Single Phase Motor And Types.

Single phase motor :-

Introduction:-The number of machines working on a single phase supply is more than the other types taken in the total. For the most part, however, they are used only in small sizes, less than 5 kW and mostly partial HP Range. They work on low power factors and are relatively inadequate when completed with poly-phase motors. In view of the two-line supply simplicity can be expected, the analysis is quite complex.
Single Phase Motors do a lot of useful services at home, in the office, in the factory, at business establishments, in the farm, and at many other places where electricity is available. The requirements of many applications are so widely vary, the
motor-manufacturing industry has developed many types of such machines, each of
which have operational features that meet certain demands.
For example, a type is operated satisfactorily at any frequency, up to 60 cycles; One rotates at a completely steady pace, regardless of the load, the second develops the initial torque, and yet another, although no very capable of developing very early torque, yet very cheap to make, and It's very boring.

Types of Single phase motor :-

Single phase motor is the following:-

1. Single-phase induction motor.
2. Commutator type single-phase motor
3. Single Phase Synchronous Motors.


1. Single phase induction motor is also as follows. :

(A) Split Phase Motors. :- 

(a) Resistance — Start the motor.
(b) Capacitor — Start the motor.
(c) Permanent — Split (single-value) capacitor motor.
(d) Two-value capacitor motor.


(B) Shaded — Pole induction motor.
(C) Reluctance — Start the induction motor.
(D) Repulsion — Start the induction motor.

2. Commutator type, single phase motors also are as follows:

(A) Repulsion motor.
(B) Repulsion induction motor.
(C) A.C. Series motor
(D) Universal Motor

3. Single-phase synchronous motors are also the following:

(A) reluctance motor
(B) Hysteresis motor.
(C) Sub-synchronous motor.

Single phase induction motor.--
Single-stage induction motors are very much used in the industry, especially in the field of partial horse power. They are extensively used for low power continuous speed equipment such as machine tools, home appliances and electric drives for agricultural machinery where there are three stages, supplies are not easily available. There is a huge demand for single phase induction motor in sizes ranging from small outputs, they are not used for large power because they suffer from many losses and are never used in cases where three-phase machines can be adopted is.
The main merits of single phase induction motors are:
1. Their production is only 50% of three-phase motor, for a given frame size and temperature rise.
2. They have less power factor.
3. Low — Efficiency
4. These motors do not have built-in initial torque.
5. The same output is more expensive than three-phase motors.
Split Phase Motors —
Since single phase induction is not a self-start, the device should be made available for making initial torque, if it is made rotating flux in the stator, then it is possible. It is known that when there is a difference of 90° between the streams of two stable coils, a rotating flow is generated. If the stator has two flux, in which there is a large phase difference, the result is a rotating flow.
Split phase continence start induction motor —
In a split phase induction motor, the stator is provided with two parallels curved displacement 90 degree electrical degrees in space and in less than 90 degrees in some time.
In the initial winding there are fewer twists and smaller wires copper wounds than current winding. So start winding, high resistance and low reaction. There are low resistance and high reaction in the current or main, curved. Due to its low impedance, current in current winding is more than current winding current.