Electricity: motive power systems – Induction motor systems – Secondary circuit control
Patent
1998-07-24
2000-04-18
Masih, Karen
Electricity: motive power systems
Induction motor systems
Secondary circuit control
318700, 318785, 318794, 318781, H02P 126
Patent
active
060519533
ABSTRACT:
A three phase AC motor which rotates at the synchronous speed determined by the number of poles of its main stator winding and the frequency of the AC input to it, which does not need any exciter machine or brushes to provide its DC field current, but has an internal, but independently adjustable excitation system to supply its field current. The internal excitation system consists of an auxiliary winding on the stator which is additional to the main power winding, another auxiliary winding on the rotor besides the main DC field winding, a diode rectifier circuit on the rotor from which the DC field current is supplied by rectification of the induced currents in the rotor auxiliary field. The field current adjustment can be made by adjustment of the input to the stator auxiliary winding. This can be done independently by eliminating any magnetic coupling between the main and auxiliary circuits. The elimination of the magnetic coupling between the main and auxiliary circuits is achieved by winding the auxiliary circuits for a suitably chosen pole number which is different from that of the main circuits. An optional damper winding will assist in starting when the machine is operated from a fixed frequency supply and ensure stability during steady state rotation. The machine is suitable for inverter fed adjustable speed drives and for fixed frequency operation. It can function in the motoring and the generating modes.
REFERENCES:
patent: 5012148 (1991-04-01), Vithayathil
patent: 5808441 (1998-09-01), Nehring
patent: 5844343 (1998-12-01), Horst
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