Explosion-proof inverter advantages performance details
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Works <br> <br> explosion-proof inverter main circuit to provide voltage and variable frequency to induction motor power converting part ,, filtered DC circuit is capacitance. The current type converts the DC of the current source to AC, and the DC loop filter is an inductor. It consists of three parts: a "rectifier" that converts the power-frequency power source into a direct-current power, a "fluid-wave circuit" that absorbs the voltage ripple generated by the converter and the inverter, and an "inverse" that converts the direct-current power into the alternating-current power. Changer."
(1) Rectifiers: Recently, a large number of diode-based converters are used, which convert an industrial power supply into a DC power supply. It is also possible to use two sets of transistor converters to construct a reversible converter, which can be regenerated due to its reversible power direction.
(2) Smooth wave circuit: In the DC voltage after the rectifier is rectified, it contains the pulsating voltage of 6 times the power frequency, and the pulsating current generated by the inverter also causes the DC voltage to fluctuate. In order to suppress voltage fluctuations, inductors and capacitors are used to absorb the ripple voltage (current). When the capacity of the device is small, if the power supply and the main circuit configuration device have a margin, a simple flat wave circuit can be omitted from the inductor.
(3) Inverter: In contrast to a rectifier, an inverter converts DC power to AC power of a desired frequency, and turns the six switching devices on and off in a determined time to obtain a 3-phase AC output. Take the voltage type pwm inverter as an example to illustrate the switching time and voltage waveforms.
The control circuit is the circuit that provides the control signal to the main circuit (voltage, frequency adjustable) of the asynchronous motor. It has the frequency and voltage "operation circuit", the main circuit "voltage and current detection circuit", the motor "speed detection "Circuit", a "driver circuit" that amplifies the control signal of the arithmetic circuit, and a "protection circuit" of the inverter and the motor.
(1) Operation circuit: Comparing the external speed and torque commands with the current and voltage signals of the detection circuit to determine the output voltage and frequency of the inverter.
(2) Voltage and current detection circuit: It is isolated from the main circuit potential to detect voltage and current.
(3) Drive circuit: A circuit that drives a main circuit device. It is isolated from the control circuit so that the main circuit device turns on and off.
(4) Speed ​​detection circuit: The signal of the speed detector (tg, plg, etc.) mounted on the asynchronous motor shaft machine is the speed signal, which is sent to the calculation circuit. According to the instruction and operation, the motor can be operated at the command speed.
(5) Protection circuit: Detect the voltage, current, etc. of the main circuit. When an abnormality such as overload or overvoltage occurs, in order to prevent the damage of the inverter and the asynchronous motor, the inverter stops working or suppresses the voltage and current values.
Explosion-proof inverter role <br> <br> drive combines high-voltage power transistor technology and electronic control technology, widely used. The function of the frequency changer is to change the frequency and amplitude of the power supply of the AC motor, thus changing the cycle of its moving magnetic field and achieving the purpose of smoothly controlling the rotation speed of the motor. The appearance of the frequency converter makes the complex speed control simple, and replaces most of the work that could only be done with a DC motor with a combination of a frequency converter and AC squirrel-cage induction motor, which reduces the volume, reduces the maintenance rate, and makes the drive The technology has developed to a new stage.
Explosion-proof inverter advantages 1, can solve high-power motor high-precision torque control;
2, can achieve high power motor soft start, soft stop and process control;
3, power balance when multi-machine linkage;
4. Regenerative braking and energy feedback in four-quadrant operation, energy saving and emission reduction;
5, purification of the environment, safe production;
6, extend equipment life.
Interference free <br> <br> explosion proof inverter drive has three interference types, namely: conduction, electromagnetic radiation, inductively coupled. Specific to:
1 Generate electromagnetic radiation on the surrounding electronic and electrical equipment;
2 Electromagnetic noise is generated on the directly driven motor, which increases the iron loss and copper loss of the motor, which in turn generates heat, and conducts the interference to the power supply. The power is transmitted to the system through the distribution network. Shanghai Di-Ao Automation Technology Co., Ltd. 3 Explosion-Proof Inverter Inductive coupling occurs on adjacent other lines, which induces an interfering voltage or current. In the same way, interference signals in the system interfere with the normal operation of explosion-proof inverters through the same route.