JPS59144352A - Multipolarly magnetized magnet for rotary electric machine - Google Patents

Abstract

PURPOSE:To obtain a multipolarized magnet of a high performance rotary electric machine by forming the surface of each pole in smooth crest shape. CONSTITUTION:An axial gap type rotary electric machine is formed of multipolarized magnet. The surface of each pole is formed in smooth crest shape by this magnet, and the actual magnetic flux density distribution of the case associated in a rotary electric machine is formed in a sinusoidal wave shape as shown. In this manner, cogging component can be reduced to zero, thereby increasing the starting torque.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a multi-pole magnetized magnet for use in rotating electric machines, such as for driving electric motors, which causes 7-lack one component,
Magnetic flux component 2 that reduces startup torque and generates coking, which has a harmful effect on the characteristics of rotating electrical machines.
This invention relates to the surface shape of a multipole magnetizing magnet for an axial gap type rotating electric field.

FIG. 1 shows the shape of a conventional multi-polar magnetized magnet for an axial gap type rotating electric machine, and FIG. 2 shows a planar developed cross-sectional view of the magnet and the distribution of surface magnetic flux density.

In FIGS. 1 and 2, the dashed lines indicate imaginary dividing lines for each magnetic pole, and the arrows indicate the direction of magnetization.

It is known that the ideal magnetization waveform required for a rotating electric machine is a sine wave shape, as shown in the curve (hereinafter referred to as the N magnetic waveform) shown in Figure 2, which represents the distribution of surface magnetic flux @ degree of a magnet. The difference between the magnetization waveform in Figure 2 and the sine wave is that the point shown is not at the center of the half-wave, but at the two shoulders on both sides. This wave is closer to a trapezoidal wave than a sine wave in that the center is lower. When the magnet r1 with this magnetized waveform is used, for example, in a core type electric motor, the raised portions on both shoulders of the magnetized waveform act as a braking torque in the opposite direction to the rotational movement of the rotor. This causes cogging 2, an increase in the 7-sinter component, and a decrease in starting torque. In order to create a curved sine wave shape that is close to a trapezoid, the magnetizing magnetic field should be suppressed to a level that does not saturate the magnet, and the shape of the magnetizing yoke should be devised. It is possible if you do. However, according to this method, eyebrow a
Sometimes it is not possible to apply a sufficient magnetic field, so we have to make custom-made magnets.
This means that it will not be possible to produce a sufficiently well-made product, and therefore, a custom-made electric motor will not be able to be made sufficiently.

In order to solve these drawbacks, the present invention has the surface of each magnetic pole part of the magnet in a gentle mountain shape, and in addition to the magnetization field sufficient to fully bring out the customization of the magnet, the magnet is fully saturated. Even if the core blade is facing the magnet in the rotating electric machine B3), the magnetic flux @ degree distribution will have a sinusoidal shape, and the rotating cage with more general performance can be created. It provides a magnet.

Next, we will explain the characteristic of non-invention '@'.

In general, when calculating the harmeance coefficient e at the operating point of a magnet used in a rotating electric machine, etc., it is necessary to calculate the following: magnet cross-sectional area, magnet length, thickness), sky 111! The cross section, gap length, and r are each calculated by placing them in an equivalent magnetic circuit. Therefore, this method will be used here as well, and consideration will be given based on the equivalent circuit shown in FIG.

In FIG. 6, Affl is the constant moving magnet cross-sectional area, μm is the equivalent magnet length, 81 is the equivalent air gap cross section, and λ2 is the equivalent air gap length. Further, 1 is a magnet, a core facing the 2V:L magnet, and 3 is a bank yoke. In the case of Fig. 6, the permeance coefficient at the operating point of the magnet is expressed by the following formula. Where is the thickness of the magnet? By changing the length of the void? If we perform an operation that changes the same dimension, Al' and Am do not change in equation (1) and can be treated as constants, so At'/'A
If we put m=C and rewrite (1) 2, we get How thick is a magnet like this? By changing the air gap width at the same time, the permeance coefficient at the operating point of the minute magnet in each magnetic pole section can be slid. It can be changed continuously into a sword. Therefore, according to this method, a magnetizing magnetic field large enough to fully saturate the magnet can be applied, making full use of the characteristic sound of the magnet, and producing a trapezoidal crushing waveform that is useful for rotating electric machines. Therefore, it is possible to obtain a smooth sinusoidal waveform of magnetization.

For example, in equation (2), if by changing n rn k from 2.5 to 2.3, and at the same time ℃v changes from 0.5 to 0.7, the permeance at the operating point of the magnet The coefficient changes at the following ratio:

=0.65'7 Here, k, if'1 is the permeance coefficient at the operating point of the magnet before the dimensional change, and k2 is the permeance coefficient at the operating point of the magnet after the dimensional change. In reality, it is possible to apply Hoko's Keisongo method according to the shape and size of each magnet and rotating electrical machine.

A concrete example of the contents explained above is shown in FIGS. 4 and 5. FIG. 6 shows a semi-expanded sectional view of each magnet and the distribution of magnetic flux tightness seen from Table 1fD of the core facing the magnet. In FIGS. 4 to 6, the broken lines represent imaginary dividing lines for each magnetic pole, and the arrows indicate the direction of magnetization. Also, the fourth
The magnets shown in Figures 1 and 5 may be placed with two-direction enclosures on either side, the upper side or the city side. Figures 4 and 5 are examples of cases where N and b6 poles are used, respectively, but in general when using N and S2n (n = 1°2, ...) ytrm, It is applicable.

As explained above, if the uninvented magnet shape in which the surface of each magnetic pole forms two gently sloping chevrons is used, the practical magnetic flux density distribution when incorporated into a rotating electrical machine can be customized. fully raw 7
Since it is possible to form a smooth sinusoidal wave with 1λ, the cogging component can be reduced to 1, which is essentially zero, without impairing the various characteristics of the rotating electrical machine.Therefore, it is possible to reduce the flutter component and improve the starting torque. ■7J11. ADゐIt has a significant effect on reducing power consumption, etc. In addition, in general, axial gap type rotating electric machines are often made of coreless type because the cogging is too large, but if the magnet r according to the invention is used, it becomes M iron core type structure. You can plan to use it.

Therefore, when using the multi-pole magnetized magnet of the present invention in a shape where the surface of each @ pole forms a gentle chevron shape, it is possible to use a brushed magnet,
It can be used for planless, large, and small motors, such as floor desks, etc., and is ideal for completely improving the characteristics of motors of all sizes. If used in an all-magnetic generator, a clean sinusoidal generated voltage can be obtained, and there is also the effect that the generated voltage waveform can be used at an M profit.

Similarly, in order to manufacture the magnet having the shape of the present invention, it is optimal to use the injection molding method in terms of the degree of freedom of the shape, etc. However, there are other methods such as the cutting method, the sintering method, The blade λ1v may be produced by a compression molding method or the like, or by a combination of these methods.

[Brief explanation of drawings]

Fig. 1 shows a typical shape of a conventional multi-polar layer magnet for electric motors, Fig. 2 shows a flat developed cross-sectional view of the magnet shown in Fig. 1,
A curve representing the distribution state of the surface magnetic flux density of a magnet. Figure 6 is a reference diagram of an equivalent magnetic circuit for calculating the permeance coefficient at the operating point of a magnet in a general electric motor. Figures 4 and 5
The figure shows an example of a magnet shape with an inventive gentle mountain-shaped magnetic pole surface shape. FIG. 6 is a planar developed cross-sectional view of the magnet shown in FIG. 4 and a curve representing the distribution state of the magnetic flux when the magnetic flux density of the magnet is measured with core soil facing across an air gap. The arrows in each figure indicate the magnetization direction of the magnetic poles, and the dents indicate the imaginary dividing edge of the %m pole. 1...etc. 1-curve magnet 2...core facing across an equivalent air gap 6...bank yoke or more ~239- Figure 4 Figure 5 Figure 6 Procedure refocusing shop (method) Displaying 1 item per monthLiRW58 Years of Application No. 1485252 Name of the invention Multipolar magnetized magnet for rotating military aircraft 3 Person making the correction Relationship with IU, O2, Chuo-ku, Tokyo Ginza 4-6-4 (256
) Veterinary company Suwa Seikosha representative officer Tsuneya Nakamura 4th generation chef 5 Specification with [Yo] of the amendment order 8, Contents of the amendment Procedure amendment (method) as shown in the attached sheet 1, Specification 7 Second line from Sada ~8 negative 1st line''6th
The figure is a reference diagram of an equivalent magnetic circuit for calculating the permeance coefficient at the operating point of a magnet in a typical electric motor. ``Diagram 3 is a diagram showing the equivalent magnetic circuit for obtaining all 9 permeance coefficients at the operating point of the magnet for a general 3-way machine.''
Correct to. The above-mentioned agent's duties

Claims (1)

[Claims] A seventh feature of the multi-pole magnetized magnet for use in an axial gap type rotating electrical machine is that the surface of each pole 1a has a sloping chevron shape r.