Magnetoelectricity type passive velocity transducer and manufacturing technology thereof

Abstract

The invention relates to a magnetoelectric passive speed sensor used for measuring the rotating speed of a dropping speed apparatus and the manufacturing technique thereof. The failure problem that the speed sensor of the dropping speed apparatus works in the high temperature environment can be effectively avoided. The magnetoelectric passive speed sensor is composed of a plug apparatus and a speed sensor which are respectively and fixedly arranged at both ends of an insulated wire sleeved in a heat shrinkable sleeve. The manufacturing technique comprises the steps as follows: a magnet, a mica sheet and a plug are fixed together by thin electronic silica gel; an iron core is arranged in a coil framework and wound on the coil framework through an enamel covered wire; the coil framework and the combination body of the magnet, the mica sheet and the plug are sleeved at the tail part of an outer shell in sequence; a wire button 30 is sleeved at the head part of the outer shell through the plug, and a double insulated wire led out by the wire button 30 is electrically connected with the coil framework through a leading wire; a layer of base coating solvent is coated in the outer shell; double components of silica gel are filled in the inner wall of the outer shell to perform the integral encapsulation in the cavity formed by the wire button 30, the coil framework and magnet; and the double insulated wire in a heat shrinkable pipe which is led out by the wire button 30 is connected to the plug apparatus.

Description

technical field [0001] The invention relates to a high-temperature-resistant, high-sensitivity, magnetoelectric passive speed sensor for measuring the speed of a retarder. Background technique [0002] CN 200520020923.X announced a "magnetic-electric vehicle speed sensor". The purpose of the invention is to provide an optimized design structure and reduce product cost. The technical solution is: in the shell of the sensor, there is a soft magnetic core on the upper part, and a probe with a coiled induction coil on the lower part. Permanent magnetic steel is installed between the soft magnetic core and the probe. The connected shielding wire is provided with a magnetically conductive signal tooth plate with several teeth on the outer circumference under the bracket. [0003] Its disadvantages are: [0004] 1. The magnetoelectric vehicle speed sensor is only suitable for measuring engines, transmissions and other environments where the ambient temperature is not high and th...

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Problems solved by technology

[0005] 2. The area of ​​the permanent magnet is small, the magnetic flux is small, and the induced voltage generated is small, so the sensitivity is not high and the effective sensing distance is small

[0006] 3. The structure and process without temperature resistance, this structure is limited to use in the case of low ambient temperature, because the general retarder turntable heats up high, and the radiation temperature can be as high as 200 ° C, therefore, it cannot be used for retarders Turntable speed

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