Stray losses in induction motor

In this paper, we investigate the stray load losses of induction motors due to the harmonic magnetic fields caused by the stator and the rotor slot ripples . The nonlinear time-stepping finite element analysis considering end-effects of the motor is carried out to obtain the copper losses of the stator winding and the . Stray Load Loss , Additional Loss , Induction Machine. Abstract: The purpose of this paper is to specify the main components of the stray load loss of induction motors from both of measurement and analysis. On the other han the losses generated at the .

Stray load losses in induction motors : a challenge to academia.

Abstract: The paper describes the sources and components of stray load losses in squirrel-cage induction motors and examines the validity of the reverse- rotation test method which has previously been recommended as the best available method for measuring the loss.

It is shown that this method of test is based on . Leakage inductance is by itself largely lossless, since energy supplied to its magnetic fields is returned to the supply with the next half-cycle. As in Squirrel cage Induction Motor , as no brushes are there, hence brush friction loss shall not be considered for Squirrel cage Induction Motor. STRAY LOAD LOSSES III INDUCTION MACHINES. Abstract – The accurate determination of induction motor efficiency depends on the estimation of the five losses of stator and rotor copper loss , iron loss , mechanical loss and stray load loss.

As the mechanical and stray load losses are not calculated by electro-magnetic analysis, the values of these two losses are very . In an induction motor , losses in the magnetic materials account for to of total losses. The iron loss effectively reduces both the output capability and possibly the life span of the machine. Accurate stray load losses are then . Abstract—This paper investigates the input–output and the calorimetric methods of evaluating stray load loss in induction motors.

It highlights the difficulties of accurately measuring stray load loss experimentally and thereby declaring the correct machine efficiency. The standard experimental approach of input–output. Abstract – The international standards for determining induction motor efficiency are not in agreement with each other.

At the heart of the differences is the stray load loss. The way this loss is quantified is continuously debated. In the proposed model, an additional resistance appears in series with the . Surface loss due to slot-leakage flux.

I2R copper losses for stator and rotor. Calculation Improvement of No-load Stray Losses in Induction Motors with Experimental Validation. Abstract: On the basis of the known fact that all air gap main flux density variations are enclosed by permeance slot harmonics, only one component of stray losses in rotor (stator) iron is considered in the . Minimizing stray loss from inter-bar currents flowing circumferentially through the laminations between rotor conduct- ing bars can slightly increase induction machine efficiency on skewed machines with imperfect bar insulation. Adjusting traditional induction .