Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1980-12-24
1983-02-01
Dobeck, B.
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318723, 318780, H02P 104
Patent
active
043718230
ABSTRACT:
An apparatus and method for accelerating textile winder synchronous motor drives from standstill to rated running speed wherein a synchronous motor is first accelerated asynchronously to a first intermediate speed, then decelerated to and synchronized at a second intermediate speed, then accelerated synchronously to rated speed, while thereby limiting current drawn by the motor to levels not exceeding rated current. The method is automatically followed using apparatus which varies motor input frequency responsive to a predetermined sequence of control signals supplied from a signal source via a transient response profiler which converts sudden changes in signal strength to smooth, gradual changes. As more specifically described herein, only two controllers are needed, and a switching network including time-delay devices selectively supplies one signal or the other via an integrator to a variable frequency converter.
REFERENCES:
patent: 2852726 (1958-09-01), Ocnaschek
patent: 3307092 (1967-02-01), Trocchio
patent: 3787724 (1974-01-01), Pederson et al.
ASEA-Zeitschrift 1976, Jahrg. 21, Heft 4, pp. 75-80.
Barmag Barmer Maschinenfabrik AG
Dobeck B.
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