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Drive circuit for brushless motor

  • US 5,616,994 A
  • Filed: 01/06/1995
  • Issued: 04/01/1997
  • Est. Priority Date: 01/12/1994
  • Status: Expired due to Fees
First Claim
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1. A brushless motor driving circuit for driving a plurality of armature windings of a brushless motor, comprising:

  • a plurality of the terminal voltage detectors, each being coupled to a respective one of the plurality of armature windings so that the plurality of terminal voltage detectors provide a plurality of terminal voltages corresponding to the plurality of armature windings;

    a terminal voltage compensation circuit having a plurality of inputs, each of the plurality of inputs receiving a respective one of the plurality of terminal voltages, the terminal voltage compensation circuit modifying at least one of the plurality of terminal voltages by a compensation value to generate a plurality of compensated terminal voltages, said compensation value being determined by a winding current of the brushless motor; and

    a comparator having inputs that receive the plurality of compensated terminal voltages, the comparator comparing the plurality of compensated voltages with one another to generate a rotor location signal;

    said armature windings being driven by said rotor location signal generated by said comparator.

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