Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1989-06-29
1991-08-20
Roskoski, Bernard
Electricity: motive power systems
Switched reluctance motor commutation control
318138, H02P 602
Patent
active
050417690
ABSTRACT:
A dc motor apparatus with an index signal output comprises: a dc motor including: a stator having driving coils; a rotor having plural pairs of magnetic poles; plural magnetic sensors provided to the stator for sensing magnetic flux from the plural magnetic poles, one of the sensors producing a first signal; and a driving circuit responsive to output signals of the plural magnetic sensors for producing drive signals to energize the driving coils; and one of the magnetic poles magnetized to exhibit a different intensity of magnetic flux density from that of remaining poles; a peak level detecting circuit responsive to the first signal for detecting a peak level thereof and holding it for a predetermined interval to produce a reference signal; and comparing circuit for producing a second signal when the first signal has a predetermined relationship with the reference signal n. A level of the reference signal is changed in accordance with a detected peak level of the signal of the magnetic sensors to generate an index signal stably.
REFERENCES:
patent: 4228396 (1980-10-01), Palombo et al.
patent: 4680515 (1987-07-01), Crook
patent: 4717864 (1988-02-01), Fultz
patent: 4899093 (1990-02-01), Gleim
Roskoski Bernard
Victor Company of Japan Ltd.
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