Digital drive circuit for electric motor or the like

Details Digital drive circuit for electric motor or the like Digital drive circuit for electric motor or the like

1978-12-18

1981-02-03

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, 318318, 180179, H02P 516

Patent

active

042491193

ABSTRACT:
A digital drive current for application to a variable-speed electric motor is generated from a binary signal including N high-order bits and n low-order bits. A pulse waveform of fixed frequency higher than the frequency to which the motor can respond is generated to have a pulse width duty cycle in accordance with the value of the high-order bits. The low-order bits are used to make a one-step increase in the width of a proportion, determined by the value of the low-order bits, of the pulses of the pulse waveform, so that the average pulse width is increased a desired fraction of one step.

REFERENCES:
patent: 3278727 (1966-10-01), Geis
patent: 3840815 (1974-10-01), Masters
patent: 3937932 (1976-02-01), Ahlgren
patent: 3950682 (1976-04-01), Dohanich, Jr.
patent: 4165490 (1979-08-01), Howe, Jr. et al.

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