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AssigneeRockwell Automation Technologies, Inc.
InventorsSemyon Royak, Mark M. Harbaugh
Estimating the term…
The invention includes a motor controller and technique for controlling a permanent magnet motor. In accordance with one aspect of the present technique, a permanent magnet motor is controlled by receiving a torque command, determining a physical torque limit based on a stator frequency, determining a theoretical torque limit based on a maximum available voltage and motor inductance ratio, and limiting the torque command to the smaller of the physical torque limit and the theoretical torque limit. Receiving the torque command may include normalizing the torque command to obtain a normalized torque command, determining the physical torque limit may include determining a normalized physical torque limit, determining a theoretical torque limit may include determining a normalized theoretical torque limit, and limiting the torque command may include limiting the normalized torque command to the smaller of the normalized physical torque limit and the normalized theoretical torque limit.
A method for controlling a permanent magnet motor comprising:
A method of controlling a permanent magnet motor comprising:
A motor controller comprising:
The motor controller of 17, wherein the control circuitry is configured to limit the torque command to the theoretical torque limit based at least in part on the inductance ratio of the permanent magnet motor, a value of available voltage, and a flux-producing current.
The motor controller of 17, wherein the control circuitry is configured to limit the torque command to a lesser of the theoretical torque limit or a physical torque limit based on a frequency or speed.
A motor controller comprising:
A method of controlling a permanent magnet motor comprising:
Dependencies are inferred from the claim text.