JPS5928868A - Permanent magnet type dc electric machine - Google Patents

Abstract

PURPOSE:To reduce the leakage magnetic flux of a DC electric machine and to improve the rotary torque of the machine by contacting adjacent two poles at the radial inside of the poles and forming a leakage magnetic path interrupting air gap at least in any of both poles. CONSTITUTION:A permanent magnet 2 is cut at the end on a radiation line expanding in a sector shape from an axial center 0, an auxiliary pole 3 formed of a core is disposed at the side for generating a reduced magnetic field by magnetic reaction, and secured intimately to the part of the side of the magnet 2. In order to stop a magnetic flux leaked to the auxiliary pole at the radial center of the magnet peculiar for the anisotropic magnet as a boundary, a leakage magnetic path interrupting air gap 4 is formed. This air gap 4 is formed by cutting the outside of a line segment which passes the point of 1/2H width of the magnet in parallel with the central line which connects the center 0 of the rotational shaft to the center of rotating direction of the permanent magnet on the magnet 2 cut on the radiation line at both end surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a permanent magnet type 1u floating rock, in particular, a permanent magnet used for all main poles of an anisotropic peeking permanent magnet and having a field formed by arranging auxiliary magnetic poles in parallel to the main pole. Regarding magnetic iM Nagaiso.

Conventionally known permanent magnet type DC machines such as scooters are described, for example, in Publication No. 48-35721.
? Ifl Ikuko As a countermeasure against demagnetization caused by the anti-Ikumo reaction, a commutating pole is provided on the demagnetization side.

In other words, a magnet with +1q is formed by a heterogeneous permanent magnet (main magnetic pole) with both ends cut in ψ parallel to the center line extending radially from the rotor center, and an auxiliary magnetic pole (iron core) adjacent to this magnet with an air gap. Alternatively, there is one in which the opposing surfaces of the main magnetic pole and auxiliary magnetic pole are closely contacted over the entire surface to form a 4'l'l'.
As is well known, the magnetic flux passes through the anisotropic permanent magnet e in the radial direction, so if the auxiliary magnetic poles are closely placed side by side in the direction of rotation, there will be no leakage between them! 3φ.

is formed. Therefore, in the latter case, the effective magnetic flux decreases, resulting in a decrease in rotational torque. -If you are a man, +J+
Although the leakage magnetic flux decreases, both values are high in the waveform due to the magnetic flux seen from armature 1++ll as shown by the dotted line in Figure 5 (a) because there is a gap over the entire length between them. ′
+, At 67j, there is a steep drop between the two,
Smooth operation cannot be expected, and the output power decreases and magnetic ■ occurs.
fAi! +71J is generated. By the way, the above output decrease is 0
．． With an 8kW starter, the output will be reduced by about 5 equivalents.

The object of the present invention is that the magnetic flux distribution waveform is smooth at t'+t, and the rotation l
・It is necessary to provide a water-cooled magnet-type IU flow machine.

The present invention is based on a solid bonnet having a main pole made of an anisotropic permanent magnet arranged on the inner circumference 1141 of the yoke, and a 4iM auxiliary pole arranged in parallel on the demagnetizing side of the permanent magnet I. In the permanent magnet type straight machine, the two adjacent magnetic poles (i) are in contact with each other on the radial inner side of the pole, and a leakage magnetic path a-cutting gap is formed in at least one of the two magnetic poles. This makes it possible to reduce leakage magnetic flux and improve rotational torque.

Embodiments of the present invention will be explained below based on the drawings.

FIG. 1 shows a case where a permanent magnet type direct current is used as a starter, and the motor section will be mainly explained. In the figure, four circular arc-shaped anisotropic permanent magnets 2 are arranged on the inner circumferential surface 1a of the yoke 1, and are fixed with adhesive. This eternity (1 stone C1 as shown in Figure 2, spread out in a fan-like manner from the axis 0 and 7 rays) 2 = 911j surface + hJ
7, and a fili auxiliary pole 3 made of an iron core is placed on the side where a demagnetizing field is generated due to magnetic reaction. 4 is the leakage magnetic b16 shield 1vi beam gap, anisotropic magnet f)
The radial center of the magnet with & is formed to further prevent magnetic flux from leaking to the auxiliary magnetic pole. This nitrogen gap group is drawn parallel to the center line connecting the center O of the rotating shaft and the center in the rotational direction of the permanent magnet on the permanent magnet 2 which has been cut on the radiation line, and has a width of 1/2 H of the magnet. It is formed by canting the outer l1 (11) of the line segment passing through point r.

In other words, the neutral point e of the N and S poles of the permanent magnet 2 is 1/211
If the magnetic flux is reached to the minimum neutral point (at the J point), the leakage of magnetic flux can be stopped by 11 MI, and the rotational torque can also be increased by 3 to 5%.

On the other hand, the relationship between the pole enclosures will be explained with reference to FIG. The above embodiment is a so-called 4-volume system. do/〔
Therefore, the angle θ that combines the permanent Ill and the auxiliary pole 3) is approximately 70° (= near J, which is similar to a general rotating machine).

-11 self-pole encloners become magnetized (& (D i'Jlli k IMj (!l Rb
t rJ, increase -1-power, 11 iit VC Oite electric ttQ is susceptible to the shadow of the slope magnetic field of the child reaction (2141), and the demagnetization rate is not high, so performance can be improved.
/''1o For this reason, even with anisotropic ferrite magnets, increasing the size of the pole enclosure is ineffective, and reducing the amount of money spent on magnets is economically advantageous.
It is about 8. Therefore, in order to increase the effective magnetic flux within this range, it is most effective to block the leakage magnetic path as described in Section 1.2.

As described above, if the inner diameter side of the anisotropic permanent magnet is 841 mm, the outer diameter side is the N pole, and the center of the thickness of the permanent magnet is the neutral point where no polarity occurs.

Therefore, as shown in Figs. 1 and 2, the magnetic circuit through which the main magnetic flux passes is formed as follows: permanent magnet 2 -> Ichibarako A -> air gap 21 -> auxiliary magnetic pole 3 -> yoke 1 -> permanent magnet 2. And the forward-curved magnetic pole: The side surface in contact with the back should be as far as possible below the neutral point of permanent magnet 2, and its tip should be in the air gap with the armature. , in order to create a larger gap between the beams, there is a permanent a) parallel plane that is cut by the radiation passing through the center of the magnetic flux and the plane r1 at the outer peripheral corner of the 8 stones, so that a wider space is created. By setting up a permanent stone, thinning from the first part of the stone has been completely reduced.

Above 1, the cutting IQ of the space must be parallel to the ray, which passes through the center of the magnetic flux.When molding ferrite powder with a mold, the punching direction is constant and greatly contributes to production 1 (L).

Next, the product of the present invention and the conventional product will be compared and explained with reference to FIGS. 4 and 5.

Fig. 4 (b) shows a permanent (a-stone 2 and auxiliary magnetic pole 3) whose opposing surfaces on the inner periphery are bonded together to form a leakage magnetic path gap 4 on the outer diameter. The observed magnetic flux distribution is the auxiliary magnetic pole 31
11 to the main magnetic pole 2, the effective magnetic flux is increased within the limited magnetic pole width, and magnetic flux is generated.
It is also effective against vibrations.

On the other hand, as shown in Figure 45 (11), the above d] Example and I
J, I am considering making it a reverse taper and butting it at the outer periphery 7
In this case, as shown in Fig. 51 (in magnetic flux distribution waveform (solid line)), there is a part where I becomes close to 0, and rotational torque, magnetic +4, and vibration are not improved. !141 K, there will be a part where the magnetic pole does not oppose the body part.
; j, As shown by the dotted line, the one with a borrowed time on the principal amount is small, but it is preferable, i, f
Yes.

According to an embodiment of the present invention (if the leakage magnetic path is effectively blocked, I
In order to cut 'r'c, there is a permanent magnet within the iijΣ4 of the JM defined ball-rule-Ln' clone, tili auxiliary angle A3
With the minimum shape tic L, it can be effectively arranged and the one-turn torque can be increased by about 5X while maintaining the current structure. In addition, since the magnetic flux distribution is smooth, magnetic imaging is suppressed and a bale with less noise can be obtained.

FIG. 6d shows an embodiment of the box of the present invention, in which the joint surface G11l of the permanent magnet 21 is formed by removing the taper toward the tip of the magnet with the 'f+ti auxiliary magnet 31. Magnetic path blocker sky 1! /! 43, this combination can also effectively eliminate leakage.

In another embodiment of FIG. 7, the gap 42 is
In this case, the 911j of 22 is radiation i + J5! 1 formed on the lino along the top j'L
-C, the auxiliary magnetic pole side facing it is removed in a circular shape, but it is made of iron such as soft iron./It can be easily shaped to resemble the tangential surface, and the depression of the tangential surface can be freely controlled. There are advantages.

In this way, the secondary magnetic leakage path is cut off ()1tan'', the main magnetic heron, and the previous song (
-Put either one of the poles into 1. Although it is formed by dividing A, the same effect can be obtained in the case of L.

4th '-An*Example Vma permanent magnet 23. A chair with 33 auxiliary magnetic poles! Even a notch? i: Provided with an inner diameter of 111 tl
The air gap 43 is formed by poking it in with a gold tooth in this case as well. )1j There is an advantage that the auxiliary pole can be formed freely.

As described above, according to the present invention, the magnetic flux distribution waveform t(
r'i7 Easy and one-turn torque dog-sai permanent imite stone straight b
1 (I can submit 0゜ drawing box 1i II Shea Akira 1st;
Gather bales] 14L/This starter's IJ! ? 'it to el
: Itj [Song chart, Figure 2 is part 11 of Figure 1]
11 diagram, Figure 3 is a summer type direct bM, Toshi of time, viewed from the dumpling side / Direct east distribution map and IIjl construction map of magnetic poles, Figure 5 (a) (n) fri LE coming'', 7Ll Ushito viewed from Ichi Shinko 1111 at high load The distribution 1ka and Iichiyama's <tQ diagrams, FIGS. 6 to 8, do not show the separation between the permanent magnet and the precurved magnet 1 in other embodiments, but the part 1 is 1.

1...Yon; Iron, 2...Permanent magnet (main magnet Gai), 3...
・Maesuke magnetic condolence 2 Zukan 6 Figure 17 Rei 8

Claims (1)

[Claims] 1. A main pole made of a four-sided permanent magnet (disposed on the inner circumferential surface of the yoke) and a main pole made of a four-sided permanent magnet are arranged in parallel with 5A contact on the demagnetizing side of the permanent magnet. In this permanent magnet type 1a flow machine consisting of a stator equipped with auxiliary magnetic poles, the two adjacent magnetic poles are in contact with each other on the inside in the radial direction of the magnetic poles, and there is a leakage magnetic path distribution gap on the outside in the radial direction. The whole division has been formed! Permanent magnet type DC machine with P symbol. 2. Paragraph 1 of the +l+α enclosure of the patent ll1v request,
A permanent magnet direct current magnet characterized in that the two magnetic poles are in contact with each other at a radius of 111 degrees of rotation from the center. 3.l) Gate The permanent magnet according to claim 1, characterized in that the leakage magnetic path a-cutting gap is formed at an outer side 11 from the center position of both magnetic poles in the radial direction. Type DC machine. 4. lpy yF Claim 3,
A permanent magnet type IM flow machine characterized in that a gap V is formed at an outer peripheral corner of a main magnetic pole, and a cut surface of the corner is parallel to a radiation passing through the center of the main magnetic pole.