Single Phase Motors

Chia sẻ: Nguyen Van Viet | Ngày: | Loại File: PPT | Số trang:3

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Single Phase Motors • Similar to a 3 phase induction motor with squirrel cage rotor and main stator windgs. Main wndgs Centrifugal switch Rotor Laminated stator slots Wndgs Start wndgs .Run (main) and Start (Aux) Windings • The stator has two

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Nội dung Text: Single Phase Motors

Single Phase Motors Rotor • Similar to a 3 phase induction motor with squirrel cage rotor and main stator windgs. Laminated stator slots Wndgs Centrifugal switch Main wndgs Start wndgs
Run (main) and Start (Aux) Windings • The stator has two sets of windgs, Run (which is of thicker size to reduce I²R losses) and Start of thinner size is placed 90˚ apart. • Run has relative Large number of turns. • Aux has relative Small number of turns.
Φm Starting Torque in Single phase motor Split Phase Principle • To produce a starting torque a rotating magnetic field must be produced. • This is done by including the Aux winding. • When an AC source is applied the main windg produce a flux Φ m while the Aux wndg produces a flux Φa Since the angles are out of phase a resultant rotating field is created • A centrifugal switch disconnects the Aux. wndg from the supply after it has run up to 75% of full speed.