Synchronous Motors:The Brushless Exciter

The Brushless Exciter

A second method of supplying excitation current to the rotor is with a brushless exciter. The brushless exciter has an advantage in that there are no brushes or slip rings to wear. The brushless exciter is basically a small three-phase alternator winding and three-phase rectifier located on the shaft of the rotor. Refer to the photo- graph in Figure 45 – 1. At the back of the rotor a small winding can be seen. This is the winding of the brush- less exciter. Electromagnets are placed on either side of the winding (Figure 45 – 3). A three-phase rectifier and fuses are also located on the rotor shaft. The rectifier converts the three-phase alternating current produced



in the alternator winding into direct current before it is supplied to the rotor winding (Figure 45 – 4). The amount of excitation current supplied to the rotor winding is controlled by the amount of direct current sup- plied to the electromagnets. The output voltage of the alternator winding is controlled by the flux density of the pole pieces.

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Ahmed Farahat is EECS engineer With 18 years of experience in the field he worked on different technological discipline and and had honored Post Graduate Diploma In Computer Science And Engineering

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