Hand held variable speed drill motor and control system therefor

Details Hand held variable speed drill motor and control system therefor Hand held variable speed drill motor and control system therefor

1975-06-18

1977-10-04

Schaefer, Robert K.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318230, 318231, 32DIG8, H02P 324

Patent

active

040526496

ABSTRACT:
A high speed hand held polyphase motor and a control system therefor is disclosed. The motor is of the induction type, designed for use in oral surgery and the like. The control system includes a bridge type inverter having a separate pair of solid state switching devices such as transistors connected in a bridge configuration across a pair of direct current power supply conductors for each phase winding of the motor. A switch control circuit is connected between the solid state switches and a variable frequency clock signal generator for turning the switches of each pair on and off in a given phase sequence to provide three phase current for the motor windings. The speed of the motor is proportional to the clock signal frequency. A voltage regulating circuit is connected between the power supply conductors and a source of direct current voltage to supply a direct current voltage across the supply conductors which varies in accordance with the clock signal frequency over a pre-established range. The control system further includes a torque demand adjustment circuit coupled to the voltage regulating circuit to permit the voltage across the supply conductors to be independently adjusted over a preset range of clock signal frequency.

REFERENCES:
patent: 1189184 (1916-06-01), Whiteside
patent: 2242812 (1941-05-01), Brown
patent: 3281645 (1966-10-01), Spink
patent: 3355654 (1967-11-01), Risberg
patent: 3365638 (1968-01-01), Risberg
patent: 3416057 (1968-12-01), Froyd et al.

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