Question
Download Solution PDFWhich of the following motor is self-starting?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- Three-phase induction motor is self-starting, because winding displacement is 120 degrees for each phase and supply also has 120 phase shift for 3-phase.
- It results in a unidirectional rotating magnetic field is developed in air gap which causes 3-phase induction motor to self-start.
- The single-phase induction motor is non self-starting in nature.
- When single phase AC supply is given to stator winding of single-phase motor, it produces alternating flux i.e. which alternates along one space axis only.
- It is not synchronously revolving (or rotating) flux, thus it cannot produce any rotation. Hence single phase induction motor is not self-starting.
- To overcome this problem and to make the motor self-starting, it is temporarily converted into two-phase motor during starting.
- For this purpose, the stator of a single phase motor is provided with extra winding known as starting winding in addition to the main winding. These two winding are placed across the single phase supply.
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