A number of motors of comparatively small ratings are manufactured for operation on single phase ac supply. Most of them, built in fractional horse power sizes, are technically termed as “small motors, a small motor being defined as ‘a motor built in a frame smaller than having a continuous rating of 1hp” An induction of the number of such motors can be had from the fact that the sum of total of all fractional-horse power motors in use to-day far exceeds the total of integral horse power motors of all types. Single phase motors perform a great variety of useful services in the home, the office, the factory, in business establishment, on the farm and many other numerous applications where electricity is available. These find interesting applications in automatic control devices of various types. Since the requirements of the numerous applications differ so widely, the motor-manufacturing industry has developed several types of such motors, each type having operating characteristics that meet define demands.
Single phase ac motors may be divided into three general classes namely
(i) Induction Motors
(ii) Commutator Motors
(iii) Synchronous Motors.
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