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System and method for preventing permanent magnet demagnetization in electrical machines

  • US 10,230,321 B1
  • Filed: 10/23/2017
  • Issued: 03/12/2019
  • Est. Priority Date: 10/23/2017
  • Status: Active Grant
First Claim
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1. A motor drive for driving an electrical machine having one or more permanent magnets therein, the motor drive comprising:

  • an inverter having a plurality of switches therein that are selectively operated to control current flow and terminal voltages in the electrical machine; and

    a controller operatively connected to the inverter and configured to control switching of the plurality of switches to control the current flow and terminal voltages in the electrical machine, the controller being programmed to;

    analyze at least one of voltages and currents provided to the electrical machine on one or more phases to identify a fault condition in the electrical machine; and

    control switching of the plurality of switches in the inverter to modify current flow and terminal voltages in the electrical machine based on the identified fault condition, so as to prevent demagnetization of the one or more permanent magnets in the electrical machine.

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