An AC Speed Regulating System Applicable to Mine Fan
A technology of AC speed regulation and fan, applied in the control system, vector control system, AC motor control, etc., can solve the problems of large harmonic content and low power factor, and achieve small harmonic content, high power density, and small capacity Effect
Inactive Publication Date: 2015-10-14
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
However, the traditional cascade speed regulation has disadvantages such as low power factor and large harmonic content.
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[0010] The structure and principle of an AC speed regulation system suitable for mine fans provided by the patent of the present invention will be explained in detail below in conjunction with the accompanying drawings.
[0011] see figure 1 , an AC speed control system suitable for mine fans, including: AC excitation power supply 1, wound asynchronous motor 2, digital control system 3 and A / D sampling module 4, wound asynchronous motor 2 includes a three-phase stator and The three-phase rotor, the three-phase stator of the wound asynchronous motor 2 is directly connected to the three-phase power grid 5; the input side of the AC excitation power supply 1 is connected to the three-phase power grid 5, and the output side is connected to the three-phase rotor of the wound asynchronous motor 2, It is used to realize the frequency conversion and speed regulation of the rotor side of the wound asynchronous motor 2; the A / D sampling module 4 is used to collect the current, voltage an...
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An alternating current speed regulating system suitable for a mine ventilator comprises an alternating current excitation source, a winding type asynchronous motor, a digital control system and an analogue-digital (A / D) sampling module. The winding type asynchronous motor comprises a three-phase stator and a three-phase rotor, wherein the three-phase stator of the winding type asynchronous motor is directly connected with a three-phase power grid. An input side of the alternating current excitation source is connected with the three-phase power grid, and an output side is connected with the three-phase rotor of the winding type asynchronous motor so as to achieve variable frequency speed regulation on a rotor side of the winding type asynchronous motor. The digital control system is respectively connected with the alternating current excitation source and the A / D sampling module and used for controlling the winding type asynchronous motor, achieving motor rotating speed closed-loop control and giving a triggering pulse signal according to data acquired by the A / D sampling module. The A / D sampling module is used for acquiring current, voltage and the rotating speed signal of the winding type asynchronous motor. The alternating current speed regulating system has the advantages of being small in frequency converter capability, low in cost, high in input power factor and low in harmonic content.
Description
technical field [0001] The invention relates to the field of application of a variable frequency speed regulation system for a fan of a mine hoist, in particular to an AC speed regulation system suitable for a mine fan. Background technique [0002] Fan is an important rotating equipment in coal mine production. At present, the methods used to adjust the air volume of mine hoist fans mainly include adjusting valve opening, high-voltage frequency conversion speed regulation and cascade speed regulation. Adjusting the air volume by adjusting the opening of the valve will consume about 30% of the energy on the adjusting valve, which is an adjustment method with high energy consumption and poor efficiency. High-voltage frequency conversion speed regulation is a speed regulation method used in mine fans in recent years. This method belongs to the frequency conversion technology on the stator side. The capacity of the frequency converter is large and the cost is high; Smaller ca...
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IPC IPC(8): H02P25/02H02P21/14H02P27/16H02J3/01H02J3/18H02P21/28H02P25/024
CPCY02E40/30Y02E40/40
Inventor 姜建国王晶鑫罗左东升戴鹏徐亚军吴玮王贵峰
Owner SHANGHAI JIAOTONG UNIV