What is the relation between rotor MMF and stator MMF?

What is the relation between rotor mmf and stator mmf? Explanation: First the stator mmf is calculated. Then it is multiplied by 0.85 to obtain the rotor mmf.

What is the angle between stator?

The angle between the rotor poles and stator poles in a synchronous motor is known as the Torque angle. It is the angle by which the rotor magnetic axis is ahead of the resultant air-gap flux. The resultant flux is the vectorial sum of the armature flux and rotor flux and rotates synchronously.

Is rotor angle and power angle same?

Load Angle in synchronous machine is defined as the angle between the filed mmf or flux and the resultant air gap mmf or flux. Load angle and power angle are same thing which are used synonymously. Resultant air gap flux is the net flux in the air gap of machine due to combined action of stator as well as rotor flux.

What is the meant by load angle of an alternator which factors are important?

The Torque produced in the synchronous motor is purely depending on the load angle (sin δ). It is measured by the degree in electrical. Increasing in load angle indicate the decreasing magnetic locking between the rotor poles and stator poles.

What is the ratio of rotor copper loss and rotor input?

1/S
Rotor copper loss = S × Rotor input power ∴ Rotor input / Rotor copper loss = 1/S.

What is the angle between stator direct axis and quadrature axis?

90°
What is the angle between stator direct axis and quadrature axis? Explanation: In reluctance motor, direct axis is horizontal axis and quadrature axis is at 90° to the direct axis. Explanation: Space angle is measured between stator direct axis and long rotor axis.

What is rotor angle?

Rotor angle is the position of the rotor relative to the terminal voltage. The relative angle between these two sinusoidally varying quantities has a direct relation to the power output of the machine.

What is the difference between power angle and load angle?

For the case of synchronous motor, the angle is called torque angle and the rotating field lags the stator field in this case. Power angle: For a generator, the power angle is the difference between the generator induced voltage and the generator terminal voltage. The value of the power angle is same as the load angle.

What is load angle in alternator?

The load angle is the angle between the no-load excitation voltage Ef and terminal voltage Vt. Load angle (δ) or torque angle is negative when rotor fields leads the resultant field and it is positive when the rotor field lags the resultant field.

What is the relation between pole pitch and the core length in terms of the best power factor?

What is the Relation between pole pitch and the core length in terms of the best power factor? Explanation: For the best power factor, the pole pitch is equal to the square root of the product of 0.18 and core length.