Synchronous Motor Under Excitation
In synchronous motors the excitation is supplied by a separate direct current source either as a separate motor-generator M-G set or as an exciter mounted directly on the motor shaft. The power factor for motors is rated as lagging unity or leading.
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The current can be made to lead by various degrees by varying the magnitude of the field strength.
. As the mechanical load on a synchronous motor increases the stator current increases regardless of the field excitation. Using alternating current the. The synchronous Impedance is constant.
The excitation system is mainly classified into three types DC. In other words excitation system is defined as the system which is used for the production of the flux by passing current in the field winding. The synchronous impedance is determined from the OCC and SCC.
The flux under test conditions is the same as that under load conditions. The system which is used for providing the necessary field current to the rotor winding of the synchronous machine such type of system is called an excitation system. It is the ratio of the open-circuit voltage to the short circuit current.
The AC motor commonly consists of two basic parts an outside stator having coils supplied with alternating current to produce a rotating magnetic field and an inside rotor attached to the output shaft producing a second rotating magnetic field. A PMSM is a type of synchronous motor which is utilized as a permanent magnet for the development of the excitation field. For both under and over excited motors the power factor pf tends to approach unity with increase in mechanical load.
When the OCC and SCC are linear the synchronous impedance Z S is constant. An AC motor is an electric motor driven by an alternating current AC. The rotor magnetic field may be produced by permanent.
This is also called a brushless type of permanent sine wave motor because it generates a sine shape of flux distribution in the air gap between rotor and stator components.
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