Field weakening regulator for CVFR current regulator

Patent metadata

Field	Value
Publication number	US-12047022-B2
Application number	US-202117492766-A
Country	US
Kind code	B2
Filing date	Oct 4, 2021
Priority date	Oct 4, 2021
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A method of controlling a motor controlled by a motor controller that includes a complex vector flux regulator (CVλR). The method includes: receiving at a field weakening regulator of the motor controller a modulation index that is a scaled version of an available voltage available to be provided to the motor by a voltage source; comparing the modulation index to a feedback modulation index to produce an error scalar that has a magnitude in a flux domain; determining a final direction (αfinal) of the error scalar in the flux domain; and providing the CVλR with flux commands in the d and q domain based on the error scalar and the direction.

First claim

What is claimed is:

1. A method of controlling a motor controlled by a motor controller that includes a complex vector flux regulator (CVλR), the method comprising:
receiving at a field weakening regulator of the motor controller a modulation index that is a scaled version of an available voltage available to be provided to the motor by a voltage source;
comparing the modulation index to a feedback modulation index to produce an excursion error;
applying a voltage scalar to convert the excursion error to a scalar voltage that is then converted to an error scalar that has a magnitude in a flux domain of the motor, wherein the scalar voltage is converted by applying a conversion factor 1/r where r is a scalar that is based on a time constant of the motor;
determining a final direction (α final ) of the error scalar in the flux domain; and
providing the CVλR with flux commands in d and q domain of the flux domain based on the error scalar and the final direction for controlling the motor;
wherein the time constant is calculated as a selected ratio Ke multiplied by a sampling period Ts for the motor.

2. The method of claim 1 , wherein the final direction is determined in the flux domain and is based on the available voltage which can be represented as a circle in the flux domain.

3. The method of claim 1 , further comprising:
providing the error scalar to a proportional integral controller to produce needed flux change for controlling the motor (Δλ sPI ).

4. The method of claim 3 , wherein the needed flux change is converted into d and q components (Δλ d and Δλ q ).

5. The method of claim 4 , wherein the d and q components (Δλ d and Δλ q ) are based off of cosine and sine of the direction.

6. A system comprising:
a memory having computer readable instructions; and
one or more processors for executing the computer readable instructions, the computer readable instructions controlling the one or more processors to perform operations comprising:
receiving at a field weakening regulator of a motor controller of a motor a modulation index that is a scaled version of an available voltage available to be provided to the motor by a voltage source;
comparing the modulation index to a feedback modulation index to produce an excursion error;
applying a voltage scalar to convert the excursion error to a scalar voltage that is then converted to an error scalar that has a magnitude in a flux domain of the motor, wherein the scalar voltage is converted by applying a conversion factor 1/r where r is a scalar that is based on a time constant of the motor;
determining a final direction (α final ) of the error scalar in the flux domain; and
providing a complex vector flux regulator (CVλR) of the motor controller with flux commands in d and q domain of the flux domain based on the error scalar and the final direction for controlling the motor;
wherein the time constant is calculated as a selected ratio Ke multiplied by a sampling period Ts for the motor.

7. The system of claim 6 , wherein the final direction is determined in the flux domain and is based on the available voltage which can be represented as a circle in the flux domain.

8. The system of claim 6 , wherein the computer readable instructions control the one or more processors to further perform operations comprising:
providing the error scalar to a proportional integral controller to produce needed flux change for controlling the motor (Δλ sPI ).

9. The system of claim 8 , wherein the needed flux change is converted into d and q components (Δλ d and Δλ q ).

10. An internal permanent magnet motor comprising:
a stator;
a rotor;
an inverter; and
a motor controller that includes a complex vector flux regulator (CVλR) configured to:
receive at a field weakening regulator of the motor controller a modulation index that is a scaled version of an available voltage available to be provided to the motor by a voltage source;
compare the modulation index to a feedback modulation index to produce an excursion error;
apply a voltage scalar to convert the excursion error to a scalar voltage that is then converted to an error scalar that has a magnitude in a flux domain of the motor, wherein the scalar voltage is converted by applying a conversion factor 1/r where r is a scalar that is based on a time constant of the motor;
determine a final direction (α final ) of the error scalar in the flux domain; and
provide the CVλR with flux commands in d and q domain of the flux domain based on the error scalar and the final direction to control operation of the motor via the inverter;
wherein the time constant is calculated as a selected ratio Ke multiplied by a sampling period Ts of the motor.

11. The system of claim 10 , wherein the final direction is determined in the flux domain and is based on the available voltage which can be represented as a circle in the flux domain.

12. The system of claim 11 , wherein the motor controller is further configured to provide the error scalar to a proportional integral controller to produce needed flux change for controlling the motor (Δλ sPI ).

13. The system of claim 12 , wherein the needed flux change is converted into d and q components (Δλ d and λλ q ).

14. The system of claim 13 , wherein the d and q components (Δλ d and Δλ q ) are based off of cosine and sine of the final direction.

Assignees

• Borgwarner Inc

Inventors

• Simili Dwarakanath V
• Secrest Caleb W

Classifications

• H02P21/0089 Primary

  using field weakening · CPC title

• H02P21/0003

  Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control · CPC title

• H02P21/141 Primary

  Flux estimation · CPC title