JPH10271784A - Axial air gap type permanent magnet excited synchronous machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an axial air gap type permanent magnet excited synchronous machine having high capacity in which the bearing span can be shortened even under high speed and a permanent magnet withstands centrifugal force well. SOLUTION: A sectral winding 12 is fitted in the slot 11a of a disc-like stator core 11 to form a pair of stators 13 and a disc-like rotor 15 is arranged through an axial air gap 14. Axially magnetized permanent magnets 16n, 16s are arranged while alternating the N and S poles in the circumferential direction and fixed to a rotor frame 17 thus forming a rotor 15. Flux 18 of the rotating permanent magnets 16n, 16s passes the pair of stator cores 11 through the axial air gap 14 to form a closed magnetic path which is interlinked with the winding 12 to generate an AC voltage. Since disc-like stator 13 and rotor 15 are employed through an axial air gap, the capacity of an electric machine is increased and the bearing span can be shortened even under high speed and the permanent magnets are held by the rotor frame 17 to withstand centrifugal force well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet excitation synchronous machine used as a generator or an electric motor.

[0002]

2. Description of the Related Art As a conventional permanent magnet excitation synchronous machine,
JP-A-8-140214 is known. This document is directed to a controller for adjusting the field of a synchronous machine, and the configuration of the synchronous machine targeted by the controller is as follows. 7 is a sectional view of a conventional example, FIG. 8 is a perspective view of the rotor of FIG. 7, and FIG. 9 is a partially developed view of the outer periphery of the rotor for explaining the state of the field adjustment of FIG. 7 and 8, a permanent magnet excitation synchronous machine includes an N-pole armature core 72n arranged side by side in the axial direction.
And the yoke 74 disposed over the armature core 72s on the S pole side and the armature cores 72n and 72s on the N pole side and the S pole side.
A stator 71 comprising an armature winding 73, an excitation winding 75 disposed circumferentially at a position between the armature cores 72 n and 72 s on the N-pole side and the S-pole side, and a rotor core 82.
And a plurality of N-pole permanent magnets 83n and N-pole salient pole portions 82n arranged on a rotor core surface facing the N-pole armature core 72n and alternately provided at intervals in the circumferential direction. And a plurality of magnets arranged on the rotor core surface facing the S-pole side armature core 72s and arranged at intervals in the circumferential direction and alternately arranged at an arrangement pitch deviated from the arrangement pitch of the N-pole permanent magnets 83n. S pole permanent magnet 83s
And a rotor 81 including the S pole side salient pole portion 82s. This is a radial gap type permanent magnet excitation synchronous machine with a field adjustment function.

A synchronous machine has an armature reaction, and in the case of a generator, the voltage fluctuates when a load current flows through an armature terminal. To avoid this and keep the voltage constant, the field is adjusted. FIG. 9 illustrates a state of the field adjustment, and shows a composite magnetic flux of a vector in which the magnetic flux of the permanent magnets 83n and 83s and the variable magnetic flux of the excitation winding 75 (see FIG. 7) by adjusting the DC current are superimposed. . (B) shows the magnetic flux generated by only the permanent magnets 83n and 83s when the exciting current = 0, and the armature winding 7
Each of the coil pieces 3 (see FIG. 7) cuts off the magnetic flux of one of the N-pole and the S-pole, and induces an AC voltage in the armature winding 73. 7A shows a composite magnetic flux generated by the permanent magnet and the exciting winding when the exciting current flows in the direction shown in FIG. 7, and each coil piece along the axial direction of the armature winding 73 generates a magnetic flux having a different polarity. As a result, an induced voltage in the opposite direction is generated, and the induced voltage is reduced as a whole. Demagnetization. 7C shows a combined magnetic flux generated by the permanent magnet and the exciting winding when the exciting current flows in a direction opposite to the direction shown in FIG. 7, and each coil piece along the axial direction of the armature winding 73 is the same. The magnetic flux of the pole is cut off, and an induced voltage in the same direction is generated, and the induced voltage increases as a whole. Magnetization. FIGS. 7A and 7C show the case where the amount of magnetic flux of the permanent magnet and the amount of magnetic flux of the exciting winding are the same. However, in addition to the direction of the exciting current, the magnitude of the current is adjusted to adjust the combined magnetic flux. In addition, the induced voltage can be variably adjusted.

If the rotor 81 is rotated mechanically, N and S (hereinafter, also referred to as positive and negative) for each magnetic pole can be understood without having to show a magnetic flux density diagram in the circumferential direction of the magnetic pole. The adjustable magnetic flux cuts the armature winding 73 to generate an AC voltage at the winding end, resulting in a synchronous generator. In general, a synchronous generator and a synchronous motor have the same basic principle as a synchronous machine except that the directions of conversion between electric energy and mechanical energy are reversed.

[0005]

In the above conventional example, the radial gap is cylindrical, and the armature (stator) and the rotor are usually long in the axial direction. For this reason, the capacity of the electric machine is large, and the bearing span becomes longer as the speed becomes higher, causing difficulty in the rigidity of the shaft, and it is necessary to switch from a rigid shaft to an elastic shaft. Accordingly, it is necessary to switch from a rolling bearing to a plain bearing, and it becomes necessary to consider vibration characteristics. In addition, when the permanent magnet is fixed to the rotor, it is necessary to consider separation due to centrifugal force.

An object of the present invention is to increase the capacity of an electric machine,
Another object of the present invention is to provide an axial gap type permanent magnet excitation synchronous machine in which the bearing span can be shortened even at high speeds and the permanent magnet can well withstand centrifugal force.

[0007]

According to a first aspect of the present invention, there is provided an axial gap type permanent magnet excitation synchronous machine in which a winding is applied to a disk-shaped stator core to form an A stator, and a winding side of the A stator is formed. A disk-shaped rotor is disposed through an axial gap, and permanent magnets, which are magnetized in a fan shape in the axial direction, are disposed so that N poles and S poles are alternately arranged in the circumferential direction. The rotor is fixed to the rotor frame to form a rotor, and a yoke made of a disk-shaped magnetic material is arranged on the side of the rotor opposite to the stator in the axial direction A.

According to the axial gap type permanent magnet excitation synchronous machine of the first aspect, the magnetic flux of the rotating permanent magnet passes through the stator core and the yoke through the axial gap to form a closed magnetic path, An AC voltage is generated at the winding end by interlinking with the winding. The invention 2 is the invention according to the invention 1, wherein the yoke is a B stator which forms a pair with the A stator. According to the second aspect, the axial magnetic attraction force of the two axial gaps is balanced and there is no thrust force of the bearing.

A third aspect of the present invention is the method of the first aspect, wherein the yoke is fixed to the rotor. According to invention 3, the axial gap is 1
In some places, the structure is simplified, but the magnetic attraction in the axial direction acts on the bearing. In a fourth aspect of the present invention, in the first aspect, the yoke is disposed on the fixed side via an axial gap. According to the fourth aspect, the magnetic attraction in the axial direction of the two axial gaps is balanced, so that there is no thrust force of the bearing, and the stator is integrated into one.

In the axial gap type permanent magnet excitation synchronous machine according to a fifth aspect of the present invention, the A stator is formed by applying a winding to a disk-shaped stator core, and the A stator is wound through an axial gap. A plurality of substantially sector-shaped permanent magnets magnetized in the same direction in the N- or S-pole in the same direction in the case of four or more poles, and a substantially sector-shaped magnetic material pole. Are arranged alternately in the circumferential direction and fixed to a non-magnetic rotor frame to form a rotor,
A disk-shaped magnetic yoke is disposed on the side of the rotor opposite to the stator in the axial direction of the rotor.

According to the axial gap type permanent magnet excitation synchronous machine of the fifth aspect, the magnetic flux of the rotating permanent magnet passes through the stator core, the yoke, and the pole through the axial gap to form a closed magnetic path. Then, an AC voltage is generated at the winding end by interlinking with the winding. In order to make the capacity of the electric machine the same, the same amount of the permanent magnet as that of the first embodiment is used, but the number of the permanent magnets is reduced by half.

An axial gap type permanent magnet excitation synchronous machine according to a sixth aspect of the present invention forms an A stator by applying a winding to a disk-shaped stator core, and forms an A stator on a winding side of the A stator through an axial gap. In the case of two poles, one substantially permanent magnet magnetized in the axial direction and the poles of the magnetic material in the substantially sector shape are alternately arranged in the circumferential direction. And fixed to a non-magnetic rotor frame to form a rotor, and a yoke of a disk-shaped magnetic material is disposed on the side of the rotor opposite to the A-stator in the axial direction. Invention 6
Is the same as that of the invention 5 except that the number of poles is different.

[0013] The invention 7 is the invention according to the invention 5 or 6, wherein the yoke is a B stator which forms a pair with the A stator. Invention 7 has the same effect as Invention 2. Invention 8 relates to Invention 5 or 6, wherein the yoke is fixed to the rotor. Invention 8 has the same effect as Invention 3. A ninth aspect of the present invention is the invention according to the fifth or sixth aspect, wherein the yoke is disposed on the fixed side via an axial gap. Invention 9 has the same effect as invention 4.

The tenth aspect of the present invention is the invention according to the seventh aspect, wherein the A stator and the B
The stator is connected to a fixed frame made of a magnetic material, and a field winding is arranged on the fixed frame. According to the tenth aspect, a field adjusting function is added, and the magnetic attraction in the axial direction of the gaps in both axial directions is balanced, so that there is no thrust force of the bearing. Invention 11 is Invention 9
, The yoke and the A stator are connected by a fixed frame of a magnetic material, and a field winding is arranged on the fixed frame. According to the eleventh aspect, the field adjusting function is added, the stator is integrated into one, and the magnetic attraction force in the axial direction of the gap in both axial directions is balanced, so that there is no thrust force of the bearing.

An axial gap type permanent magnet excitation synchronous machine according to a twelfth aspect of the present invention forms a pair of A stators and B stators, each of which is formed by winding a disk-shaped stator core, between the stators. A disk-shaped rotor is arranged through an axial gap, and in the case of four or more poles, a plurality of substantially sector-shaped permanent magnets magnetized with the N pole or S pole in the same direction in the axial direction and a substantially sector shape The poles of the magnetic body are alternately arranged in the circumferential direction and are fixed to the non-magnetic rotor frame to form a rotor, and the A stator and the B stator are connected by the magnetic body fixed frame. Then, a field winding is arranged on the fixed frame. The invention 12 is substantially the same as the invention 10 having four or more poles.

An axial gap type permanent magnet excitation synchronous machine according to a thirteenth aspect of the present invention forms a pair of A stators and B stators, each of which is wound around a disk-shaped stator core, between the stators. In the case of a two-pole, a disk-shaped rotor is arranged through an axial gap,
One substantially sector-shaped permanent magnet magnetized in the axial direction and poles of a substantially sector-shaped magnetic material are alternately arranged in the circumferential direction and fixed to a non-magnetic rotor frame to form a rotor. , A stator and B stator are connected by a fixed frame of a magnetic material, and a field winding is arranged on the fixed frame. Invention 13 is substantially the same as invention 10 in the case of two poles.

[0017]

1 is a perspective view of a first embodiment, FIG. 2 is a magnetic flux density diagram of a magnetic pole in a circumferential direction of FIG. 1, and FIG. 3 is a second embodiment.
4, FIG. 4 is a circumferential magnetic flux density diagram of the magnetic pole of FIG. 3, FIG. 5 is a perspective view of Example 3, and FIG. 6 is a circumferential magnetic flux density diagram of the magnetic pole of FIG. Each drawing illustrates the case of six poles, and the portions denoted by the same reference numerals in each drawing have approximately the same functions and may not be described. Also, only the electromagnetic portion is shown, and the shaft, bearings, and the like are not shown. The axial air gap is exaggerated for clarity and the stator winding is shown with only one phase, and the others are omitted.

In the first embodiment shown in FIG. 1, a pair of stators 13 are formed by applying a fan-shaped winding 12 to slots 11a of a hollow disk-shaped stator core 11 made of a laminated iron core. The winding of the left stator 13 is not shown. A disk-shaped rotor 15 is arranged on the winding side of the stator 13 via an axial gap 14. Permanent magnets 16n, 1 which are almost fan-shaped and magnetized in the axial direction
6s are arranged in the non-magnetic rotor frame 17 such that N poles (S poles viewed from the opposite side in the axial direction) and S poles (N poles viewed from the opposite side in the axial direction) are alternately arranged in the circumferential direction. Fixed rotor 1
5 is formed. The permanent magnets 16n and 16s generate a magnetic flux 18.

FIG. 2 is a magnetic flux density diagram of the magnetic poles in FIG. 1 in the circumferential direction. In each magnetic pole, N and S (positive and negative) magnetic fluxes interlink with the stator windings and the alternating current is applied to the ends of the windings 12. Generate voltage. The magnetic flux density B depends on the magnetomotive force of the permanent magnet. According to the first embodiment, the magnetic flux 18 of the rotating permanent magnets 16n and 16s is
As shown in the figure, a closed magnetic path is formed by passing through a pair of stator cores 11 through an axial gap 14, and is linked with the winding 12 to generate an AC voltage at the end of the winding 12. And although there is no field adjustment function, the stator 13 and the rotor 15
Are disk-shaped, the capacity of the electric machine is large, and the bearing span can be shortened even at high speeds.
It is well held to centrifugal force.

In the second embodiment shown in FIG. 3, the S pole of the permanent magnets 16n and 16s of the rotor 15 of the first embodiment is removed, and a sector-shaped pole 26 of a magnetic material such as a laminated silicon steel plate is fixed instead. To form the rotor 25. The permanent magnet 16n has a magnetic flux of 2
8 is generated. FIG. 4 is a magnetic flux density diagram of the magnetic poles of FIG. 3 in the circumferential direction. In each magnetic pole, N and S (positive and negative) magnetic fluxes interlink with the stator winding to generate an AC voltage at the end of the winding 12. Let it.
Since the number of permanent magnets is half, the magnetic flux density B is half that of the first embodiment depending on the magnetomotive force of the permanent magnets.

According to the second embodiment, the manner of generating an AC voltage is the same as that of the first embodiment, except that the permanent magnet 16s is replaced with the pole 26. And although there is no field adjustment function, the capacity of the electric machine is large, and the bearing span can be shortened even at high speeds, and the permanent magnet is held by the rotor frame to withstand centrifugal force well. The magnetic flux density is half that of the first embodiment. However, if the axial thickness of the permanent magnet 16n is doubled, the total amount of the permanent magnet used is the same as that of the first embodiment, and the magnetic flux density is the same as that of the first embodiment. become. Also in this case, the bearing span is slightly longer than that of the first embodiment, but can be considerably shorter than that of the radial gap type.

The point of the third embodiment shown in FIG. 5 is that a field winding and a fixed frame of a magnetic material are added to the second embodiment. In the figure, a hollow disk-shaped stator core 11 made of a laminated core
A fan-shaped winding 12 is applied to the slot 11a to form a pair of stators 13. Details of the symmetric left stator 13 are not shown. A disk-shaped rotor 25 is disposed on the winding side of the stator 13 with the axial gap 14 interposed therebetween. A substantially sector-shaped N-pole (S-pole viewed from the opposite side in the axial direction) magnetized in the axial direction and a fan-shaped pole 26 made of a magnetic material such as a laminated silicon steel plate.
Are alternately arranged in the circumferential direction, and are fixed to the non-magnetic rotor frame 17 to form the rotor 25. A pair of stators 13 are connected by a magnetic fixed frame 31 (illustrated conceptually),
The field winding 32 is arranged on the fixed frame 31. Permanent magnet 16n
Generates a magnetic flux 28, and the field winding 32 generates a variable magnetic flux 38.

FIG. 6 is a diagram of the magnetic flux density in the circumferential direction of the magnetic pole of FIG. (B) shows the permanent magnet 16n when the exciting current = 0.
A magnetic flux 28 having only a constant magnetic flux density is generated, and an AC voltage is induced in the winding 12. 5A shows that when the exciting current of the field winding 32 flows in the direction shown in FIG. 5, the variable magnetic flux 38 of the field winding 32 and the constant magnetic flux 28 of the permanent magnet 16n form one winding 12a. An induced voltage in the same direction as the coil is generated in the coil piece for each of the poles, and an increased AC voltage is induced in the winding 12. Although not shown, if the direction of the variable magnetic flux 38 in FIG. 5 is reversed, a reduced AC voltage is induced in the winding 12. In this way, by adjusting the magnitude of the current in addition to the direction of the exciting current of the exciting winding 32 in addition to the permanent magnet 26, the induced voltage can be variably adjusted.

According to the third embodiment, the rotating permanent magnet 16
The n magnetic flux 28 passes through the pair of stator cores 11 and the fixed frame 31 via the axial gap 14 to form a closed magnetic circuit, and interlinks with the winding 12 to apply an AC voltage to the end of the winding 12. generate.
Also, a variable magnetic flux 38 caused by a direct current that is variable in the direction shown in the drawing of the field winding 32 passes through the fixed frame 31, the pair of stator cores 11, and the poles 26 of the rotor 25 with low magnetic resistance. Thus, a closed magnetic circuit is formed, and is linked with the winding 12. Magnetic flux 28
An adjustable synthetic magnetic flux obtained by superposing the variable magnetic flux 38 and the variable magnetic flux 38 interlinks with the winding 12 to adjust the induced voltage variably. For this reason,
The terminal voltage can be kept constant corresponding to the load current at the end of the winding 12. Field adjustment. Further, since the stator 13 and the rotor 15 are disk-shaped in the axial direction, the capacity of the electric machine is large, the bearing span can be shortened even at high speed, and the permanent magnet is held by the rotor frame 17. To withstand centrifugal force.

A modification of the embodiment will be described. In any of the embodiments, the pair of stators 13 can be called an A stator and a B stator. Instead of one stator, a disk-shaped magnetic yoke may be fixed to the rotor on the side opposite to the stator in the axial direction of the rotor. Instead of one stator, a disk-shaped magnetic yoke may be disposed on the fixed side of the rotor via the axial gap on the side opposite to the stator in the axial direction. In this specification, the yoke of one of the stator and the rotor or the yoke of the fixed side is called a yoke. When the yoke is fixed to the rotor, the magnetic attraction in the axial direction acts on the bearing, and the other two have no axial thrust in the bearing because the magnetic attraction in the axial direction of the two axial gaps is balanced. Although the description has been made with six poles, the present invention can be applied to two or more poles. In the case of two poles, one substantially sector-shaped permanent magnet magnetized in the axial direction and one substantially sector-shaped magnetic pole are substantially semicircular. A semicircle is also called a fan shape. Example 1
Alternatively, a field winding and a fixed frame of a magnetic material can be added to the second embodiment.

In each embodiment, the stator core 11
It is desirable to use a laminated core to prevent eddy currents. The stator core having the illustrated slots is formed by winding a single long strip in tight contact with a spiral, but several tens of relatively short strips are wound. It is also known that a plate is wound in close contact with a spiral. As the winding of the stator, a known winding method such as a lap winding can be used in addition to the concentrated concentric winding shown. Rotor frame 17 of rotor 15 or 25
It is convenient in terms of centrifugal force to divide the magnet into two pieces and pack permanent magnets and fan-shaped poles between them. Although the fixing frame 31 in FIG. 5 is a conceptual diagram, it may have a structure similar to an ordinary frame or bracket made of a magnetic material.

[0027]

According to the axial gap type permanent magnet excitation synchronous machine of the first aspect, the magnetic flux of the rotating permanent magnet passes through the stator core and the yoke through the axial gap to form a closed magnetic path. And
Since the AC voltage is generated at the winding end by interlinking with the winding, the effect is that the capacity of the electric machine is large, the bearing span can be shortened even at high speeds, and the permanent magnet can withstand centrifugal force well. is there.

According to the second aspect of the invention, there is an effect that the axial magnetic attraction of the gaps in both axial directions is balanced and the thrust of the bearing is eliminated. According to the third aspect, there is an effect that the structure is simplified because the axial gap is provided at one place. According to the fourth aspect, there is an effect that the magnetic attraction in the axial direction of the two axial gaps is balanced, there is no thrust force of the bearing, and the stator is integrated into one.

According to the axial gap type permanent magnet excitation synchronous machine of the invention 5 or 6, the magnetic flux of the rotating permanent magnet passes through the stator core, the yoke and the pole through the axial gap to close the magnet. Since a path is formed and an AC voltage is generated at the winding end by interlinking with the winding, the same amount of the permanent magnet as in Invention 1 is used in order to make the capacity of the electric machine the same. Has the effect of reducing the number by half.

According to the seventh aspect of the invention, there is an effect that the axial magnetic attraction force of the two axial gaps is balanced and the thrust force of the bearing is eliminated. According to the eighth aspect, there is an effect that the structure is simplified because the axial gap is provided at one place. According to the ninth aspect, there is an effect that the axial magnetic attraction forces of the two axial gaps are balanced, there is no thrust force of the bearing, and the stator is integrated into one.

According to the axial gap type permanent magnet excitation synchronous machine of the tenth aspect, a field adjusting function is added, and the axial magnetic attraction force of both axial gaps is balanced and there is no thrust force of the bearing. There is. According to the axial gap type permanent magnet excitation synchronous machine of the eleventh aspect, the field adjusting function is added, the stator is integrated into one, and the magnetic attraction force in the axial direction of both axial gaps is balanced and the bearing is There is an effect that there is no thrust force.

According to the axial gap type permanent magnet excitation synchronous machine of the twelfth aspect, the effects of the fifth, seventh and tenth aspects are obtained.
Since the magnetic flux of the rotating permanent magnet passes through the stator core, the yoke, and the pole through the axial gap to form a closed magnetic path, and interlinks with the winding to generate an AC voltage at the winding end. In order to make the capacity of the electric machine the same, the same amount of the permanent magnet as that of the first embodiment is used, but the effect is that the number of the permanent magnets is halved. Are balanced to eliminate the thrust force of the bearing, a field adjusting function is added, and the magnetic attraction force in the axial direction of the gap in both axial directions is balanced to eliminate the thrust force of the bearing.

According to the axial gap type permanent magnet excitation synchronous machine of the thirteenth aspect, the effects of the sixth, seventh and tenth aspects are obtained.
The same effect as that of the twelfth aspect is obtained only by changing the number of poles.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a magnetic flux density diagram of a magnetic pole in a circumferential direction of FIG. 1;

FIG. 3 is a perspective view of a second embodiment.

FIG. 4 is a magnetic flux density diagram in the circumferential direction of the magnetic pole of FIG. 3;

FIG. 5 is a perspective view of a third embodiment.

6 is a magnetic flux density diagram of the magnetic pole in the circumferential direction of FIG. 5;

FIG. 7 is a sectional view of a conventional example.

FIG. 8 is a perspective view of the rotor of FIG. 7;

FIG. 9 is a partial development view of the outer periphery of the rotor for explaining the state of the field adjustment of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Stator core 11a Slot 12 Winding 13 Stator 14 Axial gap 15 Rotor 16n Permanent magnet 16s Permanent magnet 17 Rotor frame 18 Magnetic flux 26 pole 28 Magnetic flux 31 Fixed frame 32 Field winding 38 Variable magnetic flux

Claims (13)

[Claims] An A stator is formed by applying a winding to a disk stator core, and a disk rotor is disposed on the winding side of the A stator through an axial gap. A fan-shaped, permanent magnet that is magnetized in the axial direction is arranged so that the N and S poles are alternately arranged in the circumferential direction, and is fixed to a non-magnetic rotor frame to form a rotor. An axial gap type permanent magnet excitation synchronous machine, wherein a yoke made of a disk-shaped magnetic material is arranged on the side opposite to the stator A. 2. An axial gap type permanent magnet excitation synchronous machine according to claim 1, wherein the yoke is a B stator paired with the A stator. . 3. An axial gap type permanent magnet excitation synchronous machine according to claim 1, wherein a yoke is fixed to the rotor. 4. An axial gap type permanent magnet excitation synchronous machine according to claim 1, wherein the yoke is disposed on the fixed side via the axial gap. 5. An A stator is formed by winding a disc-shaped stator core, and a disc-shaped rotor is disposed on the winding side of the A stator through an axial gap. In the case of more than poles, a plurality of substantially sector-shaped permanent magnets in which the N pole or S pole is magnetized in the same direction in the axial direction and the poles of the magnetic material in a substantially sector shape are arranged alternately in the circumferential direction. An axial gap type permanent magnet, wherein the rotor is fixed to a non-magnetic rotor frame to form a rotor, and a yoke made of a disk-shaped magnetic material is disposed on the side of the rotor opposite to the stator in the axial direction. Magnet excitation synchronous machine. 6. A stator is formed by winding a disc-shaped stator core, and a disc-shaped rotor is disposed on the winding side of the A stator through an axial gap. In the case of poles, one substantially sector-shaped permanent magnet magnetized in the axial direction and the poles of a substantially fan-shaped magnetic material are alternately arranged in the circumferential direction and fixed to a non-magnetic rotor frame. To form a rotor, and the anti-A
An axial gap type permanent magnet excitation synchronous machine characterized in that a disk-shaped magnetic yoke is arranged on the stator side. 7. An axial gap type permanent magnet excitation according to claim 5 or 6, wherein the yoke is a B stator paired with the A stator. Synchronous machine. 8. An axial gap type permanent magnet excitation synchronous machine according to claim 5 or 6, wherein a yoke is fixed to the rotor. 9. An axial gap type permanent magnet excitation synchronous machine according to claim 5 or 6, wherein the yoke is arranged on the fixed side via the axial gap. Machine. 10. An axial gap type permanent magnet excitation synchronous machine according to claim 7, wherein the A stator and the B stator are connected by a fixed frame of a magnetic material, and a field winding is arranged on the fixed frame. An axial gap type permanent magnet excitation synchronous machine characterized by the above. 11. The synchronous machine according to claim 9, wherein the yoke and the A stator are connected by a fixed frame of a magnetic material, and a field winding is arranged on the fixed frame. An axial gap type permanent magnet excitation synchronous machine characterized by the following. 12. A pair of A- and B-stators, each having a winding wound around a disk-shaped stator core, formed between the two stators with an axial gap therebetween. In the case of four or more poles, a plurality of substantially sector-shaped permanent magnets in which the N pole or S pole is magnetized in the same direction in the axial direction and the poles of the magnetic material in the substantially sector shape are alternately arranged in the circumferential direction. And fixed to a non-magnetic rotor frame to form a rotor, the A stator and the B stator are connected by a magnetic fixed frame, and a field winding is disposed on the fixed frame. An axial gap type permanent magnet excitation synchronous machine characterized in that: 13. A disk-shaped rotor having a pair of A- and B-stators formed by winding a disk-shaped stator core and having an axial gap between the two stators. In the case of two poles, a non-magnetic material is provided by arranging one substantially sector-shaped permanent magnet magnetized in the axial direction and the poles of the substantially sector-shaped magnetic material alternately in the circumferential direction. A rotor is fixed to the rotor frame to form a rotor.
An axial gap type permanent magnet excitation synchronous machine characterized in that a stator and a B stator are connected by a fixed frame of a magnetic material, and a field winding is arranged on the fixed frame.