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