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US 4,093,882 AGranted
Coreless motor
AssigneeOlympus Optical Co., Ltd.
InventorKenji Furuta
Life of this patent
Estimating the term…
Abstract
Disclosed is a coreless motor comprising a rotor having a plurality of flat-type loop coils arranged on a rotor substrate, a motor housing having a journal bearing for rotatably supporting said rotor, and a stator which includes a pair of permanent magnets disposed facing said rotor in said motor housing, characterized in that the angle .theta. of said flat-type loop coil flared toward itself from the rotor axis is so set as to satisfy the inequality: ##EQU1## WHERE N IS THE NUMBER OF POLE MEMBERS OF A COMMUTATOR AND 2P IS THE NUMBER OF MAGNETIC POLE MEMBERS OF A STATOR.
Claims9
A coreless motor comprising:
- a rotary shaft,
- a rotor mounted on said rotary shaft and having a rotor substrate and a plurality of flat type loop coils disposed on the rotor substrate,
- a motor housing including a magnetic yoke made of a magnetic material and having at least two spaced journal bearings for rotatably supporting said rotary shaft,
- a stator including a pair of permanent magnetic poles opposed to said rotor within said housing so as to provide a closed magnetic flux path in which a magnetic flux emanated from one pole of said pair of permanent magnetic poles passes through said rotor and yoke and enters into the other pole, and
- a generally cylindrical thrusting magnetic member attached to said rotor and being located in a space between said rotary shaft and said permanent magnetic poles, said magnetic member being displaceable axially of said rotor by a magnetic flux produced by said permanent magnetic poles of said stator so as to be thrusted toward either of said at least two journal bearings.
2 more elements
Dependencies are inferred from the claim text.