Why did the synchronous motor stop as soon as we set the speed of the prime mover to  2500 rpm then stopped?

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Q: find the sinusoid represented by the polar.

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Q: 51. What are the average and ms values of the square wave in Fig. 102? -I eycle- 10 a) FIG. 102

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Q: WHAT IS THE BANDWIDTH OF AN AM SIGNAL WHOSE CARRIER IS MODULATED BY 1KHZ 3KHZ AND 5KHZ…

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Q: What is/are the advantage/s of using lamps with a high value of CRI than that of low valued CRI?

A: CRI stands for color rendering index.  It is the ability to distinguish between the colours.

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Q: VDD R1 = 7.5 kQ R2 = 6.8 kQ R3 = 4.7 kQ Rc = 2.2 kQ RE = 1.2 kQ Vcc = 20 V B1 = B2 = 180 32 R2 Vi B1…

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Q: , calculate the resonance frequency of the following circuit,

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Q: autotransformer starter

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Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.