Method for operating a synchronous motor excited by permanent magnets, electronic control device, motor arrangement, and storage medium

Patent metadata

Field	Value
Publication number	US-11362610-B2
Application number	US-202117177746-A
Country	US
Kind code	B2
Filing date	Feb 17, 2021
Priority date	Aug 17, 2018
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

A method for operating a permanent magnet synchronous motor comprises setting a maximum power, determining a current vector and an output voltage vector in the dq coordinate system. A setpoint amount for a setpoint voltage vector is calculated on the basis of the maximum power, the current vector and the output voltage vector. The setpoint voltage vector is generated with the setpoint amount, and then operating the permanent magnet synchronous motor at least with the setpoint voltage vector.

First claim

The invention claimed is:

1. A method for operating a permanent magnet synchronous motor, the method comprising the following steps:
setting a maximum power as a product of a specified voltage and a specified maximum current intensity;
determining a current vector in the dq coordinate system;
determining an output voltage vector in the dq coordinate system;
calculating a setpoint amount for a setpoint voltage vector on the basis of the maximum power, the current vector and the output voltage vector;
generating the setpoint voltage vector with the setpoint amount; and
operating the permanent magnet synchronous motor at least with the setpoint voltage vector.

2. The method as claimed in claim 1 , wherein determining the current vector comprises determining the current vector on the basis of one of a torque requirement and a power limitation and a torque requirement.

3. The method as claimed in claim 1 , wherein determining the current vector comprises determining the current vector on the basis of measured currents flowing through the permanent magnet synchronous motor.

4. The method as claimed in claim 1 , wherein determining the output voltage vector comprises determining the output voltage vector in the dq coordinate system on the basis of one of: a torque requirement, a power limitation and a torque requirement, and the current vector.

5. The method as claimed in claim 1 , further comprising setting an angle of the setpoint voltage vector equal to the angle of the output voltage vector.

6. The method as claimed in claim 1 , wherein calculating the setpoint amount comprises:
calculating the setpoint amount as the product of the factor ⅔ with a quotient comprising a dividend and a divisor;
calculating the dividend as the product of the maximum power and the amount of the output voltage vector, and
calculating the divisor as the sum of the product of the d components of the output voltage vector and the current vector, and the product of the q components of the output voltage vector and the current vector.

7. An electronic control device with instructions comprising:
setting a maximum power as a product of a specified voltage and a specified maximum current intensity;
determining a current vector in the dq coordinate system;
determining an output voltage vector in the dq coordinate system;
calculating a setpoint amount for a setpoint voltage vector on the basis of the maximum power, the current vector and the output voltage vector;
generating the setpoint voltage vector with the setpoint amount, and
operating the permanent magnet synchronous motor at least with the setpoint voltage vector.

8. The device as claimed in claim 7 , wherein determining the current vector comprises determining the current vector on the basis of one of a torque requirement and a power limitation and a torque requirement.

9. The device as claimed in claim 7 , wherein determining the current vector comprises determining the current vector on the basis of measured currents flowing through the permanent magnet synchronous motor.

10. The device as claimed in claim 7 , wherein determining the output voltage vector comprises determining the output voltage vector in the dq coordinate system on the basis of one of: a torque requirement, a power limitation and a torque requirement, and the current vector.

11. The device as claimed in claim 7 , further comprising setting an angle of the setpoint voltage vector equal to the angle of the output voltage vector.

12. The device as claimed in claim 7 , wherein calculating the setpoint amount comprises:
calculating the setpoint amount as the product of the factor ⅔ with a quotient comprising a dividend and a divisor;
calculating the dividend as the product of the maximum power and the amount of the output voltage vector, and
calculating the divisor as the sum of the product of the d components of the output voltage vector and the current vector, and the product of the q components of the output voltage vector and the current vector.

13. A motor arrangement comprising:
a permanent magnet synchronous motor,
an inverter for controlling the permanent magnet synchronous motor; and
an electronic control device for controlling the inverter by setting a maximum power as a product of a specified voltage and a specified maximum current intensity, determining a current vector in the dq coordinate system, determining an output voltage vector in the dq coordinate system, calculating a setpoint amount for a setpoint voltage vector on the basis of the maximum power, the current vector and the output voltage vector, generating the setpoint voltage vector with the setpoint amount, and operating the permanent magnet synchronous motor at least with the setpoint voltage vector.

14. The motor arrangement as claimed in claim 13 , wherein determining the current vector comprises determining the current vector on the basis of one of a torque requirement and a power limitation and a torque requirement.

15. The motor arrangement as claimed in claim 13 , wherein determining the current vector comprises determining the current vector on the basis of measured currents flowing through the permanent magnet synchronous motor.

16. The motor arrangement as claimed in claim 13 , wherein determining the output voltage vector comprises determining the output voltage vector in the dq coordinate system on the basis of one of: a torque requirement, a power limitation and a torque requirement, and the current vector.

17. The motor arrangement as claimed in claim 13 , further comprising setting an angle of the setpoint voltage vector equal to the angle of the output voltage vector.

18. The motor arrangement as claimed in claim 13 , wherein calculating the setpoint amount comprises:
calculating the setpoint amount as the product of the factor ⅔ with a quotient comprising a dividend and a divisor;
calculating the dividend as the product of the maximum power and the amount of the output voltage vector, and
calculating the divisor as the sum of the product of the d components of the output voltage vector and the current vector, and the product of the q components of the output voltage vector and the current vector.

Assignees

• Continental Teves Ag & Co Ohg

Inventors

• Schulte Dominik
• Budianu Bogdan
• Bartel Eugen
• Kaufmann Tom

Classifications

• H02P29/032

  Preventing damage to the motor, e.g. setting individual current limits for different drive conditions · CPC title

• B60L2240/429

  Current · CPC title

• B60L3/12

  Recording operating variables {; Monitoring of operating variables} · CPC title

• B60L2240/427

  Voltage · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title