Stator winding control circuit for a brushless d.c. motor
AssigneePioneer Electronic Corporation
InventorsSaburo Takaoka, Norikazu Fujie
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Abstract
A brushless d.c. motor includes a plurality of Hall elements 1-3 for detecting the relative positions of the rotor and stator poles, a comparator circuit 103 responsive to a bipolar input control signal A for generating an output signal B proportional to the absolute magnitude of signal A and an output signal D as a function of the polarity of signal A, a timing signal generator 104 for generating output signals E timed in relation to the Hall element outputs F and having a phase sequence in response to signal D, and a reversible current supply circuit 105 for driving a set of Y-connected stator windings 101 with currents C having a magnitude proportional to signal B and a phase sequence in accordance with signal E.
Claims7
A brushless d.c. motor, comprising:
- a. a stator including multi-phase windings,
- b. a rotor having a plurality of magnetic poles,
- c. position detecting means for producing output signals in response to the positional relationship between said stator and said rotor,
- d. means including a comparator for producing a first output signal in response to the absolute value of an input control signal and a second output signal in response to the polarity of said input control signal,
- e. means for producing a plurality of timing signals having a phase sequence in accordance with the polarity of said second output signal and timed in accordance with the output signals from said position detection means, and
- f. means for sequentially driving said multi-phase stator windings with currents having magnitudes proportional to the absolute value of said first output signal and a phase sequence corresponding to that of said timing signals, whereby reversible torques may be produced in said motor.
Dependencies are inferred from the claim text.