Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1995-12-13
1998-06-30
Cabeca, John W.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388814, 378 94, 378112, 378131, 318458, 318809, H05G 134
Patent
active
057746257
ABSTRACT:
The invention relates to an X-ray apparatus, comprising a rotary-anode X-ray tube, a device for monitoring the rotational speed of a rotary-anode drive motor of the X-ray tube, a sensor circuit for determining an angle signal which is dependent on the phase angle between a reference voltage and a current associated with the motor, a comparator circuit for detecting the angle signal variation which serves as a criterion for the rotational speed of the motor, and also comprising a frequency changer. Thanks to the fact that there is provided a device for forming a brief keying signal so as to trigger a reduction of the frequency of the rotary-anode drive motor, the device is also suitable for induction motors in which only a small phase angle variation is measured between standstill and the operating rotational speed.
REFERENCES:
patent: 4355276 (1982-10-01), Vittay
patent: 5010287 (1991-04-01), Mukai et al.
patent: 5140246 (1992-08-01), Rarick
patent: 5212437 (1993-05-01), Hescht et al.
Cabeca John W.
Slobod Jack D.
U.S. Philips Corporation
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