Motor control system having bandwidth compensation

• US 9,143,081 B2
• Filed: 03/14/2013
• Issued: 09/22/2015
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Steering Solutions IP Holding Corporation (Nexteer Automotive Group Ltd.)
• Original Assignee: Steering Solutions IP Holding Corporation (Nexteer Automotive Group Ltd.)
• Inventors: Gebregergis, Abraham, RajaVenkitasubramony, Ramakrishnan, Sebastian, Tomy, Popy, Niharika P.
• Primary Examiner(s): Masih, Karen
• Application Number:
  US13/804,873
• Publication Number:
  US 20140265962A1
• Time in Patent Office: 922 Days
• Field of Search: 318/400.23, 318/504, 318/503, 318/432, 318/443, 318/400.02, 318/400.12
• US Class Current: 1/1
• CPC Class Codes: B62D 5/046 Controlling the motor
• CPC Class Codes: H02P 21/05 specially adapted for damping motor oscillations, e.g. for reducing hunting
• CPC Class Codes: H02P 21/22 Current control, e.g. using a current control loop
• CPC Class Codes: H02P 29/50 Reduction of harmonics
• CPC Class Codes: H02P 31/00 Arrangements for regulating or controlling electric motors not provided for in groups H02P1/00 - H02P5/00, H02P7/00 or H02P21/00 - H02P29/00
• CPC Class Codes: H02P 6/10 Arrangements for controlling torque ripple, e.g. providing reduced torque ripple

Abstract

A motor control system for determining a ripple compensating current is provided. The motor control system includes a motor having a plurality of motor harmonics and a motor frequency, and a bandwidth compensation controller that is in communication with the motor. The bandwidth compensation controller is configured to determine a magnitude response compensation value and a phase compensation value for each of the plurality of motor harmonics. The magnitude response compensation value and the phase compensation value are both based on the motor frequency. The bandwidth compensation controller is configured to determine the ripple compensating current based on the magnitude response compensation value and the phase compensation value.

Claims

1. A motor control system for determining, comprising:

a motor having a plurality of motor harmonics and a motor frequency; and

a bandwidth compensation controller in communication with the motor, the bandwidth compensation controller configured to;

determine a magnitude response compensation value and a phase compensation value for each of the plurality of motor harmonics, the magnitude response compensation value and the phase compensation value both based on the motor frequency; and

determine a ripple compensating current based on the magnitude response compensation value and the phase compensation value.

2. The motor control system of claim 1, wherein the ripple compensating current is a q-axis ripple compensating current, and determined by:

3. The motor control system of claim 1, wherein the ripple compensating current is a d-axis ripple compensating current, and determined by:

4. The motor control system of claim 1, further comprising a torque ripple compensation controller in communication with the bandwidth compensation controller, wherein the torque ripple compensation controller includes a plurality of look-up tables.

5. The motor control system of claim 4, wherein each of the plurality of look-up tables are used to determine one of a torque ripple magnitude and a torque ripple phase for one of the plurality of motor harmonics.

6. The motor control system of claim 5, wherein the torque ripple compensation controller calculates a current harmonic magnitude based on the torque ripple magnitude.

7. The motor control system of claim 6, wherein the magnitude response compensation value is based on the current harmonic magnitude and a frequency compensation value.

8. The motor control system of claim 5, wherein the torque ripple compensation controller calculates a phase output based on the torque ripple phase.

9. The motor control system of claim 8, wherein the phase compensation value is based on the phase output and a frequency compensation value.

10. The motor control system of claim 1, wherein the bandwidth compensation controller determines a frequency compensation value for an i^th motor harmonic by:

11. A method of motor control for a motor having a plurality of motor harmonics, comprising:

determining a magnitude response compensation value and a phase compensation value for each of the plurality of motor harmonics by a bandwidth compensation controller, the magnitude response compensation value and the phase compensation value both based on a motor frequency; and

determining a ripple compensating current based on the magnitude response compensation value and the phase compensation value.

12. The method of claim 11, wherein the ripple compensating current is a q-axis ripple compensating current, and determined by:

13. The method of claim 11, wherein the ripple compensating current is a d-axis ripple compensating current, and determined by:

14. The method of claim 11, further comprising providing a torque ripple compensation controller in communication with the bandwidth compensation controller, wherein the torque ripple compensation controller includes a plurality of look-up tables.

15. The method of claim 14, wherein each of the plurality of look-up tables are used to determine one of a torque ripple magnitude and a torque ripple phase for one of the plurality of motor harmonics.

16. The method of claim 15, wherein the torque ripple compensation controller calculates a current harmonic magnitude based on the torque ripple magnitude.

17. The method of claim 16, wherein the magnitude response compensation value is based on the current harmonic magnitude and a frequency compensation value.

18. The method of claim 15, wherein the torque ripple compensation controller calculates a phase output based on the torque ripple phase.

19. The method of claim 18, wherein the phase compensation value is based on the phase output and a frequency compensation value.

20. The method of claim 11, further comprising determining a frequency compensation value for an i^th motor harmonic by: