Magnet measuring device and magnet measuring method

Abstract

The invention discloses a magnet measuring device and a magnet measuring method. The magnet measuring device comprises a lead screw with a screw and nuts, a motor used to drive the screw in the lead screw to rotate, a measuring table which is provided with a probe hole, a magnet locating plate, and a Hall probe block. The magnet locating plate is provided with a location hole which is used to place a to-be-tested magnet, and the magnet locating plate moves on the measuring table with movement of the nuts of the lead screw. The Hall probe block is provided with a Hall sensor, and is used to measure magnetic fields of each position of the to-be-tested magnet, the to-be-tested magnet passing above the Hall sensor. The Hall probe block is disposed in the probe hole of the measuring table. The magnet measuring method uses forward and reverse measuring, numerical filter, and curve fitting. Using the magnet measuring device and the magnet measuring method can greatly improve efficiency. The device provided in the invention can make a surface of the magnet maintain contact with the sensor, and defects of inaccurate measuring results caused by an unstable air gap or an excessive air gap are overcome.

Description

technical field [0001] The invention relates to a measuring device and method, in particular to a device and a corresponding method for measuring the surface magnetic distribution of a magnet and the width of a neutral zone. Background technique [0002] The surface magnetic distribution characteristics of a multi-pole magnet is an extremely important parameter for the performance of the magnet. Among them, the width and position of the neutral zone (also known as the transition zone) have a significant impact on the performance of each pole of the product: the position shift of the neutral zone will cause The surface magnetic peak value of each adjacent magnetic pole of the magnet is asymmetrical, and the deviation of the width of the neutral zone will lead to the deviation of the apparent magnetic pole difference of each adjacent magnetic pole in the magnet. In actual production, the characteristics of the neutral zone have important guiding significance for product magnet...

AI Technical Summary

Problems solved by technology

This measurement method has the following defects: 1. For the protection of the magnet and the Hall sensor, a certain gap must be reserved between the two, and the formed air gap causes the magnetic field to attenuate severely, so the measured data cannot be true Reflecting the magnetic field value at this point often requires some kind of compensation algorithm

2. The general-purpose Gauss meter probe is implanted with a Hall sensor and then sealed and cured in a small rod. Since the Hall sensor is extremely small, there is a certain deflection angle in the cured Hall sensor.

Since the magnetic field under the effective area is not uniform, there must be differences in the measured data

3. The lack of processing of the phase difference caused by the damping effect in the motion measurement, resulting in a small deviation in the measurement results

4. The current method and equipment are based on the measurement of a single large-sized magnet, but there is very little support for batch measurement of small-sized magnets, so the efficiency is low

[0005] As for the measurement method of the neutral zone, the method of measuring after projection of the magnetic pole observation sheet is mainly used at present. Many uncertainties such as the subjective judgment boundary determine the accuracy of the measurement results of the magnetic pole size is extremely poor

[0006] There is also a magnetic test device for bonding NdFeB multi-pole magnetic rings, but this device can only rotate a single magnet manually, and relies on manual readings to obtain the maximum and minimum values ​​of the magnetic ring

Manually controlling the speed and manually capturing the extreme value of the Gauss meter makes it impossible for the device to measure the surface magnetic curve and the measurement of the neutral zone and magnetic pole width in principle.

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