Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-07-22
1994-12-20
Skudy, R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310154, 310207, 310266, H02K 300
Patent
active
053748670
ABSTRACT:
A coreless motor has a permanent magnet integrated with a casing, a commutator, and a rotor coil unit integrated with an output shaft. The rotor coil unit is comprised of an integral number of coil blocks superposed with one another. Respective coil blocks have a displacement angle of X.sub.M =360.times.M
degrees relative to a reference coil block, wherein X.sub.M denotes the displacement angle of the Mth coil block relative to the reference block, M denotes a positive integer from 1 to n-1 (the Mth coil block relative to the reference block), and n represents the number of coil blocks and is an even integer having a value of 4 or more. Each coil block shares a center angle of X.sub.2 +360/P degrees, wherein X.sub.2 denotes the displacement angle of the second coil block relative to the reference block, and P denotes the number of poles of the permanent magnet. The coil blocks are connected in series to form respective phases of the rotor coil blocks such that the rotor coil blocks of each phase pass an electric current in the same direction. By this construction, the coreless motor has an even number of coil blocks superposed with one another at a predetermined displacement angle and, as a result, the coreless motor can produce a higher output torque through a series connection of coils and has a reduced number of junction nodes as compared to a motor utilizing a parallel connection.
REFERENCES:
patent: 4060746 (1977-11-01), Heraud
patent: 4370581 (1983-01-01), Nakamura
patent: 4412146 (1983-10-01), Futterer
patent: 4437029 (1984-03-01), Ban
patent: 4583016 (1986-04-01), Ban
patent: 5270602 (1993-12-01), Takehara
Adams Bruce L.
Seiko Instruments Inc.
Skudy R.
Wilke Van C.
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