【摘要】：闡述了傳統(tǒng)離心泵轉(zhuǎn)速測量方法及其存在的問題,提出了基于電動機(jī)電流信號分析(MCSA)測量離心泵轉(zhuǎn)速的方法,應(yīng)用信號處理理論,對方法的原理進(jìn)行了數(shù)學(xué)推導(dǎo).應(yīng)用驅(qū)動電動機(jī)通電后定子繞組中存在與轉(zhuǎn)子頻率相同電流的原理,利用MCSA方法,分析電動機(jī)定子電流信號成分,從定子電流頻譜中檢測出轉(zhuǎn)子頻率.根據(jù)方法的原理設(shè)計(jì)了驗(yàn)證試驗(yàn),試驗(yàn)過程中,變頻器產(chǎn)生不同頻率的電源為電動機(jī)供電,調(diào)節(jié)離心泵的流量,運(yùn)用霍爾元件和數(shù)據(jù)采集卡,采集離心泵驅(qū)動電動機(jī)在不同流量下的定子電流信號,信號經(jīng)過解調(diào)和快速傅里葉變換(FFT),在限定的轉(zhuǎn)頻范圍,從電流頻譜中得到轉(zhuǎn)頻.為了驗(yàn)證方法的準(zhǔn)確性,用動靜干涉機(jī)理測速法和光學(xué)測速法進(jìn)行了對比試驗(yàn),試驗(yàn)結(jié)果表明:與光學(xué)測速以及動靜干涉機(jī)理測速相比,基于MCSA的轉(zhuǎn)速測量方案的誤差均在2%以內(nèi),滿足離心泵狀態(tài)監(jiān)測的要求,實(shí)現(xiàn)了離心泵轉(zhuǎn)速的無傳感器測量,精度較高,適用性強(qiáng).研究結(jié)果具有一定的應(yīng)用價值.
[Abstract]:This paper expounds the traditional measuring method of centrifugal pump speed and its existing problems, and puts forward a method of measuring centrifugal pump speed based on motor current signal analysis (MCSA). The theory of signal processing is applied to derive the principle of the method. Based on the principle that the stator winding has the same current as the rotor frequency after the driving motor is electrified, the signal components of the stator current of the motor are analyzed by using MCSA method, and the rotor frequency is detected from the frequency spectrum of the stator current. According to the principle of the method, the verification test is designed. In the course of the test, the inverter produces different frequency power supply for the motor, adjusts the flow rate of the centrifugal pump, and uses Hall element and data acquisition card. The stator current signals of centrifugal pump driven motor at different flow rates were collected. The signal was demodulated and (FFT), was used to obtain the frequency conversion from the current spectrum. In order to verify the accuracy of the method, the static and static interference mechanism velocimetry method and the optical velocimetry method are used to carry out the comparative tests. The experimental results show that: compared with the optical velocimetry and the static and static interference mechanism velocimetry, The error of speed measurement scheme based on MCSA is less than 2%, which meets the requirement of centrifugal pump condition monitoring, and realizes the sensorless measurement of centrifugal pump speed, which has high accuracy and strong applicability. The research results have certain application value.
【作者單位】： 江蘇大學(xué)國家水泵及系統(tǒng)工程技術(shù)研究中心;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51409125) 江蘇高校優(yōu)勢學(xué)科建設(shè)工程項(xiàng)目
【分類號】：TH311

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