Method of controlling the speed of a drill, hammer-drill, or rot

Details Method of controlling the speed of a drill, hammer-drill, or rot Method of controlling the speed of a drill, hammer-drill, or rot

1981-02-04

1984-06-12

Truhe, J. V.

Electricity: motive power systems

Motor-reversing

Field circuit control

318400, 318484, H02P 516

Patent

active

044544596

ABSTRACT:
The invention is directed to a method and apparatus for controlling the speed of an electronically controlled drill, hammer-drill or rotary hammer driven by an electrical motor wherein the rotational speed is first raised from zero to a predetermined start-drill speed and thereafter, from the start-drill speed up to the working speed. The rotational speed is held automatically at the start-drill speed for a predetermined time interval. The speed of the motor is sensed by a speed sensing device which includes a magnet ring coupled to the output shaft of the motor and a sensor positioned adjacent the periphery of the magnet ring. The speed control circuitry of the invention is housed within a casing which includes a depending portion for supporting the sensor in the proper operative position relative to the magnet ring.

REFERENCES:
patent: 3231809 (1966-01-01), Greer
patent: 3753066 (1973-08-01), Sailer
patent: 3835357 (1974-09-01), Holzer
patent: 4042966 (1977-08-01), Newell et al.
patent: 4249118 (1981-02-01), Roof

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