Brushless motor

Details Brushless motor Brushless motor

1991-07-26

1992-10-20

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318430, H02P 118

Patent

active

051573113

ABSTRACT:
A brushless motor includes a rotor having permanent magnets and a coil for rotating the rotor. In the motor, a switching element is connected between the coil and a power source, a magnetic sensor is provided for detecting the position of one of the permanent magnets of the rotor to control the switching operation of the switching element, and a delay circuit is provided for delaying a signal from the magnetic sensor and then applying the delayed signal to the switching element.
With this arrangement, the apparent hysteresis width of the magnetic sensor can be broadened and the prior art problem is avoided wherein variations in the hysteresis width of the magnetic sensor results in disabled rotation of the rotor.

REFERENCES:
patent: 3909690 (1975-09-01), Sugiura
patent: 4429262 (1984-01-01), Utenick
patent: 4525657 (1985-06-01), Nakase et al.
patent: 4584505 (1986-04-01), Chung et al.
patent: 4631459 (1986-12-01), Fujioka et al.
patent: 4686437 (1987-08-01), Langley et al.
patent: 4879498 (1989-11-01), Shinohara et al.
patent: 4897583 (1990-01-01), Rees
patent: 4978895 (1990-12-01), Schwarz
patent: 5036264 (1991-07-01), Ueki

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