METHOD OF CONTROLLING AN AC MACHINE AND CONTROLLER FOR CONTROLLING AN AC MACHINE
First Claim
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1. A method of controlling an AC machine that includes a stator and a rotor, the method including:
- operating the AC machine in a field weakening mode in which the machine is operating above the rated speed of the AC machine;
observing a stability parameter that is indicative of the stability of the AC machine and dependent on a current state of the AC machine; and
controlling the AC machine based on the observed stability parameter so as to promote stable operation of the AC machine.
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Abstract
A method of controlling an AC machine that includes a stator and a rotor. The method includes observing a stability parameter that is indicative of the stability of the AC machine and dependent on a current state of the AC machine; and controlling the AC machine based on the observed stability parameter so as to promote stable operation of the AC machine. The method may include controlling the AC machine to operate as a motor or as a generator. The AC machine may be a permanent magnet synchronous machine. A controller suitable for performing the method is also disclosed.
94 Citations
15 Claims
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1. A method of controlling an AC machine that includes a stator and a rotor, the method including:
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operating the AC machine in a field weakening mode in which the machine is operating above the rated speed of the AC machine; observing a stability parameter that is indicative of the stability of the AC machine and dependent on a current state of the AC machine; and controlling the AC machine based on the observed stability parameter so as to promote stable operation of the AC machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A controller for controlling an AC machine that includes a stator and a rotor, the controller including:
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an observer configured to observe a stability parameter that is indicative of the stability of the AC machine and dependent on a current state of the AC machine when the AC machine is operating in a field weakening mode in which the machine is operating above the rated speed of the AC machine; wherein the controller is configured to control the AC machine based on the observed stability parameter so as to promote stable operation of the AC machine.
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Specification