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Basic knowledge about the motor (1)

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Basic knowledge about the motor (1)


1. The current of the single-phase transformer at no load is different from the main flux, and there is a phase angle difference aFe because of the iron current. In addition, the no-load current is a cusp waveform because there is a larger third harmonic.


2. The AC flows in the armature winding of the DC motor. However, the current flowing in the field winding is a direct current. The excitation mode of the DC motor includes other excitation, shunt excitation, series excitation, and compound excitation.


3. The back EMF expression of the DC motor is E = CE F n, and the electromagnetic torque expression is Tem = CTFI.


4. The number of parallel branches of a DC motor is always paired. The number of parallel branches of the AC winding is not necessarily the same.

 

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Pub Time : 2019-04-24 08:46:41 >> News list
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