Worm gear motor with a built-in sensor

Details Worm gear motor with a built-in sensor Worm gear motor with a built-in sensor

1989-07-07

1991-04-02

Herrmann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

324174, F16H 116

Patent

active

050038362

ABSTRACT:
A worm gear for driving devices such as automobile power windows and power seats the operating positions of which have to be precisely determined. The worm gear motor has a built-in sensor means having a torque transmission plate engaged with a motor-driven worm wheel having an output shaft in its center and at least one circumferentially extending notch on the periphery, a magnet disposed on one side of the torque transmission plate along the path of the notch during rotation of the torque transmission plate and a magnetic sensor disposed on the other side of the torque transmission plate opposite the magnet. The sensor repeats ON-OFF cycles according to the presence or absence of the notch while said motor is in operation, detecting a predetermined rotational position of the output shaft by the signal attained by the sensor, and attaining a high positional determination of the motor output shaft regardless of backlash of engaged gears and mechanical inertia of the motor components.

REFERENCES:
patent: 2821185 (1958-01-01), McCarty et al.
patent: 3719841 (1973-03-01), Ritsema
patent: 4011476 (1977-03-01), Beard
patent: 4014301 (1977-03-01), Happel
patent: 4364011 (1982-12-01), Bloomfield et al.
patent: 4748865 (1988-06-01), Umezawa et al.
patent: 4756207 (1988-07-01), Bianchi et al.

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