JPS5821306A - Magnetizing method by opposed type multiple poles - Google Patents

Abstract

PURPOSE:To realize multiple pole magnetization for a magnet with a coersive force equal to or larger than 3KOe by a method wherein magnetizing poles are arranged opposed to each other inside and outside a cylindrical magnet with a coersive force not smaller than 3KOe. CONSTITUTION:Magnetizing poles 1 and 5, wound with Cu wires 2 and 4, are arranged facing each other, inside and outside a cylindrical magnet 3 with a coersive force not smaller than 3KOe, and the multiple poles composing the magnet 3 are subjected to magnetization. High efficiency is attained when the distance BH between inner and outer yokes is equal to or smaller than the line segment BD, where B, E, H, and L are the midpoints of the line segments AB, DF, GT, and KN along the magnetizing pole surface. The magnet 3 is fully magnetized radially when the distance BH is equal or smaller than the line segment CD. On the contrary, magnetizing efficiency is low when the permeance of the distance BH is smaller than that of the line segment BD.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to multipolar magnetization of a high coercive force magnet.

As is well known, radially anisotropic magnets having the shape shown in Figure 1 have been made using low coercive force alnico magnets, barium ferrite magnets, and strontium ferrite magnets, but rare earth cobalt magnets with high coercive force are used. Magnet t has not yet been made.

The reason for this is that it is difficult to make rare earth (cobal) based magnets by sintering a single cylindrical magnet.

2. Even if a thick cylindrical magnet is magnetized, the magnetization is insufficient! be.

The above cause is due to the low mechanical strength of the sintered rare earth II cobalt magnet, and the cause described later is that the coercive force iHa of the sintered rare earth magnet is 510 or more and the alnico magnet IKOe.
This is because the magnetization is higher than that of a ferrite magnet of 2.5 KOe, and the method of magnetizing a multipolar magnet with a high coercive force is irrational.

Ajiya devised a method for making thin-walled cylindrical magnets using resin-bonded ±lII':1 part type magnets. However, sufficient magnetization could not be obtained by magnetizing using the conventional multi-pole magnetization method.

The conventional method is the method shown in FIG. No. 211 shows a part of a horizontal cross section of the magnetization. 1 is Cao-Yu, 2 is line. The magnetic field generated by the copper wire passes through the space and is also applied to the magnet 5.

On the other hand, the permeability of the space is expressed by the magnetic path length of the space.In other words, the permeability of the space is expressed by the magnetic path length of the space. It gets bigger. Therefore, the space with a short magnetic path length has a high density of magnetic lines of force.When a current is passed through the copper wire 2, ABC, DIIFK
N and B poles are generated, respectively.

- The force m is dense between 09 and inert between BIC. magnet 3
is completely magnetized even between B1 when iHa is less than IKOe. In addition, in the case of a 7-engine light magnet where 1Ec changes to 2.5KOes, the magnetization is not perfect and is insufficient.

However, in rare earth cobalt magnets with 1IIa of 5KO. or more, magnetization is completely insufficient. 1! - Ri no Izumu B
, O, D, 'Excuse, If the position of the magnet corresponding to ν is expressed by the same symbol, the surface magnet density is as shown in Figure 4.
, becomes low near M. This trend is 7.9,11 for iHa
．． If it is 1510 or more, it will be original delivery and IHo will be 10!0
・In the above, B and B points are almost ◎.

As is well known, there is no actual example of multi-polar magnetization of a single cylindrical rare earth type cobalt magnet.
This is because cylindrical rare earth cobalt magnets with a size smaller than Wm were made on a whim and there was no umbrella. I was the first to manufacture a 1iIWI rare earth copper magnet using a resin bonding method, and discovered for the first time that if it was multi-pole magnetized, it would not be sufficiently magnetized by conventional methods due to K. In order to determine the magnetization matching path, the Chainman analyzed the magnetic circuit and discovered a method of multi-pole magnetization that could be sufficiently magnetized. An example of this is shown in the mS diagram.

The basis of the present invention is that the magnetic flux of magnetization is
ie touching magnetic poles (in proverb 2 diagram, C to B, D to 1)
In other words, by setting magnetization marks on the inside and outside, magnetic poles that are in contact with each other and opposite magnetic poles (from M to e and from B in Fig. 83) can be prevented. II, O to J, D or bK.

It is possible to increase the magnetization efficiency by flowing magnetic lines of force from E to r to N).

Regarding the effective scope of the present invention, reference will be made to No. 511 as an example. In Figure 3, line segments MU B, l) shi, G d.

Let the midpoints of KM be B, I, H, and L, respectively. The effect is great if the distance 11BH between the inner and outer Zugs is greater than BD. When BH≦OD, the magnet 3Fi is completely magnetized in the radial direction. When the vertical axis is the magnetic flux density in the K11 plane and the horizontal axis is the magnet local direction excitation, the result is as shown in Fig. 4.

The surface magnetic flux density distribution of the magnet becomes trapezoidal.

When K OD < BH ≦ BD, the surface magnetic flux density distribution in the circumferential direction of the magnet is expressed as II! on the vertical axis. The surface magnetic flux density becomes as shown in Fig. 5 when the snow is placed in the direction of the magnet on the - axis. Magnetic rhinoceros B
As H becomes larger than OD during l1w [at point B of 5 cabinets! ! IA becomes larger. BD is big and BD40
B゛If it shines, the tuna Figure 5 (1) The surface magnetic flux at point B approaches 0.
It has been determined from experiments and theoretical analysis that the above-mentioned tendency becomes more noticeable when 1lia reaches 5 KOs or more.

- For example, a circular magnet of 115 x -1 & 5 x 2 m is attached to the inner and outer circumferences, and the voltage SKY and the capacitor +, 4.
24-pole magnetization was performed at 00 Av. iHam7KO・
However, if BE < CD, complete magnetization can be achieved and the 4th al
t) n, aO*Ii magnetic flux was 1500,1'/tjC. On the other hand, -1 & 5 x φ & 5 x 2 ■ O cylindrical m magnet is similarly magnetized with BH > CD) The magnetization waveform is as shown in Figure 5. The surface magnetic flux at one point is 900 Gauss, while the conventional method (Outer circumference magnetization) then III! As the entire curve decreased at 111, the surface magnetic flux at KB point O was 100 Gauss.

The results of experiments using cylindrical Ws stones manufactured using magnetic powder with different iHe using the inner and outer periphery magnetization according to the present invention and the conventional outer periphery magnetization method are shown in No. 19, respectively, as the values K1 point and 0 point representing 0 magnetization performance. Noll! 0 Invention Fi using the ratio of magnetic flux (density) -
It can be seen that iHc becomes effective for 5 KO@ or more.

Table 1 In the present invention, single-pole magnetization refers to multi-pole radial direction magnetization, and the number of poles is two or more.

As can be seen from Figure S, the sBD with a small number of poles is long.
In the conventional outer periphery magnetization method, magnetization at point B becomes insufficient. The upper limit of the number of poles is 24°, 48.100 poles, etc., which can be sufficiently met by magnetization if the stone thickness BH is smaller than BD. ? 'be.

On the other hand, if fiBH>BD, which is not clear from the explanation in this bottle, the effect of the present invention will be diminished. To be more precise about this point, the effect becomes smaller when the BH part t is significantly smaller than the BD part i.

According to the present invention, magnets Fi, R2 and magnets (R: rare earth element, Y, I+a, Os'', Pr, N6.
8m, mu, G (1°Tb, Dy, He
, Ier, Tm, yb, Lu, ? :
Transition metal, Co, νe, 11. Ou, Ti,
Zr, Et, V.

Wb, Ta, Or, Mo, W, Mn, Mug, Zn,
Ofl ), Rte, magnet, R1 tema magnet, ferrite magnet, Mn-mu 10 magnet, ν@ -co -Or
-It refers to 1116>5106 or more in Ni-based magnets.

The present invention has developed an AH
The fact that the KO magnet can be magnetized with multiple poles has industrial value and will greatly contribute to the progress of industry.

[Brief explanation of drawings]

Tall is a model of the poles of a multi-pole magnetized cylindrical layer magnet.
This is what is shown. Figure 2 is a partial diagram of the outer periphery magnetization method that has been used up to now. FIG. 3 is a partial diagram of the inner/outer circumferential magnetization method according to the present invention. In Fig. 94, #15m+ represents a part of the waveform of the surface magnetic flux density of the multi-1# magnet. Author: Suwa Seikosha Co., Ltd. (1 person) Patent attorney: Tsutomu Mogami Figure 4

Claims (1)

[Claims] A facing lid multi-pole magnetization method characterized by magnetizing multi-poles by placing magnetized poles facing each other on both the inside and outside of a cylindrical magnet having a holding power of 5 KO· or more.