Motor driving system and method of controlling same

Patent metadata

Field	Value
Publication number	US-12227080-B2
Application number	US-202217869658-A
Country	US
Kind code	B2
Filing date	Jul 20, 2022
Priority date	Nov 18, 2021
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A motor driving system and a method of controlling same can protect a user by converting a driving mode into a dual inverter driving mode so that a vehicle can keep being driven when a transfer switching unit breaks down while the motor is operated in a Y-connection single inverter driving mode.

First claim

What is claimed is:

1. A motor driving system comprising:
a first inverter including a plurality of switching devices and connected to first ends of windings of a motor;
a second inverter including a plurality of switching devices and connected to second ends of the windings of the motor;
a transfer switching unit including a plurality of switching devices of which first ends are connected to the windings of the motor, respectively, and of which second ends are connected to each other between the first inverter and the second inverter; and
a controller configured to control the transfer switching unit to drive the motor in accordance with a single inverter driving mode that utilizes the first inverter and a dual inverter driving mode that utilizes the first inverter and the second inverter, and configured to turn off the transfer switching unit and drive the second inverter to convert a driving mode of the motor into the dual inverter driving mode when the transfer switching unit breaks down in the single inverter driving mode;
wherein the controller is configured to operate the motor in a Y-connection by turning on the transfer switching unit in the single inverter driving mode, and to operate the motor in open-end winding by turning off the transfer switching unit in the dual inverter driving mode.

2. The motor driving system of claim 1 , wherein the controller is configured to set torque limitation ranges as ranges of controllable torque, and to apply different torque limitation ranges to the singe inverter driving mode and the dual inverter driving mode.

3. The motor driving system of claim 2 , wherein the controller is configured to maintain the torque limitation range of the single inverter driving mode when converting the single inverter driving mode into the dual inverter driving mode due to the breakdown of the transfer switching unit.

4. The motor driving system of claim 1 , wherein the controller is configured to diagnose breakdown of the first inverter and the second inverter, and to convert the driving mode of the motor into the dual inverter driving mode when the transfer switching unit breaks down even though the first inverter and the second inverter are normal.

5. The motor driving system of claim 1 , wherein the controller is configured to output an inverter check request message when the transfer switching unit breaks down.

6. The motor driving system of claim 1 , wherein the switching devices of the transfer switching unit are mechanical relays.

7. The motor driving system of claim 1 , wherein the controller is configured to forcibly turn off the transfer switching unit when even any one of the switching devices of the transfer switching unit breaks down.

8. The motor driving system of claim 1 , wherein the controller is configured to convert the driving mode of the motor into the dual inverter driving mode without turning off the transfer switching unit when all of the switching devices of the transfer switching unit are off due to breakdown of the transfer switching unit.

9. A method of controlling a motor driving system that includes a first inverter, a second inverter, and a transfer switching unit and operates a motor into a single inverter driving mode that utilizes the first inverter or into a dual inverter driving mode that utilizes the first inverter and the second inverter, the method comprising:
determining, by a controller, whether a vehicle is driven in the single inverter driving mode;
diagnosing, by the controller, breakdown of the transfer switching unit;
turning off, by the controller, the transfer switching unit when the transfer switching unit breaks down; and
converting, by the controller, a driving mode of the motor into the dual inverter driving mode when the transfer switching unit is off;
wherein the controller is configured to operate the motor in a Y-connection by turning on the transfer switching unit in the single inverter driving mode, and to operate the motor in open-end winding by turning off the transfer switching unit in the dual inverter driving mode.

10. The method of claim 9 , further including:
setting, by the controller, torque limitation ranges as ranges of controllable torque, and applying, by the controller, different torque limitation ranges to the single inverter driving mode and the dual inverter driving mode.

11. The method of claim 10 , wherein the controller is configured to maintain the torque limitation range of the single inverter driving mode when converting the single inverter driving mode into the dual inverter driving mode due to the breakdown of the transfer switching unit in the applying of the torque limitation ranges.

12. The method of claim 9 , wherein the controller is configured to diagnose breakdown of the first inverter and the second inverter in the diagnosing of the breakdown of the transfer switching unit, and to convert the driving mode of the motor into the dual inverter driving mode when the first inverter and the second inverter are normal and the transfer switching unit breaks down.

13. The method of claim 9 , further including:
outputting, by the controller, an inverter check request message when the transfer switching unit breaks down.

14. The method of claim 9 , wherein the controller is configured to forcibly turn off the transfer switching unit when even any one of the switching devices of the transfer switching unit breaks down in the turning off of the transfer switching unit.

15. The method of claim 9 , wherein the switching devices of the transfer switching unit are mechanical relays.

16. The method of claim 9 , wherein the controller is configured to convert the driving mode of the motor into the dual inverter driving mode without turning off the transfer switching unit when all of the switching devices of the transfer switching unit are off due to the breakdown of the transfer switching unit.

17. A non-transitory computer readable storage medium on which a program for performing the method of claim 9 is recorded.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Bin Seung Hyeon
• Tak Byung Oh
• Lee Seon Mi
• Park Sang Woo

Classifications

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title

• H02P25/18

  with arrangements for switching the windings, e.g. with mechanical switches or relays · CPC title

• B60L2240/427

  Voltage · CPC title

• H02H7/0838

  with H-bridge circuit · CPC title