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Methods-and-apparatus-for-increasing-power-of-permanent-magnet-motors

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Methods and apparatus for increasing power of permanent magnet motors

Details

Inventors: Miekka, Fred N.; Mackie, Peter W.;
Assignee:
Primary Examiner: Mullins; Burton S.
Assistant Examiner:
Attorney, Agent or Firm: Satermo; Eric K.

A method of increasing the power output of existing permanent magnet motors along with apparatus is disclosed. Increased power output is achieved by more completely utilizing the magnetic field of motor permanent magnets during running. The apparatus is external to the motor and therefore eliminates the need for modifications to the motor itself. The method involves providing a source of power to a permanent magnet motor which is capable of demagnetizing the motor permanent magnets at stall, and reducing the power at start up to a level sufficient to prevent demagnetization. Full power to the motor is provided when the motor speed reaches a level sufficient to prevent demagnetization of the permanent magnets.

DETAILED DESCRIPTION In summary, the present invention provides a method for increasing the power output of permanent magnet motors.
A power supply capable of demagnetizing motor permanent magnets is power limited to a safe level sufficient to prevent demagnetization on motor start up.
Speed and/or current sensing circuitry activates full power to the motor when conditions such as speed and current reach a level sufficient to prevent demagnetization.

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