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US Army mechanic course - Wheeled Vehicle Electrical Systems

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Sample text

Each end of the rotor assumes a polarity. A multilobed segment is attached to each end of the rotor. The segment varies the reluctance in the magnetic circuit as it rotates. As a result, the fixed stator poles experience a variation in magnetic strength or coupling and produce a resulting output voltage in the stator coils. In contrast to other types of generators, the iron does not experience a flux reversal. Consequently, there is only a 50-percent use of iron in the stator. Advantages of an inductor alternator are easier winding construction for field and stator coils; simplified cooling; it is brushless; and it has an integral solid rotor without windings that permits high-speed operation.

The field winding or coils are positioned around two of the pole pieces, opposite to each other. This gives a four-pole action with only two field windings. The internal resistance is kept low because there are only two windings. When the starter switch is closed, current is passed through the two grounded brushes to the commutator, which is located on the armature shaft. The armature has a number of heavy wires wound around it in such a manner as to produce a magnetic field. After flowing through the armature windings, the current is directed through two insulated brushes to the two field windings and the pole pieces become magnetized.

The lines of force collapsing across the windings would induce a voltage into each turn of the coil's windings. Voltage induced into the primary winding is called self-induced voltage because the magnetic field was created by the primary winding in the first place. Voltage induced in the secondary winding is the result of what is called mutual induction. The secondary winding did nothing to create the magnetic field, but a voltage is induced into it because it is "mutually" located with the primary winding.

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