How does the generator work and why is the frequency corresponding to 3000rpm 50Hz?-Shaanxi Wanpeng Power Technology

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How does the generator work and why is the frequency corresponding to 3000rpm 50Hz?

Category：industry news Time： 2025-01-16 Author：万澎动力

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Do you know how a generator works? Wanpeng Power takes you into the knowledge classroom.

How does the generator work and why is the frequency corresponding to 3000rpm 50Hz? The generator is mainly composed of two parts: stator and rotor. There are three-phase windings AX, BY and CZ on the stator, with an electrical angle of 120° between each other, and the number of turns in each winding is equal. The rotor pole is equipped with an excitation winding. Through DC excitation, its magnetic flux direction comes out from the rotor N pole, passes through the air gap, stator core, and air gap, and then enters the rotor S pole to form a loop (shown in the dotted line in the figure). Assuming that the steam turbine pulls the generator rotor to rotate in a counterclockwise direction at a speed n, the magnetic field will cut the stator conductors. From the law of electromagnetic induction, Potential e=Esinωt. E is the sine wave potential. Large values, ω=2πf, f is the frequency of the potential, and t is time. Assuming that the initial phase angle of phase A potential is 0°, the instantaneous value of the three-phase potential is: eA=Esinωt eB=Esin（ωt-120°） eC=Esin（ωt-240°） Suppose a generator has p pairs of poles and the rotor speed per minute is n, then the rotor rotates n/60 revolutions per second, and the induced potential alternates pn/60 times per second, and the frequency f=pn/60. The pole number of a turbogenerator is 1, so when n=3000rpm, f=50Hz. If you want to learn more, you can continue to pay attention to Wanpeng Power, the generator manufacturer around you.

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