Losses in Induction Motor The losses in induction motor are broadly categorized into two classes, namely constant losses and variable losses. Constant losses in Induction Motor These losses do not depend on the load hence they are known as constant losses. These can be further categorized as under: The no-load test is performed on induction […]
To draw the torque slip characteristics of induction motor (three phase) following points are considered: T = ksE22R2 / R22 In the above expression, all quantities are constant except slip s. Therefore, T α s Torque Slip Characteristics of Induction Motor Thus, at low values of slip, torque is approximately proportional to slip s and the torque
Full load torque equation of induction motor is as follows: Starting Torque Equation of Induction Motor The starting torque of a motor is that torque which is produce by it at start. It is denoted by Tst and corresponds to s = 1. So by substituting s = 1 in above expression, we get the
Hi friends, in this article I am describing the importance of slip in induction motor and hoping you will find it informative and useful. In the induction motor rotor always rotates speed less than synchronous speed. The difference between the rotor speed (N) and the rotating magnetic flux speed (Ns) is called slip. The induction motor
The induction motor rotates due to the rotating magnetic field in induction motor, which is produced by the stator winding in the air gap between the stator and the rotor. The stator has a three phase stationary winding which can be either star connected or delta connected. Whenever the AC supply is connected to the
The AC induction motor is the dominant motor technology in use today, representing more than 90 percent of installed motor capacity. Induction motors are available in single-phase (1ϕ) and three-phase (3ϕ) configurations, in sizes ranging from fractions of a horsepower to tens of thousands of horsepower. They may run at fixed speeds – most commonly
Induction machines are also called asynchronous machines i.e. the machines which never run at a synchronous speed. Whenever we say induction machine we mean to say induction motor. Induction motors may be single-phase or three-phase. In this article, I am discussing about three phase induction motor construction. The three-phase induction motors are the most commonly used
A shaded pole motor is constructed with salient poles in the stator. Each pole has its exciting coil. A 1/3rd portion of each pole core is surrounded by a strap of copper forming a closed loop called the shading coil. The rotor is a usual squirrel cage type. The common form of these motors has only
In ac circuits, power is measured with the help of wattmeter. A wattmeter is an instrument, which consists of two coils called the potential coil (PC) and the current coil (CC). The potential coil having high resistance is connected across the load and carries the current proportional to the potential difference across the load. The current coil
In this method of interconnection, the dissimilar ends of three phase windings are joined together i.e. finishing end of one phase is connected to the starting end of the other phase and so on to obtain a closed circuit. The three line conductors are taken from the three junctions of mesh and are denoted by R,