H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/108
H02P 21/10 (2006.01)
Patent
CA 1151724
ABSTRACT A control unit for regulating an asynchronous motor supplied with power from a three phase network by a line-controlled power converter which is DC coupled to a self-commutated inverter has a function generator and a current regulator which controls the stator current of the motor by the con- trolling rectifier valves in the inverter. Control of the stator current is a function of a predeterminable valve of flux fed into the function gener- rator. In a parallel control system, an actual-value computer and a load state control regulate the stator frequency by generating a signal for controlling the self-commutating converter as a function of the actual values of the stator current, the stator voltage, and a value calculated from the function generator input variable. The computer forms signals corresponding to the amplitude of the flux vector, and to a stator current component perpendicular to the flux vector. A variable derived from the predeterminable variable is applied to the load state control as a reference value. Fall-out-proof, low oscillation, speed control is effected from low angles to nearly 90°.
351964
Blaschke Felix
Reng Leonhard
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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