Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1975-06-20
1977-03-29
Rubinson, Gene Z.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318230, 318410, 318414, H02P 540
Patent
active
040151786
ABSTRACT:
A reference value transmitter for a phase clipping or cutting control for starting a squirrel cage-asynchronous motor, comprising a start-up regulator for the upward regulation of a reference value transmitter- output voltage from a start-up voltage value which is constant during a primary start-up phase to a rated voltage value with a predetermined build-up speed during a terminal start-up phase. The start-up regulator is constructed for triggering the terminal start-up phase by means of a command signal and for the start-up regulator there is provided a command transmitter which contains a current measuring device for the motor current and a threshold value or limit indicator connected with the current measuring device for generating the command signal. By means of the threshold value of the threshold value indicator there is determined the intensity of the motor current during the pull-out rotational speed and which motor current amounts to a predetermined fraction of the motor current intensity at the start of the primary start-up phase.
REFERENCES:
patent: 3189810 (1965-06-01), MacGregor
patent: 3573580 (1971-04-01), Shinozaki
Phillot Charles
Unterweger Heinz
Rubinson Gene Z.
Sprecher & Schuh AG
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