JP7107980B2 - magnet motor - Google Patents

Description

The present invention relates to a magnet motor that combines permanent magnets to generate rotational force.

2. Description of the Related Art Conventionally, a so-called "magnet motor" including a rotating body having a plurality of permanent magnets and a fixed body having a plurality of permanent magnets has been known (see, for example, Patent Document 1). Such a magnet motor rotates a rotating shaft fixed to a rotating body by attraction and repulsion forces of permanent magnets attached to the rotating body and the stationary body, respectively.

Japanese Patent No. 5608721

However, in the magnet motor configured as described above, the attractive force and repulsive force of the permanent magnets not only act in a direction to accelerate the rotation of the rotating shaft, but also can become a so-called "cogging torque" that hinders the rotation of the rotating shaft. Therefore, there is a possibility that smooth rotation of the rotating shaft may be hindered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet motor that smoothly rotates a rotary shaft.

In order to solve the above problems, the present invention provides a rotating body having a plurality of first permanent magnets spaced apart in the circumferential direction, a rotating shaft that rotates integrally with the rotating body, and a pair of fixed bodies having a plurality of second permanent magnets arranged so as to sandwich the rotating body and each being spaced apart in the circumferential direction so as to surround the rotating shaft, the magnet motor comprising: It is a combination of magnetization directions in which the first permanent magnet and the second permanent magnet repel each other before passing each other, and the first permanent magnet, the silicon steel plate, and the non-magnetic material are repeatedly arranged in this order in the rotation direction of the rotation shaft. or the fixed body is formed by repeatedly arranging the second permanent magnet, the non-magnetic material, and the silicon steel plate in this order in the rotation direction of the rotating shaft; It is a combination of magnetization directions in which the first permanent magnet and the second permanent magnet are attracted to each other after passing each other, and the first permanent magnet, the non-magnetic material, and the silicon steel plate are repeatedly arranged in this order in the rotation direction of the rotation shaft. The rotating body is formed, or the fixed body is formed by repeatedly arranging the second permanent magnet, the silicon steel plate, and the non-magnetic body in this order in the rotating direction of the rotating shaft .

According to the present invention, of the magnetic forces acting between the first permanent magnet and the second permanent magnet, the magnetic force that hinders the rotation of the rotating shaft is reduced, so that the rotating shaft can be rotated smoothly.

FIG. 2 is a perspective view of the magnet motor 1 partially cut away; 2 is an exploded perspective view of the magnet motor 1; FIG. 4 is a cross-sectional view of a rotating body 20 and a collar 40; FIG. 3 is a plan view of a fixed body 30; FIG. It is a figure which shows the state which developed|developed the rotating body 20 and the fixed body 30 in the two-dimensional plane. FIG. 4 is a diagram showing the state of magnetic fields before permanent magnets 23 and 33 pass each other; FIG. 5 is a diagram showing the state of the magnetic field when the permanent magnets 23 and 33 partially overlap each other; FIG. 4 is a diagram showing the state of the magnetic field when the permanent magnets 23 and 33 are completely overlapped; FIG. 10 is a diagram showing a comparative example in which the silicon steel plate 24 is omitted and showing the state of the magnetic field before the permanent magnets 23 and 33 pass each other; FIG. 10 is a diagram showing a state in which a rotating body 20 and a fixed body 30 according to Modification 1 are developed on a two-dimensional plane; FIG. 10 is a diagram showing a state in which a rotating body 20 and a fixed body 30 according to Modification 2 are developed on a two-dimensional plane, and is an example in which only the rotating body 20 is provided with a silicon steel plate 24 ; FIG. 10 is a diagram showing a state in which the rotating body 20 and the fixed body 30 according to Modification 2 are developed on a two-dimensional plane, and is an example in which only the fixed body 30 is provided with a silicon steel plate 34 . FIG. 11 is a plan view of a disc 50 according to Modification 3;

A magnet motor 1 according to an embodiment will be described below with reference to the drawings. It should be noted that the embodiments of the present invention described below are merely examples of embodying the present invention, and the scope of the present invention is not limited to the scope of the description of the embodiments. Therefore, the present invention can be implemented by adding various changes to the embodiments.

FIG. 1 is a partially broken perspective view of the magnet motor 1. FIG. FIG. 2 is an exploded perspective view of the magnet motor 1. FIG. FIG. 3 is a cross-sectional view of the rotor 20 and the collar 40. As shown in FIG. 4 is a plan view of the fixed body 30. FIG.

The magnet motor 1 rotates the rotating shaft by the attraction and repulsion forces generated between the rotating permanent magnet and the stationary permanent magnet. As shown in FIGS. 1 and 2, the magnet motor 1 includes a rotating shaft 10, a rotating body 20, and a pair of fixed bodies 30a and 30b (hereinafter collectively referred to as "fixed bodies 30"). ) and a collar 40 .

1 and 2, an example of the magnet motor 1 including one rotating body 20 and two fixed bodies 30a and 30b will be described. However, the plurality of rotating bodies 20 and the plurality of fixed bodies 30 may be alternately arranged at predetermined intervals in the axial direction of the rotating shaft 10 . However, fixed bodies 30 are arranged at both ends of the rotating shaft 10 in the axial direction. That is, the magnet motor 1 includes N (N is an integer equal to or greater than 1) rotating bodies 20 and (N+1) stationary bodies 30 .

As shown in FIGS. 1 and 2, the rotating body 20 has a disk-shaped outer shape. A through-hole 21 is formed in the rotating body 20 at the center of the disk so as to extend through the rotating body 20 in the thickness direction. The rotating shaft 10 is inserted through the through hole 21 and fixed to the rotating body 20 . That is, the rotating shaft 10 passes through the center of the rotating body 20 in the thickness direction and rotates integrally with the rotating body 20 .

As shown in FIG. 3, the rotating body 20 includes a disc 22 having a through hole 21 formed therein, and a plurality of permanent magnets (first permanent magnets) 23a, 23b, . (referred to as "permanent magnet 23"), a plurality of silicon steel plates 24a, 24b, . , 25b, .

Permanent magnets 23, silicon steel plates 24, and non-magnetic bodies 25 are alternately arranged on the outer peripheral surface of the disk 22 in the circumferential direction. That is, the plurality of permanent magnets 23 are arranged at positions spaced apart in the circumferential direction of the rotating body 20 . Also, the silicon steel plate 24 is arranged adjacent to the permanent magnet 23 in the circumferential direction of the rotor 20 . Furthermore, the non-magnetic body 25 is arranged between the permanent magnet 23 and the silicon steel plate 24 in the circumferential direction of the rotating body 20 .

The silicon steel plate 24 is obtained by rolling a material containing iron with a small amount (for example, 3 to 7%) of silicon. Silicon steel plate 24 is an example of a material with high magnetic permeability (eg, 2000-6000 μs). The silicon steel plate 24 is inexpensively available among materials having high magnetic permeability. However, instead of the silicon steel plate 24, an amorphous steel plate having a higher magnetic permeability may be used. The non-magnetic material 25 is a non-ferromagnetic material, such as aluminum, glass, or wood. Note that the disk 22 may also be made of a non-magnetic material.

As shown in FIGS. 1 and 2, the fixed body 30 has a disk-shaped outer shape. A through hole 31 is formed through the fixed body 30 in the thickness direction at the center of the disk. The rotary shaft 10 is inserted through the through hole 31 . However, since the diameter of the through hole 31 is larger than that of the rotating shaft 10 , the fixed body 30 does not rotate together with the rotating shaft 10 . A bearing (not shown) that rotatably supports the rotating shaft 10 may be attached to the through hole 31 .

The pair of fixed bodies 30 a and 30 b are arranged so as to sandwich the rotating body 20 in the axial direction of the rotating shaft 10 . That is, the rotating body 20 and the fixed bodies 30a and 30b are opposed to each other with a predetermined gap in the axial direction of the rotating shaft 10. As shown in FIG.

As shown in FIG. 4, the fixed body 30 includes a plurality of permanent magnets (second permanent magnets) 33a, 33b, . A plurality of silicon steel plates 34a, 34b, . and referred to as "non-magnetic material 35").

The permanent magnets 33, the silicon steel plates 34, and the non-magnetic bodies 35 are alternately arranged in the circumferential direction. That is, the plurality of permanent magnets 33 are arranged at positions spaced apart in the circumferential direction of the fixed body 30 . Also, the silicon steel plate 34 is arranged adjacent to the permanent magnet 33 in the circumferential direction of the fixed body 30 . Furthermore, the non-magnetic body 35 is arranged between the permanent magnet 33 and the silicon steel plate 34 in the circumferential direction of the fixed body 30 .

Compositions of the silicon steel plate 34 and the non-magnetic material 35 are common to those of the silicon steel plate 24 and the non-magnetic material 25 described above. 3 and 4 show examples in which both the rotating body 20 and the fixed body 30 are provided with the silicon steel plates 24, 34, but only the rotating body 20 may be provided with the silicon steel plate 24, or the fixed body 20 may be provided with the silicon steel plate 24. Only 30 may be provided with silicon steel plate 34 .

As shown in FIGS. 1 and 2, collar 40 presents a cylindrical profile. The collar 40 is positioned between the pair of fixed bodies 30a and 30b in the axial direction of the rotating shaft 10. As shown in FIG. The axial length of the collar 40 is longer than the thickness of the rotor 20 . The inner diameter dimension of the collar 40 is larger than the diameter of the rotating body 20 . That is, the collar 40 is arranged so as to surround the rotating body 20 at a position spaced apart from the outer peripheral surface of the rotating body 20 . The collar 40 also functions as a spacer that adjusts the spacing between the pair of fixed bodies 30a and 30b.

Further, as shown in FIGS. 1 to 3, an electromagnet 41 is attached to the collar 40 so as to pass through the side surface in the thickness direction. The electromagnet 41 is arranged at a position facing the permanent magnet 23 in the radial direction of the rotating body 20 . Furthermore, a current supply device 42 is connected to the electromagnet 41 . The current supply device 42 supplies a pulse current to the electromagnet 41 at a predetermined timing for generating a magnetic force in the electromagnet 41 .

The current supply device 42 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The CPU implements processes described later by reading and executing program codes stored in the ROM. The RAM is used as a work area when the CPU executes programs.

FIG. 5 is a diagram showing a state in which the rotating body 20 and the fixed body 30 are developed on a two-dimensional plane. In the example of FIG. 5, four rotating bodies 20a, 20b, 20c and 20d and five fixed bodies 30a, 30b, 30c, 30d and 30e are alternately arranged. Further, in the example of FIG. 5, the silicon steel plate 34 is omitted from the fixed body 30 and the gap between them is filled with the non-magnetic material 35 . Further, in FIG. 5, the permanent magnets 23 and 33 are indicated by white background, the silicon steel plate 24 is indicated by diagonal hatching, the non-magnetic materials 25 and 35 are indicated by dot hatching, and reference numbers are omitted except for some.

In the example of FIG. 5, the rotating body 20 has eight permanent magnets 23 . The eight permanent magnets 23 are arranged at intervals of 45° in the circumferential direction of the rotor 20 . On the other hand, fixed body 30 has nine permanent magnets 33 . The nine permanent magnets 33 are arranged at intervals of 40° in the circumferential direction of the fixed body 30 .

That is, the number of permanent magnets 23 possessed by rotating body 20 differs from the number of permanent magnets 33 possessed by fixed body 30 . More specifically, one of the permanent magnets 23 of the rotating body 20 and the permanent magnets 33 of the fixed body 30 is odd-numbered, and the other is even-numbered. Therefore, the relative positions of the adjacent permanent magnets 23 and 33 in the circumferential direction of the adjacent rotating body 20 and fixed body 30 are different from each other. However, the specific number of permanent magnets 23 and 33 that the rotating body 20 and fixed body 30 have is not limited to the above example.

Moreover, the plurality of rotating bodies 20a, 20b, 20c, and 20d are fixed to the rotating shaft 10 so that the phases of the permanent magnets 23 are different in the circumferential direction. In the example of FIG. 5, the phases of the rotating bodies 20a and 20b differ by 180°, the phases of the rotating bodies 20a and 20c differ by 45°, and the phases of the rotating bodies 20c and 20d differ by 180°. However, the specific example of the phase difference of the rotors 20a to 20d is not limited to the above example.

The magnetization directions of the permanent magnets 23 and 33 are inclined with respect to the rotating direction of the rotating shaft 10, as indicated by arrows in FIG. The permanent magnets 23 and 33 are configured, for example, by joining (for example, bonding, welding, etc.) two permanent magnets adjacent to each other in the axial direction of the rotating shaft 10 .

More specifically, the permanent magnets 23 are composed of a permanent magnet A whose magnetization direction is inclined toward the center of the thickness direction of the rotating body 20 with respect to the direction opposite to the rotating direction of the rotating shaft 10 , and On the other hand, a permanent magnet B whose magnetization direction is inclined outward in the thickness direction of the rotating body 20 is combined in the axial direction of the rotating shaft 10 . This combination is common to all permanent magnets 23 included in the rotating bodies 20a to 20d.

Further, the permanent magnet 33 is composed of the permanent magnet C whose magnetization direction is inclined outward in the thickness direction of the fixed body 30 with respect to the direction opposite to the rotation direction of the rotation shaft 10, and the rotation direction of the rotation shaft 10. A permanent magnet D whose magnetization direction is inclined toward the center of the thickness direction of the fixed body 30 is combined in the axial direction of the rotating shaft 10 . This combination is common to all permanent magnets 33 included in fixed bodies 30a to 30e.

In the axial direction of the rotating shaft 10, the permanent magnets A and D face each other with a predetermined gap therebetween, and the permanent magnets B and C face each other with a predetermined gap therebetween. That is, the permanent magnets 23 with reference numbers in FIG. face each other.

In other words, the magnetization directions of the permanent magnets 23 and 33 are a combination that repel each other before the permanent magnets 23 and 33 pass each other in the process of rotating the rotating body 20 . In this case, the silicon steel plate 24 is attached to the front end of the permanent magnet 23 in the rotating direction of the rotating shaft 10 (downstream side of the rotating shaft 10 in the rotating direction). In other words, the silicon steel plate 24 is interposed between the permanent magnets 23 and 33 at the timing (in the example of FIG. 5, before they pass each other) at which the combination of the magnetic fields of the permanent magnets 23 and 33 impedes the rotation of the rotating shaft 10. placed in position.

The relationship between the attractive force and the repulsive force when the permanent magnets 23 and 33 pass each other will be described with reference to FIGS. 6 to 9. FIG. FIG. 6 is a diagram showing the state of the magnetic field before the permanent magnets 23 and 33 pass each other. FIG. 7 is a diagram showing the state of the magnetic field when the permanent magnets 23 and 33 partially overlap. FIG. 8 is a diagram showing the state of the magnetic field when the permanent magnets 23 and 33 are completely overlapped. FIG. 9 is a comparative example in which the silicon steel plate 24 is omitted, and shows the state of the magnetic field before the permanent magnets 23 and 33 pass each other.

As indicated by arrows in FIG. 6, by attaching a silicon steel plate 24 to the front end of the permanent magnet 23, most of the magnetic lines of force emitted from the north pole of the permanent magnet B pass through the silicon steel plate 24 to reach the south pole of the permanent magnet A. Head. Further, as the thickness of the silicon steel plate 24 increases, the ratio of the magnetic lines of force directed from the N pole of the permanent magnet B to the S pole of the permanent magnet A also increases.

As a result, at the front end of the silicon steel plate 24, the permanent magnet A side becomes the N pole, and the permanent magnet B side becomes the S pole. That is, the front end of the permanent magnet 23 and the front end of the silicon steel plate 24 have opposite polarities. As a result, an attractive force acts between the permanent magnets 23 and 33 just before they pass each other, and the first line a of the permanent magnet 23 advances (rotates) to the vicinity of the second line B of the permanent magnet 33 . That is, the rotating body 20 rotates in the rotating direction of the rotating shaft 10 due to this attractive force. Of the plurality of permanent magnets 23 shown in FIG. 5, "+" is added to the permanent magnets 23 that receive the force in the direction to rotate the rotating body 20. As shown in FIG.

Next, as shown in FIGS. 7 and 8, when the first line a of the permanent magnet 23 is located between the second line B and the fifth line F of the permanent magnet 33, the line between the permanent magnets 23, 33 has an attractive force. As a result, the force that rotates the rotating body 20 generated between the permanent magnets 23 and 33 gradually decreases, and finally acts in a direction that hinders the rotation of the rotating body 20 . Of the plurality of permanent magnets 23 shown in FIG. 5, "0" is added to the permanent magnets 23 that do not generate a force in the direction to rotate the rotating body 20, and the permanent magnets that receive a force in the direction that hinders the rotation of the rotating body 20. 23 is appended with "-".

Next, when the first line a of the permanent magnet 23 exceeds the fifth line F of the permanent magnet 33 from the state of FIG. Then, the S pole of the permanent magnet B repels the S pole of the permanent magnet C of the stationary body 30b. This repulsive force causes the rotating body 20 to rotate in the direction of rotation of the rotating shaft 10 .

As shown in FIGS. 6 to 8, depending on the relative positions of the permanent magnets 23 and 33, a force (hereinafter referred to as "rotational force") directed to rotating the rotating shaft 10 and a rotating force are applied to the rotating body 20. A force in a direction that inhibits the rotation of the shaft 10 (hereinafter referred to as "impeding force") is alternately applied. However, by providing a silicon steel plate 24 at the front end of the permanent magnet 23 and reversing the polarity, the permanent magnet 23 added with "+" in FIG. 5 is added with "0" and "-" in FIG. more than the permanent magnets 23. As a result, the rotational force of the rotating body 20 as a whole exceeds the impeding force, so that the rotating body 20 can rotate continuously.

On the other hand, as shown in FIG. 9, if the silicon steel plate 24 is omitted, a repulsive force that inhibits the rotation of the rotating shaft 10 is generated just before the permanent magnets 23 and 33 pass each other. As a result, in the example of FIG. 9, the impeding force exceeds the rotational force of the rotating body 20 as a whole, and the rotating body 20 cannot rotate continuously.

In addition, the current supply device 42 supplies a pulse current to the electromagnet 41 at the timing when the magnetic force that accelerates the rotation of the rotating shaft 10 is generated. As an example, the current supply device 42 may supply a current to the electromagnet 41 in a direction to attract the permanent magnet 23 just before the permanent magnet 23 faces the electromagnet 41 while the rotary shaft 10 is rotating. As another example, the current supply device 42 may supply a current to the electromagnet 41 in a direction to repel the permanent magnet 23 immediately after the permanent magnet 23 passes the electromagnet 41 in the process of rotating the rotating shaft 10 .

The position of the permanent magnet 23 can be detected, for example, by a position sensor (eg, rotary encoder) that detects the position (phase) of the permanent magnet 23 . That is, the current supply device 42 may recognize that the permanent magnet 23 has reached a predetermined position based on the detection result of the position sensor, and supply current to the electromagnet 41 at that timing.

According to the above embodiment, for example, the following operational effects are obtained.

According to the above embodiment, since the silicon steel plate 24 is attached to the front end of the permanent magnet 23, as shown in FIG. Generates a rotating force. As a result, the rotational force exceeds the impeding force, so that the rotating shaft 10 can be rotated smoothly.

If magnets with strong magnetic force are used as the permanent magnets 23 and 33, both the attractive force and the repulsive force increase. However, according to the above-described embodiment, the repulsive force just before the permanent magnets 23 and 33 pass each other is converted into the attractive force, so that the permanent magnets 23 and 33 strongly attract each other just before they pass each other. After passing each other, they will strongly repel each other.

Further, according to the above-described embodiment, the number of permanent magnets 23, 33 included in the rotating body 20 and the fixed body 30 is made different, and the phases of the permanent magnets 23 are made different in the plurality of rotating bodies 20a to 20d. The timing at which the plurality of permanent magnets 23 receive the impeding force can be distributed. As a result, the cogging torque can be reduced, and the rotary shaft 10 can be rotated more smoothly.

Further, according to the above-described embodiment, the magnetization directions of the permanent magnets 23 and 33 are inclined with respect to the rotation direction of the rotating shaft 10, so that the attractive force and the repulsive force that become the rotational force can be increased. As a result, the rotating shaft 10 can be rotated more smoothly.

Further, according to the above embodiment, the electromagnet 41 and the current supply device 42 apply a force to the rotating body 20 in a direction to accelerate the rotating shaft 10, so that the rotating shaft 10 can be rotated more smoothly. The timing of supplying the current to the electromagnet 41 may be, for example, only the timing of starting the rotation of the rotating shaft 10 or each time the permanent magnet 23 reaches a predetermined position. Also, the electromagnet 41 and the current supply device 42 can be omitted.

Further, according to the above embodiment, since the silicon steel plate 24 is attached to the rotating body 20 side, the weight of the rotating body 20 increases. This increases the inertial force of the rotating body 20 (that is, the rotating body 20 functions as a so-called "flywheel"), so that the rotating shaft 10 can be rotated more smoothly.

Furthermore, in the embodiment described above, the length of the permanent magnet 23 is made longer than that of the permanent magnet 33 in the direction of rotation of the rotating shaft 10 . As a result, the permanent magnet 23 can receive the attractive force from the next permanent magnet 33 before the repulsive force received from the passing permanent magnet 33 weakens. As a result, it is possible to shorten the section in which the force in the direction to rotate the rotating body 20 is not generated (the section to which "0" is added in FIG. 5). The relationship between the lengths of the permanent magnets 23 and 33 is appropriately adjusted according to the number of permanent magnets 23 and 33 attached to the rotating body 20 and the fixed body 30, the circumference lengths of the rotating body 20 and the fixed body 30, and the like. be done.

[Modification 1]
The arrangement of the silicon steel plates is not limited to the example shown in FIG. FIG. 10 is a diagram showing a state in which the rotating body 20 and the fixed body 30 according to Modification 1 are developed on a two-dimensional plane. A detailed description of the common points with the above embodiment will be omitted, and the description will focus on the points of difference.

Modification 1 is different from the above embodiment in that only the fixed body 30 of the rotating body 20 and the fixed body 30 is provided with the silicon steel plate 34, and the rotating body 20 is not provided with the silicon steel plate 24. . More specifically, the silicon steel plate 34 is provided at the rear end of the fixed body 30 in the rotational direction of the rotating shaft 10 (upstream side in the rotating direction of the rotating shaft 10). On the other hand, the position of the silicon steel plate 24 (FIG. 5) of the rotating body 20 is filled with the non-magnetic material 25 .

According to Modification 1, the polarity of the rear end side of the permanent magnet 33 is reversed, so as described with reference to FIG. As a result, the rotating shaft 10 can be rotated smoothly.

In this way, the silicon steel plates 24 and 34 may be provided only on one of the rotating body 20 and fixed body 30 . As still another example, the rotating body 20 shown in FIG. 5 and the fixed body 30 shown in FIG. In this case, it is desirable that the silicon steel plates 24 and 34 have different thicknesses in the circumferential direction.

[Modification 2]
Also, the arrangement of the silicon steel plates 24, 34 is not limited to the examples shown in FIGS. FIG. 11 is a diagram showing a state in which the rotating body 20 and the fixed body 30 according to Modification 2 are developed on a two-dimensional plane, and is an example in which only the rotating body 20 is provided with the silicon steel plate 24 . FIG. 12 is a diagram showing a state in which the rotating body 20 and the fixed body 30 according to Modification 2 are developed on a two-dimensional plane, and is an example in which only the fixed body 30 is provided with the silicon steel plate 34 . A detailed description of the points common to the above-described embodiment and Modification 1 will be omitted, and the description will focus on the points of difference.

In the permanent magnet 23 shown in FIG. 11, the magnetization directions of the permanent magnets A and B are opposite to those in FIG. That is, the magnetization direction of the permanent magnet A is inclined outward in the thickness direction of the rotating body 20 with respect to the rotating direction of the rotating shaft 10 . The magnetization direction of the permanent magnet B is inclined toward the center of the thickness direction of the rotating body 20 with respect to the direction opposite to the rotating direction of the rotating shaft 10 . On the other hand, the magnetization directions of the permanent magnets C and D are the same as in FIG. The same applies to FIG. 12 as well.

The combination of magnetization directions in FIGS. 11 and 12 attracts each other just before the permanent magnets 23 and 33 pass each other to generate a force in the direction to rotate the rotating shaft 10, and after the permanent magnets 23 and 33 pass each other. , attract each other and inhibit the rotation of the rotary shaft 10 .

Therefore, as shown in FIGS. 11 and 12, at the timing when the combination of the magnetic fields of the permanent magnets 23 and 33 impedes the rotation of the rotating shaft 10 (after passing each other in FIGS. 11 and 12), the permanent magnets 23 and 33 By arranging the silicon steel plate 24 at a position interposed between them, the rotary shaft 10 can be rotated smoothly.

That is, as shown in FIG. 11, the silicon steel plate 24 is arranged at the rear end of the permanent magnet 23 in the rotating direction of the rotating shaft 10 (on the upstream side in the rotating direction of the rotating shaft 10). Further, as shown in FIG. 12, the silicon steel plate 34 is arranged at the front end of the permanent magnet 33 in the rotating direction of the rotating shaft 10 (on the downstream side in the rotating direction of the rotating shaft 10).

However, the example of converting the attractive force after the permanent magnets 23 and 33 pass each other into the repulsive force (FIGS. 11 and 12) is the example of converting the repulsive force before the permanent magnets 23 and 33 pass each other into the attractive force (FIG. 11 and FIG. 12). 5 and FIG. 11), the force to rotate the rotating shaft 10 is weak. Therefore, the arrangement of the silicon steel plates 24, 34 is more desirable in the examples of FIGS. 5 and 10 than in the examples of FIGS.

The silicon steel plates 24 , 34 may be provided only on one of the rotating body 20 and the fixed body 30 , or may be provided on both the rotating body 20 and the fixed body 30 . Moreover, when the silicon steel plates 24, 34 are provided on both the rotating body 20 and the fixed body 30, it is desirable that the silicon steel plates 24, 34 have different thicknesses in the circumferential direction. Further, instead of reversing the magnetization directions of the permanent magnets A and B between FIGS. 5 and 10 and FIGS. 11 and 12, the magnetization directions of the permanent magnets C and D may be reversed.

[Modification 3]
In addition, in the above-described embodiment and modified examples 1 and 2, the example in which the plurality of rotating bodies 20 are arranged in the axial direction of the rotating shaft 10 has been described. However, the layout of the plurality of rotating bodies 20 is not limited to the above example. The layout of the rotors 20a, 20b, and 20c according to Modification 3 will be described below with reference to FIG. FIG. 13 is a plan view of a disc 50 according to Modification 3. FIG. A detailed description of the common points with the above embodiment will be omitted, and the description will focus on the points of difference.

The disc 50 is made of, for example, a non-magnetic material. The disk 50 is configured by concentrically integrating a plurality of rotating bodies 20a, 20b, and 20c having different diameters. A through hole 21 through which the rotating shaft 10 is inserted is formed in the center of the disc 50 . For example, the disk 50 may be formed by forming a plurality of through-holes in a disk-shaped non-magnetic body and housing the permanent magnet 23, the silicon steel plate 24, and the non-magnetic body 25 in the through-holes. Although illustration of the silicon steel plate 24 and the non-magnetic material 25 is omitted in FIG. 13, they are arranged in the same manner as in FIG.

The permanent magnets 23 of the rotors 20a and 20b adjacent to each other in the radial direction of the disk 50 have different phases in the circumferential direction. Also, the permanent magnets 23 of the rotors 20b and 20c adjacent in the radial direction of the disk 50 have different phases in the circumferential direction. On the other hand, the permanent magnets 23 of the rotating bodies 20a and 20c may have the same phase or different phases in the circumferential direction.

Also, the number of permanent magnets 23 may be greater toward the outer side of the plurality of rotating bodies 20a, 20b, and 20c. Moreover, the length of the permanent magnet 23 in the circumferential direction may be longer toward the outer side of the plurality of rotating bodies 20a, 20b, and 20c. Furthermore, the interval between the permanent magnets 23 adjacent in the circumferential direction may be larger toward the outer side of the plurality of rotating bodies 20a, 20b, and 20c.

Further, although not shown, the pair of fixed bodies 30a and 30b are arranged so as to sandwich the disk 50 in the axial direction of the rotating shaft 10. As shown in FIG. The configuration of fixed bodies 30a and 30b is the same as that of FIG. 4, but permanent magnets 33 are elongated in the radial direction so as to face permanent magnets 23 of rotating bodies 20a, 20b and 20c.

According to Modification 3, cogging torque can be reduced while reducing the axial dimension of the magnet motor 1 . In addition, since the number of parts can be reduced compared to arranging a plurality of rotating bodies 20 in the axial direction, an effect of reducing the manufacturing cost of the magnet motor 1 can be expected.

DESCRIPTION OF SYMBOLS 1... Magnet motor, 10... Rotating shaft, 20... Rotating body, 22... Disk, 23... Permanent magnet (first permanent magnet), 24, 34... Silicon steel plate, 25, 35... Non-magnetic material, 30... Fixed body , 33... Permanent magnet (second permanent magnet), 40... Collar, 41... Electromagnet, 42... Current supply device, 50... Disk

Claims (8)

a rotating body having a plurality of first permanent magnets spaced apart in the circumferential direction;
a rotating shaft that rotates integrally with the rotating body;
a pair of fixed bodies having a plurality of second permanent magnets arranged so as to sandwich the rotating body in the axial direction of the rotating shaft, each having a plurality of second permanent magnets spaced apart in the circumferential direction so as to surround the rotating shaft; A magnet motor,
A combination of magnetization directions in which the first permanent magnet and the second permanent magnet repel each other before passing each other, and the first permanent magnet, the silicon steel plate, and the non-magnetic material are repeatedly arranged in this order in the rotation direction of the rotation shaft. and the rotating body is formed, or the fixed body is formed by repeatedly arranging the second permanent magnet, the non-magnetic material, and the silicon steel plate in this order in the rotation direction of the rotating shaft,
or,
It is a combination of magnetization directions in which the first permanent magnet and the second permanent magnet are attracted to each other after passing each other, and the first permanent magnet, the non-magnetic material, and the silicon steel plate are repeatedly arranged in this order in the rotating direction of the rotating shaft. or the fixed body is formed by repeatedly arranging the second permanent magnet, the silicon steel plate, and the non-magnetic material in this order in the rotation direction of the rotating shaft. magnet motor. In the magnet motor according to claim 1,
A magnet motor, wherein the silicon steel plate is attached to only one of the first permanent magnet and the second permanent magnet. In the magnet motor according to claim 1,
A magnet motor, wherein the silicon steel plates are attached to both the first permanent magnet and the second permanent magnet and have different thicknesses. In the magnet motor according to any one of claims 1 to 3,
The first permanent magnet and the second permanent magnet are configured by combining two permanent magnets, the magnetization directions of which are inclined in opposite directions with respect to the rotating direction of the rotating shaft, in the axial direction of the rotating shaft. A magnet motor characterized by: In the magnet motor according to any one of claims 1 to 4,
A magnet motor, wherein the number of the first permanent magnets included in the rotating body and the number of the second permanent magnets included in the fixed body are different from each other. In the magnet motor according to any one of claims 1 to 5,
an electromagnet facing the first permanent magnet in the radial direction of the rotating body;
A magnet motor, comprising: a current supply device that supplies a current to the electromagnet at a timing at which a magnetic force is generated in a direction that accelerates the rotation of the rotating body. In the magnet motor according to any one of claims 1 to 6,
A plurality of the rotating bodies and a plurality of the fixed bodies are alternately arranged in the axial direction of the rotating shaft,
A magnet motor, wherein the plurality of rotating bodies are fixed to the rotating shaft so that the phases of the plurality of first permanent magnets are different from each other. In the magnet motor according to any one of claims 1 to 6,
A disk configured by integrating a plurality of said rotating bodies having different diameters concentrically and rotating integrally with said rotating shaft,
The pair of fixed bodies are arranged so as to sandwich the disk in the axial direction of the rotating shaft,
The magnet motor, wherein the first permanent magnets of the two rotating bodies adjacent to each other in the radial direction of the disk have different phases in the circumferential direction.

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