What is a frequency converter?
The frequency converter is a power control device that exchanges the power frequency power source to another frequency using the disconnection of the power semiconductor device. (Simple is the exchange frequency, reaching the regulation speed, energy saving effect. HB380 frequency range 0-150Hz, HB280 frequency range 0-400Hz).
What are the classifications of the inverter?
Different from the exchange of communication:
(1) Turn-Direct-Direct Frequency "rectifier" in direct current "rectifier" is expanded into direct current, and then the direct current "inverter" is arbitrarily adjustable three-phase alternating current.
(2) The intersection-alternating frequency converter converts the frequency of alternating current directly into the frequency (the same as the phase before and after the conversion).
Classified according to the energy storage link of the DC circuit (filtering method):
(1) Voltage underverter its energy storage element is a capacitor. In the medium, the small-capacity drive is mainly the voltage type inverter.
(2) Current frequency converter has its energy storage element as inductive coil.
Classified according to the modulation method of the voltage;
(1) The size of the pulse width modulation (SPWM) inverter voltage is achieved by adjusting the pulse duty cycle. In the medium, small-capacity universal inverters are almost all of them use such inverters.
(2) The size of the pulse amplitude modulation (PAM) inverter voltage is achieved by adjusting the DC voltage amplitude.
Classification according to the phase of the input voltage;
(1) The input side and output sides of the three-in-three outgoing frequency converter are three-phase alternating current. Most inverters are such.
(2) The input side and output sides of the three-inverter frequency converter are three-phase alternating current, and the output side three-phase alternating current is electrically. The inverters in the household appliance are such, usually the capacity is small.
Why is the voltage and current ratio of the frequency converter?
The torque of the non-synchronous motor is generated by interacting between the magnetic flux of the motor and the current flowing through the current, at the rated frequency, if the voltage is only reduced, then the magnetic flux is too large, the magnetic circuit is saturated, severe The motor will burn the motor. Therefore, the frequency is proportionally changed to the voltage, that is, the frequency of the frequency converter output voltage is changed, so that the magnetic flux of the motor is kept, avoiding weak magnetic and magnetic saturation. This control method is mostly used in the fan, the pump energy-saving frequency converter.
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