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Wirelessly powered electric motor

  • US 9,806,658 B2
  • Filed: 03/06/2014
  • Issued: 10/31/2017
  • Est. Priority Date: 03/06/2014
  • Status: Active Grant
First Claim
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1. A method of controlling an electric motor, the method comprising controlling a motion of the electric motor via:

  • transmitting power to windings of the electric motor by wireless magnetic coupling between transmission coils and the windings, the electric motor being located at a first location and the transmission coils and electronic components controlling the motion of the electric motor being located at a second location physically separated from the first location;

    identifying, via the electronic components, a position of a rotor of the electric motor by identifying an effect of a position of the rotor on an inductance of a power transmitter;

    controlling, via the electronic components, a timing of transmitting the power to the windings in response to the position of the rotor;

    transmitting the power to the windings at a first frequency corresponding to a resonant frequency of first windings of the electric motor;

    and transmitting the power to the windings at a second frequency corresponding to a resonant frequency of second windings of the electric motor, the second frequency being non-harmonic to the first frequency.

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