CN205958597U - It influences little reluctance type locomotive speed sensor degenerated by magnetism and install clearance - Google Patents
It influences little reluctance type locomotive speed sensor degenerated by magnetism and install clearance Download PDFInfo
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- CN205958597U CN205958597U CN201620793162.XU CN201620793162U CN205958597U CN 205958597 U CN205958597 U CN 205958597U CN 201620793162 U CN201620793162 U CN 201620793162U CN 205958597 U CN205958597 U CN 205958597U
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Abstract
The utility model discloses an it influences little reluctance type locomotive speed sensor degenerated by magnetism and install clearance, including testing the speed gear, stainless steel shell, detecting coil, cable, socket, iron core, permanent magnet and detection circuit, the detection circuit includes low pass filter circuit and automatic gain control circuit with detecting coil signal connection. Through with iron core, permanent magnet and detection circuit arrangement in stainless steel shell to greatly, can realize the operating circuit and work in the space of conductively -closed in order to prevent effectively that the space electric field coupling from producing electromagnetic interference's effect outside connecing through the shielded wire, adopt the low pass filter circuit can eliminate the high frequency interference that the sensor probe front end probably received, utilize automatic gain control circuit automatic adjustment gain, guarantee that the output signal amplitude is invariable, can lengthen the sensor live time of this pattern, reduced and test the speed installation clearance requirement between the gear, improved the stability and the reliability of sensor.
Description
Technical field
This utility model is related to electric locomotive and controls sensor field, is degenerated by magnetic and installation gap shadow particularly to a kind of
The little reluctance type locomotive speed sensor of sound.
Background technology
Magnetic resistance speed sensor is a kind of sensor of non-contact detecting rotating speed that electric locomotive is commonly used, including detection line
Circle and permanent magnet, coil and Magnet transfixion, measure speed gearses are installed on motor shaft end, measure speed gearses phase in rotation process
Actionless Magnet is had to the concavo-convex change of gear and between cog, this change causes magnetic circuit reluctance to change, thus changing magnetic circuit
Magnetic flux, is obtained the field signal of change, and field signal is transformed to the signal of telecommunication by detection coil sensing, and it does not need to assist
Power supply, just can be converted into tach signal to be easy to the signal of telecommunication of measurement by electromagnetic induction principle, have compact conformation, response
Hurry up, the strong advantage of stain resistance.
But, because it adopts permanent magnet as magnetic source, work in locomotive high temperature, the environment of vibration, over time
Passage, permanent magnet arises that demagnetization phenomenon, and demagnetizing once occurs in permanent magnet, traditional magnetic resistance speed sensor output signal
Amplitude will reduce, the normal use of impact sensor；In addition, the speed probe of this kind of pattern needs to join with rotating speed gear
Close, the impact to sensor output signal amplitude for the gap between the probe of sensor and rotating speed gear is larger, is filled by different
Join factor impact, there is the different possibility in gap during scheduling and planning and when actually used, so make sensor application in machine
During car environment, difference in output signal.In order to ensure the stability that sensor works long hours, solve possible assembling factor
Impact to sensor, the diamagnetic degeneration of this kind of pattern sensor and affected little ability and need to further enhance by installing gap.
Utility model content
In order to overcome the deficiencies in the prior art, this utility model offer is a kind of to be affected little magnetic by magnetic degeneration and installation gap
Resistive locomotive speed sensor.
For this reason, the utility model discloses a kind of affected little reluctance type locomotive rotating speed and passed by magnetic degeneration and installation gap
Sensor, is installed on locomotive engine axle head, for measuring rotating speed, including measure speed gearses, Stainless Steel Shell, detection coil, cable, inserts
Seat, iron core, permanent magnet and detection process circuit.
Measure speed gearses are connected with motor shaft end.
Stainless Steel Shell is connected with electric machine stand by the bolt that is connected, and periphery bulk shielding.
Detection coil is wound on around iron core, and is installed between permanent magnet and measure speed gearses.
Detection process circuit is connected with detection coil signal.
One end of cable is connected to the outfan of detection process circuit, and the other end connects extraneous motor speed letter by socket
Number port.
Described iron core, permanent magnet and detection process circuit are in described stainless steel case body.
Preferably, described cable adopts the shielding line in shielded cable, and described cable to be connected with described Stainless Steel Shell.
Further, described detection process circuit include the low-pass filter circuit being connected with described detection coil signal and from
Dynamic gain control electricity.
Further, described low-pass filter circuit is made up of resistance R1 and electric capacity C2, and one end of described electric capacity C2 is located at low
Bandpass filter circuit and the junction of automatic gain control circuit, the other end is grounded.
Further, described automatic gain control circuit includes automatic growth control integrated chip, rectification unit, gain tune
Whole unit and amplifier unit；It is defeated that described automatic growth control integrated chip includes No. 1st filter circuit pin, the 1st tunnel rectification
Enter pin, the 1st road adjustable gain input pin, grounding leg, the 1st road reversed input pin, the 1st tunnel resistance adjustment pin, the 1st tunnel
Output pin, the 1st tunnel distortion adjustment pin the 2nd tunnel distortion adjustment pin, the 2nd road output pin, the 2nd tunnel resistance adjustment pin,
2nd road reversed input pin, power pins, the 2nd road adjustable gain input pin, the 2nd tunnel rectification input pin and the filtering of the 2nd tunnel
Circuit pin；Described grounding leg ground connection, described power pins connect power supply, described No. 1st filter circuit pin, the 2nd tunnel filtered electrical
Pass foot and the 1st tunnel rectification input pin are connected with electric capacity C3, resistance R8 and electric capacity C5 respectively, constitute rectifier control circuit；Whole
It is provided with the internal resistance R3 of automatic growth control integrated chip between stream unit and electric capacity C3；Described 1st road adjustable gain input
Pin and the 2nd road adjustable gain input pin, the 1st road reversed input pin and the 2nd road reversed input pin connect electric capacity C7, electricity
Hold C4, electric capacity C6 and resistance R4, resistance R5, resistance R6, constitute adjustable gain control circuit；Amplifier unit passes through the 1st road electricity
Resistance adjustment pin, the 2nd tunnel resistance adjustment pin are connected with electric capacity C2；Resistance R2, resistance R7 constitute the biasing of amplifier unit
Circuit.
Compared with prior art, this utility model has the advantages that：
1. by being arranged on iron core, permanent magnet and detection process circuit in stainless steel case body, and connect outer by shielding line
Greatly, achievable operating circuit works effectively to prevent space electric field coupling from producing the effect of electromagnetic interference in the space being shielded
Really；
2. the High-frequency Interference that sensor probe front end may be subject to can be eliminated using low-pass filter circuit；
3. the moment electric on a sensor, using automatic gain control circuit processing detection coil electromagnetism induced signal, from
One gain of dynamic setting, output signal keeps constant amplitude under this gain；For sensor during scheduling and planning and the tooth that tests the speed
Wheel is installed gap and sensor signal output performance inconsistent with installation gap during normal operation of sensor may be led to differ
The problem causing, also with the electromagnetic induction signal of automatic gain control circuit processing detection coil, on a sensor electricity when
Carve, adjust automatically gain it is ensured that output signal constant amplitude, can extend the sensor use time of this pattern, reduce and survey
Installation clearance requirement between fast gear, improves stability and the reliability of sensor.
Brief description
Fig. 1 is overall structure diagram of the present utility model；
Fig. 2 is the structured flowchart of detection process circuit in this utility model；
Fig. 3 is the pinoutss of automatic growth control integrated chip in this utility model；
Fig. 4 is circuit theory diagrams of the present utility model.
Specific embodiment
Below in conjunction with the accompanying drawings embodiment of the present utility model is described in detail.
Refer to Fig. 1, this utility model offer is a kind of to be affected little reluctance type locomotive rotating speed by magnetic degeneration and installation gap
Sensor, is installed on locomotive engine axle head, for measure rotating speed it is characterised in that include measure speed gearses 1, Stainless Steel Shell 2,
Detection coil 3, cable 4, socket 5, iron core 6, permanent magnet 7 and detection process circuit 8.
Measure speed gearses 1 are connected with motor shaft end, in order to transmit motor speed.
Stainless Steel Shell 2 is connected with electric machine stand by the bolt that is connected, and periphery bulk shielding.
Detection coil 3 is wound on around iron core 6, and is installed between permanent magnet 7 and measure speed gearses 1；Measure speed gearses 1 rotated
There is the concavo-convex change of gear and between cog with respect to actionless Magnet, this change causes magnetic circuit reluctance to change, thus changing in journey
Become magnetic circuit magnetic flux, the field signal obtaining change is sensed by detection coil 3, and field signal is transformed to the signal of telecommunication.
Detection process circuit 8 is connected with detection coil 3 signal.
One end of cable 4 is connected to the outfan of detection process circuit 8, and the other end connects extraneous motor by socket 5 and turns
Fast signal port.
Described iron core 6, permanent magnet 7 and detection process circuit 8 are in described Stainless Steel Shell 2.
Described cable 4 adopts the shielding line in shielded cable, and described cable 4 to be connected with described Stainless Steel Shell 2.
Refer to Fig. 2, described detection process circuit 8 includes the low-pass filter circuit being connected with described detection coil 3 signal
10 and automatic gain control circuit 11.
Refer to Fig. 2 and combine Fig. 4, described low-pass filter circuit 10 is made up of resistance R1 and electric capacity C2, described electric capacity C2's
One end is grounded located at the junction of low-pass filter circuit 10 and automatic gain control circuit 11, the other end.
Refer to Fig. 2 to Fig. 4, described automatic gain control circuit 11 includes automatic growth control integrated chip 9, rectification list
Unit 28, gain adjusting unit 29 and amplifier unit 30；Described automatic growth control integrated chip 9 includes No. 1st filter circuit
Pin 12, the 1st tunnel rectification input pin 13, the 1st road adjustable gain input pin 14, grounding leg 15, the 1st road reversed input pin
16th, the 1st tunnel resistance adjustment pin 17, the 1st road output pin 18, the 1st tunnel distortion adjustment pin 19, the 2nd tunnel distortion adjustment pin
20th, the 2nd road output pin 21, the 2nd tunnel resistance adjustment pin 22, the 2nd road reversed input pin 23, power pins 24, the 2nd tunnel can
Adjust gain input pin 25, the 2nd tunnel rectification input pin 26 and No. 2nd filter circuit pin 27；Described grounding leg 15 is grounded, institute
State power pins 24 and connect power supply, described No. 1st filter circuit pin 12, No. 2nd filter circuit pin 27 and the 1st tunnel rectification input
Pin 13 is connected with electric capacity C3, resistance R8 and electric capacity C5 respectively, constitutes rectifier control circuit；Between rectification unit 28 and electric capacity C3
It is provided with the internal resistance R3 of automatic growth control integrated chip 9；Described 1st road adjustable gain input pin 14 and the 2nd tunnel are adjustable
Gain input pin 25, the 1st road reversed input pin 16 and the 2nd road reversed input pin 23 connect electric capacity C7, electric capacity C4, electric capacity
C6 and resistance R4, resistance R5, resistance R6, constitute adjustable gain control circuit, obtain amplitude result, inverse proportion according to rectification circuit
Ground adjust gain size, controls the output of amplifier unit 30, makes the amplitude remaining constant of the output signal of circuit；Amplifier list
Unit 30 passes through the 1st tunnel resistance adjustment pin 17, the 2nd tunnel resistance adjustment pin 22 is connected with electric capacity C2, and automatic growth control is integrated
Chip 9 provides the reference voltage of+1.8V for amplifier unit 30；Resistance R2, resistance R7 constitute the inclined of amplifier unit 30
Circuits.
The induced signal of detection coil signal of output after testing circuit process is maintained at
Wherein, VOUTIt is the output of signal, VINIt is the input of detection signal,
IB=140mA, VIN(amp is the amplitude of input signal.
Above-mentioned formula shows, the gain using circuit after automatic growth control integrated chip 9 is according to input signal amplitude
Realize inverse ratio change.After this type speed probe is in application a period of time, wherein demagnetization phenomenon in permanent magnet 7, leads to
When decay in the signal of detection coil 3 sensing, in the moment of electricity on a sensor, process inspection using automatic gain control circuit 11
Test coil 3 electromagnetic induction signal, automatically sets a gain, and output signal keeps constant amplitude under this gain；For life
When producing debugging, sensor and measure speed gearses 1 are installed gap and may inconsistent with installation gap during normal operation of sensor be led to
The inconsistent problem of sensor signal output performance, also with the electromagnetism of automatic gain control circuit 11 processing detection coil 3
Induced signal, the moment of electricity on a sensor, adjust automatically gain it is ensured that output signal constant amplitude, eliminate sensor with
The impact in gap is installed between measure speed gearses.
To sum up, this utility model is by being arranged on iron core, permanent magnet and detection process circuit in stainless steel case body, and leads to
Cross shielding line connect outer bigly, achievable operating circuit work in the space being shielded with effectively prevent space electric field coupling produce
The effect of electromagnetic interference；The High-frequency Interference that sensor probe front end may be subject to can be eliminated using low-pass filter circuit；Using
Automatic gain control circuit adjust automatically gain it is ensured that output signal constant amplitude, when can extend the sensor of this pattern and using
Between, reduce the installation clearance requirement and measure speed gearses between, improve stability and the reliability of sensor.
The above, only this utility model preferably specific embodiment, but protection domain of the present utility model is not
Be confined to this, any those familiar with the art in the technical scope that this utility model discloses, according to this practicality
New technical scheme and its utility model design in addition equivalent or change, all should cover in protection model of the present utility model
Within enclosing.
Claims (5)
1. a kind of by magnetic degenerate and install gap affected little reluctance type locomotive speed sensor, be installed on locomotive engine axle head,
For measuring rotating speed it is characterised in that including measure speed gearses (1), Stainless Steel Shell (2), detection coil (3), cable (4), inserting
Seat (5), iron core (6), permanent magnet (7) and detection process circuit (8), wherein：
Measure speed gearses (1) are connected with motor shaft end；
Stainless Steel Shell (2) is connected with electric machine stand by the bolt that is connected, and periphery bulk shielding；
Detection coil (3) is wound on around iron core (6), and is installed between permanent magnet (7) and measure speed gearses (1)；
Detection process circuit (8) is connected with detection coil (3) signal；
One end of cable (4) is connected to the outfan of detection process circuit (8), and the other end passes through socket (5) and connects extraneous motor
Tach signal port；
Described iron core (6), permanent magnet (7) and detection process circuit (8) are in described Stainless Steel Shell (2).
2. according to claim 1 a kind of by magnetic degenerate and install gap affected little reluctance type locomotive speed sensor,
It is characterized in that, described cable (4) adopts shielding line and described Stainless Steel Shell (2) in shielded cable, and described cable (4)
It is connected.
3. according to claim 1 a kind of by magnetic degenerate and install gap affected little reluctance type locomotive speed sensor,
It is characterized in that, described detection process circuit (8) includes the low-pass filter circuit (10) being connected with described detection coil (3) signal
With automatic gain control circuit (11).
4. according to claim 3 a kind of by magnetic degenerate and install gap affected little reluctance type locomotive speed sensor,
It is characterized in that, described low-pass filter circuit (10) is made up of resistance R1 and electric capacity C2, and one end of described electric capacity C2 is located at low pass
Filter circuit (10) and the junction of automatic gain control circuit (11), the other end is grounded.
5. according to claim 4 a kind of by magnetic degenerate and install gap affected little reluctance type locomotive speed sensor,
It is characterized in that, described automatic gain control circuit (11) include automatic growth control integrated chip (9), rectification unit (28),
Gain adjusting unit (29) and amplifier unit (30)；Described automatic growth control integrated chip (9) includes No. 1st filter circuit
Pin (12), the 1st tunnel rectification input pin (13), the 1st road adjustable gain input pin (14), grounding leg (15), the 1st tunnel are anti-phase
Input pin (16), the 1st tunnel resistance adjustment pin (17), the 1st road output pin (18), the 1st tunnel distortion adjustment pin (19),
2 tunnel distortions adjustment pin (20), the 2nd road output pin (21), the 2nd tunnel resistance adjustment pin (22), the 2nd road reversed input pin
(23), power pins (24), the 2nd road adjustable gain input pin (25), the 2nd tunnel rectification input pin (26) and the filtering of the 2nd tunnel
Circuit pin (27)；Described grounding leg (15) ground connection, described power pins (24) connect power supply, described No. 1st filter circuit pin
(12), No. 2nd filter circuit pin (27) and the 1st tunnel rectification input pin (13) respectively with electric capacity C3, resistance R8 and electric capacity C5
Connect, constitute rectifier control circuit；It is provided with the interior of automatic growth control integrated chip (9) between rectification unit (28) and electric capacity C3
Portion resistance R3；Described 1st road adjustable gain input pin (14) and the 2nd road adjustable gain input pin (25), the 1st tunnel are anti-phase defeated
Enter pin (16) and the 2nd road reversed input pin (23) connects electric capacity C7, electric capacity C4, electric capacity C6 and resistance R4, resistance R5, resistance
R6, constitutes adjustable gain control circuit；Amplifier unit (30) passes through the 1st tunnel resistance adjustment pin (17), the 2nd tunnel resistance adjustment
Pin (22) is connected with electric capacity C2；Resistance R2, resistance R7 constitute the biasing circuit of amplifier unit (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620793162.XU CN205958597U (en) | 2016-07-27 | 2016-07-27 | It influences little reluctance type locomotive speed sensor degenerated by magnetism and install clearance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620793162.XU CN205958597U (en) | 2016-07-27 | 2016-07-27 | It influences little reluctance type locomotive speed sensor degenerated by magnetism and install clearance |
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| CN205958597U true CN205958597U (en) | 2017-02-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030853A (en) * | 2018-08-01 | 2018-12-18 | 长沙七维传感技术有限公司 | A kind of vehicle-wheel speed sensor |
| CN112630689A (en) * | 2020-11-30 | 2021-04-09 | 杭州和利时自动化有限公司 | Broken wire diagnosis device and related assembly |
| CN115060924A (en) * | 2022-08-18 | 2022-09-16 | 四川新川航空仪器有限责任公司 | Magnetic shielding-based rotation speed sensor |
-
2016
- 2016-07-27 CN CN201620793162.XU patent/CN205958597U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030853A (en) * | 2018-08-01 | 2018-12-18 | 长沙七维传感技术有限公司 | A kind of vehicle-wheel speed sensor |
| CN112630689A (en) * | 2020-11-30 | 2021-04-09 | 杭州和利时自动化有限公司 | Broken wire diagnosis device and related assembly |
| CN112630689B (en) * | 2020-11-30 | 2024-04-05 | 杭州和利时自动化有限公司 | Broken line diagnosis device and related assembly |
| CN115060924A (en) * | 2022-08-18 | 2022-09-16 | 四川新川航空仪器有限责任公司 | Magnetic shielding-based rotation speed sensor |
| CN115060924B (en) * | 2022-08-18 | 2022-11-11 | 四川新川航空仪器有限责任公司 | Magnetic shielding-based rotation speed sensor |
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