DC brushless motor with solid rotor having permanent magnet

Details DC brushless motor with solid rotor having permanent magnet DC brushless motor with solid rotor having permanent magnet

1991-03-29

1993-06-29

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 42, 310181, 310262, 29598, H02K 1503, H02K 1506, H02K 0127

Patent

active

052237591

ABSTRACT:
A DC brushless motor which includes a hollow cylindrical stator (2) having a plurality of exciting coils (6) secured to an inside thereof; a solid cylindrical rotor (7) provided within the stator and having at least two permanent magnets (30) therein so as to form a magnetic circuit with the stator; a rotary shaft (8) secured concentrically with said rotor; and a pair of bearings (10, 12) secured to opposite ends of the stator for supporting the rotary shaft for rotation. The permanent magnet is placed between a pair of high permeability yoke portions or pole pieces each extending in a radial direction to form a magnetic circuit and made of a rare earth element-transition metal-boron alloy.

REFERENCES:
patent: 3375385 (1968-03-01), Young
patent: 3492520 (1970-01-01), Yates
patent: 4139790 (1979-02-01), Steen
patent: 4144469 (1979-03-01), Miyashita et al.
patent: 4159434 (1979-06-01), Kalsi
patent: 4322648 (1982-03-01), Ray et al.
patent: 4469970 (1084-09-01), Neumann
patent: 4568846 (1986-02-01), Kapadia
patent: 4658165 (1987-04-01), Vandershaeghe
patent: 4760300 (1988-07-01), Yoshida et al.
patent: 4795936 (1989-01-01), Crosetto et al.
patent: 4845837 (1989-07-01), Lloyd
patent: 4981635 (1991-01-01), Yamashita et al.
patent: 5006045 (1991-04-01), Shimoda et al.

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