Electricity: motive power systems – Induction motor systems – Secondary circuit control
Reexamination Certificate
2005-12-20
2005-12-20
Martin, David (Department: 2837)
Electricity: motive power systems
Induction motor systems
Secondary circuit control
C318S778000, C318S786000, C318S819000, C318S818000
Reexamination Certificate
active
06977478
ABSTRACT:
A controller is provided for transitioning a drive signal to a single phase motor between a square wave and pulse width modulation modes, wherein the drive signal is in square wave mode at low motor frequencies and in pulse width modulation mode during normal operation. The transitioning includes using a real time motor model to effectuate transition of the drive signal between the modes, and a sampling rate for sampling the real time motor model during the transitioning. The sampling rate is automatically modified during the transitioning, wherein acceleration of the motor includes transitioning the drive signal from square wave mode to pulse width modulation mode, including periodically increasing the sampling rate during the transitioning. Conversely, when transitioning from pulse width modulation mode to square wave mode, the controller automatically deaccelerates the sampling rate during the transitioning.
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Biamonte Jeffrey R.
Trifilo Timothy M.
Esq. Lily Neff
Heslin Rothenberg Farley & & Mesiti P.C.
Hiruy Elias B.
Martin David
Radigan, Esq. Kevin P.
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