Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1995-11-30
1997-08-05
Martin, David S.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388814, 388908, 388813, G05F 110
Patent
active
056550545
ABSTRACT:
A device for detecting the speed of a plural-phase motor in which a speed deviation occurring every m periods is eliminated, to provide a speed detection signal high in accuracy at low cost. The motor speed detecting device in which, among drive signals driving a plural-phase motor, m-phase drive signals (where m is a natural number which is not less than two (2) and equal to or smaller than the number of phases of said motor) are detected, and combined to form a signal, comprises a frequency divider adapted to subject the signal thus formed to 1/(m.times.n) frequency division (where n is a natural number).
REFERENCES:
patent: 3987350 (1976-10-01), Pomella et al.
patent: 3992657 (1976-11-01), Akamatsu
patent: 4114075 (1978-09-01), Minakuchi
patent: 4158801 (1979-06-01), Hirata
patent: 4338558 (1982-07-01), Okamatsu
patent: 4498034 (1985-02-01), Shirakawa
patent: 4773616 (1988-09-01), Abe
Kabushiki Kaisha Sankyo Seiki Seisakusho
Martin David S.
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