CN106849952A - A kind of magnetic suspension bearing displacement signal nurses one's health system and method certainly - Google Patents

Abstract

System and method, including reference voltage input circuit, original displacement signal input circuit, voltage amplifier circuit, filter circuit, clamp circuit and DSP module are nursed one's health the present invention relates to a kind of magnetic suspension bearing displacement signal certainly；External reference voltage REF is input to by voltage amplifier circuit by reference to voltage input circuit, by original displacement signal input circuit by the original displacement signal V of magnetic suspension bearing_SIt is input to voltage amplifier circuit, two-way input signal is sued for peace and amplified by voltage amplifier circuit, again by the signal input after computing to filter circuit, signal is input to filter circuit the AD of DSP module by clamp circuit, input signal comprising displacement information is converted into digital quantity by AD, and then digital quantity is adjusted method and obtains desired displacement signal by DSP by self-regulated.The present invention not only saves the complicated processes of conditioning magnetic suspension bearing displacement signal manually, and the signal that human error is brought when effectively weakening error and the manual conditioning because of amplifying circuit resistance is inaccurate.

Description

A kind of magnetic suspension bearing displacement signal nurses one's health system and method certainly

Technical field

The present invention relates to a kind of magnetic suspension bearing displacement signal from system and method is nursed one's health, for the original to magnetic suspension bearing Beginning displacement signal is nursed one's health automatically, can save the complicated processes that traditional manual nurses one's health magnetic suspension bearing displacement signal, makes magnetic suspension shaft Hold production debugging more efficient.

Background technology

Compared with traditional rolling bearing, sliding bearing and filmatic bearing, magnetic suspension bearing does not exist Mechanical Contact, because This its rotor can run to rotating speed very high, with mechanical wear it is small, energy consumption is low, noise is small, long lifespan, without lubrication, nothing The advantages of oily pollution, it is particularly well-suited in the particular surroundings such as high speed, vacuum, ultra-clean.

Magnetic suspension bearing control when need in real time obtain rotor displacement signal, and the original displacement signal of rotor due to Amplitude Ration is larger, it is impossible to be directly inputted in the AD of control chip DSP, it is therefore desirable to first passes through original displacement signal and once adjusts Reason.General conditioning process is：The limiting value of original displacement signal is first measured, then one voltage amplifier circuit of design makes original When displacement signal is limiting value, the signal that AD is collected is just specific value (desired displacement signal).This Opsonizing method Have the disadvantage：Because the processing of magnetic bearing, installation can not possibly be completely the same, two design identical magnetic suspension bearing limit positions Shifting value is incomplete same, can only be directed to different extreme displacement values and design specific voltage amplifier circuit, original to meet The signal that AD is collected when displacement signal is limiting value is just the requirement of particular value (desired displacement signal), this cumbersome mistake Journey has had a strong impact on magnetic suspension bearing production efficiency.

The content of the invention

Technology solve problem of the invention：General magnetic suspension bearing Opsonizing method is overcome in versatility, cost and precision side The deficiency in face, there is provided a kind of generally applicable, inexpensive, high-precision magnetic suspension bearing displacement signal nurses one's health system and method certainly.

Technical solution of the invention：A kind of magnetic suspension bearing displacement signal, can be to magnetic suspension shaft from conditioning system The original displacement signal for holding is nursed one's health automatically, mainly includes reference voltage input circuit, original displacement signal input circuit, electricity Pressure amplifying circuit, filter circuit, clamp circuit, DSP module.The system is by reference to voltage input circuit that external reference is electric Pressure REF is input to voltage amplifier circuit, by original displacement signal input circuit by the original displacement signal V of magnetic suspension bearing_S Voltage amplifier circuit is input to, two-way input signal is sued for peace and amplified by voltage amplifier circuit, then by the signal input after computing To filter circuit, signal is input to filter circuit the AD of DSP module by clamp circuit, and AD is by the input comprising displacement information Signal is converted into digital quantity, and then digital quantity is adjusted method and obtains desired displacement signal by DSP by self-regulated.

The present invention is from Opsonizing method：First according to limiting value design voltage amplifying circuit (3) of original displacement signal, it is ensured that from The displacement signal one of voltage amplifier circuit output is scheduled in the sample range of AD, the extreme displacement letter that then DSP collects AD Number by self-regulated adjust method obtain desired displacement signal.

Present invention advantage compared with prior art is：Both do not increase extra hardware cost, magnetic axis is realized again Hold the automatic conditioning of displacement signal and precision is also higher than existing Opsonizing method.It has advantages below：(1) hardware circuit Part can be designed to unified parameters, beneficial to volume production；(2) nursed one's health automatically using software, conditioning precision is higher, conditioning process is higher Effect.

Brief description of the drawings

Fig. 1 is structure composition block diagram of the invention；

Fig. 2 is reference voltage input circuit of the invention；

Fig. 3 is original displacement signal input circuit of the invention；

Fig. 4 is voltage amplifier circuit of the invention；

Fig. 5 is filter circuit of the invention；

Fig. 6 is clamp circuit of the invention；

Fig. 7 is that algorithm block diagram is managed in self-regulated of the invention.

Specific embodiment

As shown in figure 1, the invention mainly comprises reference voltage input circuit 1, original displacement signal input circuit 2, voltage Amplifying circuit 3, filter circuit 4, clamp circuit 5, DSP module 6, comprising AD and self-regulated adjustment method 7 wherein in DSP module.This is System is that external reference voltage REF is input into voltage amplifier circuit 3 by reference to voltage input circuit 1；Believed by original displacement Number input circuit 2 is by the original displacement signal V of magnetic suspension rotor_SIt is input to voltage amplifier circuit 3, voltage amplifier circuit 3 is by two Road input signal is sued for peace and is amplified, then by the signal input after computing to filter circuit 4, filter circuit is by signal by clamper electricity Road 5 is input to the AD of DSP module 6, and the input signal comprising displacement information is converted into digital quantity by AD, and AD is collected number by DSP Word amount is adjusted method 7 and obtains desired displacement signal by self-regulated.

As shown in Fig. 2 reference voltage input circuit of the invention is a voltage follower circuit, impedance conversion is primarily served Effect.

As shown in figure 3, original displacement signal input circuit of the invention is a voltage follower circuit, impedance is primarily served The effect of conversion.

As shown in figure 4, voltage amplifier circuit of the invention is a reverse add circuit, output signal and input signal Relation is：Can be realized to raw bits by configuring resistance R1, R and regulation reference voltage REF Shifting signal carries out level deviation and transformation of scale, it is ensured that the displacement signal one after primary conditioning is scheduled in the range of AD collections.

As shown in figure 5, filter circuit of the invention is a second-order low-pass filter circuit, in mainly filtering displacement signal High-frequency noise, make signal more steady.

As shown in fig. 6, clamp circuit of the invention is made up of the resistor coupled in parallel of a 3V voltage-regulator diode and a 7.5K, Clamper mainly is carried out to the signal for entering AD, DSP is played a protective role.

As shown in fig. 7, self-regulated reason algorithm flow of the invention is：To rotor in forward and reverse extreme position correspondence after initialization Desired displacement signal value set, it is assumed that setting value is V₁, V₂；Then control magnetic suspension bearing rotor moves to positive pole Extreme position, it is ensured that rotor one is scheduled on direct limit position；The displacement signal now of AD collections afterwards, is designated as V_O1；Control magnetic suspension Bearing rotor moves to inverse limit position, it is ensured that rotor one is scheduled on inverse limit position；The displacement letter now of AD collections afterwards Number, it is designated as V_O2；Release magnetic bearing rotor, calculating parameterCalculating parameter b=V₁-k·V_O1；During normal work, If original displacement signal is V_S, the displacement signal that AD is collected is V_O, corresponding desired displacement signal is V, then have：V=kV_O+b。

Magnetic suspension bearing displacement signal of the present invention can also be used as the conditioning of common voltage signal from Opsonizing method Method, application person can easily realize the conditioning that different range is exported by changing software flexible to same signal.

Claims (4)

1. a kind of magnetic suspension bearing displacement signal is from conditioning system, it is characterised in that：Including reference voltage input circuit (1), original Beginning displacement signal input circuit (2), voltage amplifier circuit (3), filter circuit (4), clamp circuit (5) and DSP module (6), its In：

Reference voltage input circuit (1)：Connect with voltage amplifier circuit (3), for reference voltage to be given by impedance conversion Voltage amplifier circuit (3)；

Original displacement signal input circuit (2)：Connect with voltage amplifier circuit (3), for by original displacement signal by impedance Voltage amplifier circuit (3) is given in conversion；

Voltage amplifier circuit (3)：External reference voltage and original displacement signal are sued for peace and amplified；Guarantee eventually enters into the letter of AD Number scope is in 0~3V；

Filter circuit (4)：Connect with voltage amplifier circuit (3), the output signal to voltage amplifier circuit is filtered, reduce letter High-frequency noise in number；

Clamp circuit (5)：AD pins with DSP module (6) connect, primarily to ensure to enter the signal voltage of AD 0~ In the range of 3V, DSP module (6) is protected；

DSP module (6)：Connect with filter circuit (4), the signal comprising displacement information that wherein AD parts will collect is transformed to Digital quantity, then DSP by digital quantity by self-regulated adjust method (7) obtain preferable displacement signal；It is real that method (7) is adjusted in the self-regulated It is now：If the positive and negative limiting value of original displacement signal is V_S1And V_S2, by after voltage amplifier circuit (3) and filter circuit (4), The corresponding voltage value that AD is collected is V_O1And V_O2, the desired displacement signal value corresponding to the spacing shifting signal of both positive and negative polarity is V₁And V₂； Because circuit is linear, it is assumed that when original displacement signal is V_SWhen, by after voltage amplifier circuit (3) and filter circuit (4), The corresponding voltage value that AD is collected is V_O, and corresponding desired displacement signal value V=kV_O+ b, then calculate parameter by below equation K and b:

$\left\{\begin{array}{c}k=\frac{V_2-V_1}{V_{O2}-V_{O1}}\\ b=V_1-k\·V_{O1}\end{array}\right..$

2. magnetic suspension bearing displacement signal according to claim 1 is from conditioning system, it is characterised in that：The voltage amplification Circuit (3) is according to formula：To adjust R₁Value, it is ensured that work as V_SEqual to the limiting value of original displacement signal When, it still is able to ensure output voltage V_OIn the sample range of AD.

3. a kind of magnetic suspension bearing displacement signal is from Opsonizing method, it is characterised in that step is as follows：

(1) limiting value Design enlargement circuit (3) first according to original displacement signal, it is ensured that from the displacement letter of amplifying circuit output Number one is scheduled in the sample range of AD；

And then the DSP extreme displacement signals that collect AD are adjusted method and obtain preferable displacement signal by self-regulated (2)；It is described from Conditioning algorithm (7) is embodied as：If the positive and negative limiting value of original displacement signal is V_S1And V_S2, by voltage amplifier circuit (3) and filter After wave circuit (4), the corresponding voltage value that AD is collected is V_O1And V_O2, the desired displacement letter corresponding to the spacing shifting signal of both positive and negative polarity Number value be V₁And V₂；Because circuit is linear, it is assumed that when original displacement signal is V_SWhen, by voltage amplifier circuit (3) and filter After wave circuit (4), the corresponding voltage value that AD is collected is V_O, and corresponding desired displacement signal value V=kV_O+ b, then by following Formula calculates parameter k and b:

$\left\{\begin{array}{c}k=\frac{V_2-V_1}{V_{O2}-V_{O1}}\\ b=V_1-k\·V_{O1}\end{array}\right..$

4. magnetic suspension bearing displacement signal according to claim 3 is from Opsonizing method, it is characterised in that：The voltage amplification Circuit (3) is according to formula：To adjust R₁Value, it is ensured that work as V_SEqual to the limiting value of original displacement signal When, it still is able to ensure output voltage V_OIn the sample range of AD.