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Class Information
Number: 318/780
Name: Electricity: motive power systems > Induction motor systems > Primary circuit control > Starting control > Three phase motor with variable transformer to initially adjust voltage to motor windings
Description: Subject matter wherein the circuit includes transformer means to enable the application of a voltage value for starting which is different from the voltage applied during running of a three phase motor.


Patents under this class:

Patent Number Title Of Patent Date Issued
7525264 Shunt regulation apparatus, systems, and methods Apr. 28, 2009
6940249 Inverter device Sep. 6, 2005
6841967 Coil winding number variable type motor and coil winding number varying method for varying cooling and heating capacity of reciprocating compressor Jan. 11, 2005
6049284 Method and zero-speed monitor for monitoring a three-phase machine Apr. 11, 2000
5721478 Process and device for supplying a polyphase electric motor during startup Feb. 24, 1998
5598079 A.C. induction devices having tuned compound windings Jan. 28, 1997
5500582 Multiphase load control system with switch connected split sources of phase voltage Mar. 19, 1996
5130628 Transformer providing two multiple phase outputs out of phase with each other, and pumping system using the same Jul. 14, 1992
4935686 Ac motor drive with switched autotransformer coupling Jun. 19, 1990
4371823 Apparatus and method for starting textile winder synchronous motor drives Feb. 1, 1983
4330740 Energizing circuit for providing low voltage starting for submersible pump motor May. 18, 1982
4320328 Apparatus for full voltage start of vibratory excitors Mar. 16, 1982



 
 
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