Table of Contents
How is torque generated in motor?
When a DC machine is loaded either as a motor or as a generator, the rotor conductors carry current. These conductors lie in the magnetic field of the air gap. Thus each conductor experiences a force. Hence torque is produced at the circumference of the rotor and rotor starts rotating.
What is torque in an induction motor and how is it developed and calculated?
Torque of a three phase induction motor is proportional to flux per stator pole, rotor current and the power factor of the rotor. T ∝ ɸ I2 cosɸ2 OR T = k ɸ I2 cosɸ2 .
What is torque developed?
The developed Torque or Induced Torque Equation in a machine is defined as the Torque generated by the electric to mechanical power conversion. The torque is also known as Electromagnetic Torque.
How is torque developed calculated?
To calculate load torque, multiply the force (F) by the distance away from the rotational axis, which is the radius of the pulley (r). If the mass of the load (blue box) is 20 Newtons, and the radius of the pulley is 5 cm away, then the required torque for the application is 20 N x 0.05 m = 1 Nm.
How do you calculate motor torque?
The required torque is calculated by multiplying the sum of load torque and acceleration torque by the safety factor. When the required torque for the motor varies over time, determine if the motor can be used by calculating the effective load torque.
What is shaft torque in induction motor?
A.c. induction motors produce shaft torque which is proportional to percentage slip, implying that with zero slip the machine produces zero torque. In a synchronous motor, torque can be produced at synchronous speed.
How is motor torque calculation?
- Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)
- Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.
- Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)
- Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.
How is torque produced in an induction motor?
An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding.
Which are factors produce torque in induction motors?
The torque produced in the induction motor depends on the following factors : The part of rotating magnetic field which reacts with rotor and is responsible to produce induced e.m.f. in rotor. The magnitude of rotor current in running condition. The power factor of the rotor circuit in running condition.
What is the power factor of an induction motor?
Generally an Induction motors operates at low power factor (approx pf 0.2 to 0.4) during light load or no load condition and at full load (approx pf 0.8 to 0.9).
How do you control the speed of an induction motor?
Synchronous speed of the induction motor depends on the number of poles in the motor of stator side and the frequency of the motor on the supply side. So by changing the supply frequency of the motor you can control the speed of the motor.