1, first imagine the motor as two rapidly rotating magnets, a stator magnet and a rotor magnet. It can be further extended to stator magnetic field and rotor magnetic field.
2. The electromagnetic torque of the motor is directly proportional to the stator magnetic field intensity, the rotor magnetic field intensity and the sine value of the included angle between two magnets. It is not difficult to understand that when two magnets are aligned (0 degree, sin0 = 0), there is no electromagnetic torque; When the difference between two magnets is 90 degrees (sin90 =1; ), the electromagnetic torque reaches the peak.
3. Combining direct torque control with stator flux oriented vector control, the flux oriented angle in stator flux oriented vector control is deduced by using the spatial position angle of voltage vector in direct torque control, and then the mathematical model of stator flux estimation is established according to the current components of D axis and Q axis in rotating coordinate system.
4. The mathematical model of wound asynchronous motor in synchronous M T coordinate system is established, the excitation control strategy of doubly-fed motor based on stator field oriented vector control technology is expounded, and the steady-state power relationship of the motor in three operating States is analyzed.
Extended data:
Stator field oriented vector control establishes the mathematical model of wound asynchronous motor in synchronous M T coordinate system, expounds the excitation control strategy of doubly-fed motor based on stator field oriented vector control technology, and analyzes the steady-state power relationship of the motor in three operating states.
According to the characteristics of pumping station, the AC excitation motor model is established. Stator field oriented vector control strategy and dual PWM inverter are used to adjust motor speed, active power and reactive power.
Usually, this vector transformation is to transform the static three-phase system (stator ABC system) into the static two-phase coordinate system (Deng coordinate system), then transform the quantity in the static two-phase coordinate system into the mutually perpendicular coordinate system (MT coordinate system) rotating at synchronous speed for feedback control, and then inversely transform the control quantity into the three-phase system for control.
The vector transformation control principle of synchronous motor is similar to that of induction motor, but the difference is that the air gap synthetic flux vector must be selected as the direction of M axis of magnetic field oriented coordinate system.
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