CN201637754U - Magnetoelectric velocity transducer - Google Patents

Abstract

The utility model provides a magnetoelectric velocity transducer which is characterized by comprising a shell, a first iron core, a second iron core, a magnetic bar and a coil that are arranged in the shell, and an electrical signal output interface arranged on the shell, wherein the first iron core and the second iron core are fixed in the shell and wound with coils; the magnetic bar is arranged between the first iron core and the second iron core to form a pi-shaped structure; the outer ends of the first iron core and the second iron core extend out of the shell; the magnetic polarity at the outer ends of the first iron core and the second iron core are opposite; and the first iron core and second iron core are electrically connected with the electrical signal output interface. The magnetoelectric velocity transducer has good low-velocity performance and strong output signals.

Description

Magnetoelectric velocity transducer

Technical field

The utility model belongs to sensor field, relates to a kind of magnetoelectric velocity transducer.

Technical background

The angular velocity isolation measurement sensor of usefulness mainly contains infrared sensor (reflective, transmission-type), Hall element, magnetoelectric transducer in the market.Above several sensors according to different environments for use, application is all arranged.But be aimed at rail locomotive, because work under bad environment, the decompressor temperature that oils is up to 120 ℃, and can splash a large amount of machine oil, and photoelectric sensor just can not use in this occasion, and Hall element and magnetoelectric transducer can well be competent at.Hall element needs power supply, and carrying load ability own is little.Magnetoelectric transducer test low-speed performance is not good.And original sensor price is expensive, procurement cycle is long, after-sales service is difficult.And the magnetoelectric transducer that uses on the market, temperature grade is low, and output amplitude is little, a little less than the carrying load ability.

The utility model content

The purpose of this utility model is to propose a kind of magnetoelectric velocity transducer, and this magnetoelectric velocity transducer low-speed performance is good, and output signal is strong.

Technical solution of the present utility model is as follows:

A kind of magnetoelectric velocity transducer comprises shell, first iron core, second iron core, bar magnet, coil in the enclosure is set and is arranged on electrical signal output interface on the shell; First iron core and second iron core are fixing in the enclosure, all are wound with coil on first iron core and second iron core; Bar magnet is arranged between first iron core and second iron core, forms ∏ shape structure; Shell is stretched out in the outer end of first iron core and second iron core, and first iron core is opposite with the magnetic polarity of the outer end of second iron core; First iron core and second iron core all are electrically connected with electrical signal output interface.

Described ∏ shape structure is 3 groups.

Described electrical signal output interface is a cable interface; Realize being electrically connected by connection terminal and lead between cable interface and first iron core and second iron core, the terminal fixed head is fixed in the enclosure, and connection terminal is installed on the terminal fixed head.

First iron core and second iron core are all fixing in the enclosure by set bolt.

Beneficial effect:

The speed that this magnetoelectric velocity transducer can be widely used in various syntonic type locomotives, motor train unit detects, anti-idle running and anti-skidding, is the critical component of traffic safety and control, possesses high reliability and full speed range detectability.

This magnetoelectric velocity transducer does not contain easy inefficacy electronic component part (as electric capacity etc.), and the structure of entire product has been carried out the layout of rationalizing, and has strengthened the sensor antijamming capability in magnetic field to external world greatly.

Description of drawings

Fig. 1: the passive open-flux path magnetoelectricity of the utility model hyperchannel speed pickup structural drawing;

Fig. 2: the passive open-flux path magnetoelectricity of the utility model hyperchannel speed pickup transverse sectional view;

Fig. 3: the passive open-flux path magnetoelectricity of the utility model hyperchannel speed pickup vertical cross-sectional;

Fig. 4: the passive open-flux path magnetoelectricity of the utility model hyperchannel speed pickup top view panorama sketch.

Label declaration: 1-first iron core; The 2-set bolt; The 3-bar magnet; The 4-coil; 5-second iron core; The 6-S utmost point, the 7-N utmost point; The 8-epoxy pouring sealant; The 9-shell; 10-terminal fixed head; The 11-connection terminal; The 12-cable interface; The 13-upper cover plate; 14-wiring bundle; The 15-electric connector.

Embodiment

Below with reference to figure and specific implementation process the utility model is described in further details:

The critical component material:

Iron core---electrical pure iron is through machining;

Bar magnet---be to form, have high-coercive force with the Rb-Fe-B material sintering;

Coil---with the coiling of QA155 enameled wire, and the process paint-dipping process forms;

Binding post---make electroplate with the HT68 material;

Cable---high temperature resistant, cold-resistant, anticorrosive, highly-flexible degree, two sheath shielded cables.

The critical component function:

Iron core: low magnetic resistance path is provided, the variable quantity of magnetic flux is passed to coil;

Casting glue: for inner magnetic circuit provides insulation protection, withstand voltage protection, anticorrosion etc.

Bar magnet: reliable and stable magnetic field intensity is provided.

(1) calculating of inductance:

After the decision of loop construction size, can calculate the hollow coil inductance earlier:

${\mathrm{<figure-callout\; id="0"\; label="L"\; filenames="HSA00000043733900022.png"\; state="\{\{state\}\}">L</figure-callout>}}_0=\frac{4\mathrm{\&pi;}{R}_0{N}^{2}M}{L}[\mathrm{\&pi;}{R}_{0}K-t(0.693+G)]\&times;{10}^{-7}$

In the formula: R ₀: the coil mean radius;

N: coil turn;

M: coil divides progression;

L: loop length;

T: coil thickness;

G, K: coefficient.

Real core inductance has:

L＝L ₀×μ

In the formula: μ: be the actual magnetic conductance.

(2) distributed capacitance calculates

$C=\frac{\mathrm{\&pi;\&epsiv;}{\mathrm{\&epsiv;}}_0\mathrm{Db}}{(N-1){\mathrm{\&Delta;}}_{\mathrm{\&alpha;}}};$

Δ _αInter-level dielectric thickness; D is the radius of coil; B is the width of whole winding;

ε medium relative dielectric constant, ε ₀Be permittivity of vacuum.

Choosing of coil L, C will influence the measurement frequency range of magnetoelectric transducer.

This magnetoelectric transducer is that passive open-flux path reluctance type speed pickup is to utilize the variable reluctance principle that swing pinion is carried out non-contact measurement, realizes the detection to gear rotational speed.

This product technology parameter has:

1, working temperature :-40 ℃～+ 120 ℃

2, vibration and impact: 100g

3, scope: the 1.3Hz～1800Hz that tests the speed

4, output channel number: 6

5, phase differential: 130 ° ± 10%

6, output waveform: near sinusoidal ripple

7, output amplitude: during 1.3Hz 〉=1V; During 1800Hz 〉=80V;

8, insulation resistance: be not less than 50M Ω;

9, withstand voltage: 1500Vrms/50Hz/1min;

This sensor is made of jointly the ∏ shape magnet of multi-group coil, producing the multiplexer channel signal, determines phase differential between the multiplexer channel signal by the distance between each group ∏ shape magnet.The relation of the distance Y between its two groups of adjacent ∏ shape magnet and the phase differential Φ of adjacent two channel signals can be determined by following formula:

$Y=n*\frac{\mathrm{\&pi;D}}{Z}\&PlusMinus;\frac{\mathrm{\&phi;}}{360}*\frac{\mathrm{\&pi;D}}{Z}=\frac{\mathrm{\&pi;D}}{Z}(n\&PlusMinus;\frac{\mathrm{\&phi;}}{360})$

Wherein: n: distance Y the number of teeth of process;

D: be the external diameter of tested gear;

Z: be the number of teeth of tested gear.

This sensor is installed in when maintaining static on the motor gearbox, and the head of ∏ shape magnet is close to the rotating speed gear, and the gap is 1.10 ± 0.10mm.Because coil and magnet maintain static, when gear rotated, along with the variation in gap, the male and fomale(M﹠F) of tooth made the magnetic resistance of magnetic circuit change, thereby has caused the power of the magnetic line of force, made coil produce induction electromotive force.The frequency f that this induction electromotive force changes is directly proportional with gear rotational speed v, and its relation can be determined by following formula:

f＝Z*v/60

Wherein: v: be tested gear rotational speed (r/min);

F: be sensor output frequency (Hz);

Z: be the number of teeth of tested gear.

When gear rotated, this sensor output frequency was the induced voltage signal of f, can be scaled gear rotational speed v by this frequency f, uses for the user.

As Fig. 1, this structure comprises two iron cores and a bar magnet is formed the ∏ shape, and the terminal profile end face of iron core is parallel with the gear teeth end face.Exposed iron core section should be on the concentric circles of measure speed gears.Form a good magnetic conduction face.Guarantee that air gap can not cause the waveform instability because of the error of the depth of parallelism.This product always has 3 groups of such parts.Form six passages.

Embodiment 1:

As Figure 1-3, a kind of magnetoelectric velocity transducer comprises shell 9, first iron core 1, second iron core 5, bar magnet 3, coil 4 in the enclosure is set and is arranged on cable interface 12 on the shell; First iron core 1 and second iron core 5 are fixed in the shell 9, all are wound with coil 4 on first iron core 1 and second iron core 5; Bar magnet 3 is arranged between first iron core 1 and second iron core 5, forms ∏ shape structure; Shell is stretched out in the outer end of first iron core 1 and second iron core 5, and first iron core 1 is opposite with the magnetic polarity of the outer end of second iron core 5; First iron core 1 and second iron core 5 all are electrically connected with cable interface 12.Described ∏ shape structure is 3 groups.Realize being electrically connected by connection terminal 11 and lead between cable interface 12 and first iron core 1 and second iron core 5, terminal fixed head 10 is fixed in the shell 9, and connection terminal 11 is installed on the terminal fixed head 10.First iron core 1 and second iron core 5 all are fixed in the shell 9 by set bolt 2.

As Fig. 4, the cable interface of magnetoelectric velocity transducer is connected with electric connector 15 by wiring bundle 14, the output electric signal.

Claims (4)

1. a magnetoelectric velocity transducer is characterized in that, comprises shell, first iron core, second iron core, bar magnet, coil in the enclosure is set and is arranged on electrical signal output interface on the shell; First iron core and second iron core are fixing in the enclosure, all are wound with coil on first iron core and second iron core; Bar magnet is arranged between first iron core and second iron core, forms П shape structure; Shell is stretched out in the outer end of first iron core and second iron core, and first iron core is opposite with the magnetic polarity of the outer end of second iron core; First iron core and second iron core all are electrically connected with electrical signal output interface.

2. magnetoelectric velocity transducer according to claim 1 is characterized in that, described П shape structure is 3 groups.

3. magnetoelectric velocity transducer according to claim 1 is characterized in that, described electrical signal output interface is a cable interface; Realize being electrically connected by connection terminal and lead between cable interface and first iron core and second iron core, the terminal fixed head is fixed in the enclosure, and connection terminal is installed on the terminal fixed head.

4. according to each described magnetoelectric velocity transducer of claim 1～3, it is characterized in that first iron core and second iron core are all fixing in the enclosure by set bolt.

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