1. The electromagnetic torque of the synchronous motor is the interaction between the rotating magnetic field of the stator generated by the power supply voltage and the main magnetic field of the rotor;
2. The intersection angle of the magnetic pole axis of the rotating magnetic field of the stator and the main magnetic field of the rotor is called the work angle;
3. When the power angle is zero, the electromagnetic torque is zero, the larger the power angle, the greater the torque, the greater the stator current, just like when you pull the car, the greater the elongation of the rope, the greater the pulling force;
4. Of course, when the power angle is close to 90 degrees, the torque is the largest and the current is the largest;
5. When the power angle is greater than 90 degrees, the torque begins to decrease, and it enters the unstable operation area, which will soon lose step, which is equivalent to the broken rope when pulling the car!
6. The physical quantities related to the magnitude of the power angle are:
1) Electromagnetic torque;
2) stator current;
3) Output power (related to speed);
7. When the power angle increases from zero to 90 degrees, it is a monotonic increasing function with current, torque and power, which is simply that the current, torque and power increase when the power angle increases;
8. As long as the current of the synchronous motor is detected, the size of the power angle and the size of the torque will be known!
9. For example, if you detect that the current of the synchronous motor is the rated current, then it goes without saying that the power angle is the rated power angle and the torque is the rated torque!
10. For synchronous motors, the frequency conversion starts from zero HZ, and the current increases from zero, when the current increases to the rated current, the power angle is the rated power angle, and the torque is the rated torque, at this time, the power is the smallest, and the power reaches the rated power when the speed increases to the rated speed!
11. As long as the control current is the rated current, the power angle is the rated power angle, and the torque is the rated torque!
12. In the case of a certain current, the voltage can also be increased, the magnetic field can be enhanced, and the torque can be increased, which is the second way of torque control!
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