JPH089610A - Permanent magnet type rotating electric machine - Google Patents

Abstract

(57) [Summary] [Object] The present invention is capable of operating from low speed to high speed rotation, realizes a high power factor and high efficiency, and is capable of operating in a high speed region when a failure occurs in which field weakening control does not operate. The purpose is to suppress the generation of excessive induced voltage. [Structure] A stator 1 which constitutes an armature by winding a coil 3 around a stator iron core 2, and a plurality of permanent magnets 6 for main field are arranged at equal intervals on a peripheral surface of a rotor iron core 7. The magnetic member 9 is arranged on the surface of the above, and the rotor 8 in which the magnet 10 made of either alnico or FeCrCo is arranged between the magnetic members 9 is characterized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables a wide range of operation from low speed to high speed rotation by effectively adjusting the interlinkage magnetic flux amount of an armature coil by a permanent magnet, and has a high power factor and high efficiency. And a permanent magnet type rotating electric machine that does not generate an excessive induced voltage even when a failure occurs in which the field weakening control does not operate in the high speed region.

[0002]

2. Description of the Related Art Generally, a permanent magnet field type rotary electric machine has a structure as shown in FIG. That is, the stator 2
1, the stator iron core 22 has a slot 25, and the armature coil 23 is arranged in the slot 25. Further, in the rotor 28, a permanent magnet 26 serving as a field is arranged and fixed on the outer peripheral surface of the rotor iron core 27.

[0003]

Since the permanent magnet type rotary electric machine uses a permanent magnet for the field, the field magnetic flux is constant. Therefore, the amount of magnetic flux interlinking with the armature coil is constant, the induced voltage increases in proportion to the rotation speed of the rotor, and the terminal voltage of the rotating electric machine also increases.

On the other hand, a motor used in an electric propulsion system such as an electric vehicle or a compressor operates at constant torque in a low speed region, but operates at constant power in a high speed region. Therefore, in the constant torque region, the terminal voltage increases substantially in proportion to the number of revolutions, but in the constant output region, the torque is small and the current may be small. Therefore, it is desirable that the voltage be close to a constant value.

However, when a permanent magnet type rotary electric machine is applied to the above system or the like, the induced voltage increases in proportion to the number of rotations in the high speed rotation region, and finally the induced voltage matches the voltage of the inverter and rotation is impossible. Becomes To enable high-speed rotation, it is sufficient to simply increase the voltage of the inverter, but the apparent power of the inverter becomes large, the inverter becomes large, and the efficiency becomes poor. Therefore, a technique (field weakening) for reducing the field magnetic flux interlinking with the armature coil by applying the armature current of the d-axis component of the armature reaction that acts in the direction opposite to the field magnetic flux is applied. However, the relative permeability of the permanent magnet is a value (1.1) close to the relative permeability of vacuum (1.0), and when the field of the rotor is seen from the armature side, the magnetic gap length is equal to the thickness of the permanent magnet. It is the sum of the mechanical void lengths, which is very large. Therefore, in order to obtain the field weakening effect, the d-axis armature current must be increased considerably, which is problematic in terms of efficiency and temperature. Further, a demagnetizing field may be directly applied to the permanent magnet itself due to the armature reaction, and the characteristics may be deteriorated (demagnetization). Further, there is a technique of covering the permanent magnet with a non-magnetic ring in order to improve the high-speed rotation resistance and prevent the permanent magnet fixed to the surface of the rotor from scattering. However, from the perspective of the permanent magnet, the sum of the thickness of the non-magnetic ring and the mechanical air gap length is the magnetic air gap length, so the magnetic air gap length is larger than that of a general rotating electrical machine, and the air gap magnetic flux density decreases and The electric machine becomes large and the efficiency becomes poor. Further, in the above system and the like, if the field weakening control fails in the high speed region, a high induced voltage of the rotating electric machine may be applied to the power element of the inverter, and the power element may be electrically destroyed.

The present invention has been made in view of the above circumstances, and enables operation over a wide range from low speed to high speed rotation.
It is also an object of the present invention to provide a permanent magnet type rotating electric machine that realizes a high power factor and high efficiency, and that does not generate an excessive induced voltage even when a failure occurs in which the field weakening control does not operate in the high speed region. .

[0007]

In order to solve the above-mentioned problems, the present invention firstly provides a stator having a stator core made of magnetic material and a coil wound around the stator core to form an armature, and a rotor core made of magnetic material. A plurality of permanent magnets for the main field are arranged at equal intervals on the circumferential surface, magnetic members are respectively arranged on the surface of the permanent magnets, and an alnico material or FeCrCo material is provided between the magnetic members. It is a gist to have a rotor in which a magnet made of any one of them is arranged.

Secondly, a stator in which a coil is wound around a stator core made of magnetic material to form an armature, and a plurality of permanent magnets for main field are arranged at equal intervals on the circumferential surface of the rotor core made of magnetic material. A magnetic member made of a silicon steel plate is arranged on the surface of each of the permanent magnets, and a rotor made of an alnico material or a FeCrCo material is arranged between the magnetic members. Is the gist.

Thirdly, a stator in which a coil is wound around a stator core made of magnetic material to form an armature, and a plurality of permanent magnets for main field are arranged at equal intervals on the circumferential surface of the rotor core made of magnetic material. And a rotor in which magnetic members made of FeCoV alloy are respectively arranged on the surfaces of the permanent magnets and magnets made of either alnico material or FeCrCo material are arranged between the magnetic members. Is the gist.

Fourthly, a stator having a stator core made of a magnetic material wound with a coil to form an armature, and a plurality of permanent magnets for the main field are equally spaced on the circumferential surface of the rotor core made of a magnetic material. A magnetic member made of a stainless steel material is arranged on the surface of the permanent magnet, and a magnet made of either an alnico material or a FeCrCo material is arranged between the magnetic members. Having it is the gist.

Fifthly, a plurality of permanent magnets for the main field are arranged at equal intervals on the circumferential surface of the stator, which is a magnetic material and has an armature formed by winding a coil around the coil. On the surface of the permanent magnet, magnetic members made of a powder magnetic core material obtained by molding a metal magnetic powder and a resin compound that also serves as insulation and bonding are respectively arranged, and between the magnetic members. The gist is to have a rotor in which a magnet made of either an alnico material or a FeCrCo material is arranged.

Sixthly, a stator having a stator core made of a magnetic material and a coil wound around it to form an armature, and a plurality of permanent magnets for main field are equally spaced on the circumferential surface of the rotor core made of a magnetic material. A magnetic member made of ferrite is arranged on the surface of the permanent magnet, and a rotor made of an alnico material or a FeCrCo material is arranged between the magnetic members. Use as a summary.

Seventh, a stator having a coil wound around a stator core made of magnetic material to form an armature, and a plurality of permanent magnets for main field are arranged at equal intervals on the circumferential surface of the rotor core made of magnetic material. A magnetic member made of an amorphous magnetic material is arranged on the surface of the permanent magnet, and a rotor made of an alnico material or a FeCrCo material is arranged between the magnetic members. That is the summary.

An eighth feature is that the magnetic member is formed by laminating thin plates. Ninth, an axial gap type permanent magnet type rotary electric machine in which a disk-shaped stator and a rotor are arranged to face each other with an appropriate gap, and an armature is constructed by winding a coil around a stator core of a magnetic material. A plurality of permanent magnets for the main field are arranged at equal intervals in the circumferential direction on a stator and a rotor core made of a magnetic material, and a magnetic member is arranged on at least the surface of the permanent magnets on the side of the air gap and the permanent magnets. Alnico or Fe between each magnet
The gist of the present invention is to have a rotor in which a magnet made of any one of CrCo materials is arranged.

[0015]

In the above structure, firstly, when the rotor is viewed from the armature, there is a magnetic member on the surface of the permanent magnet for main field of the rotor, so the magnetic air gap length becomes equal to the mechanical air gap length. The armature reaction magnetic field by the armature becomes stronger. Therefore, the effect of the field weakening due to the armature reaction is increased. Also, alnico or F arranged between the magnetic members
Since the magnet of eCrCo has a small coercive force and an extremely large residual magnetic flux density, it is easily magnetized by the magnetic field when the field weakening control is performed in the high speed region. As a result, in addition to the normal magnetic circuit of the rotor iron core-main field permanent magnet-stator iron core, the magnetic circuit of the field iron rotor-
A new magnetic circuit including a permanent magnet of the main field, a magnetic member, and a magnet such as Alnico between the poles is formed. Therefore, the magnetic flux interlinking with the armature coil is reduced, and the field weakening effectively acts also in this respect. Therefore, by performing the field weakening control in the high speed region, the terminal voltage of the rotating electric machine is lowered and the power factor and the efficient operation can be performed.

Further, in the low and medium speed regions, the magnet such as Alnico is easily magnetized by the torque current flowing through the armature, and the magnetic flux thereof is added to the magnetic flux of the permanent magnet of the main field. As a result, the magnetic flux interlinking with the armature coil is increased, and a large torque is generated with a small armature current to improve the power factor and efficiency.

Further, even when the field weakening control becomes inoperable in the high-speed region where the field weakening is performed, the magnetic flux is suppressed from suddenly increasing because the magnet such as Alnico is still magnetized. The generation of various induced voltages is prevented.

Secondly, the magnetic member arranged on the surface of the permanent magnet can be easily realized by a silicon steel plate.
Thirdly, the magnetic member arranged on the surface of the permanent magnet is made of FeCo.
FeCoV alloy is 2.3 because it is made of V alloy.
Since it has the magnetic characteristics of high saturation magnetic flux density of [T], the armature current for field weakening can be increased as compared with the case of a silicon steel plate. Therefore, it is effective when it is desired to increase the field weakening or to reduce the thickness of the magnetic member.

Fourth, the magnetic member arranged on the surface of the permanent magnet can be easily realized by using a magnetic stainless material. Fifth and sixth, when a dust core material or a ferrite material is used as the magnetic member arranged on the surface of the permanent magnet, these magnetic members have a small decrease in magnetic flux density (a decrease in magnetic permeability) even at high frequencies. Therefore, it is possible to reduce the eddy current even with an integrated body without stacking. Therefore,
When the powder magnetic core material and the ferrite material are used, it is possible to obtain a rotating electric machine having good characteristics with a simple configuration.

Seventh, the magnetic member arranged on the surface of the permanent magnet can be easily realized by using an amorphous magnetic material. Eighth, when higher efficiency is required, when the rotor rotates at high speed, when it is a multi-pole rotating electric machine, or when the armature slot is an opening slot, it is arranged on the permanent magnet surface of the main field. It is possible to reduce the eddy current by forming the magnetic member having a laminated structure of thin plates.

Ninth, also in an axial gap type permanent magnet type rotary electric machine in which a disk-shaped stator and a rotor are arranged to face each other with an appropriate gap, a magnetic member is arranged at least on the surface of the permanent magnet on the gap side. However, by arranging a magnet made of either an alnico material or a FeCrCo material between each of the permanent magnets, a wide range of operation from low speed to high speed rotation can be achieved, and high magnetism can be achieved, as in the first invention. Power factor and high efficiency are realized. Further, even when a failure occurs in which the field weakening control does not operate in the high speed region, generation of excessive induced voltage can be suppressed.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are views showing a first embodiment of the present invention. First, the configuration of the permanent magnet type rotary electric machine will be described with reference to FIG. The stator 1 has a stator iron core 2 in which silicon steel plates are laminated, and slots 5 and teeth 4 are formed alternately. The armature coil 3 is wound around the teeth 4 of the stator core 2 to form an armature. Further, the rotor core 7 of the rotor 8 is made of a magnetic material of S45C and has a cylindrical shape, and the four NdFs having different polarities on the circumferential surface thereof.
The eB rare earth permanent magnets 6 are arranged at equal intervals. The permanent magnet 6 serves as a main field of the rotating electric machine. A magnetic member 9 is arranged on the air gap side surface of the permanent magnet 6, and an alnico magnet 10 is arranged between the magnetic members 9 (between magnetic poles of the field). Examples of the material of the magnetic member 9 include a silicon steel plate, a FeCoV alloy, a magnetic stainless material, a powder magnetic core material obtained by molding a metal magnetic powder and a resin compound that also serves as insulation and bonding, ferrite, or an amorphous magnetic material. Either is used. A silicon steel plate, a magnetic stainless material, an amorphous magnetic material, or the like is formed by laminating thin plates having a thickness of about 0.5 mm. Further, as the magnets arranged between the magnetic members 9, FeCrCo magnets are used instead of the alnico magnets.

Next, the operation of the permanent magnet type rotary electric machine configured as described above will be described. In this embodiment, when the rotor 8 is viewed from the armature, the magnetic member 9 is located on the outer circumference of the field of the rotor 8, so that the magnetic gap length becomes equal to the mechanical gap length, and the armature reaction magnetic field by the armature is strong. Become. Therefore, the effect of the field weakening due to the armature reaction is great, and the high-speed rotation region can be expanded. As shown in FIG. 4, the alnico magnet 10 arranged between the field poles has a small coercive force of 58 [kA / m], which is about 1/10 to 1/20 of the coercive force of the rare earth permanent magnet 6. However, the residual magnetic flux density is 1.35 [T], which is very large. Therefore, when an armature reaction magnetic field is received, it is easily magnetized in the magnetic field direction,
Generates a large magnetic flux. When a FeCrCo magnet is used instead of an alnico magnet as a magnet arranged between the poles of the field, the FeCrCo magnet has a small coercive force of 46 [kA / m], which is 1/10 to 1/1 of the coercive force of the rare earth magnet. Although it is about / 20, the residual magnetic flux density is very large at about 1.40 [T], and the same action as that of the alnico magnet can be obtained.

Next, the operation will be described separately for the high speed region and the low speed / medium speed region. In order to perform constant output operation in the high-speed region, the induced voltage of the rotating electric machine becomes high, so field weakening control that reduces the field magnetic flux can be performed to enable operation with good power factor and efficiency. In the present embodiment, when the field weakening due to the d-axis current of the armature is performed to reduce the terminal voltage of the rotating electric machine, the alnico magnet 10 having a small coercive force is easily magnetized by the magnetic field created by the d-axis current. . From this, the magnetic circuit of the field is not only the normal magnetic circuit including the rotor core 7-NdFeB permanent magnet 6 of the main field-stator core 2 but also the rotor core 7-NdFeB of the main field as shown in the figure.
Of the permanent magnet 6-the magnetic member 9 such as a silicon steel plate and the alnico magnet 10 between the poles, a new magnetic circuit is formed. That is, since a part of the magnetic flux of the NdFeB permanent magnet 6 of the main field passes through the new magnetic circuit, the magnetic flux interlinking with the armature coil 3 is reduced, and the field weakening effectively acts. Power factor and efficiency are improved. At the same time, the demagnetization of the NdFeB permanent magnet 6 due to the armature reaction is prevented by the following action. When the armature reaction due to the d-axis current is received, part of the magnetic flux and magnetic path of the permanent magnet 6 is transferred from the stator iron core 2 to the alnico magnet 10, so that a large decrease in the permeance coefficient that determines the operating characteristics of the permanent magnet is suppressed. The permanent magnet 6 of NdFeB is magnetically stable even under an excessive armature reaction. Therefore, the permanent magnet 6 can avoid demagnetization due to armature reaction. Further, even when the field weakening control becomes inoperable in the high-speed region where the field weakening is performed, the alnico magnet 10 is still magnetized, so that the magnetic flux suddenly increases when the field weakening control is disabled and becomes excessive. It is possible to avoid destroying the power element of the inverter drive circuit by the induced voltage of the rotary electric machine.

When a large torque is required in the low speed / medium speed range, increasing the field magnetic flux enables efficient operation. The d-axis current of the armature is set to almost zero, and the q-axis current, which is the torque current, is applied to generate the torque. At the same time, the alnico magnet 10 between the poles is magnetized by the q-axis current, the magnetic flux of the main field permanent magnet 6 and the magnetic flux of the alnico magnet 10 are added as shown in FIG. 3, and the magnetic flux of the main field permanent magnet 6 is added. Since the magnetic flux leaking in the circumferential direction is almost eliminated, the magnetic flux interlinking with the armature coil increases. In particular, Alnico magnet 1
Since the residual magnetic flux density of 0 is 1.35 [T], which is the same value as that of the NdFeB magnet, the amount of magnetic flux generated by the alnico magnet 10 is also large. Therefore, a large torque is generated with a small armature current, and the power factor and efficiency are improved.

In the above operation, when the FeCoV alloy is applied to the magnetic member 9 provided on the surface of the permanent magnet 6 of the main field, the FeCoV alloy has a magnetic characteristic with a high saturation magnetic flux density of 2.3 [T]. Therefore, a d-axis current larger than that of the magnetic member of the silicon steel plate can be passed. Therefore, the effect is great when it is desired to increase the field weakening and to reduce the thickness of the magnetic member 9.

When high efficiency is required, when the rotor rotates at high speed, when it is a multi-pole rotating electric machine, or when the armature slot is an opening slot, a magnetic member provided on the surface of the permanent magnet 6 of the main field. 9 has a structure in which thin plates are laminated, so that the eddy current can be reduced. For example, 0.5 mm
When the magnetic member 9 formed by laminating and welding thick silicon steel plates in the axial direction is arranged on the surface of the NdFeB permanent magnet 6 on the gap side, the eddy current can be significantly reduced. Further, when a powder magnetic core material or a ferrite material is applied to the magnetic member 9 provided on the surface of the permanent magnet 6 of the main field, these magnetic members have a reduced magnetic flux density even at a high frequency (a reduced magnetic permeability).
However, the eddy current can be reduced even with an integrated body without stacking. Therefore, when the powder magnetic core material and the ferrite material are applied, a rotary electric machine having a simple configuration and excellent characteristics can be obtained. FIG. 5 shows the magnetic characteristics of the dust core material, and FIG. 6 shows the magnetic characteristics of the silicon steel plate, the dust core material and the ferrite material at high frequencies.

FIG. 7 shows a modification of the first embodiment. In this modification, the main field permanent magnet 6 is provided so as to be embedded in the surface portion of the rotor core 7a. The operation is almost the same as that of the first embodiment, but according to this modification, the rotor 8 can be made compact.

As described above, according to this embodiment, the amount of interlinkage magnetic flux of the armature coil by the permanent magnet 6 can be effectively adjusted, so that a wide range of operation from low speed to high speed rotation is possible. In addition, a high power factor and high efficiency are realized, and even when a failure occurs in which the field weakening control does not operate in the high speed region, an excessive induced voltage is not generated.

FIG. 8 shows a second embodiment of the present invention. This embodiment is applied to an axial gap type rotating electric machine. The armature coil 13 is wound around the stator core of the disk-shaped stator to form an armature. Similarly, the magnetic member 19 is arranged on the surface of the permanent magnet 16 of the main field on the air gap side in the disk-shaped rotor 18, and the alnico magnet 20 is arranged between the poles of the permanent magnet 16. Reference numeral 17 is a rotor iron core. The operation and effect are similar to those of the above-described radial gap type rotary electric machine that is the first embodiment.

In each of the above-mentioned embodiments, the rotating electric machine of the permanent magnet type rotating field has been described, but the permanent magnet field is used on the stator side represented by a DC motor and the rotating armature is almost the same as the above. Similar actions and effects can be obtained. Further, although the permanent magnet type rotary electric machine is described in the present embodiment, a permanent magnet type linear motor can be similarly used. Further, when priority is given to reduction of torque pulsation rather than reduction of output due to magnetic flux leakage between the surface of the field pole and the surface of the armature, the present invention can be applied to a general winding type synchronous machine.

[0032]

As described above, according to the invention described in each claim, the following effects are obtained. According to the first aspect of the invention, the stator, which is formed by winding a coil around the stator core made of magnetic material to form an armature, and the plurality of permanent magnets for main field are equally spaced on the circumferential surface of the rotor core made of magnetic material. And a magnetic member is arranged on the surface of the permanent magnet, and a magnet made of either an alnico material or a FeCrCo material is arranged between the magnetic members. , In the high speed region, the magnetic field weakening control can effectively reduce the magnetic flux interlinking with the armature coil to lower the terminal voltage of the rotating electric machine, and in the low / medium speed rotation region, the weakening field effect can reduce the armature coil. It is possible to generate a large torque with high efficiency by increasing the amount of magnetic flux interlinking with. Therefore, it is possible to operate in a wide range from low speed to high speed rotation, and it is possible to realize high power factor and high efficiency. Further, even if a failure occurs in which the field weakening control does not operate during operation in the high speed region, the magnet made of the alnico material or the FeCrCo material can keep the magnetized state, so that the magnetic flux is prevented from suddenly increasing. It is possible to prevent the generation of excessive induced voltage.

According to the second aspect of the present invention, since the magnetic member arranged on the surface of the permanent magnet is specifically made of a silicon steel plate, the effect of the first aspect of the invention can be easily and surely realized. it can.

According to the third aspect of the invention, since the magnetic member arranged on the surface of the permanent magnet is specifically made of FeCoV alloy, the FeCoV alloy has magnetic characteristics of high saturation magnetic flux density. As compared with the above case, the armature current for the field weakening can be increased, and a more excellent effect can be obtained when the field weakening is desired to be increased or the thickness of the magnetic member is desired to be reduced.

According to the invention of claim 4, since the magnetic member arranged on the surface of the permanent magnet is specifically made of a magnetic stainless material, the effect of the invention of claim 1 can be easily achieved.
It can certainly be realized.

According to the fifth aspect of the present invention, since the magnetic member arranged on the surface of the permanent magnet is specifically made of the powder magnetic core material, the magnetic powder density of the powder magnetic core material is lowered even at a high frequency (the magnetic permeability is reduced). Since the eddy current can be reduced even with an integrated body without being laminated, it is possible to realize a permanent magnet type rotary electric machine having a simple configuration and excellent characteristics.

According to the invention of claim 6, since the magnetic member arranged on the surface of the permanent magnet is made of ferrite specifically, the same effect as that of the invention of claim 5 can be obtained.

According to the invention described in claim 7, since the magnetic member arranged on the surface of the permanent magnet is specifically made of an amorphous magnetic material, the effect of the invention described in claim 1 can be easily achieved.
It can certainly be realized.

According to the eighth aspect of the present invention, since the magnetic member arranged on the surface of the permanent magnet has a structure in which thin plates are laminated, when eddy current can be reduced and higher efficiency is required, When the rotor rotates at a high speed, in the case of a multi-pole rotating electric machine, or when the armature slot is an opening slot or the like, it is possible to realize a permanent magnet type rotating electric machine having good characteristics.

According to a ninth aspect of the present invention, there is provided an axial gap type permanent magnet type rotating electric machine in which a disk-shaped stator and a rotor are arranged to face each other with an appropriate gap.
At least one of the stator, which is formed by winding a coil around a stator core made of magnetic material to form an armature, and a plurality of permanent magnets for the main field, which are arranged at equal intervals in the circumferential direction, on the rotor core made of magnetic material, are provided on at least the air gap side. Since a magnetic member is disposed on the surface of the permanent magnet and a rotor in which a magnet made of either an alnico material or a FeCrCo material is disposed between the permanent magnets, an axial gap permanent magnet is provided. Also in the rotary electric machine, substantially the same effect as the effect of the invention described in claim 1 can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a first embodiment of a permanent magnet type rotary electric machine according to the present invention.

FIG. 2 is a field weakening control d in the first embodiment.
It is a figure which shows a magnetic flux line at the time of making a shaft armature current flow into an armature coil.

FIG. 3 is a diagram showing magnetic flux lines when only the q-axis armature current is made to flow in the armature coil and strong field control is performed in the first embodiment.

FIG. 4 is a diagram showing magnetic characteristics of an alnico magnet serving as a magnetic member and an NdFeB rare earth magnet serving as a main field in the first embodiment.

FIG. 5 is a diagram showing magnetic characteristics of the dust core material in the first embodiment.

FIG. 6 is a diagram showing magnetic characteristics with respect to frequency of the silicon steel sheet, the dust core material, and the ferrite material in the first embodiment.

FIG. 7 is a cross-sectional view of essential parts showing a modified example of the first embodiment.

FIG. 8 is a perspective view of an essential part showing a second embodiment of the present invention with a part thereof cut away.

FIG. 9 is a partial cross-sectional view of a conventional permanent magnet type rotary electric machine.

[Explanation of symbols]

 1 stator 2 stator iron core 3 armature coil 6 main field permanent magnet 7, 7a rotor iron core 8 rotor 9 magnetic member 10 magnet between poles made of alnico or FeCrCo

Claims (9)

[Claims] 1. A stator comprising a stator core made of magnetic material and a coil wound around the stator core, and a plurality of permanent magnets for main field are arranged at equal intervals on the circumferential surface of the rotor core made of magnetic material. Magnetic members are arranged on the surfaces of the permanent magnets, and an alnico material or Fe is provided between the magnetic members.
A permanent magnet type rotating electric machine comprising: a rotor in which a magnet made of any one of CrCo materials is arranged. 2. A stator comprising a magnetic material stator core wound with a coil to form an armature, and a plurality of main field permanent magnets arranged at equal intervals on the circumferential surface of the magnetic material rotor iron core. A magnetic member made of a silicon steel plate is arranged on the surface of the permanent magnet, and a rotor made of an alnico material or a FeCrCo material is arranged between the magnetic members. Permanent magnet type rotating electrical machine. 3. A stator having a stator core made of a magnetic material and a coil wound around the stator core, and a plurality of permanent magnets for the main field are arranged at equal intervals on the circumferential surface of the rotor core made of a magnetic material. A magnetic member made of an FeCoV alloy is arranged on the surface of the permanent magnet, and a rotor made of an alnico material or a FeCrCo material is arranged between the magnetic members. Permanent magnet type rotating electrical machine. 4. A stator comprising a magnetic material stator iron core around which a coil is wound to form an armature, and a plurality of main field permanent magnets are arranged at equal intervals on the circumferential surface of a magnetic material rotor iron core. A magnetic member made of a magnetic stainless material is arranged on the surface of the permanent magnet, and a magnet made of an alnico material or a FeCrCo material is arranged between the magnetic members. Permanent magnet type rotating electrical machine characterized by. 5. A stator having an armature formed by winding a coil around a stator core made of magnetic material, and a plurality of permanent magnets for main field are arranged at equal intervals on the circumferential surface of the rotor core made of magnetic material. On the surface of the permanent magnet, magnetic members made of a powder magnetic core material obtained by molding a metal magnetic powder and a resin compound that also functions as an insulator and a binder are arranged, and an alnico material is provided between the magnetic members. Or a rotor in which a magnet made of any one of FeCrCo materials is arranged. 6. A stator having a stator core made of magnetic material and a coil wound around the stator to form an armature, and a plurality of permanent magnets for main field are arranged at equal intervals on the circumferential surface of the rotor core made of magnetic material. A magnetic member made of ferrite is arranged on the surface of the permanent magnet, and a rotor made of an alnico material or a FeCrCo material is arranged between the magnetic members. Permanent magnet type rotating electrical machine. 7. A stator comprising a stator core made of magnetic material and a coil wound around the stator core, and a plurality of permanent magnets for main field are arranged at equal intervals on the circumferential surface of the rotor core made of magnetic material. A magnetic member made of an amorphous magnetic material is arranged on the surface of the permanent magnet, and a rotor made of an alnico material or a FeCrCo material is arranged between the magnetic members. Characteristic permanent magnet type rotating electrical machine. 8. The permanent magnet type rotary electric machine according to claim 1, wherein the magnetic member is formed by laminating thin plates. 9. An axial gap type permanent magnet type rotating electric machine in which a disk-shaped stator and a rotor are arranged to face each other with an appropriate gap, and an armature is constructed by winding a coil around a stator core made of a magnetic material. And a plurality of permanent magnets for main field are arranged at equal intervals in the circumferential direction on a rotor core made of magnetic material, and a magnetic member is arranged on at least the surface of the permanent magnet on the side of the air gap. A permanent magnet type rotating electric machine having a rotor in which a magnet made of an alnico material or a FeCrCo material is arranged between each of the permanent magnets.