H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/108, 321/24
H02P 1/26 (2006.01) H02P 7/36 (1985.01)
Patent
CA 1197553
TRANSITIONING BETWEEN MULTIPLE MODES OF INVERTER CONTROL IN A LOAD COMMUTATED INVERTER MOTOR DRIVE Abstract of the Disclosure The load side converter or inverter in a load commutated inverter motor drive, including a source side AC to DC converter coupled to a DC to AC converter via a DC link circuit, is adapted to have at least three and preferably four modes of operation for bringing an AC motor load, and more particularly a synchronous motor, up to speed. In the preferred embodiment, the first mode constitutes an idle mode wherein the converter thyristors are maintained in a non-conducting state until commanded for normal operation. The second mode constitutes an initial start-up mode which assumes no knowledge of initial rotor position of the motor and simply utilizes a fixed low frequency firing signal to sequentially gate the thyristors using forced commutation to commutate the off-going thyristor. Thirdly, a second type of forced commutation mode is next entered into where the inverter frequency is synchronized to the rotor of the motor by sensing pseudo-flux waveforms until 5% to 10% of rated motor speed is achieved whereupon a fourth mode is entered into which comprises a self-commutation mode utilizing a phase lock loop operation using pseudo-flux wave zero crossings as synchronizing signals. In the three mode embodiment, the third mode is eliminated and the second mode modified to vary the load side converter frequency on a time basis until reaching some preset value (e.g., five (5) to fifteen (15) percent of motor rated frequency) at which time transition is made to the self-commutation mode.
426553
Chausse Burnette P.
Espelage Paul M.
Lippitt David L.
Tupper Leland C.
Company General Electric
Eckersley Raymond A.
LandOfFree
Transitioning between multiple modes of inverter control in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transitioning between multiple modes of inverter control in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transitioning between multiple modes of inverter control in... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1286981