Multiple choice questions on Synchronous motor with brief explanatory answers.
Synchronous Motor MCQ Part 7
The pull-out torque of a 3 phase synchronous motor varies as
The pull-out torque of a synchronous motor varies as:
- Square of voltage
- Square root of voltage
Correct answer: 2. Voltage
The pull-out torque of a synchronous motor is mathematically defined as:
The steady-state speed of the motor is constant from no load to the maximum torque that the motor can supply: which is called the pull-out
The maximum or pull-out torque of motor is given by the following relationship:
τ = (3 Vϕ.EA)/(ωm.Xs)
From above equation one can understand that the pull-out torque of motor varies as the voltage.