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Weight kg Size WxHxD mmx90x This type of PLC is mainly used in all of the digital input, digital output control point of the device. Voltage level: three phase V. Frequency converter capacity: 2. Vector control variable frequency speed control is the practice of the asynchronous motor in the three-phase coordinate system of the stator current Ia, Ib, Ic, through the three-phase to two-phase transformation, The alternating current of Ia1Ib1 is equivalent to a two phase stationary coordinate system, and then is rotated by the rotor field oriented, Equivalent to the DC current Im1, It1 Im1 equivalent to DC motor excitation current in synchronous rotating coordinate system; It1 equal to the armature current proportional to the torque, and then imitate the DC motor control method, to obtain the DC motor control, The control of asynchronous motor is realized through the corresponding inverse coordinate transformation.
Frequency converter capacity: 45KW. For the requirements of relatively high precision, even if the load changes are also required to operate at a given speed of the occasion, Inverter with PG feedback function can be used selection.
It is based on the overall effect of three-phase waveform generation, In order to approach the ideal circular rotating magnetic field in the air gap of the motor, A generation phase modulation waveform control inscribesthe polygon to approach the circle way. After practice, it has been improved, that is, the introduction of frequency compensation, can eliminate the error of speed control; By feedback estimation of flux amplitude, eliminating the influence of stator resistance at low speed, the output voltage and current closed loop, In order to improve the accuracy and stability of the dynamic.
But there are many control circuit, and no torque is introduced, so the system performance has not been improved. The use of frequency converter motor is in order to speed, and reduce the starting current. In order to produce a variable voltage and frequency, The equipment to the power of the AC power conversion to DC DC , the process is called rectification.
The direct current DC is transformed into alternating current AC and its scientific term is "inverter" inverter. General inverter is the DC power supply inverter for a certain fixed frequency and a certain voltage of the inverter. For the inverter as the frequency adjustable, adjustable voltage inverter, we called the inverter.
Inverter output waveform is simulated sine wave, Is mainly used in three-phase asynchronous motor speed control, and also called frequency governor. The general inverter is times inverter price.
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