Control scheme for starting dual channel permanent magnet motor drive system under ossc fault of one channel
AssigneeGoodrich Actuation Systems Limited
InventorsMaamar BENAROUS, Mohamed Elsayed RASHED MOHAMED ALABASSY
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Abstract
A control scheme for starting a dual channel permanent magnet motor drive system under a one-switch short circuit (OSSC) fault on one channel in which the reference torque used for controlling the faulty channel is varied as a function of motor speed according to a certain predefined function to optimise the torque produced by the faulty channel whilst also keeping the current within the faulty channel below the current limit of the power inverter within the faulty channel.
Claims19
A method of operating a dual channel permanent magnet motor drive system, wherein each channel comprises a respective power inverter, the power inverter being controlled to produce torque based on a certain reference torque value, the method comprising:
- determining that one of the channels of the dual channel permanent magnet motor drive system has a one switch short circuit (OSSC) fault, the dual permanent magnet motor drive system thus having a healthy channel and a faulty channel;
- during start-up of the motor drive system, while the motor speed is below a certain threshold motor speed, controlling both channels of the dual channel permanent magnet motor drive system to provide torque,
- wherein the healthy channel is controlled to provide a desired output torque based on a first reference torque,
- wherein the faulty channel is controlled to provide an output torque based on a second reference torque, and
- wherein the second reference torque is varied according to a certain function of motor speed.
A dual channel permanent magnet motor drive system, wherein each channel comprises a respective power inverter, the power inverter being controlled to produce torque based on a certain reference torque value, the system comprising:
- a control circuit that is configured to control operation of the motor drive system;
- and
- a one switch short circuit (OSSC) fault detection circuit,
- wherein the control circuit is configured to:
- when it is determined by the OSSC fault detection circuit that one of the channels of the dual channel permanent magnet motor drive system has a OSSC fault, the dual permanent magnet motor drive system thus having at least one faulty channel, during start-up of the motor drive system, whilst the motor speed is below a certain threshold motor speed:
- control both channels of the dual channel permanent magnet motor drive system to provide torque,
- wherein the healthy channel is controlled to provide a desired output torque based on a first reference torque,
- wherein the faulty channel is controlled to provide an output torque based on a second reference torque, and
- wherein the second reference torque is varied according to a certain function of motor speed.
A non-transitory computer program product containing instructions that when executed by a processor perform a method of operating a dual channel permanent magnet motor drive system, wherein each channel comprises a respective power inverter, the power inverter being controlled to produce torque based on a certain reference torque value, the method comprising:
- determining that one of the channels of the dual channel permanent magnet motor drive system has a one switch short circuit, “OSSC”, fault, the dual permanent magnet motor drive system thus having a healthy channel and a faulty channel:
- during start-up of the motor drive system, whilst the motor speed is below a certain threshold motor speed, controlling both channels of the dual channel permanent magnet motor drive system to provide torque,
- wherein the healthy channel is controlled to provide a desired output torque based on a first reference torque,
- wherein the faulty channel is controlled to provide an output torque based on a second reference torque, and
- wherein the second reference torque is varied according to a certain function of motor speed.
Dependencies are inferred from the claim text.