Brushless motor speed detecting apparatus for reducing generatio

Details Brushless motor speed detecting apparatus for reducing generatio Brushless motor speed detecting apparatus for reducing generatio

1996-01-11

1997-11-18

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including motor current or voltage sensor

324160, H02P 602, G01P 346, G01P 342

Patent

active

056891814

ABSTRACT:
A brushless motor speed detecting apparatus includes a stator having three-phase driving coils which are energized reciprocally in the positive and negative directions, a rotor having magnetic poles, three position detectors for obtaining three-phase output signals corresponding to the rotation of the rotor, a first synthesizing circuit for synthesizing the output signals of the three position detectors, mode switching circuit for forming an energizing mode switching signal according to the output signal of the first synthesizing circuit, a driving circuit for supplying currents to the driving coils by switching an energizing mode from a first energizing mode to a second energizing and vice versa according to the output signal of the mode switching circuit, and a second synthesizing circuit for synthesizing a speed signal by detecting in the non-energizing section of the first energizing mode the induced electromotive voltages generated in the driving coils as the rotor rotates to base the synthesis of the speed signal on the induced electromotive voltages.

REFERENCES:
patent: 4847555 (1989-07-01), Stammer et al.

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