Best answer: Why no load current of induction motor is high?

Magnetic circuit of Induction motor has large reluctance than transformer due to air gap between stator and rotor, more mmf(magneto motive force is equal to product of current and number of turns) or more current is required to set up working flux in Induction motor, this is the reason of high no load current in …

Why is the no load current drawn by three phase induction motor so high?

The RMF in a motor has to travel thru a high reluctance path {air gap} twice. That makes it draw a higher current from the three phase line. Hence it’s line and no load currents is higher. In case of a 3 phase transformer, whole flux passes thru the lower reluctance path {iron core}.

Why is DC motor current so high?

Answer: The starting current is high as there is no back EMF or counter EMF present in the armature circuit because atstarting counter EMF is zero. … It’s armature has very less resistance due to this it need more current at starting time. Hence DC starters are used to limit the starting current ofmotor.

IT IS INTERESTING:  Question: What LS engine is better?

How many amps should a motor draw with no load?

You can use 20 amp fuses and should be OK if the motor is good. It sounds like your no-load current is in the right ball park, but you should check the manufacturers data for actual no-load current. You also need thermal overloads if not internal to the motor.

What happens if fifth harmonics is given to induction motor?

What happens if fifth multiples of harmonics is given to induction motor? It will rotates in reverse direction.

Why can’t an induction motor run at synchronous speed?

The induction motor can’t run at synchronous speed because it is not possible to run the motor without load. Even the motor is at no load, there would be core loss,copper loss and air friction loss.In a nut shell, the motor slip can not be zero in any case.

Which motor has highest no load speed?

Explanation: At no load, armature current tends to zero, flux φ tends to zero, where speed is inversely proportional to the flux, speed will tend to infinity. Thus, no load speed of DC series motor is highest.

How can we reduce the starting current of an induction motor?

Some of the techniques used to reduce the starting current of a squirrel induction motor:

  1. Soft starting (voltage control)
  2. Variable Frequency Drives (Voltage and frequency control)
  3. Star/Delta Starting.
  4. Stator impedance and/or resistance starting.
  5. Autotransformer Starting.

Why starter is used in induction motor?

Let us study in detail why starter is required for an induction motor. At starting time, the speed of the motor is zero and slip is at its maximum i.e. unity. So magnitude of the rotor induced emf is very large at start.

IT IS INTERESTING:  What kind of transmission fluid does my car need?
Car repair school