Motor driving apparatus

Patent metadata

Field	Value
Publication number	US-11784605-B2
Application number	US-202217889503-A
Country	US
Kind code	B2
Filing date	Aug 17, 2022
Priority date	Jan 11, 2022
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

A motor driving apparatus that drives a motor including a plurality of windings respectively corresponding to a plurality of phases, may include a first inverter including a plurality of first switching elements, and connected to a first end of each of the windings; a second inverter including a plurality of second switching elements, and connected to a second end of each of the windings; and a controller including a current controller to produce, based on a predetermined current command of the motor, a voltage command for determining a switching duty of the first switching elements and the second switching elements, wherein the current controller is configured to produce a zero-phase component voltage command among the voltage commands by applying 3 rd harmonic feedforward compensation.

First claim

What is claimed is:

1. A motor driving apparatus configured to drive a motor including a plurality of windings respectively corresponding to a plurality of phases, the motor driving apparatus comprising:
a first inverter including a plurality of first switching elements, and connected to a first end of each of the windings;
a second inverter including a plurality of second switching elements, and connected to a second end of each of the windings; and
a controller including a current controller configured to produce, based on a predetermined current command of the motor, a voltage command for determining a switching duty of the first switching elements and the second switching elements,
wherein the current controller is further configured to produce a zero-phase component voltage command among the voltage commands by applying 3 rd harmonic feedforward compensation.

2. The motor driving apparatus of claim 1 , wherein the current controller includes:
a first current controller configured to compare a zero-phase component current command of the motor and a zero-phase component current that flows through the motor, and to produce a zero-phase component voltage value to reduce an error therebetween;
a 3 rd harmonic calculator configured to determine a 3 rd harmonic component according to a rotation angle of the motor, a rotation speed of the motor, a magnitude of a zero-phase component magnetic flux of the motor, and a phase of the zero-phase component magnetic flux of the motor; and
a summing unit configured to produce the zero-phase component voltage command by adding the 3 rd harmonic component to the zero-phase component voltage value to reduce the error.

3. The motor driving apparatus of claim 2 , wherein the current controller further includes:
a second current controller configured to compare a dq-axes current command of the motor and a dq-axes current that flows through the motor, and to produce a dq-axes voltage command to reduce an error therebetween.

4. The motor driving apparatus of claim 2 , wherein the current controller further includes:
a first data map storing a predetermined magnitude of a zero-phase component magnetic flux of the motor corresponding to a d-axis current and a q-axis current of the motor; and
a second data map storing a predetermined phase of the zero-phase component magnetic flux of the motor corresponding to the d-axis current and the q-axis current of the motor.

5. The motor driving apparatus of claim 4 , wherein the first data map is configured to output, to the 3 rd harmonic calculator, a magnitude of a zero-phase component magnetic flux of the motor corresponding to a d-axis current command and a q-axis current command among current commands of the motor.

6. The motor driving apparatus of claim 4 , wherein the second data map is configured to output, to the 3 rd harmonic calculator, a phase of a zero-phase component magnetic flux of the motor corresponding to a d-axis current command and a q-axis current command among current commands of the motor.

7. The motor driving apparatus of claim 2 , wherein the 3 rd harmonic calculator is configured to determine the 3 rd harmonic component according to:
Equation′ V n,FF =3*ω r *λ n,amp *cos(3θ+λ n,phase )′ or

Equation′ V n,FF =3*ω r *λ n,amp *sin(3θ+λ n,phase )′

wherein V n,FF is the 3 rd harmonic component, ω r is the rotation speed of a rotor of the motor, θ is the rotation angle of the motor, λ n,amp : is the magnitude of the zero-phase component magnetic flux of the motor, and λ n,phase is the phase of the zero-phase component magnetic flux of the motor.

8. The motor driving apparatus of claim 2 , wherein the current controller includes a proportional resonant controller.

9. The motor driving apparatus of claim 1 , wherein the current controller includes:
a first current controller configured to compare a zero-phase component current command of the motor and a zero-phase component current that flows through the motor based on a triple speed synchronous reference frame, and to produce a zero-phase component voltage command to reduce an error therebetween; and
a second current controller configured to compare a dq-axes current command of the motor and a dq-axes current that flows through the motor, and to produce a dq-axes voltage command to reduce an error therebetween.

10. The motor driving apparatus of claim 9 , wherein the first current controller includes:
a zero-phase current extractor configured to extract a zero-phase component current obtained based on a three-phase current in a form of a DC via a triple angle-based rotational transform;
a controller configured to produce, based on a zero-phase component current command of the motor and the zero-phase component current extracted in the form of the DC, a voltage command to reduce an error; and
an inverse rotational transform unit configured to convert the voltage command for reduction of the error into the zero-phase component voltage command in a form of a 3 rd harmonic via triple angle-based inverse rotational transform.

11. A method of controlling a motor driving apparatus driving a motor including a plurality of windings respectively corresponding to a plurality of phases, the motor driving apparatus including a first inverter including a plurality of first switching elements, and connected to a first end of each of the windings, a second inverter including a plurality of second switching elements, and connected to a second end of each of the windings, the method comprising:
producing, by a current controller of a controller, based on a predetermined current command of the motor, voltage commands for determining a switching duty of the first switching elements and the second switching elements,
wherein the current controller is further configured to produce a zero-phase component voltage command among the voltage commands by applying 3 rd harmonic feedforward compensation.

12. The method of claim 11 , further including:
comparing, by a first current controller of the current controller, a zero-phase component current command of the motor and a zero-phase component current that flows through the motor, and to produce a zero-phase component voltage value to reduce an error therebetween;
determining, by a 3 rd harmonic calculator of the current controller, a 3 rd harmonic component according to a rotation angle of the motor, a rotation speed of the motor, a magnitude of a zero-phase component magnetic flux of the motor, and a phase of the zero-phase component magnetic flux of the motor; and
producing, by a summing unit of the current controller, the zero-phase component voltage command by adding the 3 rd harmonic component to the zero-phase component voltage value to reduce the error.

13. The method of claim 12 , further including:
comparing, by a second current controller of the current controller, a dq-axes current command of the motor and a dq-axes current that flows through the motor, and producing a dq-axes voltage command to reduce an error therebetween.

14. The method of claim 12 , wherein the current controller further includes:
a first data map storing a predetermined magnitude of a zero-phase component magnetic flux of the motor corresponding to a d-axis current and a q-axis current of the motor; and
a second data map storing a predetermined phase of the zero-phase component magnetic flux of the motor corresponding to the d-axis current and the q-axis current of the motor.

15. The method of claim 14 , wherein the first data map is configured to output, to the 3 rd harmonic calculator, a magnitude of a zero-phase

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Lee Yong Jae
• Jeong Jang Yoon
• Hwang Jae Ho
• Yu Jung Mo

Classifications

• H02P27/08 Primary

  with pulse width modulation · CPC title

• H02M1/0067

  Converter structures employing plural converter units, other than for parallel operation of the units on a single load · CPC title

• H02M7/53871

  with automatic control of output voltage or current · CPC title

• H02P21/08

  Indirect field-oriented control; Rotor flux feed-forward control · CPC title

• H02P21/22

  Current control, e.g. using a current control loop · CPC title