method for the Randell type rotor, it is preferable that the rectifying magnet inspection step and the field magnet inspection step are performed at the same time.
According to this method, since the inspection of the rectifying magnet and the inspection of the field magnet are performed at the same time, the magnetizing inspection time can be further shortened.

In magnetizing the inspection method of the Lundell rotor, in the field magnet inspection process, when the operation of removing the rotor of wearing magnetizing of the field magnet from the second magnetizer, before Symbol second magnetizing performing magnetic measurements of the field magnet with the magnetization coils constituting the device.

According to this method, since the magnetizing coil constituting the second magnetizing device is also used for measuring the magnetic force of the field magnet, the device for magnetizing and inspecting can be miniaturized.

According to the magnetism inspection method of the Randell type rotor of the present invention, the time required for the magnetization inspection step of the field magnet and the rectifying magnet of the Randell type rotor can be shortened.

A front view of the brushless motor (Randel type motor) of one embodiment as viewed from the axial direction. A side view of a brushless motor of the same form. Sectional drawing of the brushless motor of the same form. An exploded perspective view of a brushless motor of the same form. An exploded perspective view of the rotor (Randel type rotor) of the same form and the sensor magnet disassembled. An exploded perspective view of a rotor of the same form. The perspective view which shows the magnetizing apparatus and inspection apparatus with respect to a rotor. The perspective view which shows the magnetizing apparatus and inspection apparatus with respect to a rotor. The perspective view which shows the magnetizing apparatus and inspection apparatus with respect to a rotor. The perspective view which shows the magnetizing apparatus and inspection apparatus with respect to a rotor. The flowchart for demonstrating the magnetizing inspection method of a field magnet and a rectifying magnet. The flowchart for demonstrating the magnetizing inspection method of a field magnet and a rectifying magnet. (A) and (b) are flowcharts for explaining the magnetizing inspection method of a field magnet and a rectifying magnet.

Hereinafter, an embodiment of a magnetization inspection method for the rotor of the Randell type motor will be described.
As shown in FIGS. 1 to 3, the brushless motor M of the present embodiment is a Randell type motor, for example, a motor used for a valve timing variable device connected to a vehicle engine.

The brushless motor M has a motor case 1. The motor case 1 has a tubular yoke 2, a base member 3, and a cover member 4. The tubular yoke 2 has a bottomed tubular shape, and the base member 3 is attached to the opening side thereof. The base member 3 is made of aluminum and is attached to the opening side of the tubular yoke 2. The cover member 4 has a substantially plate shape, and is attached to the base member 3 on the side opposite to the tubular yoke 2. The circuit board 5 is accommodated in the accommodation space composed of the base member 3 and the cover member 4.

In the brushless motor M, a stator 10 is fixed to the inner peripheral surface of the tubular yoke 2, and a rotor 20 having a rotating shaft 6 is arranged inside the stator 10. The rotating shaft 6 is a non-magnetic stainless steel shaft, and is housed and fixed in the bearing 7 formed in the bearing holding portion 2a formed in the tubular yoke 2 and in the bearing holding portion 3a formed in the base member 3. The bearing 8 is rotatably supported by the motor case 1. The bearing 8 is made of, for example, a magnetic material of SUJ2 (high carbon chrome bearing steel).

The tip of the rotating shaft 6 projects from the tubular yoke 2 to which the joint member 9 is attached. The joint member 9 is connected to the adjusting mechanism in order to transmit the rotational torque output from the motor M to the adjusting mechanism (not shown). The adjustment mechanism is connected to a camshaft (not shown) that opens and closes an engine valve (not shown). That is, the timing at which the adjusting mechanism operated by the rotational torque output from the motor M operates the camshaft to open and close the engine valve is adjusted.

[Stator]
As shown in FIGS. 3 and 4, the stator 10 is fixed to the inner peripheral surface of the tubular yoke 2. The stator 10 has a cylindrical stator core 11, and a plurality of teeth 12 arranged at equal pitches in the circumferential direction are formed on the stator core 11 so as to extend inward in the radial direction. Each tooth 12 is a T-shaped tooth, and its radial inner peripheral surface is an arc surface extending in the axial direction from a concentric arc centered on the central axis L of the rotating shaft 6.

Each of the three-phase windings is wound around each tooth 12 via an insulator 13. Specifically, as shown in FIG. 4, the 12 teeth 12 have three-phase windings in the circumferential direction, that is, U-phase windings 14, V-phase windings 15, and W-phase windings 16 in this order, for example. It is wound in a concentrated winding. Then, a three-phase driving current is supplied to these wound windings 14, 15 and 16, to form a rotating magnetic field in the stator 10, and the rotor 20 arranged inside the stator 10 rotates forward and reverse around the center of the rotating shaft 6. It is designed to let you.

[Rotor]
As shown in FIGS. 3 to 6, the rotor 20 includes the rotating shaft 6, the first and second rotor cores 21 and 31, a field magnet (main magnet) 40, a rectifying magnet (auxiliary magnet) 42, and the like. It has a sensor magnet 50.

[1st rotor core]
As shown in FIGS. 3 to 6, the first rotor core 21 is formed of an electromagnetic steel plate made of a soft magnetic material and is arranged on the base member 3 side. The first rotor core 21 has a substantially disk-shaped first core base 22, and a through hole 22a penetrating in the axial direction is formed at the center position thereof. A substantially cylindrical boss portion 22b is formed so as to protrude from the outer peripheral portion of the through hole 22a on the base member 3 side. In the present embodiment, the through hole 22a and the boss portion 22b are formed at the same time by burring. The outer diameter of the boss portion 22b is formed to be shorter than the outer diameter of the bearing 8 that rotatably supports one side of the rotating shaft 6. That is, the outer diameter of the boss portion 22b is formed to be shorter than the inner diameter of the bearing holding portion 3a for accommodating and fixing the bearing 8 provided on the base member 3.

The rotating shaft 6 is press-fitted into the through hole 22a (boss portion 22b) and inserted into the through hole 22a, and the first core base 22 is crimped and fixed to the rotating shaft 6. At this time, by forming the boss portion 22b, the first core base 22 is firmly crimped and fixed to the rotating shaft 6. Then, when the first core base 22 is crimp-fixed to the rotating shaft 6, the boss portion 22b is arranged so as to be separated from the bearing 8 housed and fixed in the bearing holding portion 3a in the axial direction ( (See FIG. 1).

On the outer peripheral surface 22c of the first core base 22, a plurality of (four in the present embodiment) first claw-shaped magnetic poles 23 are formed at equal intervals so as to project outward in the radial direction and extend in the axial direction. Here, in the first claw-shaped magnetic pole 23, a portion protruding outward in the radial direction from the outer peripheral surface 22c of the first core base 22 is referred to as a first base portion 24, and a tip portion bent in the axial direction is referred to as a first magnetic pole portion 25. That is.

The circumferential end surfaces 23a and 23b of the first claw-shaped magnetic pole 23 composed of the first base portion 24 and the first magnetic pole portion 25 are flat surfaces extending in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction). It has become. The angle of each of the first claw-shaped magnetic poles 23 in the circumferential direction, that is, the angle between the peripheral end surfaces 23a and 23b is set to be smaller than the angle of the gap between the first claw-shaped magnetic poles 23 adjacent to each other in the circumferential direction. There is.

Further, the radial outer surface 26 of the first magnetic pole portion 25 has a concentric arcuate surface whose cross-sectional shape in the orthogonal axis direction is centered on the central axis L of the rotating shaft 6, and two radial outer surfaces 26 thereof. It has an auxiliary groove 27. The auxiliary groove 27 is formed at a position deviated from the circumferential center of the radial outer surface 26 by the same angle on both sides. The auxiliary groove 27 has a U-shaped cross section in the direction orthogonal to the axis, that is, the bottom surface is formed by a curved surface.

[Second rotor core]
As shown in FIGS. 3 to 6, the second rotor core 31 has the same material and shape as the first rotor core 21, and is arranged on the tubular yoke 2 side. The second rotor core 31 has a disk-shaped second core base 32, and a through hole 32a penetrating in the axial direction is formed at the center position thereof. A substantially cylindrical boss portion 32b is formed so as to protrude from the outer peripheral portion of the through hole 32a on the tubular yoke 2 side. In the present embodiment, the through hole 32a and the boss portion 32b are formed at the same time by burring. The outer diameter of the boss portion 32b is formed to be shorter than the outer diameter of the bearing 7 that rotatably supports one side of the rotating shaft 6. That is, the outer diameter of the boss portion 32b is formed to be shorter than the inner diameter of the bearing holding portion 2a that accommodates and fixes the bearing 7 provided in the tubular yoke 2.

The rotating shaft 6 is press-fitted into the through hole 32a (boss portion 32b) and inserted into the through hole 32a, and the second core base 32 is crimp-fixed to the rotating shaft 6. At this time, by forming the boss portion 32b, the second core base 32 is firmly crimped and fixed to the rotating shaft 6. Then, when the second core base 32 is crimp-fixed to the rotating shaft 6, the boss portion 32b is arranged so as to be separated from the bearing 7 housed and fixed in the bearing holding portion 2a in the axial direction. (See Fig. 1).

On the outer peripheral surface 32c of the second core base 32, a plurality of (four in the present embodiment) second claw-shaped magnetic poles 33 are projected outward in the radial direction and extended in the axial direction at equal intervals. Here, in the second claw-shaped magnetic pole 33, a portion protruding outward in the radial direction from the outer peripheral surface 32c of the second core base 32 is referred to as a second base portion 34, and a tip portion bent in the axial direction is referred to as a second magnetic pole portion 35. That is.

Both end surfaces 33a and 33b in the circumferential direction of the second claw-shaped magnetic pole 33 composed of the second base portion 34 and the second magnetic pole portion 35 are flat surfaces extending in the radial direction. The circumferential angle of each of the second claw-shaped magnetic poles 33, that is, the angle between the peripheral end surfaces 33a and 33b is set to be smaller than the angle of the gap between the second claw-shaped magnetic poles 33 adjacent to each other in the circumferential direction. There is.

Further, the radial outer surface 36 of the second magnetic pole portion 35 has a concentric arcuate surface whose cross-sectional shape in the orthogonal axis direction is centered on the central axis L of the rotating shaft 6, and two radial outer surfaces 36 thereof. It has an auxiliary groove 37. The auxiliary groove 37 is formed at a position deviated from the circumferential center of the radial outer surface 36 by the same angle on both sides. The auxiliary groove 37 has a U-shaped cross section in the direction orthogonal to the axis, that is, the bottom surface is formed by a curved surface.

Then, such a second rotor core 31 is combined so as to face the first rotor core 21 so that each of the second claw-shaped magnetic poles 33 is between the first claw-shaped magnetic poles 23 of the first rotor core 21. At this time, the field magnet 40 is interposed between the inner side surface 32d of the second core base 32 and the inner side surface 22d of the first core base 22 in the axial direction.

[Field magnet]
As shown in FIG. 6, the field magnet 40 is a disk-shaped permanent magnet, and a through hole 40a is formed in the central portion thereof. The field magnet 40 has a cylindrical sleeve 41 inserted into the through hole 40a. The sleeve 41 is made of a non-magnetic material and is made of the same stainless steel as the rotating shaft 6 in the present embodiment. The outer diameter of the field magnet 40 is set to match the outer diameters of the first and second core bases 22 and 32. Therefore, the outer peripheral surface 40b of the field magnet 40 is flush with the outer peripheral surfaces 22c and 32c of the first and second core bases 22 and 32.

Therefore, the rotor 20 of the present embodiment is a so-called Randell type rotor using the field magnet 40. In the rotor 20, the first claw-shaped magnetic pole 23 as the north pole and the second claw-shaped magnetic pole 33 as the S pole are alternately arranged in the circumferential direction, and the number of magnetic poles is eight. That is, in the brushless motor M of the present embodiment, the number of poles of the rotor 20 is set to 2 × n (where n is a natural number), and the number of teeth 12 of the stator 10 is set to 3 × n. The number of poles of the rotor 20 is set to "8", and the number of teeth 12 of the stator 10 is set to "12".

[Rectifying magnet (auxiliary magnet)]
The rotor 20 is provided with a rectifying magnet 42 as an auxiliary magnet on the outer peripheral side of the field magnet 40. The rectifying magnet 42 is formed so as to form an annular shape. The field magnet 40 and the rectifying magnet 42 are made of different materials. Specifically, the field magnet 40 is, for example, an anisotropic sintered magnet, and is composed of, for example, a ferrite magnet, a samarium-cobalt (SmCo) magnet, a neodymium magnet, or the like. The rectifying magnet 42 is, for example, a bond magnet (plastic magnet, rubber magnet, etc.), and is composed of rare earth magnets such as a samarium iron nitrogen (SmFeN) magnet, a samarium cobalt (SmCo) magnet, and a neodymium magnet.

As shown in FIG. 6, the rectifying magnet 42 has a back magnet portion 43, 44 and an interpole magnet portion 45, and the back magnet portion 43, 44 and the interpole magnet portion 45 suppress the leakage flux, respectively. It is a magnetized polar anisotropic magnet.

More specifically, one of the back magnet portions 43 is arranged between the inner peripheral surface of the first magnetic pole portion 25 of the first claw-shaped magnetic pole 23 and the outer peripheral surface 32c of the second core base 32. The side of the back magnet portion 43 that abuts on the inner peripheral surface of the first magnetic pole portion 25 is the north pole having the same pole as the first magnetic pole portion 25, and the side that abuts on the outer peripheral surface 32c of the second core base 32 is the first. The radial component is mainly magnetized so as to have an S pole having the same pole as the 2-core base 32.

The other back magnet portion 44 is arranged between the inner peripheral surface of the second magnetic pole portion 35 of the second claw-shaped magnetic pole 33 and the outer peripheral surface 22c of the first core base 22. The side of the back magnet portion 44 that abuts on the inner peripheral surface of the second magnetic pole portion 35 is the S pole having the same pole as the second magnetic pole portion 35, and the side that abuts on the outer peripheral surface 22c of the first core base 22 is the first. The radial component is mainly magnetized so as to have the north pole of the same pole as the one core base 22.

The interpole magnet portion 45 is arranged between the first claw-shaped magnetic pole 23 and the second claw-shaped magnetic pole 33 in the circumferential direction. The interpole magnet portion 45 is mainly magnetized with a circumferential component so that the first claw-shaped magnetic pole 23 side becomes the N pole and the second claw-shaped magnetic pole 33 side becomes the S pole in the circumferential direction.

[Sensor magnet]
The sensor magnet 50 has a substantially rectangular cross section and an annular shape, but the central portion in the radial direction serves as a fixing surface 51 for fixing to the fixing portion A1 on the main body side of the rotor 20 on one end surface in the axial direction. ing. The fixed surface 51 is an annular flat surface provided over the entire circumference of the sensor magnet 50.

On the other hand, as the fixing portion A1 on the main body side of the rotor 20 for fixing the sensor magnet 50, an annular surface straddling the first rotor core 21 and the rectifying magnet 42, specifically, the first core base 22 first. An annular flat surface formed by the end face of the first base portion 24 of the one-claw magnetic pole 23, the end face of the back magnet portion 44 of the rectifying magnet 42, and a part of the end face of the interpole magnet portion 45 in the circumferential direction. It is a face.

Then, the sensor magnet 50 is pressure-bonded and fixed to the fixing portion A1 with an adhesive applied between the fixing surface 51 and the fixing portion A1 on the main body side of the rotor 20. In this way, the sensor magnet 50 is adhesively fixed so that its own magnetic pole and the magnetic pole of the rotor 20, that is, the first and second claw-shaped magnetic poles 23 and 33 correspond to each other.

[Magnetic sensor]
Further, in the brushless motor M of the present embodiment, a magnetic sensor 60 such as a Hall IC is provided on the circuit board 5 so as to face the sensor magnet 50 at a predetermined interval in the axial direction. Then, when the sensor magnet 50 rotates integrally with the rotor 20, the magnetic sensor 60 outputs a detection signal corresponding to the magnetic pole of the sensor magnet 50. The control circuit (not shown) that receives the detection signal from the magnetic sensor 60 calculates the rotation position (angle) of the rotor 20 and the rotation speed (speed) based on the detection signal, and calculates the rotation speed (speed) of the brushless motor M. Drive control is performed.

(First Embodiment of the magnetizing inspection method of the field magnet 40 and the rectifying magnet 42)
Next, a step of magnetizing the field magnet 40 and the rectifying magnet 42 constituting the Randell type rotor (rotor 20) as described above, and an inspection step of inspecting the magnetic force of the field magnet 40 and the rectifying magnet 42 after magnetization. Will be described with reference to FIGS. 7, 8 and 11.

Regarding the magnetizing steps of the field magnet 40 and the rectifying magnet 42, first, the magnetizing step of the rectifying magnet 42 is performed prior to the magnetizing step of the field magnet 40.
As shown in FIG. 7, the rotor 20 is set in the first magnetizing device D1. That is, the first magnetized portions 61 for the plurality of rectifying magnets are arranged along the outer peripheral portion of the rotor 20. Each first magnetizing portion 61 is configured by winding a coil 61b around a magnetizing yoke 61a, and is positioned so as to face the claw-shaped magnetic poles 23 and 33 of the rotor 20.

Then, the first magnetizing portion 61 that faces the first claw-shaped magnetic pole 23 and is excited to the N pole is located, and the first magnetizing that faces the second claw-shaped magnetic pole 33 and is excited to the S pole. It is installed so that the portion 61 is located.

By installing the rotor 20 in such a magnetizing device D1 and exciting the first magnetizing portion 61 by energizing the coil 61b, the rectifying magnet 42 has S poles and N on the outer peripheral surface in the radial direction. The poles appear and are magnetized as polar anisotropic magnets so that the poles are alternately positioned in the circumferential direction (step S11 in FIG. 11).

After magnetizing the rectifying magnet 42, the operation of removing the rotor 20 from the first magnetizing device D1 is performed. At this time, the amount of magnetic flux in each coil 61b of the magnetizing device D1 changes. The measuring unit 71 of the inspection device 70 connected to each coil 61b detects a change in the amount of magnetic flux passing through each coil 61b based on the rectifying magnet 42 after magnetization, and measures the magnetic force of the rectifying magnet 42 (step S12). .. The determination unit 72 of the inspection device 70 determines whether or not the magnetic force is insufficient (insufficient magnetic flux amount) in the magnetic force measurement of the rectifying magnet 42 (step S13). When the magnetic force of the rectifying magnet 42 is less than the appropriate value, that is, the magnetizing is insufficient (Yes in step S13), the rotor 20 is set in the magnetizing device D1 again, and the rectifying magnet 42 is remagnetized (Yes). Step S11). On the other hand, when the magnetic force of the rectifying magnet 42 is equal to or higher than an appropriate value, that is, when magnetizing is sufficient (No in step 13), the magnetizing step and the inspection step of the rectifying magnet 42 are completed. That is, with respect to the rectifying magnet 42, the magnetizing of the rectifying magnet 42 is repeated until the magnetic force (magnetic flux amount) becomes equal to or higher than an appropriate value. It should be noted that the rectifying magnet 42 may not be repeatedly magnetized. Further, the magnetic force measurement can be performed on all the coils 61b or on some coils 61b.

After the magnetizing step and the inspection step of the rectifying magnet 42, the magnetizing step of the field magnet 40 is performed. As shown in FIG. 8, in order to magnetize the field magnet 40, the rotor 20 is set in the second magnetizing device D2. The second magnetizing device D2 is configured as an air-core coil by winding the coil 62b on the outer peripheral surface of the tubular second magnetizing yoke 62a that covers the periphery of the rotor 20 along the circumferential direction thereof. Will be done.

Then, by energizing the coil 62b, a magnetic flux along the axial direction of the rotor 20 is generated in the second magnetizing yoke 62a, and the field magnet 40 is magnetized in the axial direction by the magnetic flux (step S14). ).

After magnetizing the field magnet 40, the operation of removing the rotor 20 from the second magnetizing device D2 is performed. At this time, the amount of magnetic flux in the coil 62b of the magnetizing device D2 changes. The measuring unit 81 of the inspection device 80 connected to the coil 62b detects a change in the amount of magnetic flux passing through the coil 62b based on the field magnet 40 after magnetization, and measures the magnetic force of the field magnet 40 (step S15). .. The determination unit 82 of the inspection device 80 determines whether or not the magnetic force is insufficient (insufficient magnetic flux amount) in the magnetic force measurement of the field magnet 40 (step S16). When the magnetic force of the field magnet 40 is less than the appropriate value, that is, the magnetizing is insufficient (Yes in step S16), the rotor 20 is set in the magnetizing device D2 again, and the field magnet 40 is remagnetized. (Step S14). On the other hand, when the magnetic force of the field magnet 40 is equal to or higher than an appropriate value, that is, when magnetization is sufficient (No in step S16), the magnetizing step and the inspection step of the field magnet 40 are completed. That is, with respect to the field magnet 40, the field magnet 40 is repeatedly magnetized until the magnetic force (magnetic flux amount) becomes equal to or higher than an appropriate value. It should be noted that the field magnet 40 may not be repeatedly magnetized.

(Second embodiment of the magnetizing inspection method for the field magnet 40 and the rectifying magnet 42)
FIG. 9 shows a second embodiment of the magnetizing inspection method for the field magnet 40. Also in this embodiment, similarly to the flow shown in FIG. 11, the magnetizing step of the rectifying magnet 42 is performed prior to the magnetizing step of the field magnet 40. Since the magnetizing step and the inspection step of the rectifying magnet 42 are the same as those in the first embodiment described above, the description of steps S11 to S13 shown in FIG. 11 will be omitted.

The rotor 20 is set in the third magnetizing device D3 in order to perform the magnetizing step of the field magnet 40. The third magnetizing device D3 includes a pair of third magnetizing portions 63a and 63b, and each magnetizing portion 63a and 63b is a columnar magnetizing yoke having a diameter substantially equal to the diameter of the field magnet 40. The coils 65a and 65b are wound around the 64a and 64b. The third magnetizing portions 63a and 63b are installed so that the magnetizing yokes 64a and 64b sandwich the rotor 20 in the axial direction.

Then, the rotor 20 is axially sandwiched between the circular end faces of the magnetizing yokes 64a and 64b of the third magnetizing portions 63a and 63b, and the coils 65a and 65b are energized so that the magnetizing yokes 64a and 64b are separated from each other. A magnetic flux along the axial direction of the rotor 20 is generated, and the field magnet 40 is magnetized in the axial direction by the magnetic flux (step S14).

After magnetizing the field magnet 40, the operation of removing the rotor 20 from the third magnetizing device D3 is performed. At this time, the amount of magnetic flux in each of the coils 65a and 65b of the magnetizing device D3 changes. The measuring unit 91 of the inspection device 90 connected to each of the coils 65a and 65b detects a change in the amount of magnetic flux passing through the coils 65a and 65b based on the field magnet 40 after magnetization, and measures the magnetic force of the field magnet 40. (Step S15). The determination unit 92 of the inspection device 90 determines whether or not the magnetic force is insufficient (insufficient magnetic flux amount) in the magnetic force measurement of the field magnet 40 (step S16). When the magnetic force of the field magnet 40 is less than the appropriate value, that is, the magnetizing is insufficient (Yes in step S16), the rotor 20 is set in the magnetizing device D3 again, and the field magnet 40 is remagnetized. (Step S14). On the other hand, when the magnetic force of the field magnet 40 is equal to or higher than an appropriate value, that is, when magnetization is sufficient (No in step S16), the magnetizing step and the inspection step of the field magnet 40 are completed. That is, with respect to the field magnet 40, the field magnet 40 is repeatedly magnetized until the magnetic force (magnetic flux amount) becomes equal to or higher than an appropriate value. Even in this case, the field magnet 40 may not be repeatedly magnetized. Further, the magnetic force measurement can be performed only with one of the coils 65a and 65b.

The following effects can be obtained by the magnetic field inspection method of the field magnet 40 and the rectifying magnet 42 of the first and second embodiments described above.
(1) The magnetic force measurement of the rectifying magnet 42 is measured when the rotor 20 is removed from the first magnetizing device D1, and the magnetic force measurement of the field magnet 40 is measured by the second or third magnetizing device D2. It is measured during the operation of removing the rotor 20 from D3. That is, in the first and second embodiments described above, the magnetizing step and the inspection step (measurement step) are set close to each other, and the magnetizing coils 61b, 62b, 65a, 65b are used for inspection (measurement). ) Is also used to share a part of the device, so the time required for the magnetizing inspection process can be shortened.

(2) When it is determined that the magnetizing of the rectifying magnet 42 or the field magnet 40 is insufficient, the rectifying magnet 42 and the field magnet 40 are remagnetized by the first to third magnetizing devices D1 to D3. It is said. When remagnetizing, the rotor 20 is set again in the magnetizing devices D1 to D3, but the inspection process (judgment process) is set close to the magnetizing process to share a part of the device, so the rotor The time for setting 20 again can be shortened.

(3) The coils 61b, 62b, 65a, 65b of the first to third magnetizing devices D1 to D3 are also used for inspection (measurement) of the rectifying magnet 42 and the field magnet 40. That is, since it is not necessary to separately provide a coil for measurement, it is possible to reduce the size of the device for magnetizing and inspecting.

(Third Embodiment of the magnetizing inspection method of the field magnet 40 and the rectifying magnet 42)
10 and 12 show another embodiment of the magnetizing inspection method of the rectifying magnet 42 and the field magnet 40. In this embodiment, a fourth magnetizing device D4 having both the magnetizing device D1 of the rectifying magnet 42 shown in FIG. 7 and the magnetizing device D3 of the field magnet 40 shown in FIG. 9 is used. Then, the fourth magnetizing device D4 performs a magnetizing step of the field magnet 40 (step S22) following the magnetizing step of the rectifying magnet 42 (step S21 in FIG. 12) with respect to the set rotor 20. Do it continuously.

After magnetizing the rectifying magnet 42 and the field magnet 40, an operation of removing the rotor 20 from the fourth magnetizing device D4, that is, an operation of removing from the magnetizing device D1 and the magnetizing device D3, respectively, is performed. At this time, the amount of magnetic flux in the coil 61b and the coil 65a (, 65b) of the magnetizing device D4 (D1, D3) changes. The measuring unit 101 for a rectifying magnet of the inspection device 100 connected to each coil 61b detects a change in the amount of magnetic flux passing through each coil 61b based on the rectifying magnet 42 after magnetization, and measures the magnetic force of the rectifying magnet 42 ( Step S23). Subsequently, the field magnet measuring unit 102 of the inspection device 100 connected to the coils 65a and 65b detects a change in the amount of magnetic flux passing through the coils 65a and 65b based on the field magnet 40 after magnetization. The magnetic flux of the field magnet 40 is measured (step S24).

The determination unit 103 of the inspection device 100 determines whether or not the magnetic force is insufficient (insufficient magnetic flux amount) in each magnetic force measurement of the rectifying magnet 42 and the field magnet 40 (step S25). When the magnetic force of the rectifying magnet 42 or the field magnet 40 is less than the appropriate value, that is, the magnetizing is insufficient (Yes in step S25), the rotor 20 is set in the magnetizing device D4 again, and the magnetizing is insufficient. The determined rectifying magnet 42 or field magnet 40 is remagnetized (step S21 or step S22). On the other hand, when the magnetic forces of the rectifying magnet 42 and the field magnet 40 are both equal to or higher than an appropriate value, that is, when magnetizing is sufficient (No in step S25), the magnetizing step and the inspection step of the rectifying magnet 42 and the field magnet 40 are completed. .. That is, with respect to the rectifying magnet 42 and the field magnet 40, the magnetizing of the rectifying magnet 42 and the field magnet 40 is repeated until the magnetic force (magnetic flux amount) becomes equal to or higher than an appropriate value.

In the magnetic field inspection method of the field magnet 40 and the rectifying magnet 42 of the third embodiment described above, in addition to the effects (1) to (3) obtained in the first and second embodiments described above, the following are shown. The effect can be obtained.

(4) Since the fourth magnetizing device D4 has both the first magnetizing device D1 and the third magnetizing device D3, the magnetizing step of the field magnet 40 is followed by the magnetizing step of the rectifying magnet 42. Can be performed continuously. Further, following the inspection (measurement) step of the rectifying magnet 42, the inspection (measurement) step of the field magnet 40 can be continuously performed.

The above embodiment may be carried out in the following embodiments.
-In the first to third embodiments, the coils 61b, 62b, 65a, 65b of the first to third magnetizing devices D1 to D3 are configured to be used for both magnetizing and inspection (measurement). However, an inspection (measurement) coil may be provided separately from the magnetizing coil.

In the third embodiment, a fourth magnetizing device D4 having both the first and third magnetizing devices D1 and D3 is used, and following the magnetic force measurement of the rectifying magnet 42 (step S23), the field magnet 40 Although the magnetic force measurement (step S24) is performed, the magnetic force measurement of the rectifying magnet 42 and the field magnet 40 may be performed at the same time as shown in step S33 of FIGS. 13A and 13B. In this case, the time required for the magnetizing inspection step can be further shortened.

Further, when the magnetic force of the rectifying magnet 42 or the field magnet 40 is less than the appropriate value, that is, the magnetizing is insufficient (Yes in step S34), the rectifying magnet 42 is reattached as shown in FIG. 13A. Magnetism may be performed (step S31), and then the field magnet 40 may be remagnetized (step S32). Further, as shown in FIG. 13B, the rectifying magnet 42 may be remagnetized and the field magnet 40 may be remagnetized at the same time (step S35). When the remagnetization is performed at the same time, the time required for the remagnetization can be shortened as compared with the case where the remagnetization is performed in sequence.

20 ... rotor, 21 ... first rotor core (rotor core), 31 ... second rotor core (rotor core), 40 ... field magnet, 42 ... rectifying magnet, 61b, 62b, 65a, 65b ... coil, D1 ... first magnetizing Device (first magnetizing device), D2 ... second magnetizing device (second magnetizing device), D3 ... third magnetizing device (second magnetizing device), D4 ... fourth magnetizing device (second magnetizing device) 1st magnetizing device, 2nd magnetizing device).

Claims (4)

A field magnet sandwiched between a pair of rotor cores is magnetized in the axial direction of the rotor core, and a magnetic pole appears on the outer peripheral surface of the rectifying magnet sandwiched between the rotor cores on the outer peripheral side of the field magnet. The magnetizing process for polar anisotropy magnetizing
An inspection step of inspecting the magnetic force of the field magnet and the rectifying magnet magnetized in the magnetizing step, and
In the magnetization inspection method of the Randell type rotor with
The magnetizing step includes a rectifying magnet magnetizing step in which the rectifying magnet and a rotor incorporating the field magnet are set in the first magnetizing device to magnetize the rectifying magnet, and the rotor is second. It is provided with a field magnet magnetizing step in which the field magnet is magnetized after being set in the magnetizing device and the rectifying magnet magnetizing step.
In the field magnet magnetizing step, in the rotor set in the second magnetizing device, the magnetizing coils constituting the second magnetizing device are formed around the rotor along the circumferential direction of the rotor. Arranged to be wound,
The inspection step includes a rectifying magnet inspection step of measuring the magnetic force of the rectifying magnet when the rotor is removed from the first magnetizing device after magnetizing the rectifying magnet, and magnetizing the field magnet. A method for magnetizing a Randell-type rotor, which comprises a field magnet inspection step of measuring the magnetic force of the field magnet when the rotor is later removed from the second magnetizing device. In the method for magnetizing a Randell type rotor according to claim 1,
The inspection step is based on the magnetic force of the rectifying magnet measured in the rectifying magnet inspection step and the magnetic force of the field magnet measured in the field magnet inspection step, and the rectifying magnet and the field magnet. Equipped with a determination process to determine whether or not the magnetism of
When it is determined in the determination step that the magnetism of the rectifying magnet or the field magnet is insufficient, at least the rectifying magnet or the field magnet on the side determined to be insufficiently magnetized is remagnetized. A magnetism inspection method for a Randell-type rotor, which further includes a remagnetization process. In the method for magnetizing a Randell type rotor according to claim 1 or 2.
A method for magnetizing a Randell type rotor, wherein the rectifying magnet inspection step and the field magnet inspection step are performed at the same time. In the method for magnetizing a Randell type rotor according to any one of claims 1 to 3 .
In the field magnet inspection process, when the operation of removing the rotor of wearing magnetizing of the field magnet from the second magnetizer, using the magnetization coil constituting the front Stories second magnetizing device A method for inspecting magnetism of a Randell type rotor, which comprises measuring the magnetic force of the field magnet.

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