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Starting sequence for reluctance motor drives operating without a shaft position sensor

  • US 4,642,543 A
  • Filed: 12/09/1985
  • Issued: 02/10/1987
  • Est. Priority Date: 12/09/1985
  • Status: Expired due to Term
First Claim
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1. A controller for a multiphase motor comprising:

  • current sensing means adapted to be coupled to said motor for providing an indicating signal when the average total current flowing in said motor exceeds a predetermined value;

    state sequencing means coupled to said current sensing means for generating a sequence of starting signals, said sequence comprising an align signal, a check signal and a ramp signal, said check signal following a predetermined starting delay after the end of said align signal, said ramp signal following said check signal if said indicating signal is absent during said check signal, said align signal following said check signal if said indicating signal is present during said check signal; and

    phase sequencing means coupled to said state sequencing means and adapted to be coupled to said motor for energizing a predetermined stator phase of said motor in response to said align signal, for stepping the stator phases of said motor at a predetermined frequency during said starting delay and during said check signal, and for increasing the stepping rate of said stator phases from said predetermined frequency to a desired running frequency in response to said ramp signal.

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