Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1979-07-02
1983-10-11
Truhe, J. V.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318440, 318778, 307 87, H02P 142
Patent
active
044095333
ABSTRACT:
A frequency detector produces a pulse train from an emf generated across a three-phase induction motor in the decelerating mode with its pulse repetition frequency proportional to the speed of the motor. A phase locked loop synchronizes this frequency with that of a variable frequency oscillator for a variable frequency inverter and the synchronization is maintained by the phase locked loop and a ramp generator controlled with the signal from the detector. When the detected frequency equals a command frequency from a reference circuit, the inverter starts to operate the motor. When the start operation has been completed, the phase locked loop is disabled while the ramp generator is connected to the reference circuit to change the frequency of the inverter to the command frequency to complete the restart operation of the motor.
REFERENCES:
patent: 3262037 (1966-07-01), McCabe et al.
patent: 3753002 (1973-08-01), Jacobson et al.
patent: 3824406 (1974-07-01), Ellis
patent: 3863123 (1975-01-01), Godard et al.
patent: 3932764 (1976-01-01), Corey
patent: 3991319 (1976-11-01), Servos et al.
patent: 4195233 (1980-03-01), Udvardi-Lakos
"Large Adjustable Speed Fan Drives Including Static Converter Developments for Cement Plants", J. R. Eliason, B. S. Fisher, IEEE Transactions on Industry Applications, vol. IA-13, No. 6, Nov./Dec. 1977, pp. 557-562.
Mitsubishi Denki & Kabushiki Kaisha
Moose Richard M.
Truhe J. V.
LandOfFree
Method of restarting induction motor and apparatus for carrying does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of restarting induction motor and apparatus for carrying , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of restarting induction motor and apparatus for carrying will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1278064