T940X,XAPMM,BATT,ENG | SUIT | Magnetic field orientation control MODULE

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T940X,XAPMM,BATT,ENG | SUIT | Magnetic field orientation control MODULE

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For asynchronous motors, in order to ensure that the magnetic T940X,XAPMM,BATT,ENG and output of the motor remain constant, the ratio of voltage V to frequency F needs to be maintained approximately unchanged when the motor changes frequency. Therefore, this method is called constant voltage frequency ratio (VF) control. VF control – simple control, strong universality, good economy, suitable for situations where speed accuracy requirements are not very strict or load changes are small. Essentially, VF control actually controls the voltage and frequency of three-phase AC power. However, T940X,XAPMM,BATT,ENG power has three elements, namely, in addition to voltage and frequency, there is also phase. VF control does not control the phase of the voltage, which leads to a slowdown in the motor speed during transient changes, such as sudden load application. However, the motor power supply frequency, i.e. synchronous speed, remains unchanged. This causes instantaneous loss of step in asynchronous motors, resulting in torque and speed oscillations. After a period of time, the motor maintains balance at a larger slip. During this instantaneous process, there is no phase control, so the recovery process is slow, and the motor speed will change with the load, which is the reason for the low accuracy and slow response of VF control.

Vector control, T940X,XAPMM,BATT,ENG  also known as field oriented control in foreign countries, essentially controls the voltage and frequency of three-phase AC power, and adds phase control. This phase is reflected in specific operations as an angle, which is simply the position angle of the motor stator current relative to the rotor. We know that the comprehensive effect of three-phase symmetrical AC current in the motor stator is a rotating magnet. After being energized, this rotating magnetic field induces three-phase AC current on the rotor, which is equivalent to a magnet. This is equivalent to the stator magnet dragging the rotor magnet to rotate, which is the basic principle of motor rotation. There is a problem here, which is that only when the relative positions of the stator magnet and rotor magnet are closest can the maximum torque be generated. Therefore, how to obtain the maximum torque by energizing the three-phase stator winding of the T940X,XAPMM,BATT,ENG is actually related to the position of the rotor. Vector control will calculate the rotor position in real time by combining the measured current with the motor parameters. This process is called “magnetic field orientation”, and then determine the phase of the voltage on the three-phase stator winding in real time. In theory, this can achieve the optimal torque generated under the same current, thereby reducing the transient process when the motor load changes. In addition, vector control also calculates the speed based on the rotor position, and uses motor parameters for instantaneous compensation of the speed, further optimizing control performance.

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