Speed control

Details Speed control Speed control

1976-05-03

1978-03-28

Hohauser, Herman J.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318227, 318231, 363 63, H02P 540

Patent

active

040817270

ABSTRACT:
Accurate induction motor speed control is accomplished by controlling the duty cycle of operation of high voltage switches which in turn drive the motor windings. For two phase operation logic circuitry generates two bipolar variable duty cycle waveforms with the off-time of each waveform being adjustable to vary motor speed. For single phase operation a single control waveform is generated. An initialization circuit is also provided and forms a part of the circuitry for converting the input AC line voltage to a DC voltage level useable by the high voltage switches. This initialization circuit controls the charging of capacitors of the AC to DC converter and provides efficient power transfer.

REFERENCES:
patent: 3680760 (1972-08-01), Costa et al.
patent: 3700987 (1972-10-01), Deering

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