1) analyse the resone behind the positive and negative tourqes produced by three phase syncronous motor.
1) analyse the resone behind the positive and negative tourqes produced by three phase syncronous motor.
2) derive the output voltage of the VSI used in three phase induction motore when switches S1 and S6 are turned on and draw the waves form the crossponding gate pules and output voltage that results.
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In a three-phase synchronous motor. The stator is given the three-phase ac supply while the rotor is given a dc supply, as the synchronous motor is not self-starting.
The torque of the synchronous motor is given by the expression as shown below:
The cross-section of a three-phase synchronous machine is shown below:
As the asynchronous motor is a constant speed motor, the electromechanical torque acts in such a direction so that the interacting stator and the rotor field can be aligned.
When the synchronous machine is operating as a motor the electromechanical torque produce will act along the direction of the rotor of the motor while when the synchronous machine is operating as a generator the electromechanical torque opposes the direction of the rotation of the motor. Thus due to the positive and negative value of the power angle, the torque of the machine can be positive or negative, thus it changes its nature from the motoring mode to the generating mode.
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