CN220103982U - Displacement detection and signal conditioning circuit for inductive magnetic suspension bearing - Google Patents
Displacement detection and signal conditioning circuit for inductive magnetic suspension bearing Download PDFInfo
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- CN220103982U CN220103982U CN202321678094.9U CN202321678094U CN220103982U CN 220103982 U CN220103982 U CN 220103982U CN 202321678094 U CN202321678094 U CN 202321678094U CN 220103982 U CN220103982 U CN 220103982U
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 43
- 238000001514 detection method Methods 0.000 title claims abstract description 34
- 239000000725 suspension Substances 0.000 title claims abstract description 17
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 15
- 230000001939 inductive effect Effects 0.000 title claims abstract description 10
- 230000005284 excitation Effects 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The utility model relates to a displacement detection and signal conditioning circuit for an inductive magnetic suspension bearing, which is characterized in that square waves generated by a timer are shaped into excitation signals, electric signals proportional to displacement are generated through a detection circuit, a filter circuit and a subtracting circuit, and the displacement direction and the displacement size of a rotor are obtained through comparison of output voltage and bias voltage through a bias amplitude modulation circuit. The circuit has a simple structure, and solves the defects of high cost and limited use environment; the magnetic suspension bearing displacement detection device has high detection precision, meets the magnetic suspension bearing displacement detection requirement, can process a rotor displacement signal when the sensor is used, converts displacement change into electric quantity change, provides a basis for magnetic suspension bearing control, is convenient for carrying out displacement control on a magnetic suspension rotor, and has strong practicability and wide applicability.
Description
Technical Field
The utility model relates to a displacement detection and signal conditioning circuit, in particular to a displacement detection and signal conditioning circuit for an inductive magnetic suspension bearing.
Background
Currently, in many displacement detection fields, a high-frequency sine wave needs to be used as a driving signal, and the first method is that the high-frequency sine wave is generated through a digital frequency synthesizer DDS, but the DDS is relatively expensive; the second is through signal generator such as MAX038, ICL8038, but at present is in the state of stopping production mostly, and the working temperature is 0-70 degrees centigrade, can't use under the high temperature condition;
for the signal processing part, if a special signal conditioning chip is used, the cost is often high, and when the cut-off frequency of a signal processing circuit is low, the requirement of a high-speed magnetic bearing may not be met.
Therefore, it is necessary to provide a displacement detection and signal conditioning circuit for an inductive magnetic bearing.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model aims to provide a displacement detection and signal conditioning circuit for an inductive magnetic suspension bearing.
In order to achieve the above object, the present utility model adopts the following technical scheme:
a displacement detection and signal conditioning circuit for inductive magnetic suspension bearing comprises an excitation circuit, a detection circuit, a filter circuit, a subtraction circuit and a bias amplitude modulation circuit,
the output end of the exciting circuit is connected with the input end of the detection circuit, the output end of the detection circuit is connected with the input ends of the filter circuit and the subtracting circuit, and the output ends of the filter circuit and the subtracting circuit are connected with the input ends of the bias amplitude modulation circuit;
the exciting circuit is used for generating a sine exciting signal, a pair of differential signals are generated through the detecting circuit, an electric signal proportional to displacement is generated through the filtering circuit and the subtracting circuit, and finally the displacement direction and the displacement size of the rotor are obtained through comparing the output voltage with the bias voltage through the bias amplitude modulation circuit.
The exciting circuit comprises a fourth-order Butterworth filter with an input end connected with a timer;
the timer is used to generate a 20KHz square wave signal,
the fourth-order Butterworth filter is used for filtering out harmonic waves and clutter of square wave signals for more than three times to obtain sine waves with fixed frequency, and the sine waves are sine excitation signals.
Further, the square wave signal and the sine wave have a frequency of 20KHz.
Further, the sine excitation signal is generated after a sine wave passes through a power amplification link.
The bias amplitude modulation circuit: the ADC voltage range of the DSP is 0-3.3V, and the bias voltage is set to be 1.65V.
The utility model has the advantages that:
the utility model relates to a displacement signal processing circuit for an inductive magnetic bearing, which is characterized in that square waves generated by a timer are shaped into excitation signals, an electric signal proportional to displacement is generated through a detection circuit, a filter circuit and a subtracting circuit, and the displacement direction and the displacement size of a rotor are obtained through comparing an output voltage with a bias voltage through a bias amplitude modulation circuit. The circuit has a simple structure, and solves the defects of high cost and limited use environment; the magnetic suspension bearing displacement detection device has high detection precision, meets the magnetic suspension bearing displacement detection requirement, can process a rotor displacement signal when the sensor is used, converts displacement change into electric quantity change, provides a basis for magnetic suspension bearing control, is convenient for carrying out displacement control on a magnetic suspension rotor, and has strong practicability and wide applicability.
Drawings
FIG. 1 is a fourth order Butterworth filter and power amplifier circuit;
FIG. 2 shows a detection section;
FIG. 3 is a filter circuit and a subtracting circuit;
fig. 4 is a bias amplitude modulation circuit.
Detailed Description
The utility model is described in detail below with reference to the drawings and the specific embodiments.
A displacement detection and signal conditioning circuit for an inductive magnetic suspension bearing consists of an excitation circuit, a detection circuit, a filter circuit, a subtraction circuit and a bias amplitude modulation circuit.
The exciting circuit consists of a timer and a fourth-order Butterworth filter, the timer is connected with the input end of the fourth-order Butterworth filter, the output end of the fourth-order Butterworth filter is connected with the input end of the detection circuit, the output end of the detection circuit is connected with the input ends of the filter circuit and the subtracting circuit, and the output ends of the filter circuit and the subtracting circuit are connected with the input end of the bias amplitude modulation circuit.
Principle of:
by means of a timer, a square wave of 20KHz is generated, which can be decomposed into a series of superimposed odd harmonics of the fundamental frequency, the amplitudes of which are 2/PI,2/3PI,2/5PI.
The four-order Butterworth filter shown in figure 1 is adopted to filter out harmonic waves and clutter for more than three times to obtain a sine wave with the fixed frequency of 20KHz, and the sine wave passes through a power amplifier circuit to generate a sine excitation signal meeting the requirement.
As shown in fig. 2, a sinusoidal excitation signal is applied across the sensor coil, and a pair of differential signals are generated by a detection circuit.
An electrical signal proportional to the displacement is generated by passing through a filter circuit and a subtracting circuit as shown in fig. 3.
In the control of the magnetic suspension bearing, not only the displacement is required to be known, but also the displacement direction is required to be known, so that a bias amplitude modulation circuit shown in fig. 4 is applied, the ADC acquisition voltage range of the DSP is 0-3.3V, the bias voltage is set to be 1.65V, and the displacement direction and the displacement size of the rotor are obtained by comparing the output voltage with the bias voltage.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the utility model in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the utility model.
Claims (5)
1. A displacement detection and signal conditioning circuit for an inductive magnetic suspension bearing is characterized by comprising an excitation circuit, a detection circuit, a filter circuit, a subtraction circuit and a bias amplitude modulation circuit,
the output end of the exciting circuit is connected with the input end of the detection circuit, the output end of the detection circuit is connected with the input ends of the filter circuit and the subtracting circuit, and the output ends of the filter circuit and the subtracting circuit are connected with the input ends of the bias amplitude modulation circuit;
the exciting circuit is used for generating a sine exciting signal, a pair of differential signals are generated through the detecting circuit, an electric signal proportional to displacement is generated through the filtering circuit and the subtracting circuit, and finally the displacement direction and the displacement size of the rotor are obtained through comparing the output voltage with the bias voltage through the bias amplitude modulation circuit.
2. The displacement detection and signal conditioning circuit of claim 1, wherein the excitation circuit comprises a fourth order butterworth filter with an input terminal connected to a timer;
the timer is used to generate a 20KHz square wave signal,
the fourth-order Butterworth filter is used for filtering out harmonic waves and clutter of square wave signals for more than three times to obtain sine waves with fixed frequency, and the sine waves are sine excitation signals.
3. The displacement detection and signal conditioning circuit of claim 2, wherein the square wave signal and sine wave have a frequency of 20KHz.
4. The displacement detection and signal conditioning circuit according to claim 2, wherein the sinusoidal excitation signal is generated by a power amplification step.
5. The displacement detection and signal conditioning circuit of claim 1, wherein the bias amplitude modulation circuit: the ADC voltage range of the DSP is 0-3.3V, and the bias voltage is set to be 1.65V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321678094.9U CN220103982U (en) | 2023-06-29 | 2023-06-29 | Displacement detection and signal conditioning circuit for inductive magnetic suspension bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321678094.9U CN220103982U (en) | 2023-06-29 | 2023-06-29 | Displacement detection and signal conditioning circuit for inductive magnetic suspension bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220103982U true CN220103982U (en) | 2023-11-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321678094.9U Active CN220103982U (en) | 2023-06-29 | 2023-06-29 | Displacement detection and signal conditioning circuit for inductive magnetic suspension bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220103982U (en) |
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2023
- 2023-06-29 CN CN202321678094.9U patent/CN220103982U/en active Active
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