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

A technology of star connection and frequency conversion device, which is applied in the direction of AC motor deceleration device, electric motor/converter plug, intermediate conversion to DC conversion equipment, etc., which can solve the problem of increased motor temperature, noise and vibration, and complicated control , The inverter is prone to overvoltage or overcurrent tripping, etc., to achieve the effect of precise braking control

CN103633855AInactive Publication Date: 2014-03-12CHENGDU COLDPLAY NETWORK TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-03-12
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing:

[0020] like figure 1 , figure 2 and image 3 As shown, the dual-damping hybrid star-connected vibration-free braking frequency conversion device of the present invention includes a frequency converter, and the frequency converter includes a power supply circuit, a rectification circuit, an inverter circuit, a main control circuit, a drive circuit, a voltage sampling circuit and a current Sampling circuit, the input end of the rectification circuit is connected to the three fire wires R, S, T of the three-phase power supply, the output end of the rectification circuit is connected to the input end of the inverter circuit, the three-phase output end of the inverter circuit is connected to the three-phase output end of the load motor M The power supply input terminals U, V, and W are connected, and the voltage sampling circuit and the current sampling circuit respectively s...