Mine anti-explosion frequency conversion device with low switching frequency

Abstract

The invention discloses a mine anti-explosion frequency conversion device with low switching frequency, belonging to the technical field of mine equipment. The device comprises a three-phase AC (Alternating Current) power supply, a three-phase transformer, a three-phase electric reactor, an insulated gate bipolar transistor, an asynchronous cage type motor, a drive circuit, a control center, a rectifier, an inverter, a voltage detection device, a current detection device and a temperature detection device, wherein the three-phase AC power supply is connected with the three-phase transformer, the three-phase transformer is connected with the rectifier through the three-phase electric reactor, the rectifier is connected with the inverter, the inverter is connected with the asynchronous cage type motor, and the rectifier is connected with the control center through the insulated gate bipolar transistor. The device disclosed by the invention has the beneficial effects of reducing switching loss, reducing heat and realizing the anti-explosion requirements of a frequency converter.

Description

technical field [0001] The invention relates to an explosion-proof frequency conversion device, in particular to a mine explosion-proof frequency conversion device with low switching frequency, belonging to the technical field of mining equipment. Background technique [0002] The frequency converter makes the motor control system high-performance and low-loss. However, due to the characteristics of high gas content and high humidity in the underground environment of coal mines, general-purpose frequency converters cannot be used underground. In recent years, various mining explosion-proof frequency converters have been developed at home and abroad, but the power does not exceed 500kW. [0003] At present, explosion-proof inverters with high power and low switching frequency cannot be provided in China. Most inverters use voltage space vector control (SVPWM). As the power level increases, the switching loss of inverter switching devices increases, and becomes an inverter Th...

AI Technical Summary

Problems solved by technology

[0003] At present, explosion-proof inverters with high power and low switching frequency cannot be provided in China. Most inverters use voltage space vector control (SVPWM). With the increase of power level, the switching loss of inverter switching devices increases, and becomes The main loss of the inverter, while generating a lot of heat, because the voltage cannot be limited, so it is not suitable for the explosion-proof requirements of the downhole inverter

Images