JP4868290B2 - Double stator in-wheel motor - Google Patents

Description

  The present invention relates to a double stator in-wheel motor.

  As a type of in-wheel motor, Japanese Patent No. 3596230 discloses a motor housing fixed to a wheel and connected to a vehicle suspension device, and a wheel shaft rotatably incorporated in the motor housing via a bearing portion. An in-wheel motor including a rotor coupled to rotate integrally with the wheel shaft and a stator fixed to a motor housing so as to be located on the inner side in the rotational radial direction with respect to the rotor is disclosed.

  A plurality of permanent magnets are arranged and fixed along the circumferential direction on the circumferential surface of the rotor in the in-wheel motor. On the other hand, the stator is provided with teeth made of a plurality of magnetic bodies arranged radially around the wheel shaft, and a coil is wound around each tooth. Each tooth is arranged close to the permanent magnet of the rotor.

This stator is formed with a phase-opening part with teeth removed over an angular range of about 180 degrees centered on the wheel shaft, and a double-wishbone suspension lower ball joint that connects the vehicle body and housing to the phase-opening part. It is arranged.
Japanese Patent No. 3596230

  According to the above-described conventional in-wheel motor, the stator is formed with an open phase portion where no teeth are present, and the lower ball joint is disposed in the open phase portion, so that the lower ball joint can be arranged inside the wheel. For this reason, the operability and running stability of the vehicle are improved.

However, the phase loss portion does not contribute to torque generation because the teeth around which the coil is wound are omitted and no coil is present. In the conventional in-wheel motor described above, the phase loss portion that does not contribute to the torque generation is formed over an angle range of about 180 degrees, so it is difficult to obtain a large torque. In addition, since a phase loss portion that does not contribute to torque generation and a portion where torque is generated by providing a tooth around which a coil is wound are mixed, vibration is likely to occur during acceleration or deceleration.
The present invention has been made in view of such problems, and an object thereof is to provide an in-wheel motor that can improve operability and stability of a vehicle, obtain a large torque, and suppress vibrations.

  In order to achieve the above object, a first aspect of the present invention is directed to a motor housing coupled to a vehicle suspension, a wheel shaft rotatably incorporated in the motor housing via a bearing, and coupled to the wheel shaft. A wheel, a rotor built in the motor housing and connected to rotate integrally with the wheel shaft, an outer stator fixed inside the housing so as to be located on the outer side in the rotational radial direction with respect to the rotor, and the rotor An inner stator fixed to the inside of the motor housing so as to be positioned on the inner side in the rotational radial direction, the rotor having a plurality of permanent magnets arranged and fixed along the circumferential direction on the peripheral surface thereof, Teeth composed of a plurality of magnetic bodies arranged radially around the wheel shaft; The outer stator has a plurality of magnetic teeth arranged radially around the wheel shaft, and a coil wound around each of the teeth. A double stator type in-wheel motor in which the teeth of each of the teeth and the teeth of the outer stator are disposed close to each other, and the teeth are omitted over a predetermined angle range centered on the wheel shaft in either the inner stator or the outer stator. The phase-opening portion is partitioned and a connection point between the suspension device and the motor housing is provided in the phase-missing portion.

  According to a second aspect of the present invention, in the double stator type in-wheel motor according to the first aspect, the phase loss portion is partitioned into a plurality of locations, and the phase loss portions of the plurality of locations are arranged around the rotation center of the rotor. It is characterized by being arranged substantially symmetrically with respect to a straight line passing through in the radial direction.

  According to a third aspect of the present invention, there is provided a motor housing coupled to a vehicle suspension device, a wheel shaft rotatably incorporated in the motor housing via a bearing portion, a wheel coupled to the wheel shaft, and a motor housing. A rotor built in and connected to the wheel shaft so as to rotate integrally, an outer stator fixed inside the housing so as to be located on the outer side in the rotational radius with respect to the rotor, and on an inner side in the rotational radius with respect to the rotor An inner stator fixed inside the motor housing so as to be positioned, and a plurality of permanent magnets arranged in a row along the circumferential direction of the rotor, and the inner stator is centered on the wheel shaft Teeth made of a plurality of magnetic materials arranged radially and a coil wound around each tooth The outer stator includes teeth made of a plurality of magnetic bodies arranged radially around the wheel shaft and coils wound around the teeth, and the inner stator teeth and outer coils are attached to the permanent magnet of the rotor. A double stator type in-wheel motor in which the teeth of the stator are arranged close to each other, wherein the inner stator is formed with a phase-separated portion in which the teeth are removed over a predetermined angle range centered on the wheel shaft, and the wheel shaft is formed on the outer stator. A phase-opening portion in which the teeth are removed over a predetermined angle range centered on the center, and the predetermined angle range of the open-phase portion of the inner stator and the predetermined angle range of the open-phase portion of the outer stator are not overlapped, A connection point between the suspension device and the motor housing is provided at the phase loss part. To.

  According to a fourth aspect of the present invention, in the double stator type in-wheel motor according to the third aspect, the phase failure portion of the inner stator and the phase loss portion of the outer stator extend radially through the rotation center of the rotor. It arrange | positions substantially symmetrically about the straight line, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, the phase loss portion in which the teeth are removed is provided in either the inner stator or the outer stator, and the connection point between the suspension device and the motor housing is provided in the phase loss portion. Since it comprised so that a connection point may be installed in the inside of a wheel. Therefore, the controllability and running stability of the vehicle can be improved.

  In addition, a double stator type motor is adopted as the in-wheel motor, and the phase loss portion is formed only in one of the inner stator and the outer stator. Therefore, when the phase loss portion is formed in the inner stator, this phase loss The coil missing at the outer stator can be supplemented by the coil wound around the teeth of the outer stator, and when the outer stator is formed with a missing phase, the missing coil is wound around the inner stator teeth. Can be complemented with a coil. For this reason, since the teeth of the stator are removed, it is possible to suppress the decrease in torque and the occurrence of vibration due to the formation of a phase loss portion that does not exist in the coil and does not contribute to torque generation.

  According to the second aspect of the present invention, the missing phase portions are provided at a plurality of locations, so that the connection points between the suspension device and the motor housing can be arranged at the missing phase portions. Therefore, the controllability and running stability of the vehicle can be further improved.

  In addition, since the plurality of phase-loss portions are arranged in a substantially line symmetrical manner in a well-balanced manner, the occurrence of vibration due to the presence of the phase-loss portions can be further suppressed.

  According to the third aspect of the present invention, since the phase loss portion is provided in both the inner stator and the outer stator, the suspension device and the motor housing are connected to the phase loss portion of the inner stator and / or the phase loss portion of the outer stator. Points can be arranged. Therefore, since the connection point can be installed inside the wheel, it is possible to improve the maneuverability and running stability of the vehicle.

  In addition, since the angle range in which the phase loss portion of the inner stator is formed does not overlap with the angle range in which the phase loss portion of the outer stator is formed, the absence of the coil at the phase loss portion of the inner stator is wound around the teeth of the outer stator. Coil can be complemented by the coil, and the lack of the coil at the phase failure portion of the outer stator can be complemented by the coil wound around the teeth of the inner stator. Therefore, it is possible to suppress a decrease in torque and occurrence of vibration due to the formation of the open phase portion.

  According to the fourth aspect of the present invention, since the plurality of phase loss portions are arranged in substantially line symmetry, the occurrence of vibration due to the presence of the phase loss portions can be further suppressed.

  The present invention will be described below with reference to the accompanying drawings. 1 is a cross-sectional view showing a double stator type in-wheel motor according to an embodiment of the present invention, FIG. 2 is an end view taken along line 2-2 of FIG. 1, and FIG. 3 is cut along line 3-3 of FIG. It is sectional drawing.

The double stator motor 10 includes a motor housing 20 and a wheel shaft 30. The wheel shaft 30 passes through the motor housing 20, and a wheel 40 is connected to a hub 31 integrally formed at one end protruding from the housing 20 by a hub stud bolt 41.

  The motor housing 20 includes an outer housing 21 whose inner end surface is an opening 21a, and an inner housing 22 that covers the inner end surface opening 21a of the outer housing 21, and the inner housing 22 is fixed to the outer housing 21 with bolts (not shown). . The inner housing 22 is connected to an upper arm 80 and a lower arm 90 of a double wishbone type suspension that is a kind of a vehicle suspension device.

  The outer housing 21 is formed with a through hole 21b at the center thereof. Further, the inner housing 22 has a cylindrical portion 22a projecting inside the center portion. The wheel shaft 30 is inserted into the cylindrical portion 22 a of the inner housing 22 from the through hole 21 b of the outer housing 21.

  The housing 20 includes a rotor 50, a pair of ball bearings 32 and 33 that rotatably support the rotor 50, an inner stator 60, and an outer stator 70.

  The rotor 50 includes a bottomed short cylindrical rotor main body 51 and a cylindrical shaft portion 53 that is integrally projected at the center of the bottom surface 52 of the rotor main body 51. The rotor body 51 has a circumferential surface 54 having a circular cross section, and a plurality of through holes 55 penetrating the inside and outside of the rotor 50 are arranged at equal intervals along the circumferential direction. A rectangular flat permanent magnet 56 is fitted in each through hole 55.

  Both ball bearings 32 and 33 are mounted on the inner wall surface of the cylindrical portion 22 a of the inner housing 22. The cylindrical shaft portion 53 of the rotor 50 is rotatably supported by the inner housing 22 by ball bearings 32 and 33. A fine nut 33 is fastened to the cylindrical shaft portion 53, and the ball bearings 32 and 33 are prevented from coming off from the cylindrical shaft portion 53.

  The wheel shaft 30 is inserted into the cylindrical shaft portion 53 of the rotor 50 rotatably incorporated in the housing 20 by the ball bearings 32 and 33, and the cylindrical shaft portion 53 and the wheel shaft 30 are serrated and coupled so as to rotate integrally. Yes. Thus, the rotor 50 and the wheel shaft 30 are rotatably incorporated in the housing 20 by the common ball bearings 32 and 33.

  As shown in FIGS. 2 and 3, the inner stator 60 is disposed on the inner side in the rotational radial direction with respect to the rotor 50, and the outer stator 70 is disposed on the outer side in the rotational radial direction. The inner stator 60 is made of a substantially disk-shaped magnetic body, and a circular through hole 61 is formed at the center, and a plurality of teeth 62 are radially arranged around the through hole 61 at the outer periphery. A coil 63 is wound around 62.

  A total of 24 teeth 62 of the inner stator 60 are arranged at equal angular intervals. The teeth 62 are provided not on the entire circumference of the inner stator 60 but on a part thereof. A predetermined angle range θ <b> 1 centered on the through hole 61 is formed as an open phase portion 60 a from which the teeth 62 are omitted.

  FIG. 2 shows the missing tooth 64 in the phase loss portion 60a by a two-dot chain line. The angular interval between adjacent teeth 62 is set so that the number of teeth 62 is 27 when the teeth 62 are arranged along the entire circumference of the inner stator 60. The phase loss part 60 a is set to an angle range θ <b> 1 corresponding to three teeth 64. That is, in the open phase portion 60a, the three teeth 64 and the coil 63 wound around each of the teeth 64 are omitted, and a space having a width corresponding to the three teeth 64 is defined.

  The inner stator 60 is attached to the cylindrical portion 22 a by inserting the through hole 61 into the outer peripheral portion of the cylindrical portion 22 a of the inner housing 22, and is fixed to the inner housing 22 with a bolt 25. Each tooth 62 of the inner stator 60 attached to the cylindrical portion 22 a extends radially around the wheel shaft 30, and the front end surface thereof is disposed close to the permanent magnet 56 fixed to the rotor 50.

  The outer stator 70 is made of a substantially ring-shaped magnetic body with a part cut away, and a total of 21 teeth 71 are arranged at equal angular intervals on the inner peripheral surface, and a coil 72 is wound around each tooth 71. . The teeth 71 are provided not on the entire circumference of the outer stator 70 but partially. A predetermined angle range θ <b> 2 centered on the through hole 61 is formed as an open phase portion 70 a from which the teeth 71 are omitted. In FIG. 2, the missing tooth 73 in the phase loss part 70 a is illustrated by a two-dot chain line. The angular interval between adjacent teeth 71 is set so that the number of teeth 72 is 27 when the teeth 72 are arranged along the entire circumference of the outer stator 70. The phase loss part 70 a is set to an angle range θ <b> 2 for six teeth 73. That is, in the phase loss portion 70a, the six teeth 63 and the coil 72 wound around each of the teeth 63 are omitted, and a space having a width corresponding to the six teeth 63 is defined.

  The outer stator 70 has curved convex portions 74 arranged in a row at the same equiangular interval as the teeth 71 on the outer peripheral portion. On the other hand, the curved concave portions 21c into which the curved convex portions 74 are fitted are formed in a circle on the inner wall surface of the outer housing 21. The outer stator 70 is fixed to the outer housing 21 by fitting the curved convex portion 74 to the curved concave portion 21c of the outer housing 21 and bonding with an adhesive.

  The teeth 71 of the outer stator 70 fixed to the outer housing 21 are substantially aligned with the teeth 62 of the inner stator 60 and are arranged radially around the wheel shaft 30, and the tip surfaces of the teeth 71 are permanent magnets of the rotor 50. Closely arranged in 56 rows.

  The inner stator 60 and the outer stator 70 are attached so that the phase loss portion 60 a of the inner stator 60 is located at the lower portion of the motor housing 20 and the phase loss portion 70 a of the outer stator 70 is located at the upper portion of the motor housing 20. . A predetermined angle range θ1 centered on the wheel shaft 30 in which the phase loss portion 60a of the inner stator 60 is defined and a predetermined angle centered on the wheel shaft 30 in which the phase loss portion 70a of the outer stator 70 is defined. The open phase portions 60a and 70a are arranged so that the angle range θ2 does not overlap. Further, the phase loss portion 60 a of the inner stator 60 and the phase loss portion 70 a of the outer stator 70 are arranged so as to be substantially line symmetric with respect to a straight line O extending in the radial direction of the rotor 50 through the rotation center of the rotor 50. .

  FIG. 4 is a connection circuit diagram of coils 63 and 72 wound around the teeth 62 and 71 of the inner stator 60 and the outer stator 70. The connection configuration consists of three phases, U, V, and W. Each phase consists of the first, second, and third blocks, and the first, second, and third blocks are connected in parallel. Yes. In the case where the phase loss portion is not formed, each block has a first coil wound around the teeth 71 of the outer stator 70, a second coil, a third coil, a fourth coil wound around the teeth 62 of the inner stator 60, and a first coil. Each of the 5 coils and the 6th coil is connected in series.

In the present embodiment, as described above, the six coils 72 are omitted from the outer stator 70 and the three coils 63 are omitted from the inner stator 60. The missing coil is shown by a two-dot chain line in FIG. In the U phase, the first coil of the first block, the third coil of the second block, and the sixth coil of the third block are omitted. In the V phase, the third coil of the first block, the sixth coil of the second block, and the third coil of the third block are omitted. In the W phase, the sixth coil of the first block, the third coil of the second block, and the third coil of the third block are omitted.
According to this connection circuit, since the combined resistance in each phase U, V, W is the same, as a method for controlling the current for driving the motor, before the coils 63, 72 are removed, that is, the coil indicated by the two-dot chain line The control method in the case of adopting a connection circuit including can be used as it is.

  Returning to FIG. 1, a bracket 82 having a ball 81 is fixed to the upper outer side of the outer housing 21 with a bolt 83. On the other hand, a socket 84 is integrally formed at the tip of the upper arm 80 constituting the double wishbone suspension. The ball 81 and the socket 84 constitute an upper ball joint 85 that connects the motor housing 20 and the upper arm 80, and the motor housing 20 is connected to a vehicle body (not shown) via the upper arm 84 and the upper ball joint 85. The upper ball joint 85 is installed in a space defined as a phase-loss portion 70 a of the outer stator 70.

  A recess 22b is defined on the outer side of the lower portion of the inner housing 22, and a pair of upper and lower sockets 91 are fixed to the recess 22b. On the other hand, a ball 92 is integrally formed at the tip of the lower arm 90 of the double wishbone suspension. The socket 91 and the ball 92 constitute a lower ball joint 93 that connects the motor housing 20 and the lower arm 90, and the motor housing 20 is connected to a vehicle body (not shown) via the lower arm 90 and the lower ball joint 93. The recess 22b is provided in a space defined as a phase-opening portion 60a of the inner stator 60, and a lower ball joint 93 is installed in the recess 22b.

  As shown in FIG. 1, a straight line L connecting the upper ball joint 85 and the lower ball joint 93 is located inside the wheel 40, and this straight line L becomes a rotation axis during steering.

  According to the double stator in-wheel motor 10 according to the present embodiment, both the inner stator 60 and the outer stator 70 are provided with the missing phase portions 60a and 70a in which the teeth 62 and 71 are missing, By disposing ball joints 85 and 93 serving as connection points between the arms 80 and 90 of the double wishbone suspension and the motor housing 20 at the phase loss portion 70 a of the outer stator 70, the ball joints 85 and 93 are connected to the wheel 40. Since it is installed inside, the controllability and running stability of the vehicle can be improved.

  Further, since the angle range θ1 in which the phase loss portion 60a of the inner stator 60 is formed does not overlap with the angle range θ2 in which the phase loss portion 70a of the outer stator 70 is formed, the lack of the coil 63 in the phase loss portion 60 of the inner stator 60 is prevented. The coil 72 wound around the teeth 71 of the outer stator 70 can be supplemented, and the lack of the coil 72 in the phase-loss portion 70 of the outer stator 70 can be supplemented by the coil 63 of the inner stator 60. For this reason, it is possible to suppress a decrease in torque and occurrence of vibration due to the formation of the open phase portions 60a and 70a.

  Furthermore, since the phase loss portion 70a of the outer stator 70 and the phase loss portion 60a of the inner stator 60 are arranged symmetrically, the occurrence of vibration due to the presence of the phase loss portions 60a, 70a can be further suppressed.

  In this embodiment, the phase loss portion 70a is formed in the upper portion of the outer stator 70, the phase loss portion 60a is formed in the lower portion of the inner stator 60, and the phase loss portions 60a and 70a are arranged symmetrically. The formation place and arrangement | positioning of the parts 60a and 70a are not limited to this. Hereinafter, other examples of the location and arrangement of the phase loss part are shown in FIGS. 5 to 8, the rotor 50 and the motor housing 20 are omitted, and only the outer stator 70 and the inner stator 60 are shown.

  In the embodiment shown in FIG. 5A, the phase loss portion 60 a for three teeth is formed only on the inner stator 60, and the phase loss portion is not formed on the outer stator 70. In the embodiment (B) shown in FIG. 5B, the phase loss portion for three teeth is formed on the upper portion of the outer stator 70, and the phase loss portion is not formed on the inner stator 60. In the embodiment shown in FIG. 5C, the phase loss portions 60a and 60b corresponding to three teeth are formed at two locations above and below the inner stator 60. Then, the phase of the other phase missing portion 60 b is arranged symmetrically with respect to one phase missing portion 60 a with respect to a straight line O extending in the radial direction through the rotation center of the rotor 50. In the embodiment shown in FIG. 5D, open phase portions 70a and 70b for three teeth are formed at two locations above and below the outer stator 70. Then, the phase of the other phase missing portion 70b is arranged symmetrically with respect to the straight line O with respect to the one phase missing portion 70a.

  In the embodiment shown in FIG. 5, only one of the inner stator 60 and the outer stator 70 is provided with the phase loss portion. However, in the embodiment shown in FIG. 6, the phase loss portion is provided in each of the inner stator 60 and the outer stator 70. Is provided. In the embodiment shown in FIG. 6A, the phase loss portion 70 a for three teeth is formed on the upper portion of the outer stator 70, and the phase loss portion 60 a for six teeth is formed on the lower portion of the inner stator 60. In the embodiment shown in FIG. 6B, the phase loss portion 70 a for three teeth is formed on the upper portion of the outer stator 70, and the phase loss portion 60 a for the main text of the teeth 3 is formed on the lower portion of the inner stator 60. In the embodiment shown in FIG. 6C, the phase loss portion 60 a for three teeth is formed on the upper portion of the inner stator 60, and the phase loss portion 70 a for six teeth is formed on the lower portion of the outer stator 70. In the embodiment shown in FIG. 6, the phase loss portions 60 a and 70 a are arranged symmetrically with respect to the straight line O.

  Although FIG. 6 shows an example in which the phase loss portions 60a and 70a are provided at two locations, the location where the phase loss portions are formed is not limited to two. FIG. 7 shows an embodiment in which open phase portions are provided at three locations. In the embodiment shown in FIG. 7A, a phase loss portion 70a corresponding to three teeth is formed at one upper portion of the outer stator 70, and a phase loss portion corresponding to three teeth is formed at two lower portions of the inner stator 60, respectively. 60a and 60b are formed. Then, the phase of the phase loss portions 60a and 60b of the inner stator 60 is shifted by about 120 degrees with respect to the phase loss portion 70a of the outer stator 70, and the phase loss portions 70a, 60a and 60b are arranged symmetrically with respect to the straight line O. . In the embodiment shown in FIG. 7B, a phase loss portion 60a corresponding to three teeth is formed in one upper portion of the inner stator 60, and a phase loss portion 70a corresponding to three teeth is formed in two lower portions of the outer stator 70, respectively. , 70b. Then, the phase of the phase loss portions 70 a and 70 b of the outer stator 70 is shifted by about 120 degrees with respect to the phase loss portion 60 a of the inner stator 60, and the phase is symmetrical with respect to the straight line O.

  In the embodiment described above with reference to FIGS. 5 to 7, the missing phase portion is arranged in line symmetry. However, it is also possible to arrange the missing phase portion asymmetrically as in the embodiment shown in FIG. 8. In the embodiment shown in FIG. 8A, a phase loss portion 60a corresponding to three teeth is formed in one upper portion of the inner stator 60, and a phase loss portion 70a corresponding to six teeth is formed in one location of the outer stator 70. is doing. The phase of the phase loss portion 70 a of the outer stator 70 is shifted by about 90 degrees with respect to the phase loss portion 60 a of the inner stator 60. Further, in the embodiment shown in FIG. 8B, a phase loss portion 70 a for three teeth is formed in one upper portion of the outer stator 70, and a phase loss portion 60 a for six teeth is formed in the inner stator 60. ing. The phase of the phase loss portion 60 a of the inner stator 60 is shifted by about 90 degrees with respect to the phase loss portion 70 a of the outer stator 70.

  In the embodiment shown in FIGS. 1 to 3, the ball joints 85 and 93 are arranged at two places on the upper and lower sides of the motor housing 20. However, as shown in the embodiments shown in FIGS. It is also possible to form ball joints at the respective open phases by forming the motor housing at two positions on the left and right sides. 5 to 8 exemplify various patterns related to the formation location and number of missing phase portions. In addition to the ball joints arranged in the missing phase portions thus formed, other components such as brakes are also provided. It is also possible to arrange a caliper part.

It is sectional drawing which shows the double stator type motor which concerns on the Example of this invention. It is the end elevation cut | disconnected from the 2-2 line | wire of FIG. It is sectional drawing cut | disconnected from the 3-3 line of FIG. FIG. 3 is a connection circuit diagram of a coil wound around teeth of an inner stator and an outer stator in a double stator motor according to an embodiment of the present invention. It is explanatory drawing which shows arrangement | positioning of the open phase part formed in the inner stator and outer stator in the motor. It is explanatory drawing which shows the through hole of a holder, a permanent magnet, and a rotor. It is explanatory drawing which shows other arrangement | positioning of the same phase loss part. It is explanatory drawing which shows other arrangement | positioning of the same phase loss part. It is explanatory drawing which shows other arrangement | positioning of the same phase loss part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Double stator type motor 20 ... Housing 21 ... Outer housing 22 ... Inner housing 30 ... Wheel shaft 40 ... Wheel 50 ... Rotor 56 ... Permanent magnet 60 ... Inner stator 60a, 60b ... Phase loss part 62 ... Teeth 63 ... Coil 70 ... Outer stator 70a, 70b ... Phase loss 71 ... Teeth 72 ... Coil 85 ... Upper ball joint 93 ... Lower ball joint

Claims (4)

A motor housing connected to a vehicle suspension system, a wheel shaft rotatably incorporated in the motor housing via a bearing, a wheel connected to the wheel shaft, and a motor housing built in to rotate integrally with the wheel shaft A rotor connected to the rotor, an outer stator fixed inside the housing so as to be positioned on the outer side in the rotational radius with respect to the rotor, and an inner side of the motor housing so as to be positioned on the inner side in the rotational radius with respect to the rotor. With a fixed inner stator,
A plurality of permanent magnets are arranged and fixed along the circumferential direction on the circumferential surface of the rotor,
The inner stator includes teeth made of a plurality of magnetic bodies arranged radially around the wheel shaft and coils wound around the teeth,
The outer stator includes teeth formed of a plurality of magnetic bodies arranged radially around the wheel shaft and a coil wound around each tooth,
A double stator type in-wheel motor in which the teeth of the inner stator and the teeth of the outer stator are arranged close to the permanent magnet of the rotor,
A phase missing portion in which teeth are removed over a predetermined angular range centered on the wheel shaft is defined in one of the inner stator and the outer stator, and a connection point between the suspension device and the motor housing is formed in the phase missing portion. A double stator in-wheel motor characterized by being provided.   2. The open phase portion is partitioned into a plurality of locations, and the open phase portions at the multiple locations are arranged substantially symmetrically with respect to a straight line extending in the radial direction through the rotation center of the rotor. The described double stator type in-wheel motor. A motor housing connected to a vehicle suspension system, a wheel shaft rotatably incorporated in the motor housing via a bearing, a wheel connected to the wheel shaft, and a motor housing built in to rotate integrally with the wheel shaft A rotor connected to the rotor, an outer stator fixed inside the housing so as to be positioned on the outer side in the rotational radius with respect to the rotor, and an inner side of the motor housing so as to be positioned on the inner side in the rotational radius with respect to the rotor. With a fixed inner stator,
A plurality of permanent magnets are arranged and fixed along the circumferential direction on the circumferential surface of the rotor,
The inner stator includes teeth made of a plurality of magnetic bodies arranged radially around the wheel shaft and coils wound around the teeth,
The outer stator includes teeth formed of a plurality of magnetic bodies arranged radially around the wheel shaft and a coil wound around each tooth,
A double stator type in-wheel motor in which the teeth of the inner stator and the teeth of the outer stator are arranged close to the permanent magnet of the rotor,
The inner stator is formed with a phase-separated portion in which teeth are removed over a predetermined angle range centered on the wheel shaft,
The outer stator is formed with a phase-separated portion in which teeth are removed over a predetermined angular range centered on the wheel shaft,
The predetermined angle range of the phase loss portion of the inner stator and the predetermined angle range of the phase loss portion of the outer stator are arranged so as not to overlap, and a connection point between the suspension device and the motor housing is provided in the phase loss portion. Double stator type in-wheel motor.   4. The double stator type according to claim 3, wherein the phase loss portion of the inner stator and the phase loss portion of the outer stator are disposed substantially line-symmetrically with respect to a straight line extending in the radial direction through the rotation center of the rotor. In-wheel motor.

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