Mine 10 KV anti-explosion frequency converter and method for controlling motor through same

An explosion-proof frequency converter and motor technology, which is applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of difficult to realize redundant design, large harmonic distortion, and different, etc., and achieve flexible and convenient speed adjustment, harmonic The effect of less pollution and high precision

Inactive Publication Date: 2017-06-13
华夏天信智能物联股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the current frequency converters have different dynamic resistances and polar capacitances, and there are steady-state and dynamic voltage equalization problems. In addition, if the three-level structure is adopted, the harmonic distortion is still relatively large, and output filtering is required. It is not easy to implement redundant design, and the requirements for withstand voltage of power devices are relatively high, and the output voltage level is limited to a certain extent.

Method used

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  • Mine 10 KV anti-explosion frequency converter and method for controlling motor through same
  • Mine 10 KV anti-explosion frequency converter and method for controlling motor through same
  • Mine 10 KV anti-explosion frequency converter and method for controlling motor through same

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Embodiment 1

[0032] Such as figure 1 As shown, a mine-used 10KV explosion-proof frequency converter of the present invention includes: an input transformer module, a power unit module, and an active control module; the input transformer module is connected to the power unit module; the active control module controls the power unit module; the power unit module includes: 3 parallel-connected power inverters, and after the power inverters are connected in parallel, the common output end is connected to the motor; each of the power inverters includes: 5 Single-phase inverter units connected in series.

[0033] Using this method is because each power inverter has the same structure, which is convenient for modular design and manufacture, and the system has high reliability. In addition, because this circuit can make the output voltage waveform of the inverter very close to a sine wave, there is no harmonic The problem of additional heating and torque pulsation of the motor caused by the wave,...

Embodiment 2

[0047] Such as figure 2 As shown, the present invention also relates to a method of controlling an electric motor utilizing a mining explosion-proof frequency converter, the method comprising the following steps:

[0048] S1, judging whether the current power-on condition is met;

[0049] S2, when the start-up conditions are met, the digital signal processor outputs a ready signal, and at the same time receives a start-up instruction transmitted locally or remotely;

[0050] S3, according to the received start-up command, the active control module starts the cycle detection operation mode to perform vector control adjustment on the power unit module;

[0051] S4, the active control module controls the power unit module to output a corresponding PWM waveform, thereby controlling the motor.

[0052] Preferably, the method further includes: when the digital signal processor receives a shutdown instruction or a signal that a shutdown is required during operation, the active con...

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Abstract

The invention relates to a mine 10 KV anti-explosion frequency converter and a method for controlling a motor through the same. According to the frequency converter, an input transformer module is connected with a power unit module, and an active control module controls the power unit module; the power unit module comprises three power inverters connected in parallel, and the common output end of the power inverter connected in parallel is connected with the motor; each power inverter comprises five single-phase frequency converter units connected in series. The method includes the steps that a digital signal processor receives a startup instruction; the active control module starts a circular detection operation mode for vector control regulation of the power unit module; the active control module controls the power unit module to output a corresponding PWM waveform, and accordingly the motor is controlled. The structure of the converter is made simple, the method is suitable for 10 kV high-voltage input, and the output voltage waveform of the frequency converter is very close to a sine wave, so that motor additional heating and torque ripples caused by harmonic waves do not exist, and the control reliability of the frequency converter is high.

Description

technical field [0001] The invention relates to the technical field of frequency converters for mines, in particular to a 10KV explosion-proof frequency converter for mines and a method for controlling a motor thereof. Background technique [0002] With the rapid development of modern power electronics technology, frequency converters have been more and more widely used in many fields, such as various textiles, machinery, lighting, computer control, etc., and are also used in various electrical equipment in coal mines. Mine-used inverters use power grid energy as the driving energy to drive special motors. Mine-used inverters are used in the four major working conditions of mines such as communication, drainage, compression, and lifting, as well as in the mechanical systems of coal mine mining, excavation, and transportation. It has been widely used, and due to the harsh working environment of the current underground coal mine, it is bound to have higher requirements for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02P27/08
CPCH02M5/458H02P27/085
Inventor 蒲绍宁高强陈旸陈晓彦
Owner 华夏天信智能物联股份有限公司
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