Motor-driving apparatus

Patent metadata

Field	Value
Publication number	US-2021305928-A1
Application number	US-202017086614-A
Country	US
Kind code	A1
Filing date	Nov 2, 2020
Priority date	Mar 30, 2020
Publication date	Sep 30, 2021
Grant date	—

Abstract

A motor-driving apparatus for driving a motor having a plurality of windings respectively corresponding to a plurality of phases is provided. The motor-driving apparatus includes a first inverter having a plurality of first switching devices and connected to first ends of the plurality of windings and a second inverter having a plurality of second switching devices and connected to second ends of the plurality of windings. A third switching device is configured to selectively connect and disconnect points at which a number of turns of each of the windings is divided in a preset ratio. A controller is configured to adjust an on/off state of the first to third switching devices based on required output of the motor.

First claim

1 . A motor-driving apparatus for driving a motor having a plurality of windings corresponding to a plurality of phases, respectively, comprising:
a first inverter including a plurality of first switching devices and connected to first ends of the plurality of windings; a second inverter including a plurality of second switching devices and connected to second ends of the plurality of windings; a third switching device configured to selectively connect and disconnect points at which a number of turns of each of the windings is divided in a preset ratio; and a controller configured to adjust an on/off state of the first to third switching devices based on a required output of the motor.

2 . The motor-driving apparatus of claim 1 , wherein the third switching device includes a plurality of switching devices having first-side ends connected to points at which a number of turns of each of the plurality of windings is divided in the preset ratio, respectively, and the second-side ends connected to each other.

3 . The motor-driving apparatus of claim 1 , wherein, when the required output of the motor is less than a preset reference value, the controller is configured to turn on the third switching device and drive the motor by performing pulse-width modulation control on the first switching device.

4 . The motor-driving apparatus of claim 3 , wherein the preset ratio is N 1 :N 2 , and a coil with a number of turns corresponding to the N 1 is connected to the first inverter in a form of a Y-connection by turning on the third switching device.

5 . The motor-driving apparatus of claim 4 , wherein the N 1 is determined to make a region corresponding to a main driving point of a vehicle to which the motor is applied belong to a region in which a voltage utilization rate of the inverter is equal to or greater than a preset reference value, at which the voltage utilization rate of the inverter is determined to be optimized, in a motor-revolutions-per-minute (RPM)/motor-torque relationship.

6 . The motor-driving apparatus of claim 1 , wherein, when the required output of the motor is greater than a preset reference value, the controller is configured to turn off the third switching device and drive the motor by performing pulse-width modulation control on the first switching device and the second switching device.

7 . The motor-driving apparatus of claim 6 , wherein the preset ratio is N 1 :N 2 , and opposite ends of a coil having a number of turns corresponding to N 1 +N 2 are connected to the first and second inverters by turning off the third switching device, and the motor is driven as an open-end winding motor.

8 . A motor-driving apparatus for driving a motor having a plurality of windings corresponding to a plurality of phases, respectively, comprising:
a first inverter including a plurality of first switching devices and connected to first ends of the plurality of windings; a second inverter including a plurality of second switching devices and connected to second ends of the plurality of windings; a plurality of third switching devices having first-side ends connected to points at which a number of turns of the plurality of windings is divided in a preset ratio, respectively, and having second-side ends connected to each other; and a controller configured to form a Y-connection by turning on the plurality of third switching devices and to drive the motor by performing pulse-width modulation control on the plurality of first switching devices when a required output of the motor is less than a preset reference value, and to turn off the third switching device and to drive the motor as an open-end winding motor by performing pulse-width modulation control on the first and second switching devices when the required output of the motor is equal to or greater than the reference value.

9 . The motor-driving apparatus of claim 8 , wherein the preset ratio is N 1 :N 2 , and a coil having a number of turns corresponding to the N 1 is connected to the first inverter in a form of a Y-connection by turning on the third switching device.

10 . The motor-driving apparatus of claim 9 , wherein the N 1 is determined to make a region corresponding to a main driving point of a vehicle to which the motor is applied belong to a region in which a voltage utilization rate of the inverter is equal to or greater than a preset reference value, at which the voltage utilization rate of the inverter is determined to be optimized, in a motor-revolutions-per-minute (RPM)/motor-torque relationship.

11 . The motor-driving apparatus of claim 8 , wherein the preset ratio is N 1 :N 2 , and opposite ends of a coil having a number of turns corresponding to N 1 +N 2 are connected to the first and second inverters by turning off the third switching device, and the motor is driven as an open-end winding motor.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Jeong Kang Ho
• Lim Jong Kyong
• Lim Suk Hyun
• Jang Ji Woong
• Kim Beom Sik
• Shin Sang Cheol

Classifications

• H02P2207/07

  Doubly fed machines receiving two supplies both on the stator only wherein the power supply is fed to different sets of stator windings or to rotor and stator windings · CPC title

• H02P27/08 Primary

  with pulse width modulation · CPC title

• H02P23/0027

  using different modes of control depending on a parameter, e.g. the speed · CPC title

• H02P25/184 Primary

  wherein the motor speed is changed by switching from a delta to a star, e.g. wye, connection of its windings, or vice versa · CPC title

• H02P27/085

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title