Brushless motor with hall elements

Details Brushless motor with hall elements Brushless motor with hall elements

1989-09-21

1990-08-28

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 310DIG3, H02K 1100

Patent

active

049528300

ABSTRACT:
A brushless motor in which the Hall elements are mounted around a sub-magnet by means of a holder and a printed circuit board is disclosed. The holder comprises a semicircular disk-shaped base portion and a semicircular cylindrical extension portion extending therefrom to oppose the outer circumferential surface of the sub-magnet across a small radial gap, wherein a plurality of rectangular bores for accommodating the Hall elements are formed in the extension portion at a fixed circumferential pitch, each bore having an axial depth substantially greater than the length of Hall elements. The Hall elements accommodated in respective bores are sealed by an adhesive, and the semicircular disk-shaped printed circuit board is attached on the base portion of the holder by means of a mortice and tenon joint, to close the bores of the holder. The leads of the Hall elements are soldered to the printed circuit pattern formed on the back surface of the printed circuit board. The holder and the printed circuit board fixed to each other are mounted together to the rear bracket of the motor.

REFERENCES:
patent: 4011476 (1977-03-01), Beard
patent: 4259603 (1981-03-01), Uchiyama et al.
patent: 4482849 (1984-11-01), Doemen et al.
patent: 4638197 (1987-01-01), Kalagidis
patent: 4818907 (1989-04-01), Shirotori
patent: 4847527 (1989-07-01), Dohogne
Y. Dote and T. Konishita: "Fundamentals and Applications of Brushless Servo Motor", p. 45, Sogodenshi Shuppanasha (publication date unclear).

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