JP4641882B2 - Electric motor - Google Patents

Description

The present invention relates to a technique for providing an electric motor that can store a bearing that fixes an output shaft.

  An electric motor composed of a stator composed of a plurality of divided cores has a stator core divided in a direction perpendicular to the output shaft direction, and a multi-phase stator is configured by stacking the plurality of stator cores in the output shaft direction. Has been proposed (see, for example, Patent Document 1).

  A specific example will be described with reference to FIG. FIG. 8 is a schematic configuration diagram of a three-phase claw pole type electric motor having a claw-type magnetic pole disclosed in Patent Document 1. The stator cores 51 and 52 are stacked so that the claw-type magnetic poles face each other alternately, and a stator for one phase is realized by winding the ring coil 41 between them. Similarly, the stator cores 53 and 54 and the stator cores 55 and 56 are used as stators for the other two phases, and a total of three-phase motors. Thus, since each stator core alone has no means for coupling in the stacked direction, it is coupled by the end brackets 201 and 202 and the frame 301. Further, the end brackets 201 and 202 respectively require portions for receiving bearings 31 and 32 that hold the output shaft 1.

That is, in the above-described conventional technology, when a plurality of stator cores are stacked, there is no means for connecting the stator cores, and there is another means such as an end bracket or a frame for housing a bearing for fixing the output shaft of the motor. There is a problem that a member is required and the cost becomes high.
JP 2001-161054 A

  In view of the above problems, the present invention has a stator core that is divided in a direction perpendicular to the output shaft direction, and a bearing that fixes the output shaft in an electric motor that forms a multiphase stator by stacking the plurality of stator cores. An object of the present invention is to provide an electric motor having a structure that does not require a separate member such as an end bracket or a frame for housing the housing.

  In order to solve the above-described problems, the present invention provides a mechanism for housing bearings in the stator cores at both ends of the plurality of stator cores, and a guide mechanism serving as a reference for coupling to a load machine to which the output shaft is connected. And a stator core having this shape is three-dimensionally integrally formed using a dust core.

  In the present invention, a plurality of through holes for connecting the plurality of stator cores are formed in the outer peripheral portion in all of the plurality of stator cores integrally molded in a three-dimensional manner using the powder magnetic core. The through hole is arranged at a predetermined distance or angle with respect to the magnetic pole of the stator core, and a fastening means is inserted into the through hole to be integrated.

  According to the present invention, among a plurality of stator cores, a mechanism for housing a bearing and a guide mechanism for coupling with a load machine can be integrally formed with a dust core in the stator cores at both ends. The price can be reduced because there is no need for a separate part for housing the bearing.

  In addition, through holes for connecting all the stator cores can be provided in the outer peripheral portion of all the stator cores that are integrally molded with the powder magnetic core, and can be integrated by the fastening means, so that separate parts such as end brackets and frames are unnecessary. Therefore, the price can be reduced.

  An outline of an embodiment of the present invention will be described. The present invention includes an output shaft that transmits the rotational force generated by the rotor to the outside, and a multiphase stator that is multiphased by stacking a plurality of stator cores that are divided into a plurality of directions perpendicular to the output shaft direction, In a stator core of an electric motor provided with a bearing between the output shaft and the stator core, each stator core is integrally formed with a powder magnetic core, and a portion for housing the bearing is integrally formed in each stator core which becomes both ends of the multiphase stator. Molded.

  According to the present invention, in the stator of the electric motor, a portion for housing the bearing integrated with the stator cores at both end portions is disposed inside or outside the stator cores at both end portions, and is integrally formed with a powder magnetic core. According to the present invention, in the stator of the electric motor, a guide portion serving as a reference for coupling with a load machine to which the output shaft of the electric motor is connected is integrally formed on the outside of the stator core at both ends by a dust core.

  According to the present invention, in the stator of the electric motor, in each of the plurality of stator cores constituting the multiphase stator, a plurality of hole mechanisms for connecting the plurality of stator cores are provided in an outer peripheral portion, and the plurality of hole mechanisms are The stator core was arranged at a predetermined distance or angle with respect to the magnetic poles of the stator core, and was integrally formed with a dust core. Further, according to the present invention, in the stator of the electric motor, a plurality of long hole mechanisms for coupling the plurality of stator cores to each of the plurality of stator cores constituting the multiphase stator are provided on the outer peripheral portion, and the plurality of stator cores are predetermined. The plurality of long hole mechanisms have such a length that a common portion can be formed for all of the plurality of stator core magnetic poles, and the plurality of long hole mechanisms serve as magnetic poles of the stator core. Were arranged while maintaining a predetermined distance or angle, and integrally molded with a dust core.

  The best mode for carrying out the present invention will be described with reference to FIGS.

  FIG. 1 shows the entire structure of an electric motor according to an embodiment of the present invention, and the structure of one stator phase (middle V phase) will be described with reference to FIG. 2 which is a perspective view. This electric motor has a structure based on a claw pole type electric motor having claw-type magnetic poles. As shown in FIG. 2, the stator of the present invention has claw-shaped magnetic poles 532 and 542 arranged at predetermined intervals on the inner peripheral portions of the circular shaped stator cores 53 and 54, respectively, and the coil 42. Notch portions 531 and 541 are formed to pull out the coil end portions 421 and 422 to the outside, and are integrally molded by a dust core. The circular coil 42 is disposed between the outer peripheral portions of the stator cores 53 and 54 and the claw-type magnetic poles 532 and 542 on the inner periphery. The stator cores 53 and 54 are opposed to each other so that the claw-type magnetic poles alternate with each other, and the stator cores 53 and 54 are in close contact with each other with a structure in which the circular coil 42 is incorporated, thereby forming a stator for one phase. The coil end portions 421 and 422 of the circular coil 42 are drawn out from notches 531 and 541 provided on the outer peripheral portions of the stator cores 53 and 54, respectively. Here, since the stator cores 53 and 54 have symmetry, it can be realized by facing the cores molded in the same shape by the dust core.

  FIG. 1 is a cross-sectional view and a right side view when a three-phase motor is configured by stacking three stators. In this three-phase motor, the stator cores 81 and 52 constitute another one-phase stator (U-phase), and the stator cores 82 and 55 constitute another other one-phase stator (W-phase). The circular coils 41 and 43 are built in. The V-phase stator and the U-phase and W-phase stators are stacked to form a three-phase stator. The stacking angle relationship is determined by the position where each of them rotates by 120 degrees with respect to the claw magnetic pole as an electrical angle. Stack up.

  The stator cores 81 and 82 at both ends of all the stator cores have a symmetrical shape, and the ball bearings 31 and 32 can be accommodated and held together with the claw-type magnetic poles equivalent to the claw-type magnetic poles 532 of the stator core 53 inside. It has a special mechanism. Further, a reference guide for load machine coupling (hereinafter simply referred to as a guide mechanism) 811 (inlay joint) for facilitating connection with a load machine coupled by the output shaft 1 is provided on the outer side of the stator cores 81 and 82. (Corresponding to the function).

  The output shaft 1 supported by the stator cores 81 and 82 via the ball bearings 31 and 32 is coupled to the rotor 2 and transmits the rotational force generated by the rotor 2 to the load machine. Since the stator constituted by the stator cores 52 to 55, 81, and 82 does not have an axial coupling force, it is fixed using the frames 61 and 62. That is, the frames 61 and 62 have a bottomed cylindrical shape, and have a circular hole through which the ball bearing storage portion and the guide mechanism 811 are inserted in a circular bottom. It covers from both stator cores 81 and 82 at both ends, and is fixed with three through bolts 71 to 73. For this reason, the outer periphery of the frames 61 and 62 has holes through which the through bolts 71 to 73 can be passed.

  In the present embodiment, the shapes of the frames 61 and 62 are cylindrical, but the shape of the outer periphery can be freely selected as long as the inner periphery can be in close contact with the stator core. It is obvious that the number of through bolts for fixing both frames can be freely selected.

  According to the present embodiment, among all the stator cores, the stator cores 52 to 55 have the same shape, and the stator cores 81 and 82 have the same shape. Therefore, when molding with a dust core, two types of molds are used. This has the effect that all the stator cores can be molded.

  A second embodiment will be described with reference to FIG. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 indicate the same functions. In the first embodiment, the ball bearings 31 and 32 are disposed inside the stator cores 81 and 82 at both ends, whereas in the present embodiment, the ball bearings 31 and 32 are disposed outside the stator cores 91 and 92 at both ends. It is a thing. That is, the stator cores 91 and 92 at both ends have a symmetrical shape, and claw-shaped magnetic poles equivalent to the claw-shaped magnetic poles 532 of the stator core 53 shown in FIG. Furthermore, a guide mechanism 811 (corresponding to an inlay joint function) for facilitating connection with a load machine coupled with a mechanism capable of storing and holding the ball bearings 31 and 32 is provided outside the stator cores 91 and 92. It also has a structure.

  According to the present embodiment, by arranging the ball bearings 31 and 32 outside the stator cores 91 and 92, the diameter of the ball bearings 31 and 32 can be made larger than the diameter of the claw-type magnetic poles inside. Therefore, there is an effect that the diameters of the ball bearings 31 and 32 can be freely selected.

  Further, each of the forces applied to the stator cores 91 and 92 with respect to the axial force applied to the output shaft 1 acts on the center side of the motor. Therefore, even when using a dust core that is usually said to be inferior in mechanical strength to metal, there is an effect that the strength can be secured.

Example 3 will be described with reference to FIGS. 4 and 5. In FIG. 4, the same reference numerals as those in FIG. 1 have the same functions. This embodiment is obtained by Example 1 above, also eliminate the frames 61 and 62 that put in Example 2, was passed through Anagun 108 for coupling the stator core, it is provided on the outer periphery of the stator core itself is there. That is, the structure of the stator cores 101 to 106 is the same as that of the stator cores 81, 52 to 55, and 82 shown in FIG. All the stator cores 101 to 106 are fastened and fixed integrally by inserting and tightening through bolts 71 to 73 in three places in the through hole group 108. In this embodiment, the stator cores 101 to 106 are fastened and fixed by three through bolts 71 to 73. However, since all the through hole groups 108 can be used, it is obvious that the fixing position and number can be freely selected. is there.

  Here, the pitch θh of the through hole group 108 provided on the outer periphery of each of the stator cores 101 to 106 is expressed by the following equation (1).

θh = 360 ° / (3 × P) (1)
However, P: Number of claw magnetic poles per phase

  Next, the relationship of the through hole pitch θh will be described with reference to FIG. The interval between the claw magnetic poles facing each phase needs to be 180 ° in electrical angle. That is, as shown in FIG. 5, U-phase stator stator cores 101 and 102, V-phase stator stator cores 103 and 104, and W-phase stator stator cores 105 and 106 are paired, and claw magnetic poles are arranged at equal intervals. Further, since the phase between the phases is 120 °, the V-phase stator needs to be arranged with an electrical angle of 120 ° with respect to the U-phase stator, that is, the V-phase stator cores 103 and 104 facing each other. The arrangement is as shown in FIG. Furthermore, it is necessary to arrange the V-phase stator with an electrical angle of 240 ° with respect to the U-phase stator, that is, the arrangement of the opposing W-phase stator cores 105 and 106 is as shown in FIG.

  In FIG. 5, the claw magnetic pole position and the through hole position are the same, but it is obvious that the claw magnetic pole and the through hole do not need to be at the same position if the interval θh is maintained.

  In this embodiment, since the stator core molded with the dust core is exposed, the surface can be surface-treated with a mold or the like to protect it.

  According to the present embodiment, all the through hole groups 108 provided on the outer periphery of each stator core can be used for fixing, so that the fixing position and number can be freely selected.

  Further, among all the stator cores, the stator cores 101 and 106 and the stator cores 102 to 105 can be realized in the same shape. Therefore, when molding with a dust core, the stator core can be molded with two types of molds.

  Example 4 will be described with reference to FIGS. 6 and 7. 6 and 7, the same reference numerals as those in FIG. 1 have the same functions. In the third embodiment, even when the stator cores are stacked with a predetermined angle (electrical phase difference) in the configuration of the third embodiment in which through holes are provided at equal intervals in the entire outer periphery of the stator core. The through holes of all the stator cores are provided with the minimum through holes through which the bolts can be passed. In FIG. 6, a long hole 117, 118, and 119 extending on the circumference is provided in a portion of a range A that can be shared even when the stator cores 111 to 116 are stacked with a predetermined angle as described above. In FIG. 6, since there are three fixing points, all the stator cores 111 to 116 are fixed to each of the long holes 117 to 119 having an angle of 120 degrees using through bolts 71 to 73. The structure of the stator cores 111 to 116 is the same as that of the stator cores 101 to 106 in FIG.

  Next, the size and positional relationship of the long hole will be described with reference to FIG. The claw magnetic pole positions and the long hole positions of the stator cores 111 to 116 near the long hole 117 are shown. The claw magnetic pole position relationship of each of the stator cores 111 to 116 is the angle pitch θh as in FIG. Here, the minimum range A in which a common portion exists in each phase stator core arranged with a phase difference of 120 electrical degrees is five times the angle θh. Thereby, a through hole exists in a range where all the stator cores 111 to 116 are overlapped, and the stator core is fixed by the through bolt 71 at this position. Taking the U-phase stator as an example, the stator cores 113 and 114 are arranged to face each other. That is, when the stator core 114 is turned upside down, the stator core 113 and the positions of the magnetic pole and the long hole coincide with each other. It turns out that it is the same shape.

  According to the present embodiment, since the size of the long hole provided on the outer periphery of each stator core is the minimum size in which all the stator cores overlap, when molding is performed using a dust core having a low mechanical strength. Also, there is an effect that the strength can be improved as compared with the case where holes are provided in the entire circumference.

  Further, among all the stator cores, the stator cores 111 and 116 and the stator cores 112 to 115 can be realized in the same shape. Therefore, when molding with a dust core, the stator core can be molded with only two types of molds.

  The configuration in which the portions for housing the ball bearings 31 and 32 shown in the second embodiment are provided outside the stator cores 91 and 92 at both ends can be applied to the third and fourth embodiments.

The figure explaining the structure of the electric motor concerning Example 1 of this invention. The figure explaining the structure of the U-phase stator concerning Example 1 of this invention. The figure explaining the structure of the electric motor concerning Example 2 of this invention. The figure explaining the structure of the electric motor concerning Example 3 of this invention. FIG. 6 is a diagram illustrating the arrangement of stator fixing holes according to a third embodiment. The figure explaining the structure of the electric motor concerning Example 4 of this invention. The figure explaining the arrangement | positioning of the stator fixing hole of Example 4. FIG. The figure explaining the structure of the conventional electric motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Output shaft 2 Rotor 31, 32 Ball bearing 41-43 Circular coil 51-55 Stator core 61, 62 Frame 71-73 Through bolt 81, 82 End stator core 91, 92 End stator core 101, 106 End stator core 102-105 Stator core 111, 116 End stator core 112-115 Stator core 108 Stator core fixing hole group 117-119 Stator core fixing long hole 811 Reference guide for load machine coupling

Claims (7)

Comprising an output shaft for transmitting the rotational force generated by B over data to the outside, a circular coil and a plurality stacked stator to the output shaft direction,
Oite the motor said plurality of stator that is configured to incorporate the circular coil facing two stator core divided in a direction perpendicular to each of the output axis,
A plurality of stator core constituting the respective stator is integrally molded by each dust core,
Among the plurality of stator cores, the plurality of stator cores other than the two stator cores arranged at both ends have the same shape each having a plurality of claw-type magnetic poles and a notch portion for leading the coil end portion to the outside, The stator cores molded in the same shape are opposed to each other so that the claw-type magnetic poles alternate with each other,
The two stator cores arranged at the both ends have the same shape, and each of the portions that hold the output shaft via the bearings and store the bearings are integrally molded by a dust core. Electric motor . Oite to claim 1, wherein the electric motor,
Sites for housing the pre-Symbol bearings, electric motors, characterized in that <br/> disposed inside or outside each of the two stator core disposed in the end portions. Oite to claim 1, wherein the electric motor,
Serving as a reference guide portion for coupling with a load machine before Kide force shaft is connected, the outside of both ends two disposed on the stator core, characterized by being integrally molded with each dust core Electric motor . Oite to claim 1, wherein the electric motor,
To each of the plurality of stator cores, provided in the outer peripheral portion a plurality of holes mechanism for coupling the plurality of stator core, a predetermined distance or angle holes mechanism and the plurality of the pole having a plurality of stator cores each maintaining arranged, an electric motor, characterized in that integrally molded by a powder magnetic core. Oite to claim 1, wherein the electric motor,
Wherein the plurality of stator U-phase, V-phase, and three stator core of W-phase, to each of the plurality of stator cores, a plurality of long holes mechanism for coupling the multiple stator core constituting the plurality of stator core Bolts are provided in a plurality of through holes formed in the outer peripheral portion and formed by the hole mechanisms provided in the plurality of stator cores in a state where the phases of the three stator cores are arranged at 120 degrees. motor and said <br/> coupling a plurality stator core by passing. The electric motor according to claim 1, wherein
Each of the plurality of stator cores includes the predetermined number of hole mechanisms for connecting the plurality of constituent stator cores through a predetermined number of bolts on an outer peripheral portion;
Each of the predetermined number of hole mechanisms has the predetermined number of passages through which the hole mechanisms overlap each other of the plurality of status coils in a state where the stator cores are stacked at a predetermined angle. The length to form the hole,
The plurality of status cores are coupled by passing bolts through the predetermined number of through holes.
The electric motor according to claim 1, wherein each of the hole mechanisms of the plurality of stator cores is integrally formed with a dust core . The electric motor according to claim 1 , wherein
The stator cores molded into the same shape having symmetry are opposed to each other so that the claw-type magnetic poles of the stator cores are alternately arranged, so that the coil ends 421 and 422 of the circular coil are respectively connected to the stator core. An electric motor characterized by being drawn out from notches 531 and 541 provided on the outer periphery .

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