CN-115378156-B - Motor with a motor housing having a motor housing with a motor housing

CN115378156BCN 115378156 BCN115378156 BCN 115378156BCN-115378156-B

Abstract

The motor includes a rotor fixed to a rotary shaft, a stator disposed around the rotor with a gap therebetween in a radial direction orthogonal to an axial direction of the rotary shaft, and a housing accommodating the rotor and the stator. The rotor has a plurality of rotor cores formed of a soft magnetic material, and a rotor fixing member that fixes the rotor cores. The stator includes a plurality of stator cores made of a soft magnetic material, a stator fixing member for fixing the stator cores, and coils wound around the respective stator cores. The rotor and the stator are respectively more than 2 groups and are laminated in the axial direction of the rotating shaft.

Inventors

TAKAZAWA MAYUMI
HAGA KAZUAKI
TAKAHASHI TOSHIMITSU
NOMURA TAKUYA
SANO SHINYA
YAGIFU YASUHIDE
TOMONAGA TAKESHI
Gao Majiudian
KANADA KEIU

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260508
Application Date: 20220516
Priority Date: 20210520

Claims (2)

1. An electric motor having a rotor fixed to a rotary shaft, and a stator disposed around the rotor with a gap therebetween in a radial direction orthogonal to an axial direction of the rotary shaft; The rotor has a plurality of 1 st winding cores formed by soft magnetic materials, and a rotor fixing part for fixing the 1 st winding cores; the stator comprises a plurality of 2 nd winding cores formed by soft magnetic materials, a stator fixing component for fixing the 2 nd winding cores, and coils wound on the 2 nd winding cores; The rotor and the stator are respectively more than 2 groups, are laminated in the axial direction of the rotating shaft, The 1 st winding core and the 2 nd winding core are configured such that the respective width directions are parallel to the axial direction of the rotating shaft; The number of the 1 st winding core and the number of the 2 nd winding cores are the same; when the number of winding cores 2 is set to Ns and the number of groups of the rotor and the stator is set to n, the energization of each group is switched such that the rotor of the 1 st group to the n-th group rotates 360 °/(ns×n) each time, The 2 nd winding cores of all groups are configured at the same position; In the initial position, the 1 st winding core of the 1 st group is disposed at a position rotated by 360 °/(ns×n) in a direction opposite to a rotation direction of the rotation shaft with respect to the 2 nd winding core of the 1 st group, and the 1 st winding cores of the 1 st to n groups are disposed at positions rotated by 360 °/(ns×n) one by one in a direction opposite to the rotation direction of the rotation shaft.
2. An electric motor according to claim 1, The 1 st winding cores of all groups are configured at the same position; In the initial position, the 2 nd winding cores of the 1 st group are disposed at positions rotated by 360 °/(ns×n) in the rotation direction of the rotation shaft with respect to the 1 st winding cores of the 1 st group, and the 2 nd winding cores of the 1 st to n th groups are disposed at positions rotated by 360 °/(ns×n) in the rotation direction of the rotation shaft one by one for each group.

Description

Motor with a motor housing having a motor housing with a motor housing Technical Field The present invention relates to an electric motor, and more particularly, to a radial gap type (RADIAL GAP-type motor) electric motor. Background As a radial gap type motor, for example, a motor described in japanese patent application laid-open No. 2004-343905 is known. The motor described in japanese patent application laid-open No. 2004-343905 is a so-called outer rotor type motor having a stator fixed to a rotary shaft and having a plurality of stator cores protruding in a direction away from the rotary shaft and coils wound around the respective stator cores, and a rotor provided so as to surround the stator in a radial direction orthogonal to the rotary shaft and having a plurality of rotor cores opposed to the stator cores. Disclosure of Invention However, since the outer rotor type motor has a structure in which the stator core and the coils are disposed inside the motor (i.e., on the side of the rotation axis), if the number of turns of the coils is increased to increase the output torque of the motor, the motor as a whole becomes large, and it is difficult to achieve downsizing. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor capable of improving output torque and achieving downsizing. The motor of the present invention comprises a rotor fixed to a rotary shaft, and a stator disposed around the rotor with a gap therebetween in a radial direction orthogonal to an axial direction of the rotary shaft, wherein the rotor comprises a plurality of 1 st winding cores formed of a soft magnetic material, and a rotor fixing member for fixing the 1 st winding cores, the stator comprises a plurality of 2 nd winding cores formed of a soft magnetic material, a stator fixing member for fixing the 2 nd winding cores, and coils wound around the 2 nd winding cores, and the rotor and the stator are respectively laminated in an axial direction of the rotary shaft in at least 2 groups. The motor of the present invention has a structure in which the stator having a plurality of the 2 nd winding cores and the coils wound around the 2 nd winding cores is disposed outside the rotor, so that the space for the coils can be easily secured to be larger than the conventional outer rotor type motor, and the number of turns of the coils can be increased. As a result, the output torque of the motor can be increased, and the motor can be miniaturized. Further, since the rotor and the stator are each 2 or more groups and are stacked in the axial direction of the rotary shaft, the output torque of the motor can be further improved as compared with the case where 1 rotor and 1 stator are provided. In the motor of the present invention, it is preferable that the 1 st winding core and the 2 nd winding core are arranged such that the respective width directions thereof are along the rotation direction of the rotor, and the 1 st winding core has a width larger than the 2 nd winding core. Thus, the space for the coil can be further increased, and therefore, the output torque of the motor can be further increased. In the motor according to the present invention, it is preferable that the 1 st winding core and the 2 nd winding core are arranged such that the respective width directions are parallel to the axial direction of the rotation shaft, that the 1 st winding core and the 2 nd winding core are the same in number, and that when the number of the 2 nd winding cores is Ns and the number of the rotor and the stator is n, the energization of each group is switched such that the rotor of the 1 st to n-th groups rotates 360 °/(ns×n) each time. Thus, the rotors can be continuously rotated, and the motor can be driven more smoothly. In the motor according to the present invention, it is preferable that the 2 nd winding cores of all groups are disposed at the same position, that in an initial position, the 1 st winding core of the 1 st group is disposed at a position rotated by 360 °/(ns×n) in a direction opposite to a rotation direction of the rotation shaft with respect to the 2 nd winding core of the 1 st group, and that the 1 st winding cores of the 1 st group to the n th group are disposed at positions rotated by 360 °/(ns×n) one by one in a direction opposite to the rotation direction of the rotation shaft. Thus, the rotors can be continuously rotated, and the motor can be driven more smoothly. In the motor according to the present invention, it is preferable that the 1 st winding cores of all groups are disposed at the same position, that in the initial position, the 2 nd winding cores of the 1 st group are disposed at positions rotated by 360 °/(ns×n) in the rotation direction of the rotation shaft with respect to the 1 st winding cores of the 1 st group, and that the 2 nd winding cores of the 1 st group to the n nd group are disposed at positions rotated by 360 °/