Brushless motor drive circuit

Details Brushless motor drive circuit Brushless motor drive circuit

1990-07-03

1992-12-22

Smith, Jr., David

Electricity: motive power systems

Reciprocating or oscillating motor

Energizing winding circuit control

H02P 506, H02K 2900

Patent

active

051736454

ABSTRACT:
A brushless motor drive circuit having a position detection output signal in the form of an m-phase sine wave with a signal composing circuit to flatten the inflection points of the sine wave by logarithmic compression. Switching elements control the rate of the current to the drive coil in response to the signal composing circuit. Simultaneously, the switching elements having the same phase are switched on to supply a resistive feedback element with reactive current during the periods when no current is to be supplied to the drive coil.

REFERENCES:
patent: 3924167 (1975-12-01), Clark et al.
patent: 4230976 (1980-10-01), Muller
patent: 4442386 (1984-04-01), Uchida et al.
patent: 4912379 (1990-03-01), Matsuda et al.
patent: 4987352 (1991-01-01), Ishii

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