DETERMINATION OF ROTOR FATIGUE IN AN ELECTRIC MACHINE ASSEMBLY
First Claim
1. An electric machine assembly comprising:
- an electric machine including a rotor;
a controller operatively connected to the electric machine and configured to receive a torque command;
wherein the rotor is configured to rotate at a rotor speed based at least partially on the torque command;
wherein the controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method for determining a cumulative rotor fatigue (CF) based at least partially on the rotor speed;
wherein the controller is operative to control at least one operating paramater of the electric machine based at least partially on the cumulative rotor fatigue (CF).
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Accused Products
Abstract
An electric machine assembly includes an electric machine including a rotor. A controller operatively connected to the electric machine and configured to receive a torque command. The rotor is configured to rotate at a rotor speed (ω) based at least partially on the torque command. The controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method for determining a cumulative rotor fatigue (FC) based at least partially on the rotor speed. The controller is operative to control at least one operating paramater of the electric machine based at least partially on the cumulative rotor fatigue (FC). The controller is configured to record respective occurrences of the rotor stress value exceeding respective predefined stress levels in chronological order to create a cycle dataset, such that the cycle dataset preserves a time order of the respective occurrences.
18 Citations
18 Claims
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1. An electric machine assembly comprising:
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an electric machine including a rotor; a controller operatively connected to the electric machine and configured to receive a torque command; wherein the rotor is configured to rotate at a rotor speed based at least partially on the torque command; wherein the controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method for determining a cumulative rotor fatigue (CF) based at least partially on the rotor speed; wherein the controller is operative to control at least one operating paramater of the electric machine based at least partially on the cumulative rotor fatigue (CF). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining a cumulative rotor fatigue (CF) in an electric machine assembly having an electric machine with a rotor and a controller having a processor and tangible, non-transitory memory, the controller being configured to receive a torque command such that the rotor rotates at a rotor speed based at least partially on the torque command, the method comprising:
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converting an absolute value of the rotor speed to a rotor stress value using predetermined look-up values, via the controller; recording respective occurrences of the rotor stress value exceeding respective predefined stress levels in chronological order to create a cycle dataset, via the controller, such that the cycle dataset preserves a time order of the respective occurrences; and controlling the electric machine based at least partially on the cumulative rotor fatigue (CF). - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification