CN104330628A - Brushless direct current motor counter electromotive force third harmonic detection circuit - Google Patents

Brushless direct current motor counter electromotive force third harmonic detection circuit Download PDF

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CN104330628A
CN104330628A CN201410641063.5A CN201410641063A CN104330628A CN 104330628 A CN104330628 A CN 104330628A CN 201410641063 A CN201410641063 A CN 201410641063A CN 104330628 A CN104330628 A CN 104330628A
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resistor
end
connected
power supply
5v
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CN201410641063.5A
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CN104330628B (en
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周闯
秦国辉
王玉鹏
刘旭丹
刘伟
徐晓秋
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黑龙江省科学院科技孵化中心
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Abstract

The invention discloses a brushless direct current motor counter electromotive force third harmonic detection circuit and relates to the field of motor control. The brushless direct current motor counter electromotive force third harmonic detection circuit aims at solving the problems that the existing counter electromotive force third harmonic detection circuit is low in signal detection accuracy, severe in signal attenuation, complex in circuit and large in motor reversing error caused by detected signals. A three-phase wire inlet end of the brushless direct current motor is respectively connected with one end of a resistor R3, one end of a resistor R4 and one end of a resistor R5; the other end of the resistor R3 is connected with the other end of the resistor R56; the other end of the resistor R4 is connected with a low pass filter; an output end of the low pass filter is connected with an input end of a voltage clamping circuit; an output end of the voltage clamping circuit is connected with an input end of a zero-crossing comparator; a zero potential fine turning circuit is connected with the input end of the zero-crossing comparator; an output end of the zero potential fine turning circuit is connected with an input end of an optoelectronic isolation circuit; an output end of the optoelectronic isolation circuit is connected with an input end of a DSP (Digital Signal Processor). The brushless direct current motor counter electromotive force third harmonic detection circuit can be applied to a motor.

Description

无刷直流电机反电动势三次谐波检测电路 Brushless DC motor third harmonic counter electromotive force detecting circuit

技术领域 FIELD

[0001 ] 本发明涉及无刷直流电机反电动势三次谐波检测电路。 [0001] The present invention relates to a brushless DC motor of the third harmonic counter electromotive force detecting circuit. 属于电机控制领域。 Belonging to the field of motor control.

背景技术 Background technique

[0002] 基于反电动势三次谐波过零点检测的无刷电机无位置传感器控制,较有位置传感器控制相比,能够减小电机的体积和传感器的成本,提高转子位置信号的抗干扰能力。 [0002] harmonic through the brushless motor detected by the zero position sensorless control based on the counter electromotive force three times, compared with a position sensor as compared to the control, the cost can be reduced and the volume of the sensor motor, improve the anti-interference ability of the rotor position signal. 现有的三次谐波检测电路中,三次谐波的获取方法是取外接星型等效电阻中性点和接地端之间的电势差,经过带通滤波后进行过零点检测。 Three conventional harmonic detection circuit, obtaining the third harmonic method is to take the potential difference between the equivalent resistance of the external star neutral and the ground terminal, after band-pass filtering for zero-crossing detection. 这种方法由于抬高了反电动势三次谐波信号的整体幅值,因此检测到的反电动势过零点不够准确,并且带通滤波器对三次谐波信号的衰减非常严重,不宜于过零点的有效检测。 Since this method is raising the overall amplitude of the third harmonic signal of the counter electromotive force, and therefore the detected counter electromotive force zero crossing is not accurate enough, and the band-pass filter attenuation of the third harmonic signal is very serious, not too active to zero detection.

发明内容 SUMMARY

[0003] 本发明是为了解决现有的反电动势三次谐波过零点检测电路中,存在的信号检测准确性低,信号衰减严重,电路复杂,检测到的信号导致电机换向误差大的问题。 [0003] The present invention is made to solve the error is large motor commutation problem existing back electromotive force of the third harmonic zero-crossing detection circuit, the presence of low signal detection accuracy, severe signal attenuation, circuit complexity, the detected signal results. 现提供无刷直流电机反电动势三次谐波检测电路。 Now it provides a third harmonic counter electromotive force detecting circuit brushless DC motor.

[0004] 无刷直流电机反电动势三次谐波检测电路,它包括无刷直流电机、星型电阻、电机直流供电电源中点电压、低通滤波器、零点电位微调电路、电压钳位电路、过零比较器、光电隔离电路和数字信号处理器DSP, [0004] The brushless DC motor counter electromotive force detecting circuit the third harmonic, comprising a brushless DC motor, a star resistor, the motor neutral voltage DC power supply, a low pass filter, trimming circuit zero potential, voltage clamping circuit, through zero-crossing comparator, optical isolation circuit and the DSP digital signal processor,

[0005] 所述星型电阻包括电阻R3、电阻R4和电阻R5, [0005] The star-type resistance comprises a resistor R3, resistor R4 and the resistor R5,

[0006] 所述无刷直流电机的三相进线端分别连接电阻R3的一端、电阻R4的一端和电阻R5的一端,电阻R3的另一端连接电阻R5的另一端,电阻R4的另一端作为星型电阻的输出端; [0006] The three-phase brushless DC motor into the line terminal of the resistor R3 are connected to one end of the other end, one end of the resistor R5 and one end of the resistor R4, the other end of the resistor R3 is connected to the resistor R5, the other end of the resistor R4 as Star resistor output terminal;

[0007] 低通滤波器包括电阻R8、电阻RlO和电容C2, [0007] The low pass filter comprises a resistor R8, a resistor RlO and capacitor C2,

[0008] 星型电阻的输出端连接电阻R8的一端,电阻R8的另一端同时连接电阻RlO的一端和电容C2的一端,电阻RlO的另一端连接电容C2的另一端,电阻R8的一端、电阻RlO的一端和电容C2的一端均作为低通滤波器的信号输出端,电阻RlO的另一端作为低通滤波器的信号输入端; [0008] The output of the star resistor resistor R8 is connected to one end, the other end of the resistor R8, while connecting one ends of the resistor RlO and the capacitor C2, the other end of the resistor RlO is connected to the other end of capacitor C2, resistor R8 one end of resistor one ends of RlO and capacitor C2 are output as a signal of the low pass filter, the other end of the resistor RlO as a signal input of the low pass filter;

[0009] 电机直流供电电源中点电压包括供电电源、电阻R1、电阻R2和供电电源的电源地, [0009] Motor midpoint voltage DC power supply includes a power supply, a resistor R1, a resistor R2, and power ground power supply,

[0010] 低通滤波器的信号输入端同时连接电阻Rl的一端和电阻R2的一端,电阻Rl的另一端连接供电电源,电阻R2的另一端连接供电电源的电源地, [0010] The signal input of the low pass filter is connected at one end while the one end of the resistor R2 and the resistor Rl, the other end of the resistor Rl is connected to the power supply, the other end of the resistor R2 is connected to power ground power supply,

[0011] 电压钳位电路包括5V供电电源的正极+5V、一号二极管Dl、二号二极管D2和5V供电电源的负极-5V, [0011] The voltage clamp circuit includes a positive power supply + 5V 5V, the 1st diode cathode -5V Dl, the 2nd diode D2 and the 5V power supply,

[0012] 低通滤波器的信号输出端同时连接一号二极管Dl的阳极和二号二极管D2的阴极,一号二极管Dl的阴极连接5V供电电源的正极+5V, 二号二极管D2的阳极连接5V供电电源的负极-5V,—号二极管Dl的阳极作为电压钳位电路的信号输出端, [0012] The signal output of the low pass filter One diode Dl connected to an anode while the cathode of diode D2 and II, Dl One diode cathode connected to the positive power supply + 5V 5V, II anode of diode D2 is connected 5V the negative power supply -5V, - number of diode Dl anode voltage clamping circuit as a signal output terminal,

[0013] 过零比较器包括5V供电电源、运算放大器U2、电阻R6和5V供电电源的电源地, [0013] The zero-crossing comparator comprising a ground power supply 5V supply, an operational amplifier U2, resistor R6 and 5V power supply,

[0014] 电压钳位电路的信号输出端连接运算放大器U2的正相信号输入端,运算放大器U2的正电源端同时连接5V供电电源和电阻R6的一端,运算放大器U2的负电源端连接5V供电电源的电源地,运算放大器U2的输出端连接电阻R6的另一端,运算放大器U2的负相信号输入端作为过零比较器的信号输入端,电阻R6的一端作为过零比较器的一个信号输出端,电阻R6的另一端作为过零比较器的另一个信号输出端, [0014] The signal output terminal of the voltage clamping circuit operational amplifier U2 is connected to the positive supply terminal of the positive-phase signal input terminal, while the operational amplifier U2 is connected to 5V power supply and one end of resistor R6, the negative power supply terminal of the operational amplifier U2 is connected to 5V power supply the other end of the output of the power supply, the operational amplifier U2 is connected to the resistor R6, an operational amplifier U2 is negative-phase signal input terminal of a zero-crossing comparator signal input terminal, a zero-cross comparator is a signal output terminal of the resistor R6 is end, the other end of the resistor R6 as a zero-crossing signal output of the other comparator,

[0015] 零点电位微调电路包括可调电阻R12、电阻R11、三号二极管D3、5V供电电源和5V供电电源的电源地, [0015] Zero voltage trimming circuit comprising an adjustable resistor R12, resistor R11, diode D3,5V III 5V power supply and power ground power supply,

[0016] 过零比较器的信号输入端连接可调电阻R12的可调端,可调电阻R12的一端同时连接电阻Rll的一端和三号二极管D3的阳极,电阻Rll的另一端连接5V供电电源,可调电阻R12的另一端同时连接三号二极管D3的阴极和5V供电电源的电源地, [0016] The signal input terminal is connected to the zero-crossing comparator variable resistor R12 adjustable end, the adjustable end of the resistor R12 is connected to an anode while the end of the resistor Rll and III diode D3, the other end of the resistor Rll is connected to 5V power supply. , the other end of the resistor R12 is adjustable while connected to the 3rd power and the cathode of diode D3 5V power supply,

[0017] 光电隔离电路包括电阻R7、型号为6N137的光电隔离器、电容C1、5V供电电源、5V供电电源的电源地、3.3V供电电源、3.3V供电电源的电源地和电阻R9, [0017] The optical isolation circuit includes a resistor R7, a model 6N137 optical isolator, the power supply capacitor C1,5V, 5V power supply ground power, 3.3V power supply, 3.3V power supply and ground supply resistor R9,

[0018] 过零比较器的一个信号输出端连接电阻R7的一端,电阻R7的另一端连接型号为6N137的光电隔离器的2号引脚,型号为6N137的光电隔离器的5号引脚连接3.3V供电电源的电源地,型号为6N137的光电隔离器的7号引脚同时连接型号为6N137的光电隔离器的8号引脚、电容Cl的一端和5V供电电源,电容Cl的另一端连接5V供电电源的电源地,型号为6N137的光电隔离器的6号引脚连接电阻R9的一端,电阻R9的另一端连接3.3V供电电源,过零比较器的另一个信号输出端连接型号为6N137的光电隔离器的3号引脚,型号为6N137的光电隔离器的6号引脚作为光电隔离电路的信号输出端, [0018] A signal output terminal of the zero-crossing comparator is connected one end of the resistor R7, the other end of the resistor R7 is connected Model No. 6N137 pin 2 of the optical isolator Model No. 6N137. 5 pin connector number of the optical isolator 3.3V power ground power supply, model No. 6N137 optoisolator in the 7-pin connector while the model 6N137 optoisolator No. 8 pin, one end of the other end of the capacitor Cl and the 5V power supply, is connected to capacitor Cl one end, the other end of the resistor R9 supply 5V power supply, a model 6N137 optoisolator in the pin 6 is connected to resistor R9 is connected 3.3V power supply, the zero-crossing comparator output terminal connected to the other signal model 6N137 photoelectric isolator pin No. 3, as a model for the optical isolation circuit pin signal output terminal of the optical isolator 6N137 No. 6,

[0019] 光电隔离电路的信号输出端连接数字信号处理器DSP的信号输入端。 Signal output terminal [0019] optical isolation circuit connected to the digital signal processor DSP signal input terminal.

[0020] 本发明的有益效果为:在无刷直流电机的三相进线端外接等效的星型连接电阻,并对电机直流供电电源中点电压M处和外接星形电阻中性点O处之间的电势差进行分压滤波,可经过过零比较器测得的反电动势三次谐波信号过零点更加准确。 [0020] Advantageous effects of the present invention are: three-phase line at the end of the brushless DC motor connected to an external star equivalent resistor, a DC power supply and the motor M at the neutral point voltage and the neutral point O of the external resistor star potential difference between the dividing filter, after zero-cross comparator can be measured by back-EMF zero crossings of the third harmonic signal more accurately. 经过-5V和5V组成的电压钳位电路,输入至由运算放大器组成的过零比较器的正向输入端,对三次谐波信号的过零信号进行检测,零点电位的微调电路用来比较电位的输入端,运算放大器的输出端输出相应的OV和5V的开关信号。 Through the voltage clamping circuit consisting of 5V and -5V, is input to the operational amplifier by the zero-crossing comparator positive input terminal of the third harmonic signal zero-crossing signal is detected, the potential of the trimming circuit for comparing the potential of 0:00 an input terminal, an output terminal of the operational amplifier outputs a corresponding switching signal OV and 5V. 再经过光电隔离器隔离输入端的干扰,输出OV和3.3V的开关信号到数字信号处理器DSP,该电路简单,采用光电隔离电路能够提高转子位置信号的抗干扰能力,并且与现有技术相比较没有传感器,使得该电路的成本减少了并且减小了电机的体积。 Then through the optical isolators isolate the interference input, the output signal OV and 3.3V switch to the digital signal processor of the DSP, the circuit is simple, using optical isolation circuit can be improved anti-interference ability of the rotor position signal, and compared with the prior art no sensor, such that the circuit reduces the cost and reduces the volume of the motor. 在对三次谐波的处理上,使用低通滤波器完全可以更简单更准确的获取到三次谐波信号,减小信号的衰减程度,有利于过零点的检测,加入正负电压箝位电路,可以有效防止电压突变,对型号为LM339的运放放大器实现一个很好的保护。 In the process of the third harmonic, low-pass filter can obtain simpler and more accurate signal to the third harmonic, to reduce the degree of attenuation of the signal, by detecting the zero facilitate adding the positive and negative voltage clamping circuit, It can effectively prevent voltage transients, on the model LM339 op amp amplifier to achieve a good protection. 零点电位微调电路,能够有效的对由于运算放大器LM339温度变化产生的零点漂移效应进行修正,使检测到的过零点时刻更加准确,进而无刷直流电机更加准确换向。 Trimming circuit zero potential, can effectively be more accurate since the effect of zero drift operational amplifiers LM339 temperature change is corrected so that the detected zero-crossing time point, and thus more accurate brushless DC motor commutation.

附图说明 BRIEF DESCRIPTION

[0021] 图1为具体实施方式一所述的无刷直流电机反电动势三次谐波检测电路的电路 Circuit [0021] FIG. 1 is a specific embodiment of the brushless DC motor of a third harmonic counter electromotive force detecting circuit

原理图。 Schematics. 具体实施方式 Detailed ways

[0022] 具体实施方式一:参照图1具体说明本实施方式,本实施方式所述的无刷直流电机反电动势三次谐波检测电路,它包括无刷直流电机Ul、星型电阻1、电机直流供电电源中点电压2、低通滤波器3、零点电位微调电路4、电压钳位电路5、过零比较器6、光电隔离电路7和数字信号处理器DSP8, [0022] In a particular embodiment: Referring to FIG 1 of the present embodiment specifically described embodiment, the present embodiment of the brushless DC motor of the third harmonic counter electromotive force detecting circuit, comprising Ul brushless DC motor, a star-type resistor, a DC motor midpoint voltage power supply 2, the low-pass filters 3, 4 trim the zero potential, voltage clamp circuit 5, the zero-crossing comparator 6, optical isolation circuit 7 and a digital signal processor, the DSP 8,

[0023] 所述星型电阻I包括电阻R3、电阻R4和电阻R5, [0023] I said star resistor includes a resistor R3, resistor R4 and the resistor R5,

[0024] 所述无刷直流电机Ul的三相进线端分别连接电阻R3的一端、电阻R4的一端和电阻R5的一端,电阻R3的另一端连接电阻R5的另一端,电阻R4的另一端作为星型电阻I的输出端; [0024] The other end of the three-phase line terminal Ul brushless DC motor are connected to one end of the resistor R3, one end of the resistor R5 and one end of the resistor R4, the other end of the resistor R3 is connected to the resistor R5, the other end of the resistor R4 type resistor as an output terminal I of the star;

[0025] 低通滤波器3包括电阻R8、电阻RlO和电容C2, [0025] The low pass filter 3 includes a resistor R8, a resistor RlO and capacitor C2,

[0026] 星型电阻I的输出端连接电阻R8的一端,电阻R8的另一端同时连接电阻RlO的一端和电容C2的一端,电阻RlO的另一端连接电容C2的另一端,电阻R8的一端、电阻RlO的一端和电容C2的一端均作为低通滤波器3的信号输出端,电阻RlO的另一端作为低通滤波器3的信号输入端; [0026] The other end of the output terminal of the star resistor I is connected to a resistor R8 one end of the resistor R8, while connecting one end of end of the resistor RlO and the capacitor C2, the other end of the resistor RlO is connected to the other end of the capacitor C2, the resistor end of R8, end end of the resistor RlO and capacitor C2 are used as the signal output of the low-pass filter 3, the other end of the resistor RlO as a signal input end of the low-pass filter 3;

[0027] 电机直流供电电源中点电压2包括供电电源、电阻Rl、电阻R2和供电电源的电源地, [0027] Motor midpoint voltage DC power supply 2 to the power supply includes a power supply, a resistor Rl, a resistor R2, and power supply,

[0028] 低通滤波器3的信号输入端同时连接电阻Rl的一端和电阻R2的一端,电阻Rl的另一端连接供电电源,电阻R2的另一端连接供电电源的电源地, Signal input terminal [0028] The low pass filter 3 is connected to one ends while the resistor R2 and the resistor Rl, the other end of the resistor Rl is connected to the power supply, the other end of the resistor R2 is connected to power ground power supply,

[0029] 电压钳位电路5包括5V供电电源的正极+5V、一号二极管D1、二号二极管D2和5V供电电源的负极-5V, [0029] The voltage clamp circuit 5 comprises a positive 5V power supply + 5V, One diode D1, a diode D2 and II negative power supply 5V -5V,

[0030] 低通滤波器3的信号输出端同时连接一号二极管Dl的阳极和二号二极管D2的阴极,一号二极管Dl的阴极连接5V供电电源的正极+5V, 二号二极管D2的阳极连接5V供电电源的负极-5V,—号二极管Dl的阳极作为电压钳位电路5的信号输出端, [0030] The signal output of the low pass filter 3 is connected to an anode One diode Dl while the cathode of diode D2 and II, Dl One diode cathode connected to the positive power supply + 5V 5V, II connected to the anode of the diode D2 -5V 5V negative power supply, - number of diode Dl anode voltage clamping circuit 5 as a signal output terminal,

[0031 ] 过零比较器6包括5V供电电源、运算放大器U2、电阻R6和5V供电电源的电源地, [0031] The zero-cross comparator 6 includes a power supply to the power supply 5V, the operational amplifier U2, resistor R6 and 5V power supply,

[0032] 电压钳位电路5的信号输出端连接运算放大器U2的正相信号输入端,运算放大器U2的正电源端同时连接5V供电电源和电阻R6的一端,运算放大器U2的负电源端连接5V供电电源的电源地,运算放大器U2的输出端连接电阻R6的另一端,运算放大器U2的负相信号输入端作为过零比较器6的信号输入端,电阻R6的一端作为过零比较器6的一个信号输出端,电阻R6的另一端作为过零比较器6的另一个信号输出端, [0032] The signal output of the voltage clamp circuit 5 is connected to the operational amplifier U2 is positive-phase signal input terminal, a positive power supply terminal of the operational amplifier U2 is connected to one end while the 5V power supply and the resistor R6, the negative power supply terminal of the operational amplifier U2 is connected to 5V power supply supply, the output of the operational amplifier U2 is connected to the other end of the resistor R6, an operational negative amplifier U2-phase signal input terminal of a zero-crossing signal input terminal of the comparator 6, the end of the resistor R6 as a zero-crossing comparator 6 a signal output terminal, the other end of the resistor R6 as a zero signal output terminal through the other comparator 6,

[0033] 零点电位微调电路4包括可调电阻R12、电阻R11、三号二极管D3、5V供电电源和5V供电电源的电源地, [0033] Zero voltage trimming circuit 4 comprises an adjustable power supply to the resistor R12, resistor R11, diode D3,5V III 5V power supply and power supply,

[0034] 过零比较器6的信号输入端连接可调电阻R12的可调端,可调电阻R12的一端同时连接电阻Rll的一端和三号二极管D3的阳极,电阻Rll的另一端连接5V供电电源,可调电阻R12的另一端同时连接三号二极管D3的阴极和5V供电电源的电源地, [0034] The zero-crossing signal input terminal of the comparator 6 is connected to the adjustable end of the adjustable resistor R12, the resistor R12 while the adjustable end connected to an anode end of the resistor Rll and III diode D3, the other end of the resistor Rll is connected to 5V power supply power supply, the other end of the variable resistor R12 is connected to the power supply while the cathode of diode D3 and III 5V power supply,

[0035] 光电隔离电路7包括电阻R7、型号为6N137的光电隔离器U3、电容C1、5V供电电源、5V供电电源的电源地、3.3V供电电源、3.3V供电电源的电源地和电阻R9, [0035] The optical isolation circuit 7 comprises a resistor R7, a model 6N137 optical isolator U3, power supply to the resistor R9 and capacitor C1,5V power supply, 5V power supply ground power, 3.3V power supply, 3.3V power supply,

[0036] 过零比较器6的一个信号输出端连接电阻R7的一端,电阻R7的另一端连接型号为6N137的光电隔离器U3的2号引脚,型号为6N137的光电隔离器U3的5号引脚连接3.3V供电电源的电源地,型号为6N137的光电隔离器U3的7号引脚同时连接型号为6N137的光电隔离器U3的8号引脚、电容Cl的一端和5V供电电源,电容Cl的另一端连接5V供电电源的电源地,型号为6N137的光电隔离器U3的6号引脚连接电阻R9的一端,电阻R9的另一端连接3.3V供电电源,过零比较器6的另一个信号输出端连接型号为6N137的光电隔离器U3的3号引脚,型号为6N137的光电隔离器U3的6号引脚作为光电隔离电路7的信号输出端, End [0036] signal through a zero crossing comparator output terminal 6 is connected to the resistor R7, the other end of the resistor R7 is connected to a Model 6N137 optical isolator U3, pin No. 2, Model No. 6N137. 5 of the optical isolator U3, 3.3V power supply pin is connected to the power supply, model No. 6N137. 7 of the optical isolator U3 pin connector while the model 6N137 optical isolator U3, pin 8, and one end of the capacitor Cl 5V power supply, capacitor another pin 6 at one end, the other end of the resistor R9 is connected to the other end of the resistor R9 is Cl 5V power supply is connected to power ground, a model 6N137 optoisolator U3 is connected to 3.3V power supply, the zero-crossing comparator 6 signal output terminal connected to a model 6N137 optoisolator pin 3 of U3, model No. 6N137. 6 of the optical isolator U3, pin as signal output terminal 7 of the optical isolation circuit,

[0037] 光电隔离电路7的信号输出端连接数字信号处理器DSP8的信号输入端。 [0037] The optical isolation circuit signal output terminal 7 is connected to the signal input of the digital signal processor of DSP8.

[0038] 本实施方式中,数字信号处理器DSP8的信号输出端捕捉到光电隔离电路输出的开关信号的跳变沿产生捕获中断,DSP根据捕获的过零点信号按照预先编制好的顺序进行换向,驱动无刷直流电机转动。 [0038] In the present embodiment, the signal output of the digital signal processor DSP8 breaker captured signal output from the variable optical isolation circuit along capture interrupt, the DSP according to the commutation sequence pre-programmed in accordance with a zero crossing signal acquisition , brushless DC motor drive rotates.

[0039] 具体实施方式二:本实施方式是对具体实施方式一所述的无刷直流电机反电动势三次谐波检测电路作进一步说明,本实施方式中,数字信号处理器DSP8采用型号为TMS320F2812 实现。 [0039] DETAILED Embodiment 2: This embodiment is a specific embodiment of the brushless DC motor counter electromotive force detecting circuit for the third harmonic is further described, according to the present embodiment, the digital signal processor DSP8 implemented using model TMS320F2812 .

[0040] 具体实施方式三:本实施方式是对具体实施方式一所述的无刷直流电机反电动势三次谐波检测电路作进一步说明,本实施方式中,运算放大器U2采用型号为LM339实现。 [0040] DETAILED Embodiment 3: Embodiment of the present embodiment is a specific embodiment of a brushless DC motor of the third harmonic counter electromotive force detecting circuit is further illustrated, in this embodiment, operational amplifier U2 implemented using model LM339.

[0041] 工作原理:在无刷直流电机的三相入线端外接等效的星型连接电阻,并对直流电源中点M处和外接星形电阻中性点O处之间的电势差进行分压滤波,可得到反电动势三次谐波信号。 [0041] The working principle: the three-phase brushless DC motor cable end external equivalent star connection resistance, and the potential difference between the middle point M of the DC power source and an external resistor star dividing the neutral point O pressure filter, a counter electromotive force of the third harmonic signal can be obtained. 经过-5V和5V组成的电压钳位电路,输入至由运算放大器LM339组成的过零比较器的正向输入端,对三次谐波信号的过零信号进行检测,运算放大器LM339的反向输入端比较电位的输入端,连接的是零点电位的微调电路,输出端输出相应的OV和5V的开关信号。 Through the voltage clamping circuit consisting of 5V and -5V, is input to an operational amplifier LM339 consisting of zero-crossing comparator positive input terminal, a third harmonic signal of the zero-crossing signal is detected inverting input terminal, the operational amplifier LM339 comparison of the potential input terminal, a trimming circuit is connected to zero potential, the output terminal of the respective switching signal OV and 5V. 再经过光电隔离器6N137隔离输入端的干扰,输出OV和3.3V的开关信号到DSP,DSP捕捉到开关信号的跳变沿产生捕获中断,DSP根据捕获的过零点信号按照预先编制好的顺序进行换向,驱动电机转动。 Then after isolation interference 6N137 input optical isolator, the output of the switching signal OV and 3.3V to the DSP, DSP capture signal becomes breaker edge capture interrupt, the DSP transducer zero-crossing signal in accordance with the captured sequence according to a pre-programmed the drive motor is rotated.

Claims (3)

1.无刷直流电机反电动势三次谐波检测电路,其特征在于,它包括无刷直流电机(U1)、星型电阻(I)、电机直流供电电源中点电压(2)、低通滤波器(3)、零点电位微调电路(4)、电压钳位电路(5)、过零比较器(6)、光电隔离电路(7)和数字信号处理器DSP(8), 所述星型电阻(I)包括电阻R3、电阻R4和电阻R5, 所述无刷直流电机(Ul)的三相进线端分别连接电阻R3的一端、电阻R4的一端和电阻R5的一端,电阻R3的另一端连接电阻R5的另一端,电阻R4的另一端作为星型电阻(I)的输出端; 低通滤波器⑶包括电阻R8、电阻RlO和电容C2, 星型电阻(I)的输出端连接电阻R8的一端,电阻R8的另一端同时连接电阻RlO的一端和电容C2的一端,电阻RlO的另一端连接电容C2的另一端,电阻R8的一端、电阻RlO的一端和电容C2的一端均作为低通滤波器(3)的信号输出端,电阻RlO的另一端作为低通滤波器(3)的信 1. The brushless DC motor counter electromotive force detecting circuit of the third harmonic, characterized in that it comprises a brushless DC motor (Ul), star-shaped resistor (the I), the midpoint of the motor voltage DC power supply (2), a low pass filter (3) the zero potential of the trimming circuit (4), a voltage clamp circuit (5), the zero-crossing comparator (6), optical isolation circuit (7) and a digital signal processor DSP (8), said star resistor ( I) comprises a resistor R3, resistor R4 and the resistor R5, the brushless DC motor (Ul) of the three-phase line terminals are connected to one end of the resistor R3, one end of the resistor R5 and one end of the resistor R4, the other end of the resistor R3 is connected the other end of resistor R5, the other end of the resistor R4 is a resistor star (I) an output terminal; ⑶ comprises a low pass filter R8, a resistor RlO and capacitor C2, a resistor star (I) output terminal of resistor R8 is connected to a resistor the other end of the one end of the resistor R8 simultaneously connected one ends of the resistor RlO and the capacitor C2, the other end of the resistor RlO is connected to the other end of the capacitor C2, one end of the resistor R8, one end of the resistor RlO and one end of the capacitor C2 are used as low-pass filtering (3) a signal output terminal, the other end of the resistor RlO as the low-pass filter (3) letter 输入端; 电机直流供电电源中点电压(2)包括供电电源、电阻R1、电阻R2和供电电源的电源地,低通滤波器(3)的信号输入端同时连接电阻Rl的一端和电阻R2的一端,电阻Rl的另一端连接供电电源,电阻R2的另一端连接供电电源的电源地, 电压钳位电路(5)包括5V供电电源的正极+5V、一号二极管Dl、二号二极管D2和5V供电电源的负极-5V, 低通滤波器(3)的信号输出端同时连接一号二极管Dl的阳极和二号二极管D2的阴极,一号二极管Dl的阴极连接5V供电电源的正极+5V, 二号二极管D2的阳极连接5V供电电源的负极-5V,—号二极管Dl的阳极作为电压钳位电路(5)的信号输出端, 过零比较器(6)包括5V供电电源、运算放大器(U2)、电阻R6和5V供电电源的电源地,电压钳位电路(5)的信号输出端连接运算放大器(U2)的正相信号输入端,运算放大器U2的正电源端同时连接5V供电电源和电阻R6的 An input terminal; a motor midpoint voltage DC power supply (2) comprises a power supply, a resistor R1, a resistor R2, and power supply to supply low-pass filter (3) while the signal input terminal connected to one end of the resistor Rl and the resistor R2 one end, the other end of the resistor Rl is connected to the power supply, the other end of the resistor R2 is connected to supply the power supply, the voltage clamp circuit (5) comprises a positive power supply + 5V 5V, One diode Dl, the diode D2 and 5V II -5V negative power supply, low-pass filter (3) while the signal output terminal connected to an anode One diode Dl II and cathode of diode D2, the diode Dl One cathode connected to the positive power supply + 5V 5V, two number anode of diode D2 connected to the negative power supply 5V -5 V, - number of diode Dl anode as a voltage clamp circuit (5) signal output terminal, the zero-crossing comparator (6) comprises a 5V power supply, the operational amplifier (U2) , and the signal output end of the resistor R6 supply 5V power supply, the voltage clamp circuit (5) is connected to the operational amplifier (U2) of the positive-phase signal input terminal, a positive power supply terminal of the operational amplifier U2 is connected to 5V power supply and at the same time the resistor R6 of 端,运算放大器U2的负电源端连接5V供电电源的电源地,运算放大器(U2)的输出端连接电阻R6的另一端,运算放大器(U2)的负相信号输入端作为过零比较器(6)的信号输入端,电阻R6的一端作为过零比较器(6)的一个信号输出端,电阻R6的另一端作为过零比较器(6)的另一个信号输出端, 零点电位微调电路(4)包括可调电阻R12、电阻R11、三号二极管D3、5V供电电源和5V供电电源的电源地, 过零比较器(6)的信号输入端连接可调电阻R12的可调端,可调电阻R12的一端同时连接电阻Rll的一端和三号二极管D3的阳极,电阻Rll的另一端连接5V供电电源,可调电阻R12的另一端同时连接三号二极管D3的阴极和5V供电电源的电源地, 光电隔离电路(7)包括电阻R7、型号为6N137的光电隔离器(U3)、电容Cl、5Va供电电源、5Va供电电源的电源地、3.3Va供电电源、3.3Va供电电源的电源地和电阻R9, 过 The other end of the negative power supply side terminal of the operational amplifier U2 is connected to 5V power supply supply, the operational amplifier (U2) connected to the output resistor R6, a negative operational amplifier (U2) phase signal input terminal of a zero-crossing comparator (6 ) signal input terminal, one end of the resistor R6 as a zero-crossing comparator (6) is a signal output terminal, the other end of the resistor R6 as a zero-crossing comparator (6) is another signal output terminal, zero voltage trimming circuit (4 ) comprises an adjustable resistor R12, resistor R11, diode D3,5V III 5V power supply and supply the power supply, the zero-cross comparator (6) connected to a signal input of the adjustable end of the adjustable resistor R12, variable resistor One end of R12 is connected to an anode while the end of the resistor Rll and III diode D3, the other end of the resistor Rll is connected to 5V power supply, the other end of the resistor R12 is adjustable while connected to the power supply and the cathode of diode D3 Three 5V power supply, optical isolation circuit (7) comprises a resistor R7, a model 6N137 optoisolator (U3), capacitors Cl, 5Va power supply, 5Va supply to the power supply, 3.3Va power supply, 3.3Va power supply and ground supply resistor R9 , too 比较器¢)的一个信号输出端连接电阻R7的一端,电阻R7的另一端连接型号为6N137的光电隔离器(U3)的2号引脚,型号为6N137的光电隔离器(U3)的5号引脚连接3.3Va供电电源的电源地,型号为6N137的光电隔离器(U3)的7号引脚同时连接型号为6N137的光电隔离器(U3)的8号引脚、电容Cl的一端和5Va供电电源,电容Cl的另一端连接5Va供电电源的电源地,型号为6N137的光电隔离器(U3)的6号引脚连接电阻R9的一端,电阻R9的另一端连接3.3Va供电电源,过零比较器(6)的另一个信号输出端连接型号为6N137的光电隔离器(U3)的3号引脚,型号为6N137的光电隔离器(U3)的6号引脚作为光电隔离电路(7)的信号输出端, 光电隔离电路(7)的信号输出端连接数字信号处理器DSP(8)的信号输入端。 One end, the other terminal of the comparator ¢) signal output terminal connected to a resistor R7 resistor R7 is connected to a Model 6N137 optoisolator (U3) of the pin No. 2, a model 6N137 optoisolator (U3) No. 5 pin connector 3.3Va power ground power supply, a model 6N137 optoisolator (U3) of the 7-pin connector while the model 6N137 optoisolator (U3) No. 8 pin, one end of the capacitor Cl and 5Va pin 6 at one end, the other end of the resistor R9, the other end of the power supply, the capacitor Cl is connected to the power supply 5Va power ground, a model 6N137 optoisolator (U3) is connected to the resistor R9 is connected 3.3Va power supply, the zero-crossing another output signal of the comparator (6) is connected to a model 6N137 optoisolator (U3) to pin No. 3, a model 6N137 optoisolator (U3) of the pin 6 as optical isolation circuit (7) a signal output terminal, a signal output terminal of optical isolation circuit (7) is connected to the signal input of the digital signal processor DSP (8) a.
2.根据权利要求1所述的无刷直流电机反电动势三次谐波检测电路,其特征在于,数字信号处理器DSP(8)采用型号为TMS320F2812实现。 2. A brushless DC motor according to a third harmonic counter electromotive force detecting circuit as claimed in claim, wherein the digital signal processor DSP (8) using the model to achieve TMS320F2812.
3.根据权利要求1所述的无刷直流电机反电动势三次谐波检测电路,其特征在于,运算放大器U2采用型号为LM339实现。 3. A brushless DC motor according to claim 1, the third harmonic counter electromotive force detecting circuit, characterized in that the operational amplifier U2 implemented using model LM339.
CN201410641063.5A 2014-11-12 2014-11-12 Brushless DC motor third harmonic counter electromotive force detecting circuit CN104330628B (en)

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