Contents
Why does torque increase with current?
The increase in torque can be explained by the following physical relationships: The Torque that develops in a motor comes from the interaction between the stater’s and rotor’s magnetic fields. The strength of each magnetic field is proportional to the current flowing through the stater and rotor.
How does induction motor increase torque?
An induction motor develops torque by inducing current to the rotor, which is proportional to the differential speed of the rotor and the rotating magnetic field in the stator. Due to the torque variation at each revolution the instantaneous speed will vary.
How do you increase the torque of an AC motor?
There are three ways to improve the starting torque of Single phase induction Motor
- Internal Rotor Resistance. The across the line starting torque at low speed can be increased by increasing the rotor resistance.
- External Rotor Resistance.
- Variable Voltage/Frequency.
Is speed directly proportional to torque?
Torque is inversely proportional to speed. Thus, when speed increases, torque will decrease.
What causes torque in three phase induction motor?
The torque produced by three phase induction motor depends upon the following three factors: Firstly the magnitude of rotor current, secondly the flux which interact with the rotor of three phase induction motor and is responsible for producing emf in the rotor part of induction motor,…
Why does the rotor of an induction motor rotate?
For an induction motor, the electrical current or AC in the rotor needed to produce torque is gain through electromagnetic induction from the rotating magnetic field of the stator winding. The rotor of an induction motor can be used as a squirrel cage rotor.
How does an asynchronous motor produce torque?
An induction motor also known as an asynchronous motor is a generally used AC electric motor. For an induction motor, the electrical current or AC in the rotor needed to produce torque is gain through electromagnetic induction from the rotating magnetic field of the stator winding.
How does adding resistance to a motor increase the torque?
In the most direct answer to the question, adding resistance increases the slip for maximum torque (more torque at lower speed) by driving more current into the rotor circuit at lower speed. If rotor resistance were zero (superconductor), the induction motor would operate synchronously, but would be very hard to start!