Abstract
This chapter provides an account of various types of motors. There are three types of motors: asynchronous or induction motors, synchronous motors, and schrage or commutator motors. There are several variations of these types. The synchronous motor, consisting of an alternating current (AC) winding and a direct current (DC) field system, runs at synchronous speed. It is used for AC electric propulsion schemes; however, it is not used for auxiliary purposes. The commutator motor is a variable speed machine, speed variation being obtained by altering the commutator brush positions. It is not in general use for auxiliary purposes. The induction motor is used in ships. It might be of the cage type or of the wound-rotor (slipring) type. The cage machine is a constant speed machine; however, its speed varies according to the load. The commonest form has a simple cage winding; however, it is also made with a double cage.
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