Electric circuit with limit switches for limiting rotatable rang

Details Electric circuit with limit switches for limiting rotatable rang Electric circuit with limit switches for limiting rotatable rang

1989-06-28

1990-04-03

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318261, 318273, 318293, 318466, H02P 312, B60K 3100

Patent

active

049143620

ABSTRACT:
An electric circuit with limit-switch for limiting rotatable range of an output shaft of an electric drive unit disposed between an electric motor and a control device for supplying a drive current thereto, comprising a first snap action limit switch disposed on a first input terminal of the motor, and a second snap action limit switch disposed on a second input terminal of the motor, the limit switches having pivot points of movable contacts on a motor side, their normally-closed contacts being connected to an output side of the control device and their normally-open contacts being connected to a common connecting point, and the normally-closed contacts of the first limit switch is connected to the common connecting point through a diode in the direction allowing an electric current to flow from each of the normally-closed contacts toward the common connecting point, and further comprising a diode for allowing an electric current to flow in parallel to the second limit switch, bypassing between the normally-closed contact and the movable contact and flowing toward the motor.

REFERENCES:
patent: 2606312 (1952-08-01), Rogers
patent: 2912632 (1959-11-01), Turtil
patent: 2972103 (1961-02-01), Cunniff
patent: 3203447 (1965-08-01), Bremner et al.
patent: 4145640 (1979-03-01), Kipp et al.
patent: 4161994 (1979-07-01), Collonia
patent: 4362975 (1982-12-01), Orsini

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