Method, computer program product and system for operating an asynchronous machine

Patent metadata

Field	Value
Publication number	US-10763770-B2
Application number	US-201916413266-A
Country	US
Kind code	B2
Filing date	May 15, 2019
Priority date	May 16, 2018
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

Operating an asynchronous machine includes: closed loop control of a first and a second three-phase winding by a first and a second closed loop control method, respectively. The second closed loop control method supplies a voltage vector to a second inverter device, and changes from the first closed loop control method to a first open loop control method. The first open loop control method includes supplying a first reference current vector to a first filter device, supplying a filtered first reference current vector to a calculation device for calculating an electrical angle, supplying the electrical angle to a first transformation device for transforming a first open loop control deviation vector, transforming a first open loop control deviation vector into a third voltage vector, and supplying the third voltage vector to the first inverter device for the operation of the first three-phase winding.

First claim

What is claimed is:

1. A method for operating an asynchronous machine, comprising:
a first closed loop control of a first three-phase winding by a first closed loop control method, comprising:
supplying a first voltage vector to a first inverter device for operation of the first three-phase winding; and

a second closed loop control of a second three-phase winding by a second closed loop control method, comprising:
supplying a second voltage vector to a second inverter device for the operation of the second three-phase winding; and
changing from the first closed loop control method to a first open loop control method in reaction to a first event;

wherein the first open loop control method comprises:
supplying a first reference current vector to a first filter device configured to filter a first reference current vector;
supplying the filtered first reference current vector to a calculation device configured to calculate an electrical angle;
supplying the electrical angle to a first transformation device configured to transform a first open loop control deviation vector;
transforming a first open loop control deviation vector into a third voltage vector; and
supplying the third voltage vector to the first inverter device to operate the first three-phase winding.

2. The method according to claim 1 , further comprising in reaction to at least one of the first event and a second event:
changing from the second closed loop control method to a second open loop control method, wherein the second open loop control method comprises:
supplying a second reference current vector to a second filter device configured to filter the second reference current vector;
supplying the filtered second reference current vector to the calculation device configured to calculate the electrical angle;
supplying the electrical angle to a second transformation device configured to transform a second open loop control deviation vector;
generating a fourth voltage vector from the second open loop control deviation vector; and
supplying the fourth voltage vector to the second inverter device to operate the second three-phase winding.

3. The method according to claim 1 , wherein the first event comprises a failure of a current sensor associated with the first three-phase winding.

4. The method according to claim 2 , wherein the second event comprises a failure of a current sensor associated with the second three-phase winding.

5. The method according to claim 2 , wherein at least one of the first event and the second event comprises a user input.

6. The method according to claim 1 , wherein the first closed loop control method comprises:
receiving a first measurement vector, wherein the first measurement vector has three phase current values;
calculating a first difference from the first reference current vector and from the first measurement vector;
supplying the first difference to a proportional integrator to generate a first closed loop control deviation vector; and
transforming the first closed loop control deviation vector into a first voltage vector by an electrical angle,
wherein supplying the first voltage vector to a first inverter device for the operation of the first three-phase winding includes generating a first PWM vector from the first voltage vector and supplying the first PWM vector to the first inverter.

7. A computer program product for the operation of an asynchronous machine executed by a microcontroller to cause the microprocessor to implement a method, wherein the method comprises:
a first closed loop control of a first three-phase winding by a first closed loop control method, comprising:
supplying a first voltage vector to a first inverter device for operation of the first three-phase winding; and

a second closed loop control of a second three-phase winding by a second closed loop control method, comprising:
supplying a second voltage vector to a second inverter device for the operation of the second three-phase winding; and
changing from the first closed loop control method to a first open loop control method in reaction to a first event;

wherein the first open loop control method comprises:
supplying a first reference current vector to a first filter device configured to filter a first reference current vector;
supplying the filtered first reference current vector to a calculation device configured to calculate an electrical angle;
supplying the electrical angle to a first transformation device configured to transform a first open loop control deviation vector;
transforming a first open loop control deviation vector into a third voltage vector; and

supplying the third voltage vector to the first inverter device to operate the first three-phase winding.

8. An asynchronous machine comprising a stator with a first three-phase winding and a second three-phase winding, a rotor, a first inverter device and a second inverter device, wherein the asynchronous machine is operated with a method comprising:
a first closed loop control of a first three-phase winding by a first closed loop control method, comprising:
supplying a first voltage vector to a first inverter device for operation of the first three-phase winding; and
a second closed loop control of a second three-phase winding by a second closed loop control method, comprising:
supplying a second voltage vector to a second inverter device for the operation of the second three-phase winding; and
changing from the first closed loop control method to a first open loop control method in reaction to a first event;
wherein the first open loop control method comprises:
supplying a first reference current vector to a first filter device configured to filter a first reference current vector;
supplying the filtered first reference current vector to a calculation device configured to calculate an electrical angle;
supplying the electrical angle to a first transformation device configured to transform a first open loop control deviation vector;
transforming a first open loop control deviation vector into a third voltage vector; and

supplying the third voltage vector to the first inverter device to operate the first three-phase winding.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Lamsahel Hassan

Classifications

• H02P27/08 Primary

  with pulse width modulation · CPC title

• H02P21/22 Primary

  Current control, e.g. using a current control loop · CPC title

• H02P2207/01

  Asynchronous machines · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title

• H02P21/14

  Estimation or adaptation of machine parameters, e.g. flux, current or voltage · CPC title