Apparatus for controlling the rotors of synchronous motors

Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Synchronizing or phasing control

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318175, 318625, H02P 736

Patent

active

040991032

ABSTRACT:
A device for measuring the angular position of the rotor of a synchronous motor relative to the rotating field thereof wherein the synchronous motor is driven by a frequency generator. The synchronous motor has an optoelectronic device generating a pulse for each rotation of the rotor and applied to the stop input of a counter whose start input receives from a frequency divider connected to the frequency generator and having a dividing factor equal to the number of poles of the synchronous motor. A frequency multiplier is also connected to the frequency generator and the output of the multiplier is applied to the counting-pulse input of the counter. The count registered on the counter in the interval between start and stop pulses is thus proportional to the lag of the rotor behind the rotating field.

REFERENCES:
patent: 3675098 (1972-07-01), Heiberger
patent: 3694716 (1972-09-01), Eland
patent: 3803464 (1974-04-01), Kuroyanagi
patent: 3833843 (1974-09-01), Bossons
patent: 3997828 (1976-12-01), Bottcher et al.

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