JPS63263481A - Magnetic attractive force measuring instrument - Google Patents

Abstract

PURPOSE:To easily take a measurement in a short time by finding the magnetic attractive force of a coil by varying the relative position between a plunger and the coil and the passing current of the coil stepwise automatically. CONSTITUTION:A control means 31 sets a feed current value to the coil 3 to a prescribed value through a current setting means 32. A clearance setting means 33 sets a clearance to a prescribed value and a comparing means 34 compares it with the actual clearance from an amplifier 13. A pulse generating means 35 generates pulses corresponding to the difference output signal and a pulse motor is rotated or reversed through a driver 14 to set a difference output signal to zero. Then when the coil 3 is fed with a set current, the attractive force F of a solenoid 3 is written in a memory 36 from an amplifier 12 together with the set values of the current and clearance. Then prescribed values are added to the clearance and current value to find the attractive force F. This operation is repeated to display the relation between the clearance and attractive force F based upon a coil current as a parameter on soft copy and hard copy generating means 21 and 22.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a magnetic attraction force measuring device, and in particular to a magnetic attraction force measuring device suitable for measuring attraction force characteristics of a solenoid, etc. be.

(Prior Art) When manufacturing various devices using solenoids, it is important to know the suction force characteristics of the solenoid, that is, the relationship between the clearance between the field core and the moving core and the suction force, in order to improve the performance of the device. This is extremely important.

It is also important to obtain various attractive force characteristics using the current applied to the coil as a parameter.

This measurement of the suction force characteristics is performed manually.

(Problem to be solved by the invention) Devices that measure the magnetic flux density or the number of magnetic fluxes generated by a coil have been proposed in the past, but the magnetic force (attractive force) of the coil is continuously measured in accordance with the applied current. No device has yet been proposed to detect and display this information. That is, measuring the attraction force characteristics of the coil requires a lot of effort and time.

The present invention has been made to solve the above-mentioned problems.

(Means and operations for solving the problems) In order to solve the above problems, the present invention provides a current value setting means for setting the current flowing to the coil, and a current value setting means connected to the plunger to adjust the magnetic attraction force of the coil. A magnetic attraction force detection means for detecting, a relative position setting means for setting the relative position of the plunger and the coil, and a relative position moving means for changing the actual relative position of the plunger and the coil according to the output of the relative position setting means. The magnetic attraction force of the coil is automatically detected while changing the current applied to the coil and the relative position between the plunger and the coil.

As a result, the relationship between the current applied to the coil, the relative position of the plunger and the coil, and the magnetic attraction force of the coil can be automatically detected, making it possible to measure the attraction force characteristics of the coil without any effort. This can produce the effect that it can be carried out in a short period of time.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic block diagram of one embodiment of the present invention.

In the figure, a pedestal 2 and a pedestal 7 are provided at both ends of the base 1.
are fixed, and a rail IA and a guide rod IB are arranged between them.

The pedestal 4 is configured such that its legs 4A are placed on the rail IA, engage with the guide bar IB, and are slidable along the guide bar IB.

The solenoid 3 (work) is mounted on the pedestal 2.

A strain gauge 5 and a linear sensor 6 are mounted on the pedestal 4. The stress detection section 5A of the strain gauge 5 is a moving core (blunger) of the solenoid 3.
Connected to 3B. Further, the linear sensor 6 is
It is installed so that the position of the strain gauge 5, that is, the actual clearance (gap) A between the moving core 3B and the field core 3A of the solenoid 3 can be detected. In other words, the linear sensor 6 is attached to the pedestal 4 so as to be able to detect the relative position between the coil and the plunger.

The micro head 9 is configured such that when its input shaft 9A is rotated in the direction of arrow P, its output shaft 9B moves forward and backward in the direction of arrow S. The main body of the micro head 9 is attached to the pedestal 7, and its output shaft 9B is attached to the pedestal 4.
Further, the input shaft 9A is connected to the rotation 1dl of a pulse motor 8 attached to the pedestal 7.

the solenoid 3, the strain gauge 5, the linear sensor 6,
The pulse motor 8 is connected to a microcomputer 15 via a current power source 11, an amplifier 12, an amplifier 13, and a driver 14, respectively.

As is well known, the microcomputer 15 has a CPU 1
6, a ROM 17, a RAM 18, an input/output interface 19, and a common bus 20 connecting them.

The input/output interface 19 is connected to soft copy making means 21 and/or hard copy making means 22 .

FIG. 1 is a functional block diagram of an embodiment of the present invention. In FIG. 1, the same reference numerals as in FIG. 2 represent the same or equivalent parts, so their explanation will be omitted.

In FIG. 1, the current value setting means 32 is connected to the control means 31.
The current value of the current supplied to the solenoid 3 from the current power supply 11 is set, and the value is set as the current value of the current supplied to the solenoid 3 from the current power supply 11.
1 and output to memory 36.

The output of the strain gauge 5, that is, the attraction force F of the solenoid 3 is output to the memory 36 via the amplifier 12.

The clearance setting means 33 is energized by the control means 31, sets a clearance a between the field core 3A and the moving core 3B, and outputs the value to one terminal of the comparison means 34 and the memory 36.

The output of the linear sensor 6, that is, the actual clearance A between the field core 3A and the moving core 3B is
The signal is outputted to the other terminal of the comparison means 34 via the amplifier 13.

The comparison means 34 detects the difference between the clearance a set by the clearance setting means 33 and the actual clearance A output from the amplifier 13, and outputs a signal corresponding to the difference to the control means 31 and the pulse generation means. Output to 35.

The pulse generating means 35 generates a pulse according to the signal output from the comparing means 34. This pulse is supplied to the pulse motor 8 via the driver 14.

When the signal output from the comparison means 34 becomes zero, the control means 31 energizes the memory 36 to increase the current value set by the current value setting means 32 and the current value of the solenoid 3 output from the amplifier 12. The suction force F1 and the clearance a set by the clearance setting means 33 are stored.

Then, the current value ■, attraction force F, and clearance a
is outputted from the memory 36 to the soft copy creating means 21 and/or the hard copy creating means 22.

The operation of one embodiment of the present invention having the above configuration will be explained in the first section.
This will be explained with reference to FIG. FIG. 3 is a flowchart showing the operation of one embodiment of the present invention.

In this embodiment, the energizing current value I to the coil of the solenoid 3 is
The relationship between the clearance between the field core 3A and the moving core 3B and the suction force F of the solenoid 3 is determined using as a parameter. The current value l applied to the coil is within the range of 0.2 to 0.9 [A] and 0.9 [A]. The clearance a is set for every 1 [A], and the clearance a is within the range of 1 to 6 [mml] and 0. 1 [
It shall be set for each mml.

In FIG. 3, first in step S1, the control means 31
In response to the output signal, the current value setting means 32 sets the current value I to the coil to 0. 2 Set to [A].

In step S2, the output signal of the control means 31 causes the clearance setting means 33 to set the clearance a to 1.
It is set to [m+s].

In step S3, the actual clearance A output from the amplifier 13 is read into the comparing means 34.

In step S4, it is determined whether the actual clearance A is equal to the set clearance a. If not, in step S5, it is determined whether the clearance A is smaller than the clearance a.

If the actual clearance A is smaller than the set clearance a, step S
At 6, pulses are supplied from the pulse generating means 35 to the driver 14 in accordance with the output of the comparing means 34, and the pulse motor 8 is rotated forward or reverse. If the actual clearance A is larger than the set clearance a, the pulse motor 8 is rotated in the reverse or normal direction in step S7 so that the clearance A becomes smaller. Then, the process returns to step S4 again.

When the output signal of the comparing means 34 becomes zero and it is determined in step S4 that the clearance A is equal to the clearance a, in step S8 the current value (0, 2[A]') set in step S1 is Alternatively, the coil of the solenoid 3 is energized with a current value set in step S14, which will be described later. Then, in step S9, the output signal of the amplifier 12, that is, the signal of the attraction force F of the solenoid 3 is detected.

In step SIO, the current value set by the current value setting means 32, the clearance a set by the clearance setting means 33, and the attraction force F of the solenoid 3 output from the amplifier 12 are written in the memory 36, Thereafter, in step Sll, the energization of the coil is canceled.

In step S12, the clearance a is 0.1
is added, and in step S13, it is determined whether the clearance a is larger than 6. If the clearance a is not larger than 6, the process moves to step S3, and if it is larger, the process moves to step S14.

In step S14, 0 and 1 are added to the coil current ■, and in step S15, the current value I becomes 0.
．． 9 It is determined whether or not the value is larger than [A]. Current value ■ is 0. If it is not larger than 9 [A], the process moves to step S2, and if it is larger, the process moves to step 516.

In steps S1 to S15, the relationship between the clearance A and the attraction force F can be obtained using the coil current l as a parameter.

Specifically, the value of the attractive force F can be obtained when the coil current l is in the range of 0.2 to 0.9 [A] and the clearance A is in the range of 1 to 6 [mml].

Then, in step 816, the relationship between the clearance A and the attractive force F using the coil current I as a parameter is displayed by the soft copy creating means 21 and/or the hard copy creating means 22.

Now, in the above embodiment, it was explained that the relationship between the clearance and the attraction force is obtained using the current applied to the coil as a parameter, but the present invention is not limited to this, and the clearance is used as a parameter. , the relationship between the current applied to the coil and the attractive force may be obtained.

In addition, although the description has been made assuming that the magnetic attraction force F of the solenoid 3 having the field core 3A at its center is measured,
It goes without saying that the magnetic attraction force of a coil without a field core may be measured.

In this case, the plunger may be placed near the coil, and the relative position between the plunger and the coil may be used as a parameter instead of the clearance described above.

(Effects of the Invention) As is clear from the above description, according to the present invention, the following effects are achieved. In other words, the relative position of the plunger and the coil, and the current applied to the coil are automatically and stepwise changed, and the magnetic attraction force of the coil in each case is determined, so the attraction force characteristics of the coil can be determined. It can be done in a short time and easily.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of an embodiment of the invention, FIG. 2 is a schematic block diagram of an embodiment of the invention, and FIG. 3 is a flowchart showing the operation of an embodiment of the invention. 1... Base, 2,4.7... Frame, 3... Solenoid, 5... Strain gauge, 6... Linear sensor,
8... Pulse motor, 9... Micro head, 11
...Current power supply, 12.13...Amplifier, 14...
Driver, 15... Microcomputer, 21...
- Soft copy creation means, 22... Hard copy creation means, 31... Control means, 32... Current value setting means, 33... Clearance setting means, 34... Comparison means, 35... Pulse generating means, 36...memory

Claims (5)

[Claims] (1) Magnetic attraction force of the coil, current flowing to the coil,
A magnetic attraction force measuring device for measuring the relationship between the relative positions of a plunger and a coil, comprising: a current value setting means for setting a current to be applied to the coil; and a current value setting means for energizing the coil in accordance with an output of the current value setting means. a power supply means; a magnetic attraction force detection means connected to the plunger to detect the magnetic attraction force of the coil; a relative position setting means for setting the relative positions of the plunger and the coil; and in accordance with the output of the relative position setting means, relative position moving means for changing the actual relative positions of the plunger and the coil; storage means for storing output signals of the current value setting means, the magnetic attraction force detection means, and the relative position setting means; and connected to the storage means. What is claimed is: 1. A magnetic attraction force measuring device, characterized in that it comprises a display means. (2) The relative position moving means includes relative position detecting means for detecting the actual relative positions of the plunger and the coil;
The invention is characterized by comprising a motor connected to either one of the plunger or the coil, and motor energizing means for energizing the motor in accordance with a difference between output signals of the relative position detecting means and the relative position setting means. A magnetic attraction force measuring device according to claim 1. (3) The magnetic attraction force measuring device according to claim 2, wherein the relative position detection means is a linear sensor. (4) The motor is a pulse motor, and the motor energizing means includes a comparison means for detecting a difference between the output signals of the relative position detection means and the relative position setting means, and a comparison means for detecting a difference between the output signals of the relative position detection means and the relative position setting means, and , a magnetic attraction force measuring device according to claim 2 or 3, further comprising pulse generating means for outputting pulses to the pulse motor. (5) Claims 1 to 4, wherein the magnetic attraction force detection means is a strain gauge.
The magnetic attraction force measuring device according to any one of paragraphs.