Motor device

Patent metadata

Field	Value
Publication number	US-2020406761-A1
Application number	US-202016843652-A
Country	US
Kind code	A1
Filing date	Apr 8, 2020
Priority date	Jun 26, 2019
Publication date	Dec 31, 2020
Grant date	—

Abstract

A motor device for a vehicle includes a stator, a rotor, a bearing, an inverter, and a controller. The stator is attached into a housing and includes a concentrated winding coil. The rotor includes a permanent magnet. The bearing supports a rotating shaft of the rotor. The inverter controls an energization state of the concentrated winding coil. If a rotational speed of the rotor is greater than a threshold, the controller outputs a control signal to the inverter to execute field weakening control, and thereby makes a potential difference between the housing and the rotating shaft lower than a withstand voltage of the bearing. The control signal controls the energization state of the concentrated winding coil. The field weakening control generates magnetic flux of the concentrated winding coil in a direction of weakening magnetic flux of the permanent magnet.

First claim

1 . A motor device to be installed in a vehicle,
the motor device comprising: a stator attached into a housing and including a concentrated winding coil; a rotor accommodated in a middle of the stator and including a permanent magnet; a bearing attached to the housing and supporting a rotating shaft of the rotor; an inverter provided between the stator and a power storage unit and configured to control an energization state of the concentrated winding coil; and a controller configured to, in a case where a rotational speed of the rotor is greater than a threshold, output a control signal to the inverter to execute field weakening control, and thereby to make a potential difference between the housing and the rotating shaft lower than a withstand voltage of the bearing, the control signal being configured to control the energization state of the concentrated winding coil, the field weakening control being configured to generate magnetic flux of the concentrated winding coil in a direction of weakening magnetic flux of the permanent magnet.

2 . The motor device according to claim 1 , wherein the threshold decreases as motor torque increases.

3 . The motor device according to claim 1 , wherein the threshold decreases as acceleration of the vehicle increases.

4 . The motor device according to claim 2 , wherein the threshold decreases as acceleration of the vehicle increases.

5 . The motor device according to claim 1 , wherein the threshold decreases as deceleration of the vehicle increases.

6 . The motor device according to claim 2 , wherein the threshold decreases as deceleration of the vehicle increases.

7 . The motor device according to claim 3 , wherein the threshold decreases as deceleration of the vehicle increases.

8 . The motor device according to claim 4 , wherein the threshold decreases as deceleration of the vehicle increases.

9 . The motor device according to claim 3 , wherein the rotating shaft has an axial direction that is a longitudinal direction of the vehicle.

10 . The motor device according to claim 4 , wherein the rotating shaft has an axial direction that is a longitudinal direction of the vehicle.

11 . The motor device according to claim 5 , wherein the rotating shaft has an axial direction that is a longitudinal direction of the vehicle.

12 . The motor device according to claim 6 , wherein the rotating shaft has an axial direction that is a longitudinal direction of the vehicle.

13 . The motor device according to claim 7 , wherein the rotating shaft has an axial direction that is a longitudinal direction of the vehicle.

14 . The motor device according to claim 8 , wherein the rotating shaft has an axial direction that is a longitudinal direction of the vehicle.

Assignees

• Subaru Corp

Inventors

• Hanaoka Masatoshi
• Katsume Akihito
• Morimoto Seiya

Classifications

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• H02P23/009

  using field weakening · CPC title

• B60L15/20 Primary

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• B60L3/0061

  relating to electrical machines · CPC title

• B60L2240/423

  Torque · CPC title