What is torque in synchronous motor?
Table of Contents
- 1 What is torque in synchronous motor?
- 2 How do you calculate torque of a synchronous motor?
- 3 How do you control speed of synchronous motor?
- 4 Why does synchronous motor runs at synchronous speed?
- 5 When torque angle is 90 degree the torque of synchronous motor?
- 6 At what speed does synchronous motor run?
What is torque in synchronous motor?
The torque of a synchronous motor is produced by the phase difference between the rotating magnetic field and the rotor. The torque is low when there is a small phase difference between the rotating rotor and the rotating magnetic field.
What is synchronous speed formula?
The synchronous speed of an AC motor is determined by the frequency of the source and the number of poles. The RPM is calculated by multiplying the frequency times 60 and dividing by the number of pairs of poles. Actual speed of the induction motor will be less than the synchronous speed.
How do you calculate torque of a synchronous motor?
Te = FsFrSinλ
- The stator and rotor iron have infinite permeability.
- All the magnetic flux crosses the air gap perpendicularly.
- The air gap length is very small when compared to the axial length of synchronous machine.
- Only fundamental sine component of stator and rotor mmf wave is considered.
What is synchronous torque?
the torque that acts on the shaft of a synchronous machine when the rotational speed of the rotor deviates from the synchronous speed and that keeps the machine in synchronism.
How do you control speed of synchronous motor?
We can control the speed of the synchronous motor by changing the frequency of the supply to the motor.
What is the speed regulation of synchronous motor?
zero
Synchronous motor running at the constant synchronous speed. Therefore there is no speed loss, so the speed regulation of synchronous motor is zero.
Why does synchronous motor runs at synchronous speed?
A synchronous motor runs at synchronous speed only because it is meant to run like that . It cannot run on a speed other than synchronous speed. Stator(N) links with Rotor(S).
What is synchronous speed of motor?
Synchronous speed is the speed of rotation of the magnetic field in a rotary machine. An induction motor always runs at a speed less than synchronous speed. The rotating magnetic field which is produced in the stator will generate flux in the rotor which will make the rotor rotate.
When torque angle is 90 degree the torque of synchronous motor?
The maximum torque occurs at a torque angle of 90 electrical degrees. This is called the pull-out torque, which indicates the maximum value of torque that a synchronous motor can develop without pulling out of synchronism. In general, its value varies from 1.25 to 3.5 times the full-load torque.
What is the speed of synchronous motor?
The synchronous speed is the speed of the revolution of the magnetic field in the stator winding of the motor. It is the speed at which the electromotive force is produced by the alternating machine….Synchronous Speed.
| Number of Poles | Synchronous Speed NS in r.p.m |
|---|---|
| 10 | 600 |
| 12 | 500 |
At what speed does synchronous motor run?
The 3-phase 4-pole (per phase) synchronous motor will rotate at 1800 rpm with 60 Hz power or 1500 rpm with 50 Hz power. If the coils are energized one at a time in the sequence φ-1, φ-2, φ-3, the rotor should point to the corresponding poles in turn.
Why synchronous motor is called a constant speed motor?
Synchronous motor is the motor when rotor speed synchronise with speed of rotating magnetic field. Rotor speed of synchronous motor locked with the speed Rotating magnetic field. So the speed of synchronous motor must be constant and fixed. This speed solely depends upon frequency and no of poles.