JP6798113B2 - motor - Google Patents

Description

The present invention relates to a motor.

Conventionally, for example, as shown in Patent Document 1, a motor including a stator having a so-called Randell type structure and a rotor having a permanent magnet facing the stator in the radial direction as a magnetic pole is known. A stator having a Randell type structure uses an annular stator core having a plurality of claw-shaped magnetic poles in the circumferential direction in pairs, and the claw-shaped magnetic poles of the pair of stator cores are combined so as to alternate in the circumferential direction, and the pair of stator cores are combined. A coil portion is arranged between the axial directions of the magnets so that the claw-shaped magnetic poles function as different magnetic poles.

Japanese Unexamined Patent Publication No. 2007-181303

By the way, it is desired to reduce the cogging torque in order to reduce the vibration in the above-mentioned motor. An object of the present invention is to provide a motor capable of reducing cogging torque.

A motor that solves the above problems has a pair of claw-shaped magnetic poles having a plurality of claw-shaped magnetic poles at equal-angle intervals with respect to an A-phase stator portion in which coil portions are arranged between a pair of stator cores having a plurality of claw-shaped magnetic poles at equal-angle intervals. The two-phase stator, in which the B-phase stator parts with the coil parts arranged between the stator cores of the above are arranged side by side in the axial direction with a predetermined electric angle shift, and the claw-shaped magnetic poles of the A-phase and B-phase stator parts face each other. A motor including a rotor having a permanent magnet, wherein the rotor has an A-phase rotor portion facing the A-phase stator portion and a B-phase rotor portion facing the B-phase stator portion. It is a two-phase rotor arranged side by side in the direction, and the permanent magnets of the A-phase and B-phase rotor portions are configured to be divided into two or more in the axial direction for each phase. In each phase, at least two of the divided permanent magnets are configured by shifting the arrangement angle, and the direction of shifting the arrangement angle is the A-phase rotor portion and the above when viewed in the axial direction. The B-phase rotor portion has the same direction, and the direction is the same as the direction in which the B-phase rotor portion is shifted with respect to the A-phase rotor portion, and the direction in which the arrangement angle is shifted is the shifting direction. In the case of two permanent magnets axially adjacent to each other between the A-phase rotor portion and the B-phase rotor portion, the permanent magnet on the B-phase rotor portion side of the two permanent magnets is the A-phase. against use rotor portion side of the permanent magnets, the arrangement angle are arranged to have the same position, without Oite displacement Tei in both of the shifting direction and its opposite direction.

According to this arrangement, in a two-phase rotor used in the two-phase stator at Lundell, permanent magnets of A-phase and B-phase rotor unit is divided axially into two or more plural, each phase configuration At least two of the divided permanent magnets are displaced from each other in each phase . Therefore, the change in the magnetic field on the rotor side becomes gentle for each phase , and the cogging torque of the motor can be reduced.

In the motor, the A-phase rotor portion has two permanent magnets having different arrangement angles arranged side by side in the axial direction, and the B-phase rotor portion has two arrangement angles different from each other. in which the permanent magnet is arranged in the axial direction.

According to this configuration, since two permanent magnets having different arrangement angles are provided for each phase, the change in the magnetic field for each phase becomes gentle, and the cogging torque of the motor can be further reduced.

In the motor, it is preferable that the permanent magnets provided in the A-phase and B-phase rotor portions have the same width in the axial direction.
According to this configuration, since the widths of the permanent magnets of the A-phase and B-phase rotor portions in the axial direction are the same, it is possible to improve the magnetic balance of the motor.

In the motor, the A-phase and B-phase rotor portions have an electric angle equal to the mutual displacement angle of the A-phase and B-phase stator portions, and the A-phase and B-phase stator portions are provided between each phase. It has a reference position at a position deviated in the opposite direction to the above, and is configured such that the pair of permanent magnets of each phase are arranged on both sides from the reference position of each phase by an angle of half of the electric angle. Is preferable.

According to this configuration, the A-phase and B-phase rotor portions have reference positions at positions shifted by the same predetermined electrical angle in the opposite direction to the A-phase and B-phase stator portions, and each phase is paired. The permanent magnets are offset from the reference position of each phase to both sides by half the electrical angle. Therefore, the change in the magnetic field of the permanent magnet for each phase becomes a gradual change including the reference position (appropriate position), and the cogging torque of the motor can be further reduced.

According to the motor of the present invention, the cogging torque can be reduced.

FIG. 3 is a perspective sectional view of the motor of the embodiment. An exploded perspective view of a motor of the same form. An exploded perspective view of a stator of the same form. (A) and (b) are explanatory views for explaining the positional relationship between the stator and the rotor of the embodiment. (A) and (b) are explanatory views for explaining the positional relationship between the stator and the rotor of the comparative example. (A) is a graph of cogging torque of the embodiment and the comparative example, and (b) is a graph showing the magnitude of each order component. (A) is a plan view of another example stator, and (b) is a cross-sectional view of the stator in the axial direction (XX of (a)). An exploded perspective view of another example stator. (A) is a partially disassembled perspective view of the stator of another example, and (b) and (c) are perspective views of the stator of another example. (A) is a perspective view of another example stator, and (b) is a sectional view thereof.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the motor M of the present embodiment is a brushless motor, which includes a rotor 10 rotatably supported by a support shaft on the housing side (not shown), and a stator 20 fixed to the housing. There is.

As shown in FIGS. 1 and 2, the rotor 10 is composed of a two-phase rotor portion of an A-phase rotor portion 11 and a B-phase rotor portion 12, and each of these rotor portions should be configured. , A rotor core 13 made of a magnetic material, and four magnets (first magnet 14a for A phase, second magnet 14b for A phase, first magnet 15a for B phase, second magnet 15b for B phase) fixed to the rotor core 13. ) And.

The rotor core 13 has a cylindrical inner peripheral side cylindrical portion 13a centered on the axis L of the rotor 10 and an outer peripheral side located on the outer peripheral side of the inner peripheral side cylindrical portion 13a having a cylindrical shape centered on the axis L. It has a cylindrical portion 13b and an upper bottom portion 13c that connects one end (upper end) of the inner peripheral side cylindrical portion 13a and the outer peripheral side cylindrical portion 13b in the axial direction. The upper bottom portion 13c is formed in a flat plate annular shape orthogonal to the axis L. In the rotor core 13, the inner peripheral surface of the inner peripheral side cylindrical portion 13a is supported by a bearing (also not shown) with respect to the support shaft (not shown).

On the inner peripheral surface of the outer peripheral side cylindrical portion 13b, the first magnet 14a for A phase, the second magnet 14b for A phase, and the first magnet for B phase are axially oriented from the open end side of the rotor core 13 toward the upper bottom portion 13c. 15a and the second magnet for B phase 15b are arranged in this order. The A-phase first and second magnets 14a and 14b have the same axial width and are provided at positions facing the A-phase stator portion 21 described later in the radial direction to form the A-phase rotor portion 11. Similarly, the B-phase first and second magnets 15a and 15b have the same axial width as each other and also with respect to the A-phase first and second magnets 14a and 14b, and the B-phase stator portion described later. It is provided at a position facing the 22 in the radial direction and constitutes the B-phase rotor portion 12. The magnets 14a, 14b, 15a, and 15b are magnetized in the radial direction, and the north and south poles are alternately formed at equal intervals in the circumferential direction. Further, the number of poles is the same as each other, and the rotor 10 of the present embodiment is composed of 12 poles (six pole pairs).

The stator 20 includes stator portions 21 and 22, which form an annular shape, respectively. In the present embodiment, the stator portion 21 is used for the A phase, and the driving current of the A phase is supplied. Further, the stator portion 22 is used for the B phase, and the driving current of the B phase is supplied.

The stator portions 21 and 22 have the same configuration and shape, and are arranged side by side in the axial direction. The A-phase stator portion 21 is arranged on the axially open end side (lower side) of the rotor core 13, and the B-phase stator portion 22 is arranged on the upper bottom portion 13c side (upper side) in the axial direction. As a support structure for each of the stator portions 21 and 22, the A-phase stator portion 21 is supported by the housing (not shown), and the B-phase stator portion 22 is supported by the A-phase stator portion 21. ing.

In the motor M having the above configuration, as shown in FIG. 1, the A-phase rotor 21 including the A-phase stator portion 21 and the A-phase first and second magnets 14a and 14b arranged on the outer peripheral side thereof is included. The A-phase motor section MA is composed of the sections 11. Similarly, the B-phase motor portion MB is composed of the B-phase stator portion 22 and the B-phase rotor portion 12 including the B-phase first and second magnets 15a and 15b arranged on the outer peripheral side thereof. ..

As shown in FIG. 3, the A-phase and B-phase stator portions 21 and 22, respectively, have a pair of stator cores (first stator core 23 and second stator core 24) having the same shape, and the pair of stator cores 23 and 24, respectively. It is provided with a coil portion 25 arranged between the two.

Each of the stator cores 23 and 24 includes a cylindrical portion 26 and a plurality of (12 in this embodiment) claw-shaped magnetic poles 27 and 28 extending from the cylindrical portion 26 to the outer peripheral side. The claw-shaped magnetic pole formed on the first stator core 23 is referred to as the first claw-shaped magnetic pole 27, and the claw-shaped magnetic pole formed on the second stator core 24 is referred to as the second claw-shaped magnetic pole 28. The claw-shaped magnetic poles 27 and 28 have the same shape as each other. Further, the first claw-shaped magnetic poles 27 are provided at equal intervals (30 degree intervals) in the circumferential direction, and the second claw-shaped magnetic poles 28 are also provided at equal intervals (30 degree intervals) in the circumferential direction.

Each of the claw-shaped magnetic poles 27 and 28 extends radially outward from the cylindrical portion 26 and is bent at a right angle so as to face the axial direction in the middle. Here, in each of the claw-shaped magnetic poles 27 and 28, the portion extending radially outward from the cylindrical portion 26 is referred to as a radial extending portion 29a, and the tip portion bent in the axial direction is referred to as a magnetic pole portion 29b. The radial extending portion 29a is formed so that the circumferential width becomes narrower toward the outer peripheral side. The outer peripheral surface (radial outer surface) of the magnetic pole portion 29b is formed as an arc surface centered on the axis L.

The stator cores 23, 24 including the claw-shaped magnetic poles 27, 28 having a right-angled shape may be manufactured by bending from a plate material, or may be manufactured by casting using a molding die.
The first and second stator cores 23 and 24 having the above configuration are assembled so that their first and second claw-shaped magnetic poles 27 and 28 (magnetic pole portions 29b) face each other in the axial direction (see FIG. 3). Further, in this assembled state, the magnetic pole portions 29b of the first claw-shaped magnetic pole 27 and the magnetic pole portions 29b of the second claw-shaped magnetic pole 28 are alternately arranged at equal intervals in the circumferential direction. That is, the stator 20 of the present embodiment is composed of 24 poles. Further, in the first and second stator cores 23 and 24, their cylindrical portions 26 are brought into contact with each other in the axial direction and fixed to each other.

Further, in this assembled state, the coil portion 25 is interposed between the axial directions of the first and second stator cores 23 and 24. The coil portion 25 is made of an insulating resin interposed between the winding 25a wound in an annular shape along the circumferential direction of the stator 20 and the winding 25a and the first and second stator cores 23 and 24. It is equipped with a bobbin 25b. Further, the coil portion 25 is arranged between the radial extension portion 29a of the first claw-shaped magnetic pole 27 and the radial extension portion 29a of the second claw-shaped magnetic pole 28 in the axial direction, and is arranged in the radial direction. Is arranged between the cylindrical portion 26 of the stator cores 23 and 24 and the magnetic pole portions 29b of the claw-shaped magnetic poles 27 and 28.

The A-phase and B-phase stator portions 21 and 22 configured as described above have a so-called Randell type structure. That is, the A-phase and B-phase stator portions 21 and 22 have a first and second claw shape due to the current supplied to the winding 25a of the coil portion 25 arranged between the first and second stator cores 23 and 24. It has a 12-pole Randell type structure that excites the magnetic poles 27 and 28 to different magnetic poles from time to time.

Here, the motor M1 in the comparative example to be compared with the motor M of the above embodiment will be described.
The motor M1 in the comparative example includes a rotor 50 as shown in the schematic configuration of FIG. 5 (a) and a stator 60 as shown in the schematic configuration of FIG. 5 (b). The stator 60 is composed of a two-phase stator having a Randell-type structure, that is, an A-phase stator portion 61 and a B-phase stator portion 62. Since the stator portions 61 and 62 in the comparative example have the same configuration as the stator portions 21 and 22 of the above embodiment, detailed description thereof will be omitted.

On the other hand, the rotor 50 in the comparative example is paired with the A-phase stator portion 61 and the B-phase stator portion 62 and is paired with the A-phase rotor portion 51 and the B-phase rotor portion in substantially the same manner as the rotor 10 of the above embodiment. Although 52 is provided, the arrangement configuration of the magnets of the rotor portions 51 and 52 is different. Specifically, the rotor 50 of the comparative example has one A-phase magnet 53 in the axial direction in the A-phase rotor portion 51 facing the A-phase stator portion 61, and also faces the B-phase stator portion 62. The B-phase rotor portion 52 has one B-phase magnet 54 in the axial direction. That is, in the rotor portions 11 and 12 of the rotor 10 of the above embodiment, two magnets 14a, 14b, 15a and 15b are arranged in the axial direction, whereas each rotor of the rotor 50 of the comparative example is arranged. In the portions 51 and 52, one magnet 53 and 54 are arranged in the axial direction.

Further, in the motor M1 of the comparative example, in the stator 60, the B-phase stator portion 62 is arranged in the stator 60 with the electric angle θ1 (45 degrees in the present embodiment) shifted in the clockwise direction with respect to the A-phase stator portion 61. At 50, the B-phase rotor portion 52 is arranged so as to be offset by the electric angle θ2 (45 degrees in this embodiment) in the counterclockwise direction with respect to the A-phase rotor portion 51. That is, in the motor M1 of the comparative example, the phase difference between the A-phase motor section and the B-phase motor section is set to 90 degrees. Therefore, the secondary components of the cogging torque of each phase motor have the same waveform shape and opposite phases and cancel each other out, so that the cogging torque can be effectively reduced even in the motor M1 of the comparative example. It has a good structure.

Compared to the motor M1 of such a comparative example, the motor M of the present embodiment has a configuration capable of reducing the cogging torque more effectively.
More specifically, as shown in FIG. 4B, first, in the stator 20, the A-phase and B-phase stator portions 21 and 22 are displaced in the same manner as the stator portions 61 and 62 of the stator 60 of the comparative example. It is composed of. That is, the first and second claw-shaped magnetic poles 27 and 28 of the B-phase stator portion 22 have an electric angle θ1 in the clockwise direction with respect to the first and second claw-shaped magnetic poles 27 and 28 of the A-phase stator portion 21, respectively. They are arranged so as to be offset by (45 degrees in this embodiment).

On the other hand, in the rotor 10 of the present embodiment, as shown in FIG. 4A, the first and second magnets 14a, 14b, B for the A phase are used in the rotor portions 11 and 12 for the A phase and the B phase, respectively. Magnets separated into two in the axial direction in each phase are used, such as the first and second magnets 15a and 15b for phase use. Here, in the A-phase and B-phase rotor portions 11 and 12 units, the B-phase rotor portion 12 has an electric angle θ2 in the counterclockwise direction with respect to the A-phase rotor portion 11 (45 degrees in this embodiment). They are arranged in a staggered manner. In other words, the reference positions La and Lb of the rotor portions 11 and 12 of each phase are displaced by the electric angle θ2.

Then, in the A-phase rotor portion 11, the A-phase first magnet 14a deviates from the reference position La by an electric angle θ3 (22.5 degrees in this embodiment) in the clockwise direction. The two magnets 14b are arranged so as to be offset by the same electric angle θ3 in the counterclockwise direction. In the B-phase rotor portion 12, the B-phase first magnet 15a deviates from the reference position Lb by an electric angle θ4 (22.5 degrees in this embodiment) in the clockwise direction. The 15b are arranged so as to be offset by the same electric angle θ4 in the counterclockwise direction. The adjacent second magnet 14b for A phase and the first magnet 15a for B phase have the same circumferential position depending on the respective shift directions and shift angles.

Further, also in the motor M of the present embodiment using the A-phase and B-phase rotor portions 11 and 12 having such a configuration and the above-mentioned stator portions 21 and 22, the A-phase motor portion MA and the B-phase motor portion are also used. The phase difference with the MB is set to 90 degrees. The A-phase drive current is supplied to the winding 25a of the coil portion 25 of the A-phase stator portion 21, and the B-phase drive current is supplied to the winding 25a of the coil portion 25 of the B-phase stator portion 22. The A-phase drive current and the B-phase drive current are alternating currents, and the phase difference between them is set to 90 degrees in this embodiment. As a result, rotational torque is generated in relation to the stator portions 21 and 22 and the magnets 14a, 14b, 15a, and 15b, and the rotor 10 is rotationally driven.

At that time, as shown in FIG. 6A, the cogging torque T of the motor M of the present embodiment is further suppressed as compared with the cogging torque T1 of the motor M1 of the comparative example. This is because the arrangement angles of the first and second magnets 14a and 14b for the A phase of the embodiment are deviated, and the arrangement angles of the first and second magnets 15a and 15b for the B phase are deviated. This is because the so-called skew effect, in which the change in the magnetic field becomes gentle for each phase, can be obtained. Further, as shown in FIG. 6B, the magnitude of the cogging torque T of the motor M of the present embodiment for each high-order component is particularly quaternary as compared with the cogging torque T1 of the motor M1 of the comparative example. It can be seen that the components are effectively kept small. As described above, the motor M of the present embodiment has a structure having an effect of reducing the cogging torque T.

Next, the characteristic effects of this embodiment will be described.
(1) The A-phase rotor portion 11 facing the A-phase stator portion 21 is provided with the A-phase first and second magnets 14a and 14b divided into two in the axial direction, and their arrangement angles are shifted from each other. The B-phase rotor portion 12 facing the B-phase stator portion 22 is also provided with the B-phase first and second magnets 15a and 15b separated in the axial direction, and their arrangement angles are shifted from each other. Therefore, the change in the magnetic field for each phase becomes gentle. As a result, the cogging torque T of the A-phase and B-phase motor units MA, MB, and eventually the motor M can be reduced. In particular, in the present embodiment, the fourth component of the cogging torque T can be effectively reduced.

(2) Since the widths of the magnets 14a, 14b, 15a, and 15b of each phase in the axial direction are the same, the magnetic balance of the A-phase and B-phase motor units MA, MB, and eventually the motor M can be improved.

(3) The A-phase and B-phase rotor portions 11 and 12 are displaced by the same predetermined electric angle (45 degrees in this embodiment) in the opposite directions to the A-phase and B-phase stator portions 21 and 22. The reference positions La and Lb are provided in, and the pair of magnets 14a and 14b and the magnets 15a and 15b of each phase are at half the electrical angle of each phase from the reference positions La and Lb on both sides (22.5 in this embodiment). Degree) is off. Therefore, the magnetic field changes of the magnets 14a, 14b, 15a, and 15b for each phase become gradual changes including the reference positions (appropriate positions) La and Lb, and the A-phase and B-phase motor units MA, MB, and eventually the motor M. The cogging torque T can be reduced more reliably.

The above embodiment may be changed as follows.
-In the above embodiment, the outer rotor type motor M is used, but it may be applied to the inner rotor type motor.

-In the above embodiment, the magnets 14a, 14b, 15a, 15b of the rotor 10 have 12 poles (6 pole pairs), and the claw-shaped magnetic poles 27, 28 of the stator 20 have 24 poles, but the number of poles is limited to this. Not done.

-In the A-phase and B-phase rotor portions 11 and 12 of the above embodiment, magnets 14a and 14b and magnets 15a and 15b divided into two in the axial direction are arranged in each phase, but each phase. 3 or more magnets may be arranged in. Further, the magnets of each phase may be divided into different numbers. Further, the magnets may be divided in the A-phase and B-phase rotor portions 11 and 12 so as to straddle both phases. Further, although the widths of the magnets 14a, 14b, 15a, and 15b in the axial direction are set to be equal, they may have different widths.

-Although the magnets 14a, 14b, 15a, and 15b of the above embodiment are not particularly mentioned, they may be composed of a plurality of magnets divided for each magnetic pole or each magnetic pole pair, or formed as one cylindrical magnet. It may be a magnet. Further, it may be attached to the rotor core 13 or may be integrally molded. Further, due to the positional relationship between the A-phase second magnet 14b and the B-phase first magnet 15a, an integral magnet may be used.

The electric angles θ1 and θ2 described in the above embodiment are set to 45 degrees, and the electric angles θ3 and θ4 are set to 22.5 degrees, but the angles are not limited thereto.
-The stator 20 of the above embodiment may be changed to the following configuration.

For example, in the stator 20a shown in FIGS. 7 (a) and 7 (b) and 8, the cooling performance is improved. First, the bobbin 25b used for the coil portion 25 is made of resin, and is formed in an annular shape having a substantially U-shaped cross section in the axial direction with the outer side in the radial direction open. The bobbin 25b has a U-shape with the upper side wall portion 31, the lower side wall portion 32, and the radial inner side wall portion 33, and the inner side surface 31a on the side where the upper side wall portion 31 and the lower side wall portion 32 come into contact with the winding 25a. , 32a are formed with grooves 31b and 32b forming a straight zigzag shape between the outer edge and the inner edge in the radial direction as they advance in the circumferential direction, respectively. A plurality of tubular portions 34 extending in the axial direction are formed on the inner side wall portion 33 in the radial direction at equal intervals in the circumferential direction. Each tubular portion 34 communicates with grooves 31b, 32b formed on the inner side surfaces 31a, 32a of the upper and lower side wall portions 31, 32 in the axial intermediate portion.

Further, each tubular portion 34 projects upward from the upper side wall portion 31 and downward from the lower side wall portion 32, respectively. Correspondingly, the first and second stator cores 23 and 24 are provided with fitting holes 23a and 24a and fitting recesses 23b and 24b into which the protruding portions of the tubular portions 34 are fitted. Such bobbins 25b and the first and second stator cores 23 and 24 are used for both the A-phase and B-phase stator portions 21 and 22. Further, the tubular portions 34 of the bobbins 25b used for each phase are configured so that their circumferential positions overlap, and the inner space of each tubular portion 34 connected in the axial direction communicates in the axial direction. It has become.

Then, the heat generated by energization of the winding 25a or the like is discharged radially outward through the grooves 31b and 32b, or moves radially inward through the grooves 31b and 32b and passes through the tubular portion 34 in the axial direction. It is discharged, so that the heat generated by the stator 20a is effectively cooled. The tubular portion 34 and the grooves 31b and 32b may be provided in only one of them.

Further, by fitting the end portion of the tubular portion 34 with the fitting holes 23a, 24a and the fitting recesses 23b, 24b of the stator cores 23, 24, the bobbin 25b (coil portion 25) is positioned with respect to the stator cores 23, 24. It also leads to improvement of fixing force. Further, the inner space of the tubular portion 34 can be used as a take-out path for the terminal line (not shown) of the winding 25a.

Next, instead of the vertically divided stator cores 23 and 24 as in the above embodiment, for example, the circumferentially divided stator cores 40 and 42 as shown in FIGS. 9A and 9B may be used. The stator core 40 shown in FIG. 9A is divided into four in the circumferential direction, and the stator core 42 shown in FIG. 9B is divided into two in the circumferential direction. The individual core parts 41 and 43 of the stator cores 40 and 42 have a shape in which parts of different magnetic poles are axially connected by a radial inner side wall portion. The core parts 41 and 43 can also be manufactured by a dust core. In this case, since the individual core parts 41 and 43 are small, the size of the press machine can be reduced, and the manufacturing cost can be expected to be reduced.

Further, as in the stator core 40a shown in FIG. 9C, a structure in which a gap 44 is set between the core parts 41a divided in the circumferential direction may be used. In this case, the end wire of the winding (both not shown) can be easily taken out from the gap 44, and the winding can be cooled by passing air through the gap 44. The stator cores 23 and 24 of the above-described embodiment, which have a continuous shape in the circumferential direction, may also be provided with a groove or the like extending in the radial direction on the outer surface to allow air to pass therethrough to improve the cooling performance.

Next, the inner peripheral surface 26a of the cylindrical portion 26 of the stator cores 23 and 24 of the above embodiment was formed linearly in the axial direction, but as in the stator core 45 shown in FIGS. The central portion of the inner peripheral surface 46a of the through hole 46 in the axial direction may be formed into an arc shape that is convex inward in the radial direction. In this case, when assembling the stator core, the arcuate inner peripheral surface 46a facilitates the adjustment of the inclination of the stator core. In this case, it becomes possible to appropriately face the magnet on the rotor side, and effects such as an increase in the effective magnetic flux amount and a reduction in the thrust force can be expected.

Next, the technical idea that can be grasped from the above embodiment and another example will be added below.
(A) The motor according to claim, wherein the stator is formed with an exhaust passage for discharging heat generated in the winding to the outside of the stator.

(B) The motor according to claim, wherein the stator core is composed of a plurality of core components divided in the circumferential direction.
(C) The motor according to claim, wherein the inner peripheral surface of the stator core is formed in an arc shape whose central portion in the axial direction is convex inward in the radial direction.

10 ... rotor, 11 ... A-phase rotor section, 12 ... B-phase rotor section, 14a ... A-phase first magnet, 14b ... A-phase second magnet, 15a ... B-phase first magnet, 15b ... B Second phase magnet, 20 ... stator, 21 ... A-phase stator part, 22 ... B-phase stator part, 23, 24 ... stator core, 27, 28 ... claw-shaped magnetic poles, 25 ... coil part, La, Lb ... reference position.

Claims (4)

The coil part is arranged between the pair of stator cores having a plurality of claw-shaped magnetic poles at equal angle intervals, while the coil part is arranged between the pair of stator cores having a plurality of claw-shaped magnetic poles at equal angle intervals. A two-phase stator in which the B-phase stator portions are arranged side by side in the axial direction with a predetermined electrical angle shift.
A motor including a rotor having a permanent magnet facing the claw-shaped magnetic poles of the A-phase and B-phase stator portions.
The rotor is a two-phase rotor in which an A-phase rotor portion facing the A-phase stator portion and a B-phase rotor portion facing the B-phase stator portion are arranged side by side in the axial direction. ,
The permanent magnets of the A-phase and B-phase rotor portions are configured to be divided into two or more in each phase in the axial direction, and in each phase, the permanent magnets of the divided permanent magnets are formed. At least two are configured by shifting the arrangement angles, and the directions of shifting the arrangement angles are the same in the A-phase rotor portion and the B-phase rotor portion when viewed in the axial direction, and The direction is the same as the direction in which the B-phase rotor portion is displaced with respect to the A-phase rotor portion.
When the direction of shifting the arrangement angle is set to the shifting direction, in the two permanent magnets axially adjacent to each other between the A-phase rotor portion and the B-phase rotor portion, the B-phase of the two permanent magnets is used. to the rotor side of the permanent magnets a-phase rotor portion side of the permanent magnets, the arrangement angle is arranged to have the same position, without Oite displacement Tei in both of the shifting direction and its opposite direction A motor characterized by. In the motor according to claim 1,
The A-phase rotor unit, two of the permanent magnets arrangement angle are different from each other is not more that are juxtaposed in the axial direction,
Motor, wherein the B-phase rotor unit is for two of the permanent magnets arrangement angle are different from each other are juxtaposed in the axial direction. In the motor according to claim 2,
A motor characterized in that each permanent magnet provided in the A-phase and B-phase rotor portions has an equal width in the axial direction. In the motor according to claim 2 or 3.
The A-phase and B-phase rotor portions have an electric angle equal to the mutual displacement angle of the A-phase and B-phase stator portions, and the directions between the phases are opposite to those of the A-phase and B-phase stator portions. It has a reference position at a position shifted to, and is characterized in that the pair of permanent magnets of each phase are arranged on both sides from the reference position of each phase by an angle of half of the electric angle. motor.

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