How to wire the internal control and external control of Delta's inverter?
Internal control: connect the main circuit power supply RST motor UVW, press the inverter panel to start and stop. Both the command source and the frequency frequency should be selected in the panel.
External control: the main circuit power supply, the RST motor UVW terminal, the (start the stop switch) potentiometer (speed regulation) command source and frequency frequency should be selected as the external terminal control.
The common frequency giving methods of inverter mainly include: operator keyboard given, contact signal given, analog signal given, pulse signal given and communication method given. These frequency given methods have their own advantages and disadvantages, and it is necessary to select and set them according to the needs of practice, and at the same time, different frequency given methods can also be selected according to the functional needs for superposition and switching.
1. Sinusoidal Pulse Width Modulation (SPWM) control method
It is characterized by simple control circuit structure, low cost, good hardness of mechanical characteristics, can meet the smooth speed regulation requirements of general transmission, and has been widely used in various fields of industry.
However, this control method is at low frequency, because the output voltage is low, and 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 echo 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.
2. The voltage space vector (SVPWM) control method is based on the premise of the overall generation of the three-phase waveform, and the intention is to generate the three-phase modulation waveform at one time with the intention of imminenting the circular rotating magnetic field trajectory of the motor air gap, and control it by the method of inscribed polygon imminent circle.
After practical application, it has been improved, that is, the introduction of frequency compensation, which can eliminate the error of speed control; After the reaction to estimate the flux amplitude, the influence of stator resistance at low speed is eliminated. The output voltage and current are closed to improve the accuracy and stability of the dynamics. However, there are many links in the control circuit, and there is no torque adjustment, so the system function has not been fundamentally improved.
3. Vector manipulation (VC) method
The method of vector control frequency conversion speed regulation is to convert the stator current la, lb, Ic, and the stator current of the asynchronous motor in the three-phase coordinate system is equivalent to the communication current la1Ib1 in the two-phase static coordinate system after the three-phase two-phase conversion of the three-phase coordinate system, and then the directional rotation and change according to the rotor magnetic field is equivalent to the DC current Im1 and It1 under the synchronous rotation coordinate system (Im1 is equivalent to the excitation current of the DC motor; IT1 is equivalent to the armature current proportional to the torque), and then imitate the control method of the DC motor, obtain the control quantity of the DC motor, and complete the control of the asynchronous motor through the corresponding coordinate reversal.
Its essence is to equivalence the communication motor to the DC motor, and the speed and magnetic field weight are controlled independently. After manipulating the rotor flux, and then decomposing the stator current to obtain the two weights of torque and magnetic field, the coordinates are changed to complete the orthogonal or decoupling control. The vector manipulation method has epoch-making significance. However, in practical application, because the rotor flux is difficult to observe accurately, the system characteristics are greatly affected by the motor parameters, and the vector rotation change used in the operation process of the equivalent DC motor is more chaotic, which makes it difficult to achieve the results of ambition analysis in practice.
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