System for driving a brushless motor

Details System for driving a brushless motor System for driving a brushless motor

1989-10-03

1990-09-25

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388911, H02D 516

Patent

active

049589482

ABSTRACT:
A system for driving a brushless motor comprises motor drive coils belonging to a plurality of phases respectively, a plurality of pairs of drive transistors connected to the drive coils respectively, a distribution circuit for sequentially distributing drive-coil energization switching signals to the plural drive transistors respectively, a slope synthesizer for smoothing leading and trailing slope portions of the drive-coil energization switching signals so as to apply the smoothed energization switching signals to the drive transistors respectively through the distribution circuit, a voltage-controlled oscillator for supplying a signal having a suitable frequency as an input to the slope synthesizer, a phase error detector for detecting the phase difference between counter-electromotive voltages induced in the drive coils and the drive-coil energization switching signals in a driver-coil energization pause period, and an error amplifier for amplifying the output signal of the phase error detector and applying the amplified phase error signal as an input to the voltage-controlled oscillator.

REFERENCES:
patent: 4015180 (1977-03-01), Tetsugu et al.
patent: 4211964 (1980-07-01), Yabu et al.
patent: 4243921 (1981-01-01), Tamura et al.
patent: 4511830 (1985-04-01), Yamada et al.
patent: 4567409 (1986-01-01), Ogawa
patent: 4617675 (1986-10-01), Ashikaga et al.
patent: 4623827 (1986-11-01), Ito
patent: 4628460 (1986-12-01), Frederich

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