Double-damping mixed star connection vibration-free brake frequency conversion device

Abstract

The invention discloses a double-damping mixed star connection vibration-free brake frequency conversion device comprising a frequency converter including a main control circuit; the double-damping mixed star connection vibration-free brake frequency conversion device also comprises two damping circuits and two solenoid valves; three output ends of each damping circuit are connected in series with a solenoid valve and correspondingly connected with three output ends of an inversion circuit; an control input end of the solenoid valve is connected with a damping control signal output end of the main control circuit; each damping circuit comprises three resistors and three capacitors, one resistor and one capacitor are connected in parallel to form a damping unit, and three damping units of each damping circuit are all in star connection. The resistors and the capacitors in the damping circuit are employed to consume the energy on the output end, i.e., the load end of the inversion circuit, thereby obtaining the purposes of no vibration, no noises, on overvoltage, on overcurrent, and no temperature rise brake; the main control circuit is employed to realize automatic control, and the double-damping mixed star connection vibration-free brake frequency conversion device is an updated product of a conventional poleless speed adjusting frequency converter.

Description

technical field [0001] The invention relates to a frequency conversion device, in particular to a double-damping hybrid star connection vibration-free braking frequency conversion device improved on the basis of a traditional frequency converter. Background technique [0002] Frequency converters are widely used in the field of industrial control, especially cascaded high-voltage frequency converters, which are important equipment for industrial control and speed regulation of high-power motors. Frequency converters and motors form a frequency conversion speed control system. [0003] Many inverter-driven motor applications require a braking function, that is, the ability to stop quickly and reduce speed quickly. This also includes fast shutdown applications for fans and pumps. In order to improve production efficiency, many steel mills put forward high requirements on the braking capacity of frequency converters. For example, the working cycle of a furnace of steel in a s...

AI Technical Summary

Problems solved by technology

[0009] To sum up, the disadvantages of traditional inverter braking technology are: complex control, serious increase in motor temperature, noise and vibration, and easy overvoltage or overcurrent tripping of the inverter during braking

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