Rotor angle estimation for permanent magnet synchronous motor drive
View Patent ↗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.
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, by calculating a first reactive power input value and a second reactive power input value; determining a difference between said first and second reactive power input values; and applying said differnece to the rotor angle estimated in step (b) to obtain a corrected rotor angle.
2. The method of claim 1 , wherein step (a) includes the step of non-ideal integration of stator voltage and current values.
3. 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, wherein step (a) includes the step of non-ideal integration of stator voltage and current values; and
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 said first reactive power input value as 1.5*We*(C_Lq*I*I) and said second reactive power input value as 1.5*(Vq*id−Vd*iq).
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; and
wherein step (b) includes the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F).
6. 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, by calculating a first reactive power input value and a second reactive power input value; 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.
7. The method of claim 6 , wherein said correcting step includes the steps of:
calculating said first reactive power input value as We*(C_Lq*I*I) and said second reactive power input value as (Vq*id−Vd*iq).
8. 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, by calculating a first reactive power input value and a second reactive power input value; 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.
9. The system of claim 8 , wherein said first circuit carries out non-ideal integration of stator voltage and current values.
10. 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,
wherein said first circuit carries out non-ideal integration of stator voltage and current values; and
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 8 , wherein said third circuit:
calculates said first reactive power input value as 1.5*WE*(C_Lq*I*I) and said second reactive power input value as 1.5*(Vq*id−Vd*iq).
12. A system for determining a rotor angle in a drive control for a motor, comprising:
a) a first circuit for determining rotor magnetic flux in the motor; and
b) a second circuit for estimating the rotor angle on the basis of the rotor magnetic flux;
wherein said first circuit carries out non-ideal integration of stator voltage and current values; and
wherein said second circuit corrects phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F).
13. 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, by calculating a first reactive power input value and a second reactive power input value; 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.
14. The system of claim 13 , wherein said correcting circuit:
calculates said first reactive power input value as We*(C_Lq*I*I) and said second reactive power input value as (Vq*id−Vd*iq).
15. The system of claim 8 , wherein said system is connected to a terminal of said motor for measuring said rotor magnetic flux.
16. The system of claim 15 , wherein said motor is a permanent magnet surface-mount motor.
17. The system of one of claims 8 and 13 , wherein said system is connected to a terminal of the motor for measuring said reactive power input.
18. The system of claim 17 , wherein said motor is a permanent magnet surface-mount motor.
19. The system of claim 8 , wherein said system is connected to a terminal of the motor for measuring said stator voltage current values.
20. The system of claim 19 , wherein said motor is a permanent magnet surface-mount motor.