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Electrical Machine Design by V. S. Nagarajan, V. Rajini

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5

DESIGN OF SINGLE-PHASE INDUCTION MOTOR

5.1 Introduction

Single-phase induction motors are extensively used for domestic, office and agricultural applications such as fans, mixers, refrigerators, washing machines, machine tools, etc. These motors are generally available in fractional horse power ranges. These motors have no inherent starting torque and so are equipped with some starting mechanisms. Depending upon the starting mechanism, there are many types of single-phase induction motors available in the market. They also have a poor power factor and efficiency compared to their three-phase counterparts. For the same frame size, the power output of single-phase induction motor is only 50% of that of three-phase induction motor.

5.2 Construction ...

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