JP2001136721A - Axially-spaced permanent magnet synchronous machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an axially-spaced permanent magnet synchronous machine which can achieve both high rotational speed and a high efficiency. SOLUTION: Each of rotors 2, 3 comprises a plurality of sector-form coils 11, arranged into a shape of disc and iron cores 12 for each coil 11. A moving member 4 comprises a plurality of sector-form permanent magnets 22 and a plurality of sector-formed iron cores 23. The permanent magnets 22 and the iron cores 23 are arranged alternately into a disc shape. The permanent magnets 22 facing opposite the stators 2, 3 are magnetized alternately in S poles and N poles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial gap type permanent magnet synchronous machine in which a disk-shaped mover and a stator are arranged to face each other.

[0002]

2. Description of the Related Art A synchronous machine of this type has a disk-shaped movable element and a stator arranged opposite to each other, and has a feature that its axial length is short. 2717
No. 84 is disclosed.

In the synchronous machine disclosed in the above publication, as shown in FIG. 11, a disk-shaped rotor 102 is disposed between a pair of disk-shaped stators 101, and a shaft (not shown) is provided at the center of the rotor 102. Is fixed. Each stator 101 includes an iron core 103 and a plurality of fan-shaped coils 104 supported by the iron core 103. The rotor 102 is a non-magnetic rotating frame 10.
5 and a plurality of sector-shaped permanent magnets 106 s and 106 n supported by the rotating frame 105. Each coil 1
The rotor 102 is rotated by the force acting on each of the permanent magnets 106s and 106n in the magnetic field 04.

The above publication also discloses a synchronous machine as shown in FIG. In this synchronous machine, FIG.
Instead of each permanent magnet 106s of the rotor 102 shown in FIG.
A plurality of fan-shaped iron cores 108 are employed. In this case, not only the force acting on each permanent magnet 106n in the magnetic field of each coil 104, but also the attractive force acting on each iron core 108 of the rotor 102 (the attractive force due to the reluctance of each iron core 108) in the magnetic field. Also, the rotor 102 rotates.

[0005]

By the way, in the conventional synchronous machine shown in FIG. 11, many permanent magnets 106s and 106n are arranged on the rotor 102. In such a configuration, the induced current of each coil 104 immediately increases with an increase in the rotation speed of the rotor 102, so that it becomes difficult to supply a drive current to each coil 104 when the rotation of the rotor 102 increases. For this reason, the rotor 102 could not be rotated at high speed.

On the other hand, in the conventional synchronous machine shown in FIG. 12, each permanent magnet 106n of the rotor 102 and each iron core 108
Are alternately arranged, and the number of the permanent magnets 106n is small, so that the rotational torque is reduced, but the induced current of each coil 104 increases gradually with an increase in the rotational speed of the rotor 102. Therefore, a drive current easily flows through each coil 104, and the rotor 102 can be rotated at a high speed.

However, on the one end face of the rotor 102, only the N pole of each permanent magnet 106n is arranged, so that the rotating torque based on the force acting on each permanent magnet 106n in the magnetic field and the magnetic field In the above, none of the rotation torques based on the suction force acting on each iron core 108 could be generated with high efficiency.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an axial gap type permanent magnet synchronous machine which can achieve both high rotation and high efficiency.

[0009]

According to a first aspect of the present invention, there is provided a disk-shaped first field member having a coil and a disk-shaped second field member having a magnet. In the axial gap type permanent magnet synchronous machine in which the first and second field bodies are opposed to each other with a gap provided in the axial direction, the first field body includes a plurality of fan-shaped coils and an iron core of each of the coils. The second field body has a plurality of sector-shaped permanent magnets and a plurality of sector-shaped iron cores, and the sector-shaped respective permanent magnets and the respective sector-shaped coils are arranged in a disk shape. The iron cores are arranged alternately and in a disk shape, and the magnetic pole faces of the respective permanent magnets facing the first field body are alternately magnetized into S poles and N poles.

According to a second aspect of the present invention, there is provided a disk-shaped first field member having a coil and a disk-shaped second field member having a magnet, and the first and second field members are arranged in the axial direction. In the axial gap type permanent magnet synchronous machine provided with a gap and opposed to each other, the first field body has a plurality of coils and an iron core of each of the coils, and the coils are arranged in a disk shape, The second field body has a plurality of permanent magnets and a plurality of iron cores, and the permanent magnets and the iron cores are arranged alternately and in a disk shape,
The magnetic pole surface of each of the permanent magnets facing the field body is alternately magnetized to S poles and N poles.

[0011] According to such a configuration, the second field body has the fan-shaped permanent magnets and the iron cores arranged alternately and in a disk shape.
The pole faces of the permanent magnets facing the first field body are S pole and N pole.
The poles are alternately magnetized. Therefore, the force acting on each permanent magnet of the second field body in the magnetic field of each coil of the first field body and the attraction force acting on each iron core of the second field body in the magnetic field (caused by the reluctance of each iron core) (Attraction force), a rotational torque is generated in the second field body. Here, since the fan-shaped permanent magnets and the iron cores are alternately arranged, the number of the permanent magnets is reduced by the number of the iron cores. For this reason, the increase in the induced current of each coil of the first field body with respect to the increase in the rotation speed of the second field body becomes gentle,
A drive current easily flows through each coil, and the second field body can be rotated at high speed. Further, since the magnetic pole faces of the permanent magnets facing the first field body are alternately magnetized to the S pole and the N pole, the second poles based on the forces acting on the respective permanent magnets in the magnetic field.
Both the rotation torque of the field body and the rotation torque of the second field body based on the attractive force acting on each iron core of the second field body in the magnetic field can be generated with high efficiency.

In one embodiment, the ratio of the number of the coils to the number of the permanent magnets is 3: 2. By setting this ratio, the first field with respect to the increase in the rotation speed of the second field body is set.
The increase in the induced current of each coil of the field body can be made sufficiently slow, the drive current can easily flow through each coil, and the second field body can be rotated at high speed.

In one embodiment, the width of each permanent magnet of the second field body in the circumferential direction of the second field body is wider than the width of each iron core of the second field body in the circumferential direction. . In this case, the increase in the rotational torque of the second field body with the increase in the width of each permanent magnet is larger than the decrease in the rotational torque of the second field body with the decrease in the width of each iron core. As a result, the rotational torque of the second field body increases.

In one embodiment, a pair of first field bodies is provided as the first field bodies, and each of the first field bodies is arranged on both sides of the second field body. The first field body may be arranged on one side of the second field body. However, if a pair of first field bodies is arranged on both sides of the second field body as in this embodiment, the rotation of the second field body will be reduced. Torque can be generated with very high efficiency.

In one embodiment, the fan-shaped coils arranged in a disk shape are adjacent to each other. In this case, since the magnetic field lines of each coil cross the second field body without passing through between the coils, the rotational torque of the second field body can be generated with higher efficiency.

In one embodiment, the core of the first field member, the core of the second field member, or the permanent magnet is extended to the coil edge. In this case, in order to secure a required magnetic path area, the core of the first field body, the core of the second field body, or the permanent magnet can be reduced in axial dimension.
The rotation torque of the field body can be generated with higher efficiency. Further, the core of the first field member, the core of the second field member, or the permanent magnet can have a large magnetic path area if the axial dimension is not changed, and the rotational torque of the second field member can be further increased. It can be generated with efficiency.

In one embodiment, the iron core of the first field member or the iron core of the second field member is formed of a silicon steel plate. in this case,
Since the silicon steel sheet has a high magnetic flux saturation density, even if the first field member or the second field member is formed thin in the axial direction, the magnetic flux can easily pass therethrough, and the torque can be increased.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of an axial gap type permanent magnet synchronous machine according to the present invention. FIG. 1 is a perspective view showing a schematic configuration of the synchronous machine, and FIG. 2 is a sectional view showing the synchronous machine.

As shown in FIG. 1, in the axial gap type permanent magnet synchronous machine 1 of the present embodiment, a disk-shaped movable element 4 is arranged between a pair of disk-shaped stators 2 and 3. . The shaft 5 is rotatably supported, the shaft 5 is fixed to the center of the mover 4, and the shaft 5 is passed through the central holes 2a and 3a of the stators 2 and 3, respectively.

More specifically, as shown in FIG.
Is fixed to the frame 8 of the synchronous machine 1, and the mover 4 is disposed with a slight gap provided between the stators 2 and 3. The shaft 5 is rotatably supported by two bearings 6 and 7. The shaft 5 is passed through a center hole 4 a of the mover 4 and is fixed to the mover 4. The shaft 5 is rotatably passed through central holes 2a and 3a of the stators 2 and 3, respectively.

Each of the stators 2 and 3 has the same structure. FIG. 3 is a plan view showing each of the stators 2 and 3, and FIG. 4 is a cross-sectional view showing each of the stators 2 and 3 and the mover 4 taken along the line AA in FIG. As shown in FIGS. 3 and 4, each of the stators 2 and 3 includes a plurality of substantially fan-shaped coils 11 and an iron core 12 of each coil 11.

The iron core 12 is formed by laminating many electromagnetic steel sheets. The iron core 12 has a substantially disc shape as a whole, a hole 12a formed in the center thereof, a plurality of grooves 12b formed radially on one end surface thereof, and a sector-shaped portion 12c formed between the grooves 12b. Is formed. Each fan-shaped coil 11 is fitted and fixed to each fan-shaped portion 12c and each groove 12b of the iron core 12. Since the four corners of each sector 12c are rounded, the outer shape of each sector 12c matches the inner shape of each coil 11, and there is no gap between each coil 11 and the iron core 12. Also, the winding portions 11a of a pair of adjacent coils 11 are fitted into one groove 12b, and these coils 11 are adjacent to each other.

FIG. 5 is a plan view showing the mover 4. As shown in FIGS. 4 and 5, the mover 4 includes a nonmagnetic frame 21,
Each fan-shaped permanent magnet 22 and each fan-shaped iron core 23 are provided. The frame 21 has fan-shaped openings 21a and fan-shaped openings 21b, and the openings 21a and the openings 21b are alternately arranged. A permanent magnet 22 is fitted and fixed in each opening 21a.
Each iron core 23 is fitted and fixed to b. Therefore, each permanent magnet 22 and each iron core 23 are arranged alternately.

Each of the permanent magnets 22 has a magnetic pole surface facing each of the stators 2 and 3, and these magnetic pole surfaces are an S pole and an N pole. On one end face of the mover 4, S poles and N poles of the magnetic pole faces of the respective permanent magnets 22 are alternately arranged. Similarly, also on the other end surface of the mover 4, the S pole and the N pole of the magnetic pole surface of each permanent magnet 22 are alternately arranged. Each iron core 23
Is obtained by laminating a large number of electromagnetic steel sheets.

Each permanent magnet 22 in the circumferential direction of the mover 4
Is wider than the width Wi of each iron core 23 in the circumferential direction. The ratio between the number of the coils 11 of the stator 2 (or the number of the coils 11 of the stator 3) and the number of the permanent magnets 22 of the mover 4 is set to 3: 2.

Next, an outline of the operation of the synchronous machine 1 having such a configuration will be described. 6A (a) to 6 (f) and FIG. 6B (g)
(L) schematically show the rotation stroke of the mover 4 in the synchronous machine 1 of the present embodiment. Each drive current W, U, V
The (three-phase alternating current) has a phase difference of 120 °, and flows through each coil 11 of each of the stators 2 and 3. Each drive current W,
Each of the coils 11 of each of the stators 2 and 3 is classified into three types of coils 11W, 11U and 11V according to which of U and V flows. The coil 11W of the stator 2 and the coil 11W of the stator 3 face each other, and the coil 11U of the stator 2 and the
11U are opposed, and the coil 11V of the stator 2 and the coil 11V of the stator 3 are opposed.

The winding direction of each coil of the stator 2 and the winding direction of each coil of the stator 3 are opposite to each other. The direction in which the drive current flows is the same. For this reason, the magnetic lines of force from one side of the coils 11W of the stators 2 and 3 to the other are formed, and the magnetic lines of force from one side of the coils 11U of the stators 2 and 3 to the other are formed. Magnetic lines of force from one side of the coil 11V to the other are formed.

FIGS. 6A (a) to 6 (f) and FIG. 6B
In (g) to (l), the magnetic lines of force are indicated by alternate long and short dash lines, and the magnetic lines of force are simply a number of lines of magnetic force. Now, for example, focusing on the coil 11U of each of the stators 2 and 3, in FIG. 6A, the drive current U is in a state of 0, and no lines of magnetic force are generated between the coils 11U of each of the stators 2 and 3. . At this time, the respective drive currents W and V flow through the coils 11W and 11V of the stators 2 and 3, respectively, and the lines of magnetic force between the coils 11W of the stators 2 and 3 and the coils 11V of the stators 2 and 3 respectively. Lines of magnetic force are generated, and a rotational torque is generated in the mover 4.

Subsequently, in FIG. 6A (b), the drive current U increases in the positive direction, and the coil 1 of each of the stators 2, 3
Magnetic force lines Mu1 are generated in 1U. Further, when the drive current V is negative, a magnetic field line Mv1 in the opposite direction is generated between the coils 11V of the stators 2 and 3, and the magnetic field lines Mu1 and Mv1 draw a loop. Further, since the direction of the line of magnetic force Mu1 is different from the direction of the line of magnetic force of the permanent magnet 22, the loop of the lines of magnetic force Mu1, Mv1 does not pass through the permanent magnet 22, but passes through the iron core 23 having small reluctance. At this time, an attractive force acts on the iron core 23 so that the loop of the magnetic lines of force Mu1, Mv1 becomes small, and the mover 4 rotates in the direction of arrow B.

6A (c), the magnetic force lines Mu1 pass through the iron core 23, the magnetic force lines Mv1 pass through the permanent magnet 22, and the force acts on the iron core 23 and the permanent magnet 22 so that the loop of the magnetic force lines Mu1, Mv1 is further reduced. Then, the mover 4 rotates in the direction of arrow B. In addition, the drive current W is in the state of 0, and no lines of magnetic force are generated between the coils 11W of the stators 2 and 3.

In FIG. 6D, each magnetic field line Mu1, M
v1 loop is minimized. Further, the drive current W increases in the negative direction, and the lines of magnetic force M between the coils 11W of the stators 2 and 3 are increased.
w1 occurs. The directions of the lines of magnetic force Mu1 and Mw1 are opposite, and the lines of magnetic force Mu1 and Mw1 form a loop. Since the direction of the line of magnetic force Mw1 is different from the direction of the line of magnetic force of the permanent magnet 22, the loop of each line of magnetic force Mu1, Mw1 does not pass through the permanent magnet 22, but passes through the iron core 23 having small reluctance. Attraction force acts on the iron core 23 so that the loop of the lines of magnetic force Mu1 and Mw1 is reduced, and the mover 4 rotates in the direction of arrow B.

In FIG. 6A (e), the lines of magnetic force Mu1 pass through the magnet 22, the lines of magnetic force Mw1 pass through the iron core 23, and the lines of magnetic force M
A force acts on the iron core 23 and the permanent magnet 22 so that the loop of u1 and Mw1 is further reduced, and the mover 4 rotates in the direction of arrow B. In addition, the drive current V is 0, and no lines of magnetic force are generated in the coils 11V of the stators 2 and 3.

In FIG. 6A (f), each magnetic field line Mu1, M
The loop of w1 is minimized. In FIG. 6B (g), the drive current U becomes 0 again, and the coils 11U of the stators 2 and 3
No lines of magnetic force are generated between them. At this time, each stator 2,
Magnetic lines of force between the coils 11W of the third stator and the coils 11V of the stators 2 and 3 are generated.

In FIG. 6 (h), the drive current U increases in the negative direction, and a magnetic field line Mu2 is generated between the coils 11U of the stators 2 and 3. In addition, when the drive current V is positive, the lines of magnetic force Mv2 in the opposite direction are generated between the coils 11V of the stators 2 and 3, and the lines of magnetic force Mu2 and the lines of magnetic force Mv2 draw a loop. Although the directions of the magnetic force lines Mu2 and Mv2 are opposite to those in FIG. 6A (b), the polarities of the permanent magnets 22 passing near the coils 11U of the stators 2 and 3 are also shown in FIG. 6A (b). As a result, the loop of the magnetic field lines Mu2 and Mv2 forms the permanent magnet 2 as in the case of FIG. 6A (b).
It does not pass through 2 but passes through the iron core 23. And each magnetic field line Mu2,
Attraction force acts on the iron core 23 so that the loop of Mv2 becomes small, and the mover 4 rotates in the direction of arrow B.

In FIG. 6B (i), each line of magnetic force Mu2, M
A force acts on the iron core 23 and the permanent magnet 22 so that the loop of v2 is further reduced, and the mover 4 rotates in the direction of arrow B. In addition, the driving current W is in a state of 0, and each stator 2,
No magnetic lines of force are generated between the third coils 11W.

In FIG. 6B (j), the lines of magnetic force Mu2, Mv2
Loop is minimized. Further, the drive current W increases in the positive direction, and the lines of magnetic force Mw2 between the coils 11W of the stators 2 and 3 are increased.
Occurs. FIG. 6A shows the directions of the magnetic force lines Mu2 and Mw2.
The reverse of the case of (d), the coil 1 of each stator 2, 3
The polarity of the permanent magnet 22 passing near 1 W is also shown in FIG.
6A (d), the loop of the lines of magnetic force Mu2 and Mv2 passes through the iron core 23 without passing through the permanent magnet 22, and the attracting force acts on the iron core 23 as in the case of FIG. 4
Rotates in the direction of arrow B.

In FIG. 6B (k), each line of magnetic force Mu2, M
A force acts on the iron core 23 and the permanent magnet 22 so that the loop of w2 is further reduced, and the mover 4 rotates in the direction of arrow B. In addition, the driving current V is in a state of 0, and each stator 2,
No magnetic lines of force are generated in the third coil 11V.

In FIG. 6B (l), each line of magnetic force Mu2, M
The loop of w2 is minimized. Thereafter, similarly, each stator 2, 3
6A (a) to (f) and FIGS. 6B (g) to (l) are repeated for the coil 11U, and the phases of the other coils 11W and 11V of the stators 2 and 3 are also shifted. 6A (a) to (f) and FIG. 6B (g) in the state.
The same process as (l) is repeated, whereby the mover 4 keeps rotating in the direction of arrow B.

As described above, in the present embodiment, the mover 4 is rotated by the respective forces acting on each permanent magnet 22 and each iron core 23 of the mover 4. In addition, since the structure is such that the iron cores 23 are interposed between the permanent magnets 22, each of the stators with respect to the increase in the rotational speed of the mover 4 is different from the structure in which only the permanent magnets are arranged and the iron cores are not interposed. The increase in the induced current of each of the coils 11 becomes slow. Therefore, a drive current easily flows through each coil 11, and the mover 4 can be rotated at a high speed. 6A and 6B, since the S pole and the N pole of the magnetic pole surface of each permanent magnet 22 are alternately arranged.
As is clear from the description of the operation, the force acting on each permanent magnet 22 and the force acting on each iron core 23 are efficiently used,
The rotating torque of the mover 4 can be generated with high efficiency.

Since the ratio of the number of the coils 11 of the stator 2 (or the number of the coils 11 of the stator 3) to the number of the permanent magnets 22 of the mover 4 is set to 3: 2, The induction current of each coil 11 of each of the stators 2 and 3 with respect to the increase in the rotation speed of the mover 4 becomes sufficiently slow, so that the drive current flows more easily through each coil 11 and the mover 4 is rotated at a higher speed. Can be.

Further, the width Wm of each permanent magnet 22 is
3 is wider than the width Wi. Each of the permanent magnets 22 contributes to an increase in the rotational torque of the mover 4 as compared with each of the iron cores 23. Therefore, by increasing the width Wm of each of the permanent magnets 22, the rotational torque of the mover 4 increases.

There is no gap between each coil 11 and the iron core 12, and a pair of adjacent coils 11 are adjacent to each other.
For this reason, the lines of magnetic force of the coils 11 reach the mover 4 without passing through between the coils 11 (without drawing a small loop) and intersect (draw a large loop), and the rotational torque of the mover 4 Can be generated with higher efficiency.

In this embodiment, the stators 2 and 3 are provided on both sides of the mover 4. However, it is possible to rotate the mover 4 only by providing one stator on one side. Can be. However, when only one stator is used, the efficiency is reduced.

FIG. 7 shows a modification of the synchronous machine 1 shown in FIG. Here, a disk-shaped core is applied as the iron core 33 of the mover 4, a plurality of sector-shaped recesses 33a are formed on one end surface of the iron core 33, and a plurality of sector-shaped permanent magnets 32a are fitted into the respective recesses 33a. At the same time, a plurality of sector-shaped recesses 33b are formed in the other end surface of the iron core 33, and a plurality of sector-shaped permanent magnets 32b are fitted in the respective recesses 33b. Each permanent magnet 32
a and the permanent magnets 32b have the same magnetic poles facing each other. Further, the S pole and the N pole of each permanent magnet are alternately arranged on both end surfaces of the iron core 33.

The winding direction of each coil 11 of the stator 2 and the winding direction of each coil 11 of the stator 3 are opposite. The direction in which the drive current flows is also reversed.

In such a configuration, a loop of lines of magnetic force is formed between each coil 11 of the stator 2 and each permanent magnet 32a on one end face of the mover 4, and each coil 11 of the stator 3 and the mover A loop of lines of magnetic force is formed between the respective permanent magnets 32b on the other end surface of No.4. These loops are shown in FIG.
This is equivalent to the loop of each line of magnetic force shown in (a) to (f) and FIGS. 6B (g) to (l) divided into two at the center of the mover 4. Accordingly, the process of rotating the mover 4 is as shown in FIG.
This is substantially the same as (a) to (f) and FIGS. 6B (g) to (l).

FIG. 8 shows another modification of the synchronous machine 1 shown in FIG. Here, a disk-shaped one is applied as the iron core 43 of the mover 4. The iron core 43 is obtained by overlapping and fixing two iron core portions 43a and 43b. A plurality of sector-shaped permanent magnets 4 are provided between the iron cores 43a and 43b.
4 is embedded. On the surface of each of the iron core portions 43a and 43b, respective grooves 45 are formed on both sides of each of the permanent magnets 44. When the iron core portions 43a and 43b are viewed in plan, these grooves 45 are formed radially around the axis of the synchronous machine 1.

FIG. 9 shows a modified example of the synchronous machine 1 shown in FIG. Here, the radial dimension of the yoke portion 12 d other than the sector portion 12 c of the iron core 33 of the stator 2 is extended to both ends of the coil 11. Further, the radial dimension of the yoke portion 33d of the disc-shaped iron core 33 of the mover 4 is extended to both end edges of the coil 11, and a plurality of fan-shaped permanent magnets 32a are fixed to one end surface of the iron core 33.
A plurality of sector-shaped permanent magnets (not shown) are also provided on the other end surface of the iron core 33.
Is fixed. Other configurations are the same as those in FIG.

In such a configuration, the radial dimension of the yoke portion 12d of the iron core 12 of the stator 2 is extended to both ends of the coil 11, and the yoke portions 33d of the iron core 33 of the mover 4 are Spread out. Therefore, in order to secure required magnetic path areas for the stator 2 and the mover 4, the iron core 12 of the stator 2 and the iron core 33 of the mover 4 are provided.
Can be reduced in the axial direction, and the rotational torque of the mover 4 can be generated with higher efficiency. When the axial dimensions of the iron core 12 of the stator 2 and the iron core 33 of the mover 4 are not changed, the radial dimension of the yoke portion 12d of the iron core 12 of the stator 2 is increased to both end edges of the coil 11, and Core 3 of mover 4 of iron core 33 of mover 4
Since the radial dimension of the yoke portion 33d of the third is extended to both end edges of the coil 11, the magnetic path area can be increased,
The rotational torque of the mover 4 can be generated with higher efficiency.

FIG. 10 shows a further modification of the synchronous machine 1 shown in FIG. Here, here,
A disk-shaped core 50 of the stator 2 is applied, and includes a sector 51 around which the coil 11 is wound, and a yoke portion 52 surrounding the sector 51. The fan-shaped portion 51 is formed of a soft magnetic fired body obtained by firing a green compact. The yoke portion 52 is formed by stacking silicon steel plates in the axial direction of the stator 2, and extends the radial dimension of the yoke portion 52 to both end edges of the coil 11.

A disk-shaped iron core 55 of the mover 4 is applied, and a sector 56 to which the permanent magnet 32a is fixed is applied.
And a yoke portion 57 surrounding the sector portion 56 and the salient pole portion. This sector 56
The salient pole portion is also formed of a soft magnetic sintered body. The yoke portion 57 is formed by stacking silicon steel plates in the axial direction of the mover 4, and extends the radial dimension of the yoke portion 57 to both end edges of the coil 11. Other configurations are the same as those in FIG.

In such a configuration, the yoke portion 52 of the stator 2 and the yoke portion 57 of the mover 4 are formed of a silicon steel plate having a higher magnetic flux saturation density than the soft magnetic sintered body. Even when the sub-elements 4 are formed thin in their axial directions, the magnetic flux can easily pass therethrough, and the torque can be increased. The iron core 50 of the stator 2 and the mover 4
Although a soft magnetic fired body with a large iron loss is used for a part of the iron core 55, the yoke portion 52 and the yoke portion 57 are made of a silicon steel plate with a small iron loss, Iron loss can be reduced. Further, the soft magnetic fired body is inferior in mechanical strength, but since the yoke portions 52 and 57 are formed of a silicon steel plate having excellent mechanical strength, the mechanical strength of the iron core 50 of the stator 2 and the iron core 55 of the mover 4 is improved. be able to.

The above embodiment can be variously modified as follows. For example, the number of coils of the stator, the number of permanent magnets of the mover, and the number of iron cores can be set arbitrarily.
Further, the shapes and fixing structures of the coil, the permanent magnet, and the iron core can be arbitrarily determined. Further, the materials of the coil, the permanent magnet, the iron core and the like can be arbitrarily determined. Alternatively, each permanent magnet may be provided on the stator, and each coil may be provided on the mover.

In the modified examples shown in FIGS. 9 and 10,
The permanent magnet 32 a provided on the mover 4 may be configured so that the radial dimension of the permanent magnet 32 a extends to both ends of the coil 11. Also in this case, in order to secure required magnetic path areas for the stator 2 and the mover 4, the iron core 12 of the stator 2 and the iron core 33 of the mover 4 are provided.
Can be reduced in the axial direction, and the rotational torque of the mover 4 can be generated with higher efficiency. When the axial dimensions of the iron core 12 of the stator 2 and the iron core 33 of the mover 4 are not changed, the radial dimension of the yoke portion 12d of the iron core 12 of the stator 2 is increased to both end edges of the coil 11, and Core 3 of mover 4 of iron core 33 of mover 4
Since the radial dimension of the yoke portion 33d of the third is extended to both end edges of the coil 11, the magnetic path area can be increased,
The rotational torque of the mover 4 can be generated with higher efficiency.

[0055]

As described above, according to the present invention, according to the present invention, the second field member is formed by arranging sector-shaped permanent magnets and iron cores alternately and in a disk shape, and opposing the first field member. The magnetic pole surface of each permanent magnet is alternately magnetized to S pole and N pole. Therefore, the first
Both the force acting on each permanent magnet of the second field body in the magnetic field of each coil of the field body and the attraction force acting on each iron core of the second field body in the magnetic field cause rotational torque on the second field body. Occurs.

Since the fan-shaped permanent magnets and the iron cores are alternately arranged, the number of the permanent magnets is reduced by the number of the iron cores. For this reason, the increase in the induced current of each coil of the first field body with respect to the increase in the rotation speed of the second field body becomes gentle, and the drive current easily flows through each coil, so that the second field body can be rotated at high speed. .

Further, since the magnetic pole faces of the permanent magnets facing the first field body are alternately magnetized to S poles and N poles, the second field body based on the force acting on each permanent magnet in the magnetic field. And the rotating torque of the second field body based on the attractive force acting on each core of the second field body in the magnetic field can be generated with high efficiency.

According to one embodiment, the ratio of the number of coils to the number of permanent magnets is set to 3: 2, whereby each of the first field members with respect to an increase in the rotation speed of the second field member. It is possible to sufficiently increase the induced current of the coil,
A drive current easily flows through each coil, and the second field body can be rotated at high speed.

According to one embodiment, the width of each permanent magnet of the second field body is wider than the width of each iron core of the second field body. In this case, the increase in the rotational torque of the second field body with the increase in the width of each permanent magnet is larger than the decrease in the rotational torque of the second field body with the decrease in the width of each iron core. As a result, the rotational torque of the second field body increases.

According to one embodiment, a pair of first field bodies are arranged on both sides of the second field body, thereby generating a rotational torque of the second field body with very high efficiency. According to one embodiment, each coil is adjacent to each other. In this case, since the magnetic field lines of each coil cross the second field body without passing through between the coils, the rotational torque of the second field body can be generated with higher efficiency.

According to one embodiment, the core of the first field member, the core of the second field member, or the permanent magnet is extended to the coil edge. In this case, in order to secure a required magnetic path area, the core of the first field body, the core of the second field body, or the permanent magnet can be reduced in axial dimension.
The rotation torque of the field body can be generated with higher efficiency. Further, the core of the first field member, the core of the second field member, or the permanent magnet can have a large magnetic path area if the axial dimension is not changed, and the rotational torque of the second field member can be further increased. It can be generated with efficiency.

According to one embodiment, the iron core of the first field member or the iron core of the second field member is formed of a silicon steel plate. in this case,
Since the silicon steel sheet has a high magnetic flux saturation density, even if the first field member or the second field member is formed thin in the axial direction, the magnetic flux can easily pass therethrough, and the torque can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of an axial gap type permanent magnet synchronous machine of the present invention.

FIG. 2 is a sectional view showing the synchronous machine of FIG. 1;

FIG. 3 is a plan view showing a stator in the synchronous machine of FIG.

FIG. 4 is a cross-sectional view taken along line AA of FIG. 2 and showing each stator and mover.

FIG. 5 is a plan view showing a mover in the synchronous machine shown in FIG. 1;

FIGS. 6A to 6F are diagrams schematically showing a rotation process of a mover in the synchronous machine of the present embodiment.

FIGS. 6G to 6L are diagrams schematically showing a rotation process of the mover subsequent to FIG. 6A.

FIG. 7 is a partial sectional view showing a modification of the synchronous machine of FIG. 1;

FIG. 8 is a partial sectional view showing another modification of the synchronous machine of FIG.

FIG. 9 is a partial sectional view showing another modification of the synchronous machine of FIG. 1;

FIG. 10 is a partial sectional view showing another modification of the synchronous machine of FIG.

FIG. 11 is a perspective view showing a conventional synchronous machine.

FIG. 12 is a perspective view showing another conventional synchronous machine.

[Explanation of symbols]

Reference numeral 1: axial gap type permanent magnet synchronous machine, 2, 3: stator, 4
… Movable element, 5… axis, 6,7… bearing bearing, 8… frame, 11… coil, 12… iron core, 12d, 33d,
52, 57: yoke portion, 21: frame, 22: permanent magnet,
23: iron core, 32a: permanent magnet, 33, 50, 55: iron core.

Continuing on the front page (72) Inventor Takachi Fuji Fuji Toyota 1 Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Masaru Hirako 1 Toyota Town Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Koji Suwa 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Inventor Kazuhiro Goto 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Shigetaka Nagamatsu Toyota, Aichi Prefecture 1 Toyota Town, Toyota Motor Corporation F-term (reference) 5H621 BB01 GA01 GA04 HH01 5H622 CA02 CA06 CB01 CB04

Claims (8)

[Claims] 1. A disc-shaped first field body having a coil and a disc-shaped second field body having a magnet, and the first and second field bodies are opposed to each other with a gap provided in the axial direction. In the arranged axial gap type permanent magnet synchronous machine, the first field body has a plurality of fan-shaped coils and an iron core of each of the coils, and the fan-shaped coils are arranged in a disk shape. The second field body has a plurality of sector-shaped permanent magnets and a plurality of sector-shaped iron cores, and the sector-shaped permanent magnets and the iron cores are alternately arranged in a disk shape, and are opposed to the first field body. An axial gap type permanent magnet synchronous machine in which the magnetic pole surfaces of the permanent magnets are alternately magnetized to S poles and N poles. 2. A disk-shaped first field body having a coil and a disk-shaped second field body having a magnet, and the first and second field bodies are opposed to each other with a gap provided in the axial direction. In the arranged axial gap type permanent magnet synchronous machine, the first field body has a plurality of coils and an iron core of each of the coils, and the coils are arranged in a disk shape, and the second field body is provided. Has a plurality of permanent magnets and a plurality of iron cores, the permanent magnets and the iron cores are alternately arranged in a disk shape, and the pole face of each of the permanent magnets facing the first field member is defined as S. An axial gap type permanent magnet synchronous machine that is magnetized alternately to poles and N poles. 3. The permanent magnet synchronous machine according to claim 1, wherein the ratio of the number of the coils to the number of the permanent magnets is 3: 2. 4. The second field member in a circumferential direction of the second field member.
The permanent magnet synchronous machine according to claim 1 or 2, wherein a width of each permanent magnet of the field body is wider than a width of each iron core of the second field body in the circumferential direction. 5. The axial gap according to claim 1, wherein a pair of first field bodies is provided as the first field body, and each of the first field bodies is arranged on both sides of the second field body. Type permanent magnet synchronous machine. 6. The axial gap type permanent magnet synchronous machine according to claim 1, wherein the fan-shaped coils arranged in a disk shape are adjacent to each other. 7. The axial gap type permanent magnet according to claim 1, wherein the yoke portion of the core of the first field member, the yoke portion of the core of the second field member, or the permanent magnet is extended to the coil edge. Magnet synchronous machine. 8. The permanent magnet synchronous machine according to claim 7, wherein the core of the first field member or the core of the second field member is formed of a silicon steel plate.