Position detector of a brushless motor

Details Position detector of a brushless motor Position detector of a brushless motor

1995-11-03

1997-11-11

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 310156, 318254, 318138, H02K 2906, H02P 616

Patent

active

056867700

ABSTRACT:
The magnetic pole 16b for positional detection is attached to the magnetic pole 16a for driving of the rotor magnet 16 at a position shifted from the magnetic center C of the magnetic pole for driving by an electrical angle of about 30.degree.. Due to the foregoing, the magnetic detector for driving is used as a magnetic detector for positional detection, so that the position detecting signal "c" can be obtained in a good condition. Therefore, it is unnecessary to provide a magnetic detector and a magnet piece which are conventionally used, so that the cost can be reduced, and it is also unnecessary to attach the magnet piece and the magnetic detector onto the base board. Accordingly, the manufacturing cost can be reduced, and further it is not required to maintain a space for installing the magnetic detector and the wiring thereof. In this way, it is possible to reduce the dimensions of the motor.

REFERENCES:
patent: 4639648 (1987-01-01), Sakamoto
patent: 4658190 (1987-04-01), Miyazaki et al.
patent: 4918346 (1990-04-01), Tajima et al.
patent: 4968913 (1990-11-01), Sakamoto
patent: 5041769 (1991-08-01), Iwai
patent: 5552682 (1996-09-01), Ushikoshi

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