Active motor current limiting of synchronous motor drives
AssigneeSteering Solutions IP Holding Corporation
InventorsPrerit Pramod, Krishna M P K Namburi, Nakul Shah
Life of this patent
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Abstract
A method of controlling operation of an electric machine includes: calculating a voltage-based torque limit based on a voltage constraint of a direct current (DC) bus supplying power to an inverter for powering the electric machine; calculating a current-based torque limit based on a motor current limit; determining a final torque limit based on the voltage-based torque limit and the current-based torque limit; determining a limited command torque based on a torque command and the final torque limit; and generating at least one current command based on, at least, the limited command torque. A control system for controlling operation of an electric machine is also provided.
Claims20
A method of controlling operation of an electric machine, comprising:
- calculating a voltage-based torque limit based on a voltage constraint of a direct current (DC) bus supplying power to an inverter for powering the electric machine;
- calculating a current-based torque limit based on a motor current limit;
- determining a final torque limit based on the voltage-based torque limit and the current-based torque limit;
- determining a limited command torque based on a torque command and the final torque limit;
- and
- generating at least one current command based on, at least, the limited command torque.
A control system for controlling operation of an electric machine, comprising:
- a processor;
- and
- a memory that includes instructions that, when executed by the processor, cause the processor to:
- calculate a voltage-based torque limit based on a voltage constraint of a direct current (DC) bus supplying power to an inverter for powering the electric machine;
- calculate a current-based torque limit based on a motor current limit;
- determine a final torque limit based on the voltage-based torque limit and the current-based torque limit;
- determine a limited command torque based on a torque command and the final torque limit;
- and
- generate at least one current command based on, at least, the limited command torque.
A control system for controlling operation of an electric machine, comprising:
- an inverter including a plurality of switches operable to supply an alternating current to the electric machine;
- and
- a controller operable to:
- calculate a voltage-based torque limit based on a voltage constraint of a direct current (DC) bus supplying power to an inverter for powering the electric machine;
- calculate a current-based torque limit based on a motor current limit;
- determine a final torque limit based on the voltage-based torque limit and the current-based torque limit;
- determine a limited command torque based on a torque command and the final torque limit;
- generate at least one current command based on, at least, the limited command torque;
- and
- selectively control the plurality of switches within the inverter to cause the inverter to supply the alternating current to the electric machine based on the at least one current command.
Dependencies are inferred from the claim text.