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. The method of claim 1, wherein step (c) includes the steps of:
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); determining a difference between said first and second reactive power input values; and applying said difference to the rotor angle estimated in step (b) to obtain a corrected rotor angle.
- 5. 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; and b) estimating the rotor angle on the basis of the rotor magnetic flux; wherein step (a) includes the step of non-ideal integration of stator voltage and current values.
- 6. The method of claim 5, wherein step (b) includes the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F).
- 7. 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.
- 8. The method of claim 7, wherein said correcting step includes the steps of:
calculating a first reactive power input value as We*(C_Lq*I*I) and a second reactive power input value as (Vq*id−Vd*iq); determining a difference between said first and second reactive power input values; and applying said difference to the estimated rotor angle to obtain a corrected rotor angle.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is based on and claims priority of U.S. Provisional Patent Application Serial No. 60/337,506 filed Nov. 12, 2001, the disclosures of which are incorporated by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60337506 |
Nov 2001 |
US |