Overload protection for DC motor-driven linear actuator

Details Overload protection for DC motor-driven linear actuator Overload protection for DC motor-driven linear actuator

1987-09-01

1988-08-09

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

318475, 318434, 318266, 192150, 200 47, H02H 500

Patent

active

047632194

ABSTRACT:
A permanent magnet DC motor-driven linear actuator has a screw shaft supported against axial movement by a compressed spring. Excess thrust in one direction causes the shaft to move axially to open a first momentary switch, and excess thrust in the opposite direction similarly opens a second momentary switch. The switches are connected electrically in series with each other and with the motor, and enable the motor to stop whenever a mechanical overload is encountered regardless of the position of the actuator operating rod. Diodes connected across the switches in opposite directions allow reversal of the motor by reversing polarity of the DC supply, even when a switch is held open. In two of the embodiments of the invention, the swithes are double-throw switches, and additional diodes are connected from the normally open contacts of the switches to the opposite terminal of the motor to provide dynamic braking.

REFERENCES:
patent: 3078407 (1963-02-01), Schaefer
patent: 3435696 (1969-04-01), Carr
patent: 3460018 (1969-08-01), Cary
patent: 3523599 (1970-08-01), Denkowski
patent: 3851538 (1974-12-01), Denkowski et al.
patent: 3968705 (1976-07-01), Amano et al.

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