Electric motor control for conductor wrapping tool

Details Electric motor control for conductor wrapping tool Electric motor control for conductor wrapping tool

1978-06-26

1979-11-20

Smith, Jr., David

Electricity: motive power systems

Automatic and/or with time-delay means

Movement, position, or limit-of-travel

310 50, H02P 300

Patent

active

041752473

ABSTRACT:
A portable conductor wrapping tool having a rotary bit driven by an electric motor includes a motor control circuit in which a switch responsive to a magnetic field is disposed in proximity to a drive spindle for the bit and a magnet mounted on the tool housing. A magnetic flux shunt disposed on the spindle distorts the magnetic field of the magnet as the shunt passes through the field causing the switch to open to deenergize the motor and stop the bit and spindle in a predetermined position. The motor control circuit includes a solid state speed control device and a manually actuated switch which in a first position provides full power to the motor and in a second position supplies reduced power through the magnetic responsive switch.

REFERENCES:
patent: 3458793 (1969-07-01), Tsergas
patent: 3564376 (1971-02-01), Mais et al.
patent: 3654536 (1972-04-01), Miura

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