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Easily started DC motor apparatus

  • US 5,486,742 A
  • Filed: 01/21/1994
  • Issued: 01/23/1996
  • Est. Priority Date: 09/17/1991
  • Status: Expired due to Fees
First Claim
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1. A DC motor comprising:

  • a rotary member for rotating about an axis;

    a stationary member having a pluarlity of coils;

    a position setecting means for detecting a pluarlity of positions of said rotary member as said rotary member rotates about said axis;

    a DC current distributing means responsive to the output of said position detecting means for sequentially swithcing DC current supplied to said plurality of coils;

    a pulsating means for pulsating the DC current flowing through at least one of said plurality of coils selected on the basis of a position of said rotary member detected by said position detector during a period that said DC current is being supplied to said at least one coil; and

    wherein, during start-up of the motor, the DC current is pulsed in a timed sequence such that a driving force due to the DC current coincides with a back-and-forth swing of the rotary member resulting from the inertial force of the rotary member when the DC current pulses are supplied thereto.

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