Chemical pump: what is the inverter, the use of frequency converter performance have?

In chemical pump use, many users when necessary chemical water pump adopts frequency conversion motor, inverter control current chemical pump, chemical water pump used: what benefits do the inverter control, frequency converter, what are the functions? One minute to read, what is the frequency converter, and performance have? A, what is the frequency converter? Inverter is through the application of power electronic technology, change motor power frequency, to control the power of the motor speed control device. Frequency converter mainly rectifier circuit, snubber circuit, filter circuit, inverter circuit, etc. 1, the inverter circuit: dc ( Dc bus) Convert alternating current (ac) power electronic circuits. In a multiple of IGBT inverter bridge. Each IGBT are integrated in a fly-wheel diode, its role is for the stator winding of the motor feedback energy ( Motor power) Provide circuit. When the motor is in a state of power generation, its power can flow through the fly-wheel diode to dc circuit, electrolytic capacitor charging. 2, filtering circuit: general pressure value is 400 v of electrolytic capacitor; And 380 v three-phase alternating current (ac), after rectification, is about 537 v dc voltage the theoretical value. Filter capacitor, therefore, only by two levels of electrolytic capacitor in series. Due to the electrolytic capacitor capacity can't be absolutely same, series after two levels of electrolytic capacitor on the voltage distribution is not balanced, can lead to both the service life of electrolytic capacitors. In order to solve the problem of voltage imbalance, respectively on both ends of two capacitors in parallel resistance the same compressive resistance. 3, rectifier circuit: is mainly composed of rectifier bridge; Alternating current (ac) ( Mains) After the whole bridge rectifier into direct current. For three-phase 380 v alternating current (ac), after rectification, dc voltage the theoretical value of 380 x1. 414≈ 537 v; And single-phase 220 v alternating current (ac), after rectification, dc voltage the theoretical value of 220 x1. 414≈ 310V。 4, the buffer circuit: inhibition in the electric instant impact on current. By the principle of electrolytic capacitors, the inverter in the electricity in an instant, not the ends of the capacitor voltage mutation, and at the ends of the capacitor current mutation, both ends of the capacitance is equivalent to short circuit. If no buffer circuit ( Charging resistance) , rectifier bridge will be damaged because of the current is too large. To protect the rectifier bridge buffer circuit. 2 what are the functional features, inverter? 1, the energy saving effect in all kinds of fan, water pump, oil pump, air or liquid resistance is roughly the direct ratio with motor speed 2 times, the required power and motor speed of three direct ratio. When the required air volume and flow rate reduce use frequency converter speed control to adjust the air flow and flow, can greatly save power. 2, soft start function adopts inverter soft start, the starting current is rated current of 1. 2 - 1. 5 times, effectively reduce the start impact current, reduce the uneven distribution of transformer. Use mains directly start the motor, the startup electric current for the motor rated current of 5 - Seven times. This motor straight rev cases, to cause a decline in power grid voltage, influence other normal operation of electrical equipment. 3, a variable frequency drive (VFD). Traditional for speed regulating pole change motor speed; According to the three phase asynchronous motor with speed: but by changing the motor stator winding of magnetic pole logarithm, can change its synchronous speed, so as to change the rotor speed. Through the different combination of winding connection mode, generally available to the poles, triode, quadrupole speed. A narrow range of speed regulation, and generally for double speed. b。 Frequency control of motor speed based on motor speed is proportional to the work power input frequency: the relationship between work by changing the motor power frequency f change the motor speed. Its speed regulation method is convenient, can according to different process, given the speed of the motor.
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