CN102629845B - Position detection circuit of three-phase motor rotor based on rotary transformer - Google Patents
Position detection circuit of three-phase motor rotor based on rotary transformer Download PDFInfo
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- CN102629845B CN102629845B CN201210090562.0A CN201210090562A CN102629845B CN 102629845 B CN102629845 B CN 102629845B CN 201210090562 A CN201210090562 A CN 201210090562A CN 102629845 B CN102629845 B CN 102629845B
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Abstract
The invention provides a position detection circuit of a three-phase motor rotor based on a rotary transformer and belongs to the technical field of signal detection and processing as well as brushless motors. The position detection circuit is characterized by comprising a clock generator, a logic controller, a driving circuit, the rotary transformer and a signal conditioning module, wherein a shift register in the logic controller generates an SPWM (Sine Pulse Width Modulation) signal through cyclic shift, the SPWM signal is taken as an excitation signal of the rotary transformer after passing through the driving circuit, and an orthogonal analog signal outputted by the rotary transformer is generated into a digital signal after being conditioned by a comparator and an amplifier; and then, the logic controller carries out logical processing to the digital signal to obtain a square wave signal corresponding to the rotor in position and mutually forming 120 degrees with the digital signal as a position signal of the three-phase motor rotor. Compared with a Hall sensor, the three-phase motor rotor position detection circuit provided by the invention has the advantages of good stability and difficulty in interference.
Description
Technical field
The invention belongs to input and processing and brushless electric machine technical field.
Background technology
In driving and the SERVO CONTROL field of brushless electric machine, the position signalling that need obtain rotor by rotor-position sensor is controlled to realize commutation.And in current brushless electric machine control program, be mostly to adopt Hall element to realize the detection of rotor-position.Its advantage is that circuit is simple, easy to use, but has the shortcomings such as fearness is shaken, To Be Protected from Heat, be afraid of to disturb, fragile.The present invention utilizes resolver as rotor-position sensor, by its output just, cosine analog signal conditioner resolves the three-phase square wave signal for mutually differing 120 °, overcome the above-mentioned shortcoming of Hall element.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of simple and convenient, good stability, utilize resolver to carry out the method for rotor-position detection.
Three phase electric machine rotor position detection circuit based on resolver, is characterized in that, contains: clock generator, logic controller, drive circuit, resolver and signal condition module, wherein:
Shift register in clock generator and logic controller is connected, described shift register be take clock signal that clock generator produces and is carried out cyclic shift as sequential benchmark, output two paths of signals, one road signal is SPWM (the Sine Pulse Width Modulated of excitation resolver, sinusoidal pulse width modulation) signal, be connected to drive circuit and carry out current drives, another road signal is for latching triggering signal, when SPWM signal phase is 90 °, produce a trailing edge, be attached to the clock pulse input terminal of latch L1, L2 and L3 in logic controller;
Drive circuit carries out current drives to the SPWM signal of logic controller output, and the signal after driving, as resolver pumping signal, exports the excitation input of resolver to;
Resolver under described pumping signal effect, output reflection rotor-position and have orthogonality relation just, cosine differential signal: U
sin=U
msin (ω t) sin (θ) and U
cos=U
msin (ω t) cos (θ), wherein U
mfor the maximum amplitude of output signal, the angular frequency that ω is pumping signal, θ is rotor position angle, described just, cosine differential signal exports signal condition module to;
Signal condition module is nursed one's health the orthogonal simulation signal of resolver output: sinusoidal differential signal is attached to voltage comparator OPA1, compares processing, obtains digital signal A, exports latch L1 to; Cosine differential signal is attached to operational amplifier OPA2, carrying out 1: 1 backward difference amplifies, obtain with original signal with the anti-phase cosine signal COS_INV of amplitude, export voltage comparator OPA3 to, compare processing with reference voltage Vref, the magnitude of voltage of reference voltage Vref is that half of output signal maximum amplitude (is Vref=U
m/ 2), obtain digital signal B, export latch L2 to; Cosine differential signal is attached to operational amplifier OPA4, carry out 1: 1 differential amplification in the same way, obtain and the cosine signal COS of original signal with amplitude homophase, export voltage comparator OPA5 and reference voltage Vref to and compare processing, obtain digital signal C, export latch L3 to;
Latch L1, L2 in logic controller and L3 be at same clock input signal trailing edge, and the digital input signal ABC maintenance of sampling, exports sampled result to logic processing module in logic controller; Logic processing module is carried out logic estimation & disposing to sampled signal, exports the square-wave signal UVW that reflects rotor-position, differs 120 °, as the position signalling of three phase electric machine rotor, as driving and the SERVO CONTROL of brushless electric machine.
The present invention adopt above technical scheme can obtain corresponding with rotor-position, mutually differ the three-phase square wave signal of 120 °, compare with Hall element, it has good stability, the advantage that is difficult for being disturbed.
Accompanying drawing explanation
Fig. 1: theory diagram of the present invention.
Fig. 2: signal condition module output signal oscillogram.
Fig. 3: logic controller signal processing algorithm flow chart.
Fig. 4: logic controller signal processing signal output waveform figure.
Embodiment
Below in conjunction with accompanying drawing and example, the invention will be further described, and scheme described herein is only used to provide a further understanding of the present invention, is the application's a part, does not form the restriction to the present invention program.
Logic controller in Fig. 1 adopts the field programmable device (FPGA) of altera corp, and model is EP3C16F484I7;
Resolver adopts the brushless resolver TS2620N21E11 of TAMAGAWA company.
It is sequential benchmark that shift register in logic controller be take the clock that clock generator produces, carry out cyclic shift, produce the SPWM signal of 8kHz, export drive circuit to and carry out current drives, signal after driving exports the excitation input of resolver to, resolver under above-mentioned pumping signal effect, produce reflection rotor-position just, cosine differential signal, export signal condition module to.
In signal condition module, utilize that comparator and amplifier align, cosine differential signal carries out signal condition, obtain digital signal ABC, export the latch in logic controller to.As shown in Figure 2, wherein, A phase signals is that duty ratio is 50% square-wave signal to the waveform of digital signal ABC, and the duty ratio of B phase and C phase signals changes with the difference of rotor-position.
Latch in logic controller is when SPWM signal phase is 90 °, to the digital signal ABC maintenance of sampling, in Fig. 2, position shown in dotted line is latch sampling instant (SPWM signal phase is the moment of 90 °), then logic controller carries out logical process by flow chart shown in Fig. 3 to sampled signal, can obtain corresponding with rotor-position, mutually differ the three-phase square wave signal UVW of 120 °, as the position signalling of three phase electric machine rotor, signal output waveform as shown in Figure 4.
Claims (1)
1. the three phase electric machine rotor position detection circuit based on resolver, is characterized in that, contains: clock generator, logic controller, drive circuit, resolver and signal condition module, wherein:
Described logic controller comprises shift register, logic processing module and latch L1, L2 and L3, shift register in clock generator and described logic controller is connected, shift register be take clock signal that clock generator produces and is carried out cyclic shift as sequential benchmark, output two paths of signals, one road signal is SPWM (the Sine Pulse Width Modulated of excitation resolver, sinusoidal pulse width modulation) signal, be connected to drive circuit and carry out current drives, another road signal is for latching triggering signal, when being 90 °, SPWM signal phase produces a trailing edge, be attached to latch L1 in described logic controller, the clock pulse input terminal of L2 and L3,
Drive circuit carries out current drives to the SPWM signal of described logic controller output, and the signal after driving, as resolver pumping signal, exports the excitation input of resolver to;
Resolver under above-mentioned pumping signal effect, output reflection rotor-position and have orthogonality relation just, cosine differential signal: U
sin=U
msin (ω t) sin (θ) and U
cos=U
msin (ω t) cos (θ), wherein U
mfor the maximum amplitude of output signal, the angular frequency that ω is pumping signal, θ is rotor position angle, above-mentioned just, cosine differential signal exports described signal condition module to;
Described signal condition module is nursed one's health the orthogonal simulation signal of resolver output: sinusoidal differential signal is attached to voltage comparator OPA1, compares processing, obtains digital signal A, exports latch L1 to; Cosine differential signal is attached to operational amplifier OPA2, carrying out 1: 1 backward difference amplifies, obtain with original signal with the anti-phase cosine signal COS_INV of amplitude, export voltage comparator OPA3 to, compare processing with reference voltage Vref, the magnitude of voltage of reference voltage Vref is that half of output signal maximum amplitude (is Vref=U
m/ 2), obtain digital signal B, export latch L2 to; Cosine differential signal is attached to operational amplifier OPA4, carry out 1: 1 differential amplification in the same way, obtain and the cosine signal COS of original signal with amplitude homophase, export voltage comparator OPA5 and reference voltage Vref to and compare processing, obtain digital signal C, export latch L3 to;
Latch L1, L2 in described logic controller and L3 be at same clock input signal trailing edge, and the digital input signal ABC maintenance of sampling, exports sampled result to logic processing module in described logic controller; Logic processing module is carried out logic estimation & disposing to sampled signal: when input signal ABC meets A==0 & & B==0 & & C==0, make B=1, C=1, and get U=A, V=B, W=C; When input signal ABC does not meet above-mentioned condition, directly get U=A, V=B, W=C, the output signal U VW of above-mentioned logic processing module is the square-wave signal that reflects rotor-position, differs 120 °, can be used as the position signalling of three phase electric machine rotor, as driving and the SERVO CONTROL of brushless electric machine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210090562.0A CN102629845B (en) | 2012-03-30 | 2012-03-30 | Position detection circuit of three-phase motor rotor based on rotary transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210090562.0A CN102629845B (en) | 2012-03-30 | 2012-03-30 | Position detection circuit of three-phase motor rotor based on rotary transformer |
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| CN102629845A CN102629845A (en) | 2012-08-08 |
| CN102629845B true CN102629845B (en) | 2014-09-24 |
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| CN201210090562.0A Active CN102629845B (en) | 2012-03-30 | 2012-03-30 | Position detection circuit of three-phase motor rotor based on rotary transformer |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078571A (en) * | 2013-01-04 | 2013-05-01 | 天津清源电动车辆有限责任公司 | Rotary transformer system and control method thereof |
| CN104796053B (en) * | 2015-05-11 | 2017-06-16 | 哈尔滨工业大学 | DC motor controller and control method based on rotary transformer |
| CN105141212B (en) * | 2015-10-12 | 2017-07-28 | 中国汽车工程研究院股份有限公司 | A kind of permagnetic synchronous motor position signalling redundant detecting method and system |
| CN105301401A (en) * | 2015-11-11 | 2016-02-03 | 深圳市大地和电气股份有限公司 | High-power rotary transformer signal acquisition circuit |
| US10408643B2 (en) * | 2016-08-18 | 2019-09-10 | Texas Instruments Incorporated | Methods and apparatus to increase resolver-to-digital converter accuracy |
| CN106357172A (en) * | 2016-08-29 | 2017-01-25 | 西安秦川数控系统工程有限公司 | Sine-cosine signal processing circuit for speed and positon feedback |
| CN110620527B (en) * | 2019-09-27 | 2021-06-22 | 清华大学 | Large-rotation-angle limit position detection circuit based on rotary transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4011440A (en) * | 1975-04-29 | 1977-03-08 | General Electric Company | System for generating an angular rate signal from an angular position signal utilizing a constant amplitude-variable carrier phase signal |
| US4247810A (en) * | 1979-07-05 | 1981-01-27 | Sperry Corporation | Angle to bipolar analog converter |
| CN1017925B (en) * | 1989-01-25 | 1992-08-19 | 林文 | Method and device for travel measurement by capacitance |
| CN101521480B (en) * | 2008-11-21 | 2010-10-13 | 西北工业大学 | Resolution method and resolver for signals of rotating transformer |
| CN101968367A (en) * | 2010-04-19 | 2011-02-09 | 哈尔滨工程大学 | Multifunctional networking digital shaft angle converter and converting method thereof |
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Effective date of registration: 20200731 Address after: Room 107, 1 / F, building 2-8, yanggongzhuang 1, Changxindian, Fengtai District, Beijing 100072 Patentee after: Beijing Chengzhi Jiyuan Technology Co.,Ltd. Address before: 100084 Beijing box office,,, Tsinghua University Patentee before: TSINGHUA University |
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