KR20040073133A - Property Measurement Apparatus of Permanence Magnet - Google Patents

Abstract

PURPOSE: An apparatus for measuring a characteristic value of a permanent magnet is provided to improve the reliability by measuring characteristic values of samples within a chamber and comparing the characteristic values to each other. CONSTITUTION: A chamber(110) includes a temperature sensor, a humidity sensor, a heater, and a humidity controller. A plurality of rotary tables(120) are installed in the inside of the chamber. A plurality of through-holes are arranged on the rotary tables. A rotary shaft is formed at a center of the rotary table. An index driver is used for rotating the rotary shaft as much as an angle between the through-holes. A plurality of transferring jigs(150) are installed at lower parts of the rotary tables. A jig transfer unit transfers the transferring jig. A detector(140) is installed at an upper part of the rotary table in order to measure a characteristic value of a permanent magnet. A controller is used for controlling operations of the index driver, the jig transferring unit, the heater, and the humidity controller.

Description

Property Measurement Apparatus of Permanence Magnet

The present invention relates to an apparatus for measuring characteristic values of permanent magnets for measuring magnetic flux density and coercive force, which are characteristic values of permanent magnets, and more specifically, to measure reliability of a plurality of permanent magnets under the same conditions to improve reliability of measured values. The present invention provides a device for measuring the characteristic value of permanent magnets.

In general, permanent magnets are ferromagnetic objects. The magnetic property of the material is determined by the charge in the material, and when a voltage is applied from the outside, the charge in the material becomes magnetic-dipole and becomes magnetic.

In addition, when an external magnetic field is applied, these magnetic dipoles are arranged according to the external magnetic field, and an object whose characteristics do not change even after the applied external magnetic field is removed is called a ferromagnetic material.

The characteristics of the permanent magnets are represented by magnetic flux density (B), residual magnetic flux density (Br), and coercive force (Hc), and the range of use of the permanent magnets is determined by the characteristics of the permanent magnets. In order to produce permanent magnets used in precision instruments and devices, it is necessary to precisely measure changes in the characteristics of magnets with temperature and humidity.

Conventionally, the magnetic flux density and the coercive force of permanent magnets were measured to measure the properties of such permanent magnets. Here, the magnetic flux density represents the number of magnetic fluxes per unit area perpendicular to the direction of the magnetic flux, and the coercive force is represented by the intensity (Hc) of the potato system required to make the magnetic flux density zero after magnetizing to saturation. In addition, the residual magnetic flux density BR represents the magnetic flux density when the intensity of the magnetic field is zero in the hysteresis curve.

1 is a schematic view showing a characteristic measuring device of a permanent magnet according to the prior art, Figure 2 is a schematic diagram showing a measurement process according to the motor drive of the characteristic measuring device shown in FIG.

As shown in Figure 1 and 2, the characteristic measuring device 10 is connected to the servo motor 12 located outside the chamber 11, the thermostatic chamber, and the rotation axis of the servo motor 12 is a straight line rotational movement Gear box 13 to switch to the movement, the sample rod 30 is connected to the gear box 13, the linear movement and the measurement sample 20 is fixed to the end, and within the linear movement range of the measurement sample 20 It includes a detection coil 40 for measuring the characteristics of the measurement sample 20 to be moved so as not to interfere.

Although not shown in the drawings, a heater for maintaining a constant temperature is provided inside the chamber 11, and a thermometer 14, a magnetic flux meter 15, and a servomotor control unit 16 are disposed outside the chamber 11. ) Is located.

Thermometer 14 measures the temperature through a thermocouple 17 located inside the chamber 11, the magnetometer 15 is connected to the detection coil 40 so that the measurement sample 20 of the detection coil 40 It is a device for measuring the density change and magnitude of the magnetic flux by measuring the induction current generated in the detection coil 40 while passing through the vicinity, the servo motor controller 16 controls the drive of the servo motor 12 to measure the sample 20 ) To make constant velocity linear motion.

On the other hand, in order to measure the change in the characteristic value of the permanent magnet according to the temperature change, the magnetic flux density and the coercive force of the measurement sample 20 are measured while varying the temperature in the chamber 11.

However, in the conventional characteristic measuring apparatus, since only one measurement sample exists inside the chamber, in order to measure the characteristics of the plurality of measurement samples, the chamber must be opened and the replacement of the measurement sample should be performed.

When the chamber is opened in this way, the measurement conditions of the characteristic value of the first measured sample and the characteristic value of another measured sample are different so that the reliability of the measured characteristic value is lowered.

In addition, in order to measure a plurality of measurement samples, since the temperature of the chamber needs to be adjusted after the replacement and replacement of the measurement sample, it takes a long time to measure the characteristics of the plurality of measurement samples.

On the other hand, the conventional characteristic measuring device can not measure the characteristics of the rare earth permanent magnet (Nd Fe Bond). This is because a sufficient magnetic field cannot be applied to the rare earth permanent magnet and the rare earth permanent magnet cannot be saturated.

In addition, although the conventional characteristic measuring device does not consider the change of the characteristic value of the permanent magnet with respect to humidity, the permanent magnet used in precision instruments should also measure the change of the characteristic value with humidity.

The present invention has been proposed to solve the problems of the prior art as described above, by measuring the characteristics of each measurement sample after placing a plurality of rare earth permanent magnets under the same conditions, the reliability of the measured sample characteristics It is an object of the present invention to provide a permanent magnet characteristic measurement apparatus which can reduce the time required for measuring a plurality of measurement samples by performing continuous measurement of the sample characteristics under the same conditions.

1 is a schematic view showing a characteristic measuring device of a permanent magnet according to the prior art,

2 is a schematic view showing a measurement process according to the motor drive of the characteristic measuring device shown in FIG.

3 is a perspective view showing a characteristic measuring device of a permanent magnet according to an embodiment of the present invention,

Figure 4 is a perspective view showing the inside of the permanent magnet characteristic measurement device shown in Figure 3,

5 is a side cross-sectional view showing the set of rotary table, the magnet jig and the detection sensor shown in FIG.

6 is a plan view showing a set of rotary table, a magnet jig and a detection sensor shown in FIG.

7 is a cross-sectional view of the rotary table shown in FIG.

8 is a cross-sectional view of the detection sensor,

FIG. 9 is a flowchart illustrating a measurement process according to an operation relationship of the magnet jig illustrated in FIG. 5.

Explanation of symbols on the main parts of the drawings

100: characteristic measuring device 101: measurement sample

105: heater 107: humidity controller

110: chamber 120: rotating table

121: rotating shaft 122: through hole

130: index drive unit 140: detection sensor

150: magnet jig 151: support rod

152: support 160: jig drive unit

161: transfer rod 163: pneumatic unit

200: control unit 210: temperature sensor

220: humidity sensor 230: magnetic flux meter

In order to achieve the above object, the present invention provides a permanent magnet characteristic measuring apparatus comprising: a chamber having a temperature sensor, a humidity sensor, a heater, and a humidity controller installed therein and having a constant temperature and humidity function; A plurality of rotating tables having circular through holes, a rotating shaft fixed to a circular center of the rotating table, and an index driving unit configured to rotate the rotating shaft by an angle between the through holes, and formed in the rotating table. A plurality of transfer jigs positioned at the bottom of the rotary table, one for each rotary table corresponding to the through-holes, a jig transfer unit for transferring the transfer jigs in the vertical direction, and an upper portion of the rotary table in correspondence with the transfer jigs; A detector for measuring a characteristic value of the permanent magnet rising by the transfer jig, and the rotating tape And a control unit controlling the heater and the humidity controller to control the driving of the index drive unit and the jig transfer unit so that the permanent magnet located in the table is withdrawn after entering the detection unit. It is technical feature.

In addition, the jig transfer unit of the present invention is a non-magnetic support rod fixed to the feed rod which is located in parallel with the rotary shaft, the support is fixed to the rear end to the transfer rod, the through hole of the rotary table and fixed to the end of the support And a pneumatic unit fixed to an end of the transfer rod to expand and contract in the longitudinal direction of the transfer rod.

Preferably, one detection sensor and a transfer jig are positioned above and below each of the rotary tables, two transfer rods are positioned outside the rotary table, and one support is fixed to the two transfer rods. .

More preferably, a pedestal in which the permanent magnet is seated is fixed to the through hole of the rotary table, and the pedestal is a nonmagnetic material.

In the following, with reference to the accompanying drawings a preferred embodiment of the characteristic measuring device of a permanent magnet according to the present invention will be described in detail.

In the drawings, Figure 3 is a perspective view showing a characteristic measuring device of a permanent magnet according to an embodiment of the present invention, Figure 4 is a perspective view showing the interior of the permanent magnet characteristic measuring device shown in Figure 3, Figure 5 is Figure 4 A cross-sectional side view showing a set of rotary table, a magnet jig and a detection sensor shown in FIG. 6 is a plan view showing a set of rotary table, a magnet jig and a detection sensor shown in FIG. 5, and FIG. 8 is a cross-sectional view of the rotating table, and FIG. 8 is a cross-sectional view of the detection sensor, and FIG. 9 is a flowchart showing a measurement process according to the operation relationship of the magnet jig shown in FIG.

As shown in Figures 3 and 4, the permanent magnet characteristic measurement device 100 is formed with a door 113 to insert or withdraw a rare earth permanent magnet (hereinafter referred to as "measurement sample") and the constant temperature · A chamber 110 capable of maintaining a humidity state, a plurality of rotary tables 120 rotated in the chamber 110 and mounted with a measurement sample 101, and the rotary table 120 at a predetermined angle. A detection sensor 140 that measures the characteristics of the measurement sample 101 which is located at a point corresponding to the measurement sample 101 on the index driving unit 130 and the upper surface of each rotary table 120 to be rotated. And a magnet jig 150 and a jig driver 160 positioned below the rotary table 120 to raise the measurement sample 101 in correspondence with the detection sensor 140.

On the other hand, the control unit 200 of the permanent magnet characteristic measurement apparatus 100 is a temperature and humidity measured from the temperature sensor 210 and the humidity sensor 220 for measuring the temperature and humidity of the chamber 110 and the set temperature value and Adjust the heater 105 and the humidity controller 107 installed in the chamber 110 in comparison with the set humidity value, calculate the time to measure each measurement sample by the time input by the driver and the index driver according to the calculated time 130 and the operation of the jig driver 160, and the measured values and characteristics measured by the detection sensor 140 in accordance with the position information of the measurement sample and the operation sequence of the index driver 130 and the jig driver 160 The characteristic value of each measurement sample 101 is output in connection with the order of the measurement sample 101.

In the following, each component of the permanent magnet characteristic measuring apparatus and its organic coupling relationship will be described in more detail.

As shown in FIGS. 5 and 6, five rotating tables 120 are disposed in the chamber 110 in the vertical direction at predetermined intervals. The rotation shaft 121 penetrates the centers of the rotation tables 120, and the rotation tables 120 are fixed to the rotation shaft 121.

In this rotary table 120, twenty through holes 122 are formed along a circular circumference having a predetermined diameter. More specifically, 20 through holes 122 are formed along the circumference at intervals of 18 ° along the circumference of the rotary table 120, and the base 123 is fixed to the through holes 122. 123, the measurement sample 101 is seated. As shown in FIG. 7, the pedestal 123 is a nonmagnetic material, and a through hole is formed at the center thereof.

As shown in FIG. 6, in the rotation table 120, the angle between adjacent through holes 122 is 18 ° about the rotation axis 121.

On the other hand, the index driving unit 130 is connected to the lower end of the rotating shaft 121 to rotate the rotating shaft 121 by 18 °, the index driving unit 130 is located in the drive chamber 114 formed in the lower portion of the chamber 110, The rotating shaft 121 penetrates through the partition wall 115 separating the chamber 110 and the driving chamber 114 and penetrates the upper wall 116 of the chamber 110.

The self-aligning bearing 117 is fastened to the partition wall 115 and the upper wall 116, respectively, and the inner ring of the self-aligning bearing 117 is fixed to the rotating shaft 121 to support the rotating shaft 121 to freely rotate.

On the other hand, the detection sensor 140 as shown in Figure 8 is located above the respective rotary table 120.

The detection sensor 140 is a coaxial dual J-coil (J-coil), and when the measurement sample 101 enters the hollow of the detection sensor 140, an induction current is generated in the coil of the detection sensor 140 and a magnetic flux meter. In 230, the induced current is measured to measure magnetic flux density, which is a characteristic of the measurement sample 101.

The detection sensor 140 is fixed to the rear end of the inner surface of the chamber 110, the other detection sensors located on the top and bottom is fixed at intervals of 18 ° clockwise around the rotation axis (121).

On the other hand, the magnet jig 150 includes a support rod 151 which is a nonmagnetic material, and a support 152 for supporting the support rod 151 and moving the support rod 151 up and down.

The support bar 151 is located at the lower part of the rotary table 120 in correspondence with the hollow of the detection sensor 140, and moved to the upper part of the seat 123 while being inserted into the through hole of the seat 123 to be seated on the seat 123 ( 101 is pushed upward to the hollow of the detection sensor 140.

Then, when the time required for measuring the characteristic value of the measurement sample 101 in the detection sensor 140 elapses, the measuring table 101 is seated on the original pedestal 123 while moving downward again and then the rotating table 120. Located at the bottom of).

As such, when the magnet jig 150 is located at the original position, that is, the lower part of the rotary table 120, the index driving unit 130 rotates the rotary table 120 by 18 °, and then the magnet jig 150 operates in the order. The measurement samples 101 mounted on the five rotary tables 120 are measured.

In the permanent magnet characteristic measuring apparatus of the present invention, each of the detection sensor 140, the rotary table 120, and the magnet jig 150 is composed of one set, and a total of five sets are located inside the chamber 110.

On the other hand, the jig drive unit 160 is a transfer rod 161 located on both sides with respect to the point where the rear end of the detection sensor 140 is fixed, and a pneumatic unit 163 for transferring the transfer rod 161 in the vertical direction It includes.

A total of ten transfer rods 161 are located at both sides of the five detection sensors 140, respectively, inside the chamber 110, and a pair of support rods 152 of the magnet jig 150 are formed on the pair of transfer rods 161. Is fixed.

And the transfer rod 161 is located through the upper wall 116 and the partition wall 115, like the rotary shaft 121, a pair of transfer rod 161 is connected to each of the five pneumatic units 163 to stretch do.

These five pneumatic units 163 are located in the drive chamber 114. On the other hand, the cap 119 is fixed to the upper surface of the upper wall 116 of the chamber 110 and the upper end of the transfer rod 161 is located inside the cap 119.

The cap 119 is formed with a space of the flow length of the transfer rod 161 does not interfere with the transfer rod 161 to move up and down, and blocks air from entering the chamber 110.

On the other hand, the index drive unit 130 is provided with a rotation angle sensor to measure the rotation angle of the rotary shaft 121 and input to the control unit 200, the pneumatic unit 163 is provided with a solenoid valve is operated pneumatic unit Information 163 and the number of times of operation are input to the control unit 200.

In addition, the temperature sensor 210 and the humidity sensor 220 installed in the chamber 110 respectively input the measured temperature and humidity values to the controller 200 as electrical signals, and the magnetometer 230 is connected to the detection sensor 140. The magnetic flux density is calculated by measuring a flowing induction current and calculating a total flux line, and inputs the magnetic flux density to the controller 200.

Then, the control unit 200 detects the total magnetic force lines measured by the magnetometer 230 using the signals input from the rotation angle sensor and the solenoid valve. Then, the magnetic flux density for each measurement sample 101 seated on each rotary table 120 is stored and the residual magnetic flux density and coercive force are calculated using the magnetic flux density.

On the other hand, if the measured temperature value and humidity value is lower or higher than the set temperature value and humidity value, the controller 200 compares these measured values with the set value and operates the heater 105 or the humidity controller 107 to operate the chamber 110. Keep the temperature and humidity inside.

Therefore, in measuring the measurement sample 101 located in the chamber 110, the same conditions are established to improve the reliability of the measured characteristic value of the measurement sample 101.

In addition, in some cases, the temperature and humidity of the chamber 110 may be controlled by controlling the heater 105 and the humidity controller 107, and thus the conditions of the measurement sample 101 may be varied while varying the temperature and humidity inside the chamber. To change the value.

In addition, the control unit 200 is connected to the input device 240 that the operator manually inputs, peripheral devices such as the monitor 250 and the printer 260 that is output to the screen.

The following describes the measurement relationship of the characteristic measuring device of the permanent magnet configured as described above.

The measurement samples 101 to be measured are seated on the pedestals 123 fixed to each of the rotary tables 120. Then, the time to measure the measurement sample 101 and the temperature change rate according to the time is set and input.

Then, after inputting the position of each measurement sample 101 seated on the rotary table 120 to the control unit 200, the total time for measuring all the measurement samples 101 is set and input to the control unit 200.

Then, the control unit 200 calculates a measurement time for each measurement sample to measure all the measurement samples or a part of the measurement sample inputted within the set time, the rotational speed of the index drive unit 130 and the pneumatic unit 163 Calculate the operating time of.

When the input operation of the characteristic value measuring device is completed as described above, the temperature rises according to the temperature change rate. After the calculated time elapses, the magnetic flux measurement of the sample is performed. At this time, the control unit 200 operates the index drive unit 130 and the pneumatic unit 163 according to the calculated rotational speed of the index drive unit 130 and the operating time of the pneumatic unit 163.

Through this process, when the measurement of the measurement sample 101 is completed, the temperature inside the chamber 110 is lowered. The controller 200 calculates magnetic flux density, coercive force, and magnetic flux temperature coefficient which are characteristic values using the measured magnetic flux. The calculated analysis data is output to a monitor or a printer.

As described in detail above, the characteristic measuring apparatus of the permanent magnet of the present invention has the advantage that the reliability is improved when comparing the characteristic values by measuring the characteristic values of the plurality of measurement samples in the chamber maintaining the same conditions.

In addition, the characteristic measuring device of the permanent magnet of the present invention can shorten the time required for measuring a plurality of measurement samples, as it is possible to set a plurality of measurement samples to be measured within a predetermined time by using the index driving unit and the pneumatic unit. There is an advantage.

Although the technical idea of the characteristic measuring apparatus of the permanent magnet of the present invention has been described together with the accompanying drawings, this is illustrative of the best embodiment of the present invention and is not intended to limit the present invention.

Claims (4)

In the permanent magnet characteristic measuring apparatus, A temperature sensor, a humidity sensor, a heater, and a humidity controller installed inside the chamber having a constant temperature and humidity function; A plurality of rotary tables positioned in the chamber and having a plurality of through holes arranged in a circular shape; An index driving part having a rotating shaft fixed to a circular center of the rotating table and rotating the rotating shaft by an angle between the through holes; A plurality of transfer jigs positioned below the rotary table, one for each rotary table corresponding to the through holes formed in the rotary table; Jig transfer unit for transferring the transfer jig in the vertical direction, A detection unit which is located in an upper portion of the rotary table corresponding to the transfer jig and measures a characteristic value of the permanent magnet which is raised by the transfer jig; And a control unit controlling the heater and the humidity controller to control driving of the index driving unit and the jig transfer unit so that the permanent magnet located at the rotating table is withdrawn after entering the detection unit. Permanent magnet characteristic value measuring device, characterized in that. The method of claim 1, The jig transfer part includes a transfer rod positioned in parallel with the rotation shaft, a support having a rear end fixed to the transfer rod, a support rod which is a non-magnetic material corresponding to the through hole of the rotation table, and fixed to the end of the support, and the transfer rod Permanent magnet characteristic measurement device characterized in that it comprises a pneumatic unit fixed to the end of the conveying rod in the longitudinal direction of the conveying rod. The method of claim 2, One detection sensor and a transfer jig for each rotary table are positioned above and below, two transfer rods per rotation table are positioned outside the rotary table, and one support is fixed to the two transfer rods. Permanent magnet characteristic value measuring device. The method according to claim 1 or 2, A pedestal for fixing the permanent magnet is fixed to the through hole of the rotary table, and the pedestal is a non-magnetic material, characterized in that the permanent magnet characteristic value measuring device.