The torque angle, in a synchronous motor, is the angle between
A. the rotating stator flux and rotor flux.
B. magnetizing electric current and back emf.
C. the supply voltage and the back emf.
D. none of the above.
Answer: A
Share your understanding of this question with the correct explanation.
The answer is A. the rotating stator flux and rotor flux.
The torque angle in a synchronous motor is the angle between the rotating stator flux and rotor flux. The rotating stator flux is created by the three-phase stator windings, and the rotor flux is created by the DC field winding. The torque angle determines the amount of torque produced by the motor.
When the torque angle is zero, the stator and rotor fluxes are aligned, and the motor produces maximum torque. As the torque angle increases, the stator and rotor fluxes become increasingly misaligned, and the motor produces less torque. When the torque angle reaches 90 degrees, the stator and rotor fluxes are perpendicular to each other, and the motor produces no torque.
The torque angle can be controlled by adjusting the DC field current. Increasing the field current increases the rotor flux, which reduces the torque angle. Decreasing the field current decreases the rotor flux, which increases the torque angle.
The torque angle is an important parameter in synchronous motors. It determines the amount of torque produced by the motor, and it can be controlled by adjusting the DC field current.