SENSORLESS AC MOTOR CONTROLLER
First Claim
1. A controller for an AC electric motor, the controller comprising:
- i) a Feed Forward Torque Controller which directly derives a torque related component of applied motor voltages from a signal representing a torque command input T* and at least one motor parameter;
ii) a load model, which derives a motor speed value including a model of motor speed behaviour of the AC electric motor to provide an output signal which represents the motor speed of the AC electric motor for use in determining a frequency of rotation of an applied motor voltage vector and where an input to the load model is the signal representing the torque command input T*, the load model using the signal representing the torque command T*, at least over a part of an operating speed range of the AC motor which includes zero speed, to determine the motor speed output signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A controller for an AC electric motor, includes a Feed Forward Torque Controller and a load model. The Torque controller directly derives a torque related component of applied motor voltages from a signal representing a torque command input T* and at least one motor parameter. The load model derives a motor speed value including a model of motor speed behaviour of the AC electric motor to provide an output signal which represents the motor speed of the AC electric motor. This motor speed output signal is used in determining a frequency of rotation of an applied motor voltage vector. Where an input to the load model is the signal representing the torque command input T*, the load model uses the signal representing the torque command T*, at least over a part of an operating speed range of the AC motor which includes zero speed, to determine the motor speed output signal.
73 Citations
67 Claims
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1. A controller for an AC electric motor, the controller comprising:
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i) a Feed Forward Torque Controller which directly derives a torque related component of applied motor voltages from a signal representing a torque command input T* and at least one motor parameter; ii) a load model, which derives a motor speed value including a model of motor speed behaviour of the AC electric motor to provide an output signal which represents the motor speed of the AC electric motor for use in determining a frequency of rotation of an applied motor voltage vector and where an input to the load model is the signal representing the torque command input T*, the load model using the signal representing the torque command T*, at least over a part of an operating speed range of the AC motor which includes zero speed, to determine the motor speed output signal. - View Dependent Claims (2, 3, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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Specification