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Commutating device for an electric motor supplied from a d-c voltage source

  • US 4,494,049 A
  • Filed: 09/28/1982
  • Issued: 01/15/1985
  • Est. Priority Date: 10/23/1981
  • Status: Expired due to Fees
First Claim
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1. A commutating device for an electric motor comprising:

  • (a) a plurality of transistor switches each having two switching terminals and a control terminal arranged in a bridge circuit;

    (b) means for detecting rotor position and developing an output signal corresponding thereto;

    (c) means for generating from said outputs signal a control signal for each transistor switch; and

    (d) a control circuit associated with each transistor coupled across said two switching terminals to obtain therefrom a control voltage, said control circuit receiving one of said control signals and responsive thereto to couple said control voltage to the control terminals of said transistor, said control circuit comprising;

    (i) a voltage regulator for regulating the control voltage obtained from across said terminals;

    (ii) a capacitor for storing said voltage;

    and(iii) a further transistor for coupling said capacitor voltage to said control terminals in response to a control signal.

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