Switching arrangement for controlling the rpm of electric motors

Details Switching arrangement for controlling the rpm of electric motors Switching arrangement for controlling the rpm of electric motors

1995-03-08

1997-07-08

Sircus, Brian

Electricity: motive power systems

Induction motor systems

Primary circuit control

388840, 388813, 318244, G05F 502

Patent

active

056464975

ABSTRACT:
A switching arrangement for controlling the rpm constancy between idling and full power of universal motors in electric tools has a phase-shift control (IC) which, for setting the set value, is connected at an output via an adjusting resistor with a tap of a voltage divider, and whose trigger output controls an electronic power switch disposed in the electrical circuit of the motor. In order to obtain an optimal readjustment of the load in the entire provided rpm range by means of such a switching arrangement, it is provided that between the tap of the voltage divider and the one output of the phase-control circuit (IC) at least one further adjusting resistor is provided, with which a preferably electronic circuit device is switched in parallel, which is controlled from a point in the voltage divider.

REFERENCES:
patent: 4703248 (1987-10-01), Kuhnemundt et al.

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