Common questions

What are the losses in induction machine?

What are the losses in induction machine?

The power losses in an induction motor can be relegated to five elements. Stator conductor loss, rotor conductor loss, iron loss, stray‐load loss, friction and windage loss.

How many losses are present in induction motor?

5 losses
Explanation: There are 5 losses present in the induction motor. They are i) Stator copper losses, ii) Rotor copper losses, iii) Stator iron losses, iv) Friction and winding losses, v) Additional losses.

Which losses are more in induction motor?

The most significant changes to the loss in induction motors caused by the repair process would be expected to be to stator copper loss, to core loss and to stray load loss. This is shown to be the case but the overall effect is normally less than 0.5% loss of efficiency.

What are the different types of losses in motor?

Various types of losses, including rotational losses, reduce motor efficiency.

  • Mechanical losses. As their name suggests, mechanical losses are caused by movement of the motor.
  • Magnetic losses (aka core losses or iron losses)
  • Copper losses (aka electrical losses or winding losses)
  • Brush losses.
  • Stray load losses.

What are the types of losses in transformer?

The four main types of loss are resistive loss, eddy currents, hysteresis, and flux loss.

What are the losses in a DC motor?

In a DC machine, there are only two windings, armature and field winding. Thus copper losses categories in three parts; armature loss, the field winding loss, and brush contact resistance loss. The copper losses are proportional to the square of the current flowing through the winding.

Which losses are fixed losses?

Intrinsic losses are of two types: fixed losses – independent of motor load, and variable losses – dependent on load. Fixed losses consist of magnetic core losses and friction and windage losses. Magnetic core losses (sometimes called iron losses) consist of eddy current and hysteresis losses in the stator.

Which losses is present in induction motor but absent in transformer?

An electrical transformer is an static device, hence mechanical losses (like windage or friction losses) are absent in it. A transformer only consists of electrical losses (iron losses and copper losses).

What is hysteresis losses in induction motor?

Hysteresis loss is caused by the magnetization and demagnetization of the core as current flows in the forward and reverse directions. A hysteresis loop shows the relationship between the induced magnetic flux density (B) and the magnetizing force (H). It is often referred to as the B-H loop.

What are the 2 main types of losses in a motor?

There are two main kinds of losses in electric motors, which are often referred to as iron losses and copper losses. Dealing first with iron losses, these are made up of two ‘components’, namely eddy current losses and hysteresis losses.

What are the various losses in DC motor?

What are the various types of losses?

The four main types of loss are resistive loss, eddy currents, hysteresis, and flux loss.

  • Resistive Loss.
  • Eddy Current Loss.
  • Hysteresis Loss.
  • Flux Loss.
  • Transformer Efficiency.

Why are there losses in an induction motor?

In three phase induction motor the speed usually remains constant. Hence these losses almost remains constant. These losses are also called copper losses. These losses occur due to current flowing in stator and rotor windings. As the load changes, the current flowing in rotor and stator winding also changes and hence these losses also changes.

What are Eddy and hysteresis losses in an induction motor?

Hysteresis and Eddy current losses in the stator core. These are known as Stator core losses. The output power of the stator is given as: This output power of the stator is transferred to the rotor of the machine across the air gap between the stator and the rotor.

What is the input to an induction motor?

As we all know the input to the three phase induction motor is three phase supply. So, the three phase supply is given to the stator of three phase induction motor. Cosφ = power factor of the three phase induction motor. A part of this power input is used to supply stator losses which are stator iron loss and stator copper loss.

What are stray load losses in a motor?

The stray load losses include rotor iron loss, additional fundamental frequency and high frequency losses in the iron, strand and circulating current losses in the stator winding. These losses are 0.5% of power supplied to the motor.

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