Sleeve type of coreless motor with reduced starting current

Details Sleeve type of coreless motor with reduced starting current Sleeve type of coreless motor with reduced starting current

1996-11-26

1998-12-08

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310154, 310198, 310203, 310261, 310266, H02K 100, H02K 300

Patent

active

058474846

ABSTRACT:
According to the present invention, a coreless motor is provided, which comprises: a stator having a circular slot therein, magnets on a wall of the slot, two brushes attached thereto, and metals, which are arranged concentrically; and a rotor having a shaft rotatably supported by the metals, a coil assembly, and a commutator arranged around the shaft, the coil assembly having successive 1st to Nth coils in the slot confronting the magnets and (N+1) taps and a commutator including segments respectively connected to the (N+1) taps, the first to Nth coils connected to the segments through the (N+1) taps respectively, the two brushes selectively contacting with two of the segments successively. The 1st-Nth coils have a sleeve form and each has a rectangular winding pattern, the 1st-Nth coils and the (N+1) taps form a continuous wire, and a coil opening angle is substantially 180.degree. and a coil pitch is 180.degree./(N+1) to 360.degree./(N+1). Open end coils may be provided both ends of 1st-Nth coils to provide loop form taps. The coils may be formed of a high tensile force strength wire. That is, the coils may comprise an alloy including at least copper and silver and having a resistivity from 2.mu..OMEGA..multidot.cm to 3.5.mu..OMEGA..multidot.cm and a tensile force strength from 200 N/mm.sup.2 to 500 N/mm.sup.2.

REFERENCES:
patent: 3793548 (1974-02-01), Faulhaber
patent: 4327304 (1982-04-01), Aoki
patent: 4373256 (1983-02-01), Nakamura
patent: 4463276 (1984-07-01), Nakamura
patent: 5036239 (1991-07-01), Yamaguchi
patent: 5270602 (1993-12-01), Takehara

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