JPS62190824A - Electromagnetic apparatus assembling device - Google Patents

Abstract

PURPOSE:To reduce fluctuation in characteristic of an electromagnetic apparatus by measuring the amount of gap between a magnet and a yoke and magnetizing the magnet by controlling the optimum magnetizing power which makes minimum the fluctuation of characteristic of electromagnetic apparatus depending on said amount of gap. CONSTITUTION:Outputs of electronic micro-pickups 30, 31 are applied to a gap calculator 32 and thereby amount of gap g between the magnetic pole surface of magnet 5 and a printed wiring substrate 7 is calculated. This amount of gap g is input to an optimum power controller 33 and thereby a magnetizing power, which provides the design characteristic of motor placed on a setting board 40, can be obtained. The optimum power controller 33 controls capacity of capacitor and charging voltage in a magnetizing power supply 34. When the magnetizing power supply apparatus is charged, preparing for magnetization, electrical power is supplied to an excitation winding 12 of magnetizing yoke 10. When power is supplied to the excitation winding 12, intensive magnetic field is generated at the lower end surface of magnetization yoke 10 and this magnetic field passes through a back yoke 4 and magnetizes a magnet 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an IIT magnetic equipment equipment using permanent magnets.

BACKGROUND OF THE INVENTION In recent years, electromagnetic devices and actuators equipped with permanent magnets have been increasingly used in electrical devices, and there is a strong demand for smaller size, lighter weight, and higher performance.

An example of its configuration will be explained with reference to FIG. Figure 3 shows a generally well-known planar opposed type motor.As shown in Figure 3, a magnet 5 is attached to a shaft 3 which is rotatably supported by bearings 2゜2' provided in a holder 1. . The magnet 5 is magnetized with a plurality of poles in the rotation direction, and is configured to be rotated by the urging of a drive coil 6 disposed on a printed circuit board 12 made of a magnetic material.

Here, the magnet 5 is magnetized with the magnet 5 adhered to the back yoke 4, as shown in FIG.
A plurality of grooves (not shown) are provided on the surface of the rI magnetic yoke 10 facing the magnet 5, and the excitation winding 12 is wound around the grooves. The magnetic pole face of the magnet 5 is opposed to this magnetizing yoke 10, and the excitation winding 12 is attached with a T6
1 power is supplied to magnetize the magnet 5.

Problems to be Solved by the Invention Incidentally, as the dimensions of motors are required to be thinner and lighter, it is desirable to make them as small as possible, but on the other hand, motors that are required to be mass-produced must minimize variations in their characteristics. It is also important to do.

However, motor characteristics largely depend on magnetic flux density. On the other hand, the magnetic flux density is greatly influenced by the amount of air gap g between the magnetic pole surface of the magnet 5 and the printed circuit board 7 made of magnetic material, as shown in FIG. In general, in a planar opposed motor having the above configuration, variations in the thickness of the magnet 5, the printed circuit board 7 made of a magnetic material, etc. are added to increase the variation in the air gap 1g. Therefore, if the actual gap amount g is ignored and the magnet 5 is magnetized to saturation, the characteristics will vary depending on the product, such as being able to obtain very good characteristics and vice versa. will increase significantly.

Therefore, in order to suppress the variation in characteristics within a certain tolerance range, it is generally necessary to improve the accuracy of the individual components that make up the motor, or to attach an adjustment mechanism to the electromagnetic aperture for attaching the magnet while adjusting the air gap of 1 g. However, there are problems in that the cost is significantly increased, wear and tear increases, and the weight increases by one dimension.

Means for Solving the Problems The technical means of the present invention for solving the above problems includes a magnet, a yoke for closing the magnetic path of the magnet, and an electromagnetic device disposed through a predetermined gap. During assembly, the amount of air gap between the magnet and yoke is measured, and then the magnet is magnetized by controlling the optimum magnetizing power based on the amount of air gap to minimize the variation in the characteristics of the electromagnetic device. It is something.

action The effect of this technical means is as follows.

In other words, as mentioned above, the magnet 7 is
By measuring the amount of air gap between the magnet and yoke, and controlling the optimum magnetizing power from the amount of air gap to minimize the variation in the characteristics of TM devices such as Morph, magnetizing the magnet. Variations in the amount of air gaps are no longer reflected in variations in magnetic flux density, and therefore variations in device characteristics can be reduced without significantly changing the structure of the device.

EXAMPLE Hereinafter, an example of the present invention will be explained based on the drawings. 1st
The figure is a block diagram of a motor assembly device in one embodiment of the present invention.

The ring-shaped magnet 5 is fixed to a back yoke 4 made of a magnetic material by adhesive or the like, and the back yoke 4 is press-fitted into the shaft 3. The shaft 3 is rotatably inserted into bearings 2 and 2' provided in the holder 1. A printed circuit board 7 made of a magnetic material, which also serves as a yoke for closing the magnetic path of the magnet 5, is fixed to the holder 1, and a drive coil 6 is bonded onto the printed circuit board 7.

When assembling, place the motor on the motor stand 40,
Further, a magnetizing yoke 10 is placed above the motor. Here, the lower end surface of the magnetizing yoke 10 comes into contact with the end surface of the back yoke 4. The lower end surface of the magnetizing yoke 10 has a plurality of S(
(not shown), and an excitation winding 12 coated with insulation is wound around this groove.

A linear motor 41 is also provided on the stand 40, and when the motor is placed on the stand 40, the linear motor 41 moves an electronic micro-buck-up 30.31 into the gap between the magnet 5 and the printed circuit board 7. inserted into.

The outputs of the electronic micro pick amplifiers 30 and 31 are applied to the air gap calculator 32 to calculate the air gap g between the magnetic pole face of the magnet 5 and the printed circuit board 7. Furthermore, the value of this gap amount g is manually inputted to the optimum power controller 33 to determine the magnetizing power that will bring the characteristics of the motor placed a on the mounting table 40 to the design value. The optimum power controller 33 controls the capacitor capacity and charging voltage inside the magnetizing power supply device 34.

When the magnetizing power supply device is charged and ready for magnetization, power is supplied to the excitation winding 12 of the magnetizing yoke 10. When power is applied to the excitation winding 12, a strong magnetic field is generated at the lower end surface of the magnetizing yoke 10, and this magnetic field passes through the hack yoke 4 and magnetizes the magnet 5.

Next, the operation of this embodiment will be explained.

When the air gap g between the magnetic pole surface of the magnet 5 and the printed circuit board 7 is equal to the design value, the strength H of the magnetic field generated at the lower end surface of the magnetizing yoke 10 is H = Ho
Magnetizing power is applied from the magnetizing power supply device 34 to the excitation winding 12 so that. Here, the value of Ho is set so that the magnetization state of the magnet material is several percent lower than the saturated state (100% state in FIG. 2).

Next, if the void amount g is larger than the design value,
If the strength of the field is H=Ho, the magnetic flux density between the magnetization node 5 and the printed circuit board 7 will be lower than the design value, and the motor characteristics will also be degraded.However, in this case, the strength of the magnetizing magnetic field H When the magnetization power is controlled and magnetized so that the value becomes larger than Ho, the strength of magnetization of the magnet 5 is
It becomes larger than the design value. Therefore, even though the air gap 1g is larger than the design value, the magnetic flux density between the magneto node 5 and the printed circuit board 7 can be made close to the design value, and the motor characteristics can be obtained with values extremely close to the design values. things become possible.

Next, when the air gap amount g is smaller than the design value, if the strength H of the magnetizing magnetic field is H6, then the magnet 5 and the printed circuit board 7
The magnetic flux density between the two ends will rise above the design value, and the motor characteristics will improve over the design value. But in this case @
When the magnetization power is controlled and magnetized so that the strength H of the magnetic field becomes a value smaller than Ho, the strength of magnetization of the magnet 5 becomes smaller than the designed value. Therefore, even though the air gap amount g is smaller than the design value, the magnetic flux density between the magnet 5 and the printed circuit board 7 can be brought close to the design value, and the motor characteristics can be obtained extremely close to the design value. It becomes possible.

Further, in the conventional method of magnetizing the magnet 5, the magnetic pole face of the magnet 5 is opposed to the magnetizing yoke 10. Therefore, if the thickness of the magnet 5 is extremely thin compared to its diameter, and the magnet material has a small coercive force compared to the residual magnetic flux density, when the magnet 5 is removed from the magnetizing yoke 10, There was a problem in that the characteristics of the magnetic material could not be fully utilized. - In the used book embodiment, magnetization is performed with the magnet 5 facing the printed circuit board 7 made of a magnetic material, that is, with the magnetic circuit closed. Therefore, it also has the effect of preventing self-demagnetization that occurs when the magnet is magnetized and removed from the magnetization yoke.

Although this embodiment is applied to a plane facing type motor, it can also be applied to a plane facing type motor with a completely similar configuration.

Although the above embodiments have been described with respect to motors, it is obvious that the present invention is not limited to motors and can be applied to all kinds of electromagnetic devices using permanent magnets.

Effects of the Invention The present invention is capable of assembling a magnet, a yoke for closing the magnetic path of the magnet, and an electromagnetic device arranged with a predetermined gap in between, even if the amount of gap between the magnet and the yoke varies. By controlling the magnetizing power of the magnet, it is possible to reduce variations in the characteristics of the electric M1 equipment.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a motor assembly device according to an embodiment of the present invention, FIG. 2 is a magnetization curve diagram of a magnet throat, and FIG.
The figure is a cross-sectional view of a conventional motor, and FIG. 4 is a diagram showing the state of magnetization of the magnet of the conventional motor. 5... Magnet, 7... Printed circuit board, 10... Magnetizing yoke, 30.31...
・・Electronic Micro Pink Up, 32・・・・−・
Gap amount calculator, 33...Optimum power controller, 34
...Magnetizing power supply device. Name of agent: Patent attorney Toshio Nakao and 1 other person Figure 2 1 1' = 1-7. Luk-Figure 3 2.2'-II! I÷3-11th 4-ba'・y73-2 5--7 Punen 1 Figure 4

Claims (1)

[Claims] In the assembly of an electromagnetic device including a yoke made of a magnetic material and a permanent magnet arranged through a predetermined gap, a magnetizing device for the permanent magnet and a measuring means for measuring the amount of gap between the permanent magnet and the yoke are provided. and a control means for controlling the optimum magnetizing power of the magnetizing device based on the amount of air gap obtained by the measuring means.