According to the classification of the main circuit operation mode, it can be divided into voltage-type inverter and current-type inverter; According to the classification of switching methods, it can be divided into PAM control inverter, PWM control inverter and high carrier frequency PWM control inverter;
According to the classification of operating principles, it can be divided into V/f control inverter, slip frequency control inverter and vector control inverter, etc.; According to the classification of use, it can be divided into general-purpose inverter, high-performance special inverter, high-frequency inverter, single-phase inverter and three-phase inverter.
The output voltage of low-voltage general frequency conversion is 380-650V, the output power is 0.75-400kW, and the operating frequency is 0-400Hz. It has been operated by the following four generations.
1U/f=C sine Pulse Width Modulation (SPWM) control
It is characterized by simple control circuit structure, low cost, good hardness of mechanical characteristics, and can meet the smooth speed regulation requirements of general transmission, and has been widely used in various fields of industry. However, at low frequency, due to the low output voltage, the torque is significantly affected by the voltage drop of the stator resistance, so that the output torque is reduced.
In addition, its mechanical characteristics are not as hard as DC motors, dynamic torque and static speed regulation functions are not satisfactory, and the system function is not high, the control curve will change with the change of load, the torque response is slow, the motor torque utilization rate is not high, and the function decreases due to the existence of stator resistance and inverter dead zone effect at low speed, and the stability deteriorates. Therefore, people have studied vector control frequency conversion speed regulation.
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