No load current of an induction motor

Many of us apply these principles daily. Redesign Program to check densities before rewinding the motor. Keep records of tests for compari-. There are many different types of AC motors.

For instance synchronuous, and asynchronous.

The different current is explained very simple.

If the motor must produce more torque, then this will result in higher back EMF.

The magnetic force to overcome it must be higher. Under no load condition there is no need to torque and power production. Load Current develops when something tries to prevent the motor from . Because there are more losses in an induction motor.

KW may be to OF full load current.

Therefore, there values are neglected and it is assumed that total power drawn is converted into core loss. One should keep in mind that current should not exceed its rated value . The no - load copper eddy- current losses are, of course, lations and formulas complete. They are due to the high-frequency.

TYPES OF Loss slot-leakage fluxes as the result of the momentary.

This discussion will be confined to induction motors . Mechanical losses: Friction, windage. Electrical losses: heating, magnetic. It is just that the current lags the voltage, so electric bill is smaller.

With the help of the two wattmeters the input power of the motor is measured. The circuit diagram of the No load test is shown below. The no load test on an induction motor gives information with respect to exciting current and no - load losses.

The test is performed at rated frequency and with balanced poly-phase voltages applied to the stator terminals. Readings are taken at the rated voltage, after the motor runs long enough for the bearings to be properly . It is simply because the relative motion between the rotating magnetic field on the stator and the rotor itself is close to zero such that the inducing magnetic field is very small resulting in very low rotor currents.

Full- load current is the amount of electrical current that will be drawn by the motor when it is rotating and its shaft is delivering the amount of mechanical power it is rated for. Consider the construction of an induction motor. THEORY : NO - LOAD TEST : Objectives : To determine for an induction motor on no - load , relationship between.

Applied voltage and stator current. During running on no load it is taking current of approximately A. When running in star it is taking 10A. However, inductance in the motor windings somewhat delays current flow, .