JPH0429537A - Permanent magnet type rotor - Google Patents

Abstract

PURPOSE:To improve torque characteristics of a hybrid step motor by arranging n pieces of N poles and n pieces of S poles alternately on the outer circumference thereby increasing flux of the permanent magnet in a rotor interlinking with a stator winding. CONSTITUTION:Tooth section 3'-1 of an auxiliary magnetic piece 3A is fitted to the pole tooth section 3-1 of a rotor R so that they have same central part in the direction of tooth width, and then resin is injected into the inner diameter part of the auxiliary piece 3A and the outer circumferential part of the rotor R. If the coupling part L of the auxiliary piece 3A has narrow width under this state, it is magnetically saturated by a permanent magnet 5 thus magnetizing one tooth sections 3'-1, 3'-2, 3'-3, 3'-4, 3'-5 of the auxiliary piece 3A with N polarity whereas magnetizing the other tooth sections 3'-6, 3'-7, 3'-8, 3'-9, 3'-10 with S polarity. Furthermore, outer circumference of the auxiliary piece 3A is cut off with reference to the center of a rotor shaft 6 and then the coupling section L is cut off. Consequently, magnetic leakage at the coupling section L is eliminated resulting in a high torque step motor where the rotor has alternating N and S poles.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a permanent magnet rotor equipped with permanent magnets, particularly to an improvement of a permanent magnet rotor suitable for application to a permanent magnet stepping motor. .

[Prior Art] FIG. 14 is an example of a conventionally well-known permanent magnet stepping motor, and is a perspective view showing the structure of the rotor and stator with a part of the stator cut away.

For ease of explanation, each magnetic pole of the stator S is 1-1.
There are four poles, 1-2.1-3.1-4, and in one drawing, the magnetic pole 1-2 is shown cut away.

Note that each stator magnetic pole has 2-1.2-2.2-3.
An excitation coil 2-4 is wound.

R is a rotor, - five pole teeth 3-1 to 3-5 on the water side;
and five pole teeth 3 on the other side with the permanent magnet 5 in between.
A pair of gear-shaped pieces 3.3° forming -6 to 3-10
However, one piece, for example piece 3, has teeth of 17
It is arranged to be shifted from the pole teeth of the other piece 3 by 2 pitches (36° in this case).

Since the permanent magnet 5 is magnetized to 211i in the direction of the output rotating shaft 6, for example, the pole teeth 3-1 to 3-5 are N@.

Pole teeth 3-6 to 3-10 are Sf! is magnetized.

Reference numeral 7 denotes an elliptical body made of a magnetic or non-magnetic material, which is normally provided to hold the front and rear brackets that support the bearing 6 in order to keep the gap 4 between the stator S and the rotor R uniform.

Next, the principle of rotation of the single rotor R will be explained with reference to FIGS.

In the same figure (A), a current flows through the coils 2-1 and 2-3, the magnetic pole 1-1 is magnetized to the S pole, and the magnetic pole 1-3 is magnetized to the N pole. is attracted, and the pole teeth 3-8 are magnetic pole 1.
-3 shows the state where it is attracted and stopped.

Next, the current in coil 2-1, 2-3 is cut off, and coil 2-
When a current flows through 2°2-4, the magnetic pole 1-2 and the pole tooth 3-2 are attracted in the state shown in the figure (A), and the magnetic pole 1-4 and the pole tooth 3-9 are attracted, respectively. (b) and stops.

In other words, the angle 174 between the pole teeth 3-1 and 3-2 is 1
It moves at a step angle.

Next, in the state shown in Figure (B), the current in coils 2-2 and 2-4 is cut off, and current flows through coils 2-2 and 2-3 in the opposite direction to that in Figure (A). Then, the rotor moves one step angle to the right and stops in the state shown in FIG.

Similarly, if the current in coil 2-1.2-3 is cut off in the state shown in the same figure (c), and the current is passed through coil 2-2, 2-4 in the opposite direction to that in the same figure (b), the same result will be obtained. It moves one step angle to the state shown in figure (d) and stops.

The principle of rotation of a stepping motor is that the rotor moves one step angle at a time in this manner.

One point to note is that, for example, in the state shown in Figure (A), the pole tooth 3-1 is not 100% opposed to the laminated thickness of the stator magnetic pole 1-1 in the direction of the output shaft 6; The point is that the relationship is only about 40% of the opposing positions.

Similarly, the pole tooth 3-8 in FIG. 15(a) is the magnetic pole 1-3.
The facing relationship is also about 40% of the stacking thickness (this ratio is
(depending on the thickness).

[Problem to be Solved by the Invention] The problem to be solved by the present invention is to change the ratio of the opposing positions of 1itifi on the stator side and rotor side shown in FIG. 14 or 15 to Nfi.
, S[! The objective is to obtain high torque by making the torque almost 100%.

In order to solve this problem, there is a technique shown in FIGS. 16 and 17 as a prior art that is an improvement on the conventional technique.

In FIG. 16, 8 is a permanent magnet 9 with bipolar magnetization formed by punching out a magnetic iron plate into the shape of a chrysanthemum petal using a press or the like and bending the teeth.

The output shaft 10 is passed through it, and FIG. 17 shows its completed form.

In this prior art, as can be seen from FIG. 17, the rotor magnetic poles alternate between north and south poles, but there was a first-order problem.

■If you try to increase the thickness in the direction of the output shaft 10 to achieve high torque, the tooth 8 will be punched out with a press, and since there is a bending process, the accuracy of the tooth arrangement after one bend will be poor, and the step angle accuracy of the stepping motor will also be affected. to degrade.

■When trying to make a motor with a minute step angle, 1 of teeth 8
In the first model, the chrysanthemum petals are wire-like and the accuracy is l.
It is also difficult to produce the desired amount of light.

For this reason, this prior art has not been implemented and the above-mentioned conventional examples have continued to be used, and a solution to the above problems has been sought.

SUMMARY OF THE INVENTION An object of the present invention is to provide a permanent magnet rotor suitable for use in a stepping motor, which solves the above-mentioned problems of the conventional motor.

[Means for Solving the Problems] A rotor equipped with a permanent magnet of the present invention is fitted with the outer periphery of the rotor using an auxiliary piece in the form of an internal gear made of a magnetic material having twice the number of teeth on the inner diameter side. A single internal gear-like housing is fitted to the rotor, the tooth width is approximately the same as the rotor tooth width, and the portion connecting the teeth, which is twice the inner diameter, is made as small as possible. At this time, the centers of the mutual tooth widths are made to coincide with each other, and they are fixed by resin casting or the like.

In this case, plastic resin is injected and fixed into the teeth of the internal gear-like auxiliary piece, the teeth of the hybrid rotor into which it is fitted, the outer periphery of the permanent magnet, etc. When the connecting part of the iron yoke with teeth is cut off concentrically around the rotor axis center and the rotor is magnetized in the rotor axis direction, n pieces of N
It is preferable to use a permanent magnet type rotor in which poles and n S& are arranged alternately on the outer circumference. However, n is a positive integer of 2 or more.

In addition, a plastic magnet is injection molded or a solid magnet is pushed into each tooth groove of the 2n tooth portions of the auxiliary piece to claim 2.
The magnets in the tooth grooves are magnetized so that the magnets in the tooth grooves on both sides of the n N poles face the N pole, and the magnets in the tooth grooves on both sides of the n SI face the S pole. It is desirable to use a permanent magnet type rotor that prevents leakage magnetic flux between N poles and S poles arranged alternately on the outer periphery of the hybrid rotor.
Further, an internal gear-like object having 2n teeth is provided with a thickness approximately equal to the thickness of the hybrid permanent magnet, and is installed concentrically around the outer periphery of the hybrid permanent magnet, and A gear-like object with the same dimensions and material, but with n teeth at intervals, is provided and arranged concentrically so that it is in the center of the n tooth spaces of each of the two hybrid rotors. , its thickness is almost the same as the thickness of the hybrid rotor teeth, and the teeth are in contact with the 2n internal gear-like objects mentioned above, and the teeth have 2n internal gear-like teeth in the direction of the output shaft and on the left and right sides thereof. Make sure that the arranged n internal gear teeth are in a straight line, and after casting and fixing resin casting or plastic magnets, output the joint yoke part of the outer periphery of the internal gear shaped objects for n and 2n pieces. It can also be a permanent magnet rotor with a cutout concentric to the shaft.

In addition, after gluing a plastic magnet or permanent magnet to the tooth groove of the above-mentioned piece made of magnetic material with 2n teeth whose outer or inner periphery is connected, cut the yoke portion of the connected outer or inner periphery. A permanent magnet type rotor in which a ring-shaped body is formed by alternately arranging 2n magnetic material parts such as drop irons and permanent magnet parts, and is magnetized as described above and fitted to the outer periphery of a hybrid rotor. It can be a child.

Furthermore, n pieces of high-permeability magnetic material such as iron and n pieces of permanent magnets were arranged alternately to form a ring shape, and the outer and inner peripheries were joined together to form a perfect circle. In a ring-shaped object, two of these n permanent magnets magnetized with the same polarity in the radial direction are placed at a predetermined interval so that the output shaft is at the center of the inner circle of the ring. Attach a disk-shaped yoke with two center holes to the output shaft so that it fits into the inner circle of these two rings, and then connect the two rings so that it is sandwiched between these two disks. A permanent magnet having approximately the same dimensions as the disk-shaped yoke, a slightly smaller outer diameter, and a thickness approximately equal to the predetermined interval, magnetized into two poles in the direction of the output shaft, and the permanent magnet of the two ring-shaped objects The radial direction magnetization of the two magnets is in opposite directions, and a ring-shaped object with a permanent magnet whose outer periphery is magnetized to the S pole is fitted to the disk-shaped yoke of N11l, which is magnetized twice. The outer periphery of a ring-shaped object with permanent magnets is arranged with a N pole, and the permanent magnet parts exposed on the outer periphery of the ring-shaped objects are arranged with a pitch offset of 172. It can be a magnet type rotor.

Furthermore, a permanent magnet type rotor may be used in which n high permeability magnetic material parts such as iron sandwiching n permanent magnets are connected at the inner circular part of the ring-shaped object.

In addition, n teeth formed on two gear-like pieces are 17
If the pitch is not deviated by 2 pitches, insert an auxiliary piece made of silicon steel sheet into the 3rd pitch corresponding to the thickness of the permanent magnet of the hybrid rotor.
A permanent magnet rotor may be used, which is skewed by 60°/2n and stacked on straights 1 on both sides outside the skid area.

[Example] The present invention will be specifically described below with reference to the first to eighth examples shown in FIGS. 1 to 13.

In each figure, refinements corresponding to conventional ones are designated by the same reference numerals as in FIGS. 14 and 15.

Figures 1 (a) and (b) show a first embodiment showing the basic refinement of the present invention. °-1~3°-10
Auxiliary piece 3 made of magnetic material and having teeth shown in
A is formed, arranged so as to correspond to the magnetic pole portion of the permanent magnet type rotor R shown in FIG. 14, for example, and integrated by covering the outer periphery to form a two-rotor.

In this case, the number of pole teeth provided on the inner diameter side is the rotor R in Fig. 14.
The number should be twice that of the N-pole side or S-pole side (number of pole pairs), and the tooth widths should be approximately equal.

The inner diameter thereof is approximately equal to the outer diameter of the rotor shown in FIG. 14, and is designed to fit with the smallest possible gap.

The auxiliary piece 3A can be formed by punching silicon steel plates with a press and stacking them, and the width of the teeth is generally approximately equal to the thickness of the steel plate, so the width of the teeth can be up to about 0.25111 m, and therefore the number of teeth can be increased.

Although it depends on the outer diameter of the rotor, it can be sufficiently applied to a stepping motor with an outer diameter of about 301 and a step angle of about 1.8° (number of pole pairs: 50).

Note that the dimensions of the connecting portion of the auxiliary piece 3A are made as small as possible to facilitate magnetic saturation.

Further, FIG. 4 is a developed view showing the arrangement of the rotor and stator of this embodiment.

FIG. 2 shows a second embodiment of the present invention, in which the auxiliary piece 3A shown in FIG. 1 is placed over the outer periphery of the rotor R shown in FIG. After fitting the pole teeth 3-1 of the rotor R so that the center portions of the tooth widths are the same, resin is injected into the inner diameter portion of the auxiliary piece 3A and the outer circumferential portion of the rotor R.

It is designed to be fixed.

In this state, the width of the connecting part of the auxiliary piece 3A is narrow, and it is magnetically saturated by the magnetic force of the permanent magnet 5, and the outer circumference of the auxiliary piece 3A is N.
%, if an S pole occurs, the rotor shown in FIG. 2 can be used in place of the rotor R shown in FIG. 14 as is.

However, at this time, it is necessary to review the overall dimensions of the stator rotor so that the air gap 4 can be maintained appropriately.

In Fig. 2, one toothed portion 3°-1 of the auxiliary piece 3A
, 3'-2, 3°-3, 3'-4, 3°-5 are magnetized, for example, N'IIM, and the other teeth 3°-6, 3''7.
Since the teeth of 3°83"-93°-10 are in opposing contact with 3-6 to 3-10, they are magnetized to the S pole as shown in the front view of Figure 2 (A) and the same figure ( This can be understood by referring to the side view of b).

Furthermore, if the outer periphery of the auxiliary piece 3A is cut based on the center of the rotor shaft 6 as shown in Fig. 2, and the connecting portion is removed, magnetic leakage due to the connecting portion will be eliminated, and rotation with alternating magnetic poles N and S will be achieved. A child can realize it.

If an appropriate air gap 4 is secured and the rotor is used in place of the rotor shown in FIG. 14, a high-torque stepping motor can be manufactured.

Figures 3 (a) and 3 (b) show a third embodiment of the present invention. In order to eliminate leakage between N and 3 of the alternating magnetic poles, permanent magnets or plastic magnet 1
If 2-1 to 12-10 are inserted (injected) and magnetized as shown in the same figure, 2 are fitted into the rotor shown in Fig. 14 as in the second embodiment, and adhesive or resin injection is applied to the rotor. The pole teeth 3-1 can be fixed in the gap between them, and if the outer periphery shown in Figure 3 is cut based on the center of the rotor shaft 6 and the connecting part is removed, powerful, high-torque stepping without leakage can be achieved. A motor or permanent magnet synchronous motor is realized.

Figure 5 is a developed view of the main parts to explain the action of the magnet placed in the tooth groove shown in Figure 3, and Figure 5 (a) shows the case where the permanent magnet shown in Figure 2 is not used properly. Leakage magnetic flux φ1 is generated,
The main magnetic flux φ passing through the air gap contributes to the torque. becomes easier to decrease.

On the other hand, FIG. 5 (b) explains the effect of FIG. 3, in which the leakage magnetic flux φ1 disappears and the magnetic flux φ due to the new magnet installed at the base is added to φ9, resulting in φ and 1φ.

This shows that high torque can be obtained because it contributes to torque as a linkage magnet.

The present invention is actually effective and industrially valuable when applied to a hybrid stepping motor with a minute step angle. The number of teeth of 3A is 50) and the step angle is 3.6°.

In this case, the outer periphery of the auxiliary piece 3A is cut and the connecting portion is removed.

In addition, as shown in FIG. 14 in the rotor of a hybrid type steering motor, N8i! and S pole is 17
There are some cases where the stator is not shifted by 2 pitches, but in this case, the rotor S is
The part facing the pole is shifted by 1/2 Bi-Sochi.

An example of applying the present invention to such a stepping motor is shown in FIG. 8, and FIG. 7 shows a case where the N and S poles of one rotor are shifted by 172 pitches.

Figures 7 and 8 are views viewed from above the outer periphery of the rotor from the direction of the air gap, and each figure (a) shows the case where the present invention is not applied, and the same figure (b) shows the case where the present invention is applied and the auxiliary This shows the case where the connecting portion on the outer periphery of piece 3A is removed.

In other words, if the N and S poles of the hybrid rotor are not shifted by 172 pitches, the teeth of the auxiliary piece 3A correspond to the thick part of the permanent magnet of the hybrid rotor, as shown in Figure 8 (b). In other words, in FIG. 14, only the thickness of the toothless permanent magnet 5 between pole teeth 3-1 to 3-5 and pole teeth 3-6 to 3-10 is skewed by 180°/(number of pole pairs). The effects of the present invention can be obtained by stacking straight layers at both ends outside the skewed portion.

FIG. 9 shows a fourth embodiment of the present invention.

The same figure (A) shows an auxiliary piece 3 that is the same size and material as the internal gear having 2n teeth described above, and has n teeth at equal pitches.
Pole teeth 3"-1 to 3 degrees formed to increase the height of each of the pole teeth of the rotor to the extent that they almost touch the inner circumferential circle of B.
'-10 are provided and arranged in combination 172 pitches apart from each other as shown in the figure, and the thickness in the output axis direction is 3°°-1~
The internal gear-like auxiliary piece 3A having the same 2n teeth as 3--5 or 3°°-6 to 3''-10 is a hybrid permanent magnet 5 as shown in FIG. 9(b). The auxiliary piece 3A is in contact with the other auxiliary piece 3B on both sides, and the teeth are each linear in the direction of the output shaft 6. After casting or fixing the plastic magnet.

The same effects as in the embodiments described above can also be achieved by cutting off the connecting portions of the yokes of the auxiliary pieces 3B and 3A so that they are concentric with the output shaft 6.

FIG. 10 shows a fifth embodiment of the present invention, and FIG.
In the embodiments shown in (a) and (b), if the binding force of the plastic permanent magnets 12-1 to 12-10 is sufficient, the outer yoke connecting portion is Cut off and divide it into 3-1 to 3-5 and 3-6 to 3-
10.

FIG. 11 shows a sixth embodiment of the present invention. Specifically, the tooth portions 3-1 to 3-10 in FIG.
(12-1 to 12-5 >) Similarly, half the number of plastic magnets or solid permanent magnets 12-1 to 12-5 are glued together to form a ring, and the outer peripheries of these permanent magnets are of the same polarity in the radial direction. It is magnetized so that

FIG. 12 shows a seventh embodiment of the present invention.

Figures (a) and (b) show the structure of the rotor, with (a) being a cross-sectional front view and (b) being a side view.

These n ring-shaped iron core parts 3-1 to 3-5; 3-6
〜3-10 and n permanent magnet parts (shown in the case of plastic magnets) 12-1〜12-5.12-6〜12-1
Arrange a pair of Tl-connected 0's alternately with a predetermined distance l apart so that the output shaft is at the center of the inner circle of the ring, and fit into the inner circle of the two rings. A disk-shaped yoke 14.15 with two center holes is attached to the output shaft 6 as shown in FIG. Same dimensions but slightly smaller outer diameter and thickness! A permanent magnet 13 magnetized with two poles in the direction of the output axis is arranged to be approximately equal to 14 also has a ring-shaped object having permanent magnet parts 12-1 to 12-5 whose outer periphery is magnetized to the S pole. The outer periphery of the ring-shaped object having the permanent magnet parts 12-6 to 12-10 that fits into the disk-shaped yoke 15 on the S side is arranged to serve as a north pole, and the outer periphery of the ring-shaped objects is exposed. This figure shows a rotor in which the permanent magnet parts are arranged 172 pitches apart from each other.

Even in this configuration, the outer circumferential portion of the rotor facing the stator has N and S poles alternately, and the same effects as in the above embodiments can be expected.

In the case of this embodiment, the ring-shaped object on the outer periphery of the rotor cannot face the stator due to the thickness of the permanent magnet 13 of the hybrid rotor. This embodiment is suitable for such cases.

Further, FIG. 13 shows an eighth embodiment of the present invention, in which the inner peripheral portion is deformed so that 3-1 to 3-5 and 3-6 to 3-10 are connected. Even if the configuration is configured as shown in FIG.

[Operation] Generally, the maximum static torque T of a permanent magnet stepping motor is expressed as T″pmφ,i (1).

Here, p is the number of magnetic pole pairs, 1 m is the number of coil turns, and φ.

is the magnetic flux linkage with the permanent magnet coil, and i is the excitation ti.

As mentioned above, in the permanent magnet type rotor of the present invention, the facing area of the stator S and rotor R is doubled.

If the magnetic flux of the permanent magnet is sufficient and the leakage flux between the N and S poles of the 2n teeth is ignored and the air gaps are kept the same.

Since the interlinkage magnetic flux φ increases approximately twice, the torque T also approximately doubles according to equation (1).

Therefore, in each of the above embodiments.

The magnetic flux linking the stator windings from the rotor's permanent magnets can be increased, and the torque characteristics of the hybrid stepping motor can be significantly improved.

[Effects of the Invention] Since the permanent magnet rotor according to the present invention is configured as described above, it has excellent effects as described below.

(2) In the case of a stepping motor equipped with a permanent magnet rotor according to the present invention, the torque can be approximately doubled without changing the external dimensions, motor length, or input power.

■Rotor with an odd number of pole teeth Even in a rotor with magnetic poles, the couple acting on the shaft can be reduced, the friction of the bearing can be reduced, and a permanent magnet stepping motor with good step angle accuracy can be provided.

To further explain the above couple using the conventional stepping motor shown in Fig. 14, the number of rotor teeth in this case is 5, pole teeth 3-1 to 3-5 or 3-6 to 3-10, so it is an odd number. It is.

Therefore, in Fig. 14, when the stator magnetic poles 1-1 to 1-3 are magnetized, the pole tooth 3-1 on the first rotor side is attracted upward, and the pole tooth 3-8 is attracted downward, so that the rotor rotates. The child shaft 6 receives a couple of forces from these two different directions, which generates frictional force in the bearing portion of the shaft 6, which tends to deteriorate angular accuracy and torque.

However, when the rotor of the present invention is applied, the rotor of FIG. 2 is replaced with the rotor of FIG. 14.

Magnetic pole 1-1 and teeth 3''-1 are attracted, magnetic pole 1-3 and teeth 3''-8 are attracted, magnetic pole 1-3 and teeth 3''-8 are attracted, and magnetic pole 1-1 and teeth 3''-8 are attracted. The teeth 3°-1 are in a suction relationship, and since the 180° directions are opposite, these suction forces are all canceled, and the couple no longer acts on the rotor shaft 6.

[Brief explanation of the drawing]

Figures 1 to 13 show each embodiment of the present invention, of which Figures 1 (a) and 1 (b) are a side view and a cross-sectional front view, respectively, showing the basic configuration of the present invention in the first embodiment. This is shown as an example. 2A and 2B are a side view and a cross-sectional front view, respectively, showing a second embodiment of the present invention. FIGS. 3A and 3B are a side view and a cross-sectional front view, respectively, showing a third embodiment of the present invention. FIG. 4 shows rotors in opposing positions in the first embodiment;
A developed view showing the relationship between each magnetic pole of the stator, and FIGS. 5(A) and 5(B) are developed views of essential parts of the magnetic poles for explaining the operation of each embodiment of the present invention shown in FIGS. 2 and 3, respectively. It is. FIG. 6 is a cross-sectional side view when the present invention is applied to a stepping motor with a four-pole stator and a step angle of 3.6 degrees. 7(a) and 7(b) respectively show the arrangement diagram of the rotor with the pole teeth shifted by 172 pitches from the conventional example, and the rotor poles when the present invention is applied to the conventional example. FIGS. 8(A) and 8(B) show the arrangement of rotor pole teeth in the conventional case without pitch deviation and in the case where the present invention is applied thereto, respectively. Further, FIG. 9 shows a fourth embodiment of the present invention, in which figures (a) and (b) are a side view and a cross-sectional side view, respectively. FIG. 10 is a side view showing a fifth embodiment of the present invention. FIG. 11 is a side view showing a sixth embodiment of the present invention. FIG. 12 shows a seventh embodiment of the present invention.
Figures (a) and (b) are a cross-sectional front view and a side view, respectively. Further, FIG. 13 is a side view showing an eighth embodiment of the present invention. Furthermore, Figures 14 to 17 show conventional hybrid stepping motors, and Figure 14 of this inner box shows 1
Perspective view with parts cut away, Figures 15 (a) to (d)
16 is an exploded perspective view of the prior art rotor, and FIG. 17 is a perspective view showing the state of the prior art rotor after assembly. S: R: 3, 3': 3A, 3B: 3-1 to 3-10: 1-1.1-3.1-4: 3-1 to 3'-10°L: Stator rotor gear shape Auxiliary piece Pole teeth Mi poles 3”-1 to 31-10: Connection tooth portion 4: Gap 5: Permanent magnet 6: Housing 11: Resin or plastic magnet 12, 12-1 to 12-10 Niblastic magnet or solid magnet

Claims (1)

[Claims] 1. A pair of gear-like pieces made of a magnetic material having n teeth sandwiching a permanent magnet magnetized into two poles in the direction of the rotor output shaft are shifted by 1/2 pitch. In a hybrid permanent magnet rotor having a structure sandwiched in the direction of the rotor output shaft, an interface having an inner diameter that fits with the outer periphery, and having 2n teeth on the inner diameter side with approximately the same tooth width as the gear-shaped piece is used. The outer peripheral yoke part, which has a null gear shape and 2n teeth connected to it, is made so that an auxiliary piece made of a magnetic material made as small as possible is fitted over the entire outer periphery so that the center of the partner teeth coincides with the gear-shaped piece. A permanent magnet rotor characterized by: (However, n is a positive integer of 2 or more) 2. Plastic resin is injected and fixed into the teeth of the auxiliary piece of claim 1, the pole teeth of the hybrid rotor to which this is fitted, the outer periphery of the permanent magnet, etc. Auxiliary piece 2n
When the connecting parts of the iron yokes of the teeth are cut off concentrically around the rotor axis center, and the rotor is magnetized in the rotor axis direction, n N poles and n S poles alternate. Permanent magnet rotor arranged on the outer circumference. 3. A plastic magnet is injected into each tooth groove of the 2n teeth of the auxiliary piece according to claim 1, or a solid magnet is pushed into each tooth groove of the pole teeth on both sides of the n N poles according to claim 2. The magnets in the tooth grooves are magnetized so that the magnets in the tooth grooves face the north pole, and the magnets in the tooth grooves on both sides of the n south poles face the south pole, and the N poles and N poles are arranged alternately on the outer periphery of the hybrid rotor. A permanent magnet rotor that prevents magnetic flux leakage between the south poles. 4. The internal gear-like object having 2n teeth according to claim 1 is provided with a thickness approximately equal to the thickness of the hybrid permanent magnet and is installed concentrically around the outer periphery of the hybrid permanent magnet, and Internal gear-like objects with the same dimensions and material, but with n teeth at intervals, are installed so that they are concentric with each other so that they are in the center of the n tooth spaces of the two hybrid rotors. The thickness is approximately the same as that of the hybrid rotor teeth, and the thickness is approximately the same as that of the hybrid rotor teeth.
The tooth portion is in contact with the n internal gear-like objects, and the 2n internal gear-like teeth and the n internal gear-like teeth arranged on the left and right sides thereof are aligned in a straight line in the direction of the output shaft. A permanent magnet type rotor in which the connecting yokes on the outer periphery of n and 2n internal gear-like objects are cut off concentrically to the output shaft after resin casting or plastic magnets are cast and fixed. 5. 2n according to claim 1, wherein the outer periphery or the inner periphery is connected.
After gluing a plastic magnet or permanent magnet to the tooth groove of a piece made of magnetic material with 2n teeth, cut off the connected outer or inner yoke part and make 2n magnetic material parts such as iron and 2n permanent magnet parts each. A permanent magnet rotor comprising ring-shaped bodies arranged alternately, magnetized as claimed in claim 3, and fitted onto the outer periphery of a hybrid rotor. 6. A ring in which n high-permeability magnetic materials such as iron and n permanent magnets are arranged alternately to form a ring shape, and the outer and inner peripheries are joined together to form a perfect circle. A shaped object,
Two of these n permanent magnets, each magnetized to the same polarity in the radial direction, are placed at a predetermined interval so that the output shaft is at the center of the inner circle of the ring. A disk-shaped yoke with two center holes is attached to the output shaft so as to fit into the inner circle of the ring, and the two disk-shaped yokes are sandwiched between the two disks. Permanent magnets having approximately the same dimensions, a slightly smaller outer diameter, and a thickness approximately equal to the predetermined interval and magnetized into two poles in the direction of the output shaft are arranged, and the radial direction magnetization of the permanent magnets of the two ring-shaped objects is mutually The direction is opposite, and the N-side disc-shaped yoke with bipolar magnetization has a ring-shaped object with a permanent magnet whose outer periphery is magnetized to the S pole, and a permanent magnet that fits into the S-side disc-shaped yoke. A permanent magnet type rotating device in which a N pole is arranged on the outer periphery of a ring-shaped object, and the permanent magnet parts exposed on the outer periphery of the ring-shaped objects are arranged with a 1/2 pitch deviation from each other. Child. 7. The permanent magnet type rotor according to claim 5, wherein n high permeability magnetic material parts such as iron, which are present with n permanent magnets in between, are connected by an inner circular part of the ring-shaped object. 8.N teeth formed on two gear-like pieces are 1/2
If the pitch is not misaligned, add an auxiliary piece made of silicon steel sheet to 360 mm by the thickness of the permanent magnet of the hybrid rotor.
2. The permanent magnet rotor according to claim 1, wherein the rotor is skewed by .degree./2n and stacked straight on both sides outside the skew portion.