Rotor angle estimation for permanent magnet synchronous motor drive

• US 20050081647A1
• Filed: 10/18/2004
• Published: 04/21/2005
• Est. Priority Date: 11/12/2001
• Status: Active Grant

• Current Assignee: Infineon Technologies Americas Corp. (Infineon Technologies AG)
• Original Assignee: International Rectifier Corporation (Infineon Technologies AG)
• Inventors: Yin Ho, Eddy Ying
• Granted Patent: US 7,299,708 B2
• Time in Patent Office: Days
• US Class Current: 73/862.193
• CPC Class Codes: H02P 6/085 in a bridge configuration
• CPC Class Codes: H02P 6/18 without separate position detecting elements

Abstract

A method of determining a rotor angle in a drive control for a motor, comprising the steps of (a) determining a rotor magnetic flux in the motor; (b) estimating the rotor angle on the basis of the rotor magnetic flux; and (c) correcting the estimated rotor angle on the basis of reactive power input to the motor. Step (a) may include the step of non-ideal integration of stator voltage and current values. Step (b) may include the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F). Step (c) may include the steps of (1) calculating a first reactive power input value as 1.5*We*(C_Lq *I*I) and a second reactive power input value as 1.5*(Vq*id−Vd*iq); (2) determining a difference between said first and second reactive power input values; and (3) applying said difference to the rotor angle estimated in step (b) to obtain a corrected rotor angle.

Claims

1. A method of determining a rotor angle in a drive control for a motor, comprising the steps of:

a) determining a rotor magnetic flux in the motor;

b) estimating the rotor angle on the basis of the rotor magnetic flux; and

c) correcting the estimated rotor angle on the basis of reactive power input to the motor.

2. The method of claim 1, wherein step (a) includes the step of non-ideal integration of stator voltage and current values.

3. The method of claim 2, wherein step (b) includes the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F).

4. A method of determining a rotor angle in a drive control for a motor, comprising the steps of:

estimating a rotor angle; and

correcting the estimated rotor angle on the basis of reactive power input to the motor.

5. A system for determining a rotor angle in a drive control for a motor, comprising:

a) a first circuit for determining a rotor magnetic flux in the motor;

b) a second circuit for estimating the rotor angle on the basis of the rotor magnetic flux; and

c) a third circuit for correcting the estimated rotor angle on the basis of reactive power input to the motor.

6. The system of claim 5, wherein said first circuit carries out non-ideal integration of stator voltage and current values.

7. The system of claim 6, wherein said second circuit corrects phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F).

11. The system of claim 5, wherein said system is connected to a terminal of the motor for measuring said reactive power input.

12. The system of claim 11, wherein said motor is a permanent magnet surface-mount motor.

8. A system for determining a rotor angle in a drive control for a motor, comprising:

a circuit for estimating a rotor angle; and

a circuit for correcting the estimated rotor angle on the basis of reactive power input to the motor.

9. The system of claim 8, wherein said system is connected to a terminal of said motor for measuring said rotor magnetic flux.

10. The system of claim 9, wherein said motor is a permanent magnet surface-mount motor.

13. The system of claim 8, wherein said system is connected to a terminal of the motor for measuring said stator voltage current values.

14. The system of claim 13, wherein said motor is a permanent magnet surface-mount motor.

15. The system of claim 8, wherein said system is connected to a terminal of the motor for measuring said reactive power input.