Summary:A Single Phase Motor has two primary types of windings: the main winding and the starting winding. The starting winding ...
A Single Phase Motor has two primary types of windings: the main winding and the starting winding. The starting winding has relatively few turns and is small in diameter. Both windings have their own characteristics and are used to produce torque. As the motor speeds up, the starting winding's resistance gradually decreases, and when the motor reaches full speed the main winding is used.
A Single Phase Motor works by exchanging single-phase AC current into two alternating magnetic fields. When this occurs, the single-coil produces two counter-rotating phasors, one of which coincides twice per revolution. At 90 degrees and 180 degrees, the phasors cancel, while the phasors are partially additive. The two phasors are rotated at different speeds, so that they produce double-frequency ripples.
Single Phase Motors use two phases of power: the main phase drives the rotor and the second phase produces a pulsating magnetic field. The main flux of a single-phase motor flows through the stator, which is magnetically coupled to the two alternating phases. The current produces a force called the torque, which enables the rotor to rotate.
Single Phase Motors also have a number of drawbacks. One drawback of this type is the auxiliary winding, which needs to be energized by an additional source. In some cases, a capacitor is connected in series with the auxiliary winding. This capacitor helps in regulating the speed of the motor, and when the motor reaches 75% or 80% of synchronous speed, it disconnects the capacitor and auxiliary winding. Single Phase Motors are often used in refrigerators, freezers, and heaters, and come in different sizes from 0.5 HP to 15 HP.
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