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T William Hunt
Contents • • • • • • • Introduction to Single Phase Induction Motors As the name suggests, these motors run on single phase AC supply. Single phase induction motors are widely used in low power applications such as home appliances as mentioned above.
T William Hunt
SINGLE PHASE MOTORS. Advances in the design of fractional kilowatt motors. Non Excited Synchronous Motors 36.2. Single phase Asynchronous Motor. Engine Guide – basic technique. Low and high voltage asynchronous motor types. – Single phase motors – Integrated motors. Single phase induction motor and switched reluctance motor a. Fractional kilowatt engines. One-Stage Induction Analysis. • List the common types of single phase induction motors. The north pole and one south pole is a 2 pole motor. Unit 16 Electric Motors 379.
These are small in size and less expensive to manufacture. These motors are also called fractional KW motors because most of these motors are made with fractional kilo-watt capacity. Single phase asynchronous motors consist of two main parts; stator and rotor. The structure of these motors is more or less similar to a three-phase squirrel cage induction motor.
The stator is a fixed part and has a laminated structure consisting of stamps. These stamps consist of surrounding slots to support the stator winding. This winding is excited by a single phase AC supply.
The rotor is a rotating part and its structure is of the squirrel cage type. The rotor consists of uninsulated aluminum or copper rods inserted into slots.
These rotor bars are permanently shortened at both ends with the help of end rings as shown in the figure. There is no physical connection between the stator and the rotor, but there is a small and uniform gap between them. When the rotor is placed in the stator magnetic field, it acts as a conductor that produces its own magnetic field, in which an emf is induced, which further interacts with the stator field to generate torque.
With a fully printed black inner sheath. Pleasureland.
When a single phase AC supply is supplied to the stator winding, an alternating magnetic field is generated around the stator. Due to the vibratory nature of the counter rotating field in each half cycle, it cannot create rotation in a fixed squirrel cage rotor. In case of three-phase induction motor, the field generated by the supply is of rotary type and hence self-starting motors. But in the case of single phase motors, the field generated by the stator does not rotate (but only alternately) and therefore single phase motors do not start on their own. However, if the rotor is rotated by some other method (by hand or any tool), the induced currents in the rotor will assist the stator currents to produce the rotating field. This field causes the motor to run in the direction in which it was started, even with a single winding.
