JPH07147745A - Motor - Google Patents

Abstract

PURPOSE:To reduce the short-circuits of field fluxes in armature salient poles without increasing the flux density in the gap parts between the armature salient poles and the field magnets by a method wherein diamagnetic material members are provided on the side edge parts of the plane of the armature salient poles which face the field magnets. CONSTITUTION:A rotor 21 is composed of a core 4 made of soft magnetic material and field magnets 1. On the other hand, and armature 22 is made from a bulk material or laminated steel plates and has six armature salient poles 2. Diamagnetic material members 5 made of silver are provided on the side edge parts of the planes of the armature salient poles 2 which face the field magnets 1. With this constitution, the short-circuits of fluxes in the armature salient poles can be reduced, so that a high efficiency motor can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a salient pole type concentrated winding type electric motor having an armature made of a bulk material of soft magnetic material or a laminated steel sheet and a field magnet.

[0002]

2. Description of the Related Art In recent years, there has been a strong need for downsizing and weight reduction of electric motors including FA devices and electric motors mounted in automobiles. For example, in the case of FA equipment, there is a strong need for downsizing and weight saving because the mounting space is limited and the electric motor itself is the target to be driven by another actuator. In addition, with regard to in-vehicle actuators, reduction of vehicle weight has become an issue in order to reduce fuel consumption of automobiles, and each component is also required to be lightweight. As described above, downsizing and weight reduction of electric motors are technologies desired in various industrial fields.

In such a situation, a salient pole type concentrated winding method can be mentioned as a motor structure suitable for downsizing and weight reduction of an electric motor. The salient pole type concentrated winding method is a method in which winding is performed for each armature salient pole, and is different from the distributed winding method in which several armature salient poles are collectively wound. . The salient pole-type concentrated winding method is characterized by the fact that the total conductor length can be shortened and the coil end height can be reduced even if the number of coil conductors (number of turns) is the same. In addition, it is possible to reduce the size and weight of the electric motor.
It also has a feature that the copper loss of the electric motor is small because the winding resistance is small. On the other hand, however, in the salient pole type concentrated winding method, the magnetic flux of the field magnet in the salient pole portion of the armature is short-circuited, and the reduction of the effective magnetic flux passing through the inside of the armature cannot be avoided. Therefore, in the salient pole type concentrated winding type electric motor, it is difficult to obtain a sufficient effective magnetic flux, so that it is difficult to increase the torque and efficiency of the electric motor.

On the other hand, as a conventional technique for solving the above-mentioned problems, for example, as shown in a document "Designing and Characteristic Calculation Method of Permanent Magnet Magnetic Circuit" (written by Mitsuyoshi Okawa), the surface facing the armature salient pole is It has been proposed to design the relationship between the spread angle of one pole of the field magnet and the spread angle of one armature salient pole facing the field magnet to an appropriate value. FIG. 14 is a front view showing the upper half of a conventional salient pole concentrated winding type electric motor, which is composed of a rotor 21 and an armature 22. In the conventional example of FIG. 14, the field magnet 1 has 4 poles and the armature salient pole 2 has 6 poles.
The armature winding 3 is wound around the armature salient pole 2 by a concentrated winding method. Further, an example of an inversion type DC brushless motor in which the field magnet 1 rotates will be shown.

As shown in FIG. 14, the spread angle of one pole of the field magnet 1 on the surface facing the armature salient pole 2 is ψm (radian), and the armature salient pole facing the field magnet 1 is shown. The spread angle of one of the two is ψe (radian). Further, the pole arc rate αm of the field magnet is used as a parameter indicating the spread angle ratio of the field magnet 1, and the pole arc ratio of the armature salient pole is used as a parameter indicating the spread angle ratio of one armature salient pole. When αe is defined, the pole arc rate αm of the field magnet and the pole arc rate αe of the armature salient pole are set to values satisfying the relationship shown in the following formula 1, whereby the armature salient of the field magnet is set. It is stated that a design with few shorts at the poles is possible.

Αm = 0.66 to 1.0 αe = 0.5 × αm (Equation 1) Here, αm = ψm × p / π αe = ψe × p / π p: number of pole pairs When there is a pole arc rate αe of the salient salient poles and a pole arc rate αm of the field magnets, the spread angle of the armature salient poles 2 is about half of the spread angle of the field magnets 1. Short circuits of magnetic flux in the armature salient pole portion between the magnets are reduced.

[0007]

However, in the case where the opening angle αe of the armature salient poles and αm of the field magnets are within the range that satisfies the above expression 1, that is, when the opening angle of the armature salient poles is designed to be small. However, the magnetic flux of the field magnet is always short-circuited in the armature salient pole portion, and the amount of effective magnetic flux passing through the inside of the armature is reduced. FIG. 15 is a diagram modeling the flow of magnetic flux in the vicinity of the armature salient poles. The armature salient poles 2 and the field magnet 1 are shown in FIG.
It consists of The armature salient poles 2 and field magnets 1 shown in the figure are within the range of design values shown in the relational expression of the prior art regarding the pole arc rate αe of the armature salient poles and the pole arc rate αm of the field magnets. ing. It can be seen that when the armature salient poles 2 and the field magnet 1 are in the positional relationship shown in the figure, the flow 6 of the magnetic flux enters the inside of the armature and becomes an effective magnetic flux. However, when the rotor rotates and the positions of the field magnet and the armature salient pole change relatively, the flow of magnetic flux changes. FIG. 16 is a diagram modeling the flow of magnetic flux in the vicinity of the armature salient poles, which is composed of the armature salient poles 2 and the rotor 21. As for the positional relationship between the armature salient poles 2 and the field magnets 1, the armature salient poles 2 are located between the different poles of the field magnets 1. That is, as shown by the magnetic flux flow 10, the magnetic flux of the field magnet 1 is short-circuited at the armature salient poles 2, and there is almost no effective magnetic flux entering the inside of the armature. FIG. 17 is a relationship diagram between the rotation angle of the rotor and the effective magnetic flux amount, and is a diagram showing a change in the effective magnetic flux amount passing through the armature salient poles with the rotation angle of the field magnet. In the figure, the broken line theoretically indicates the effective magnetic flux amount passing through the armature salient poles, and the solid line indicates the effective magnetic flux amount passing inside the armature. That is, theoretically, the position state of the rotor 21 is as shown in FIG.
The effective magnetic flux amount passing through the armature when rotated from the position shown in 4 is that the armature salient pole 2 is not located between the poles of the field magnet until the rotation angle of the field magnet is θ (radian). To
It is possible to obtain a constant effective magnetic flux. Here, the rotation angle θ (radian) of the rotor 1 is the spread angle ψm of the field magnet.
(Radian) and the armature salient pole spread angle ψe (radian) are shown as half the difference. Further, when the rotation angle of the field magnet is within the range of θ to (π / 2p) (radian), the effective magnetic flux flowing into the armature due to the short circuit magnetic flux of the field magnet at the armature salient pole 2 is generated. The effective magnetic flux becomes zero when the armature salient poles 2 are gradually reduced and are located in the middle of the field magnets of different poles, that is, when the rotation angle becomes (π / 2p) (radian). Further, the amount of effective magnetic flux actually passing through the armature salient poles is smaller than the theoretical effective magnetic flux. That is, the magnetic flux flow 10 shown in FIG. 16 is bent because the magnetic permeability of the armature salient pole 2 is significantly higher than the magnetic permeability in the air, and the armature salient pole 2 is bent in the rotational direction of the rotor. It can be seen that a transverse magnetic flux is generated and a large magnetic flux is short-circuited. Therefore, it is understood that a larger short circuit than the theoretical short circuit is generated and the effective magnetic flux amount cannot be sufficiently obtained. In addition, by designing the spread angle of the armature to be smaller,
Short circuit in the armature salient pole of the magnetic flux of the field magnet is reduced,
Although it is clear that the amount of effective magnetic flux increases, the magnetic flux density in the gap portion between the armature salient poles and the field magnet increases, so that coking increases and stable driving cannot be ensured.

Therefore, the present invention solves the problems of the prior art. The object of the present invention is to provide a salient pole type concentrated winding type electric motor suitable for downsizing and weight saving, and to reduce the contact between the armature salient pole and the armature salient pole. An object of the present invention is to provide an electric motor capable of reducing the short circuit of the field magnet in the armature salient poles and increasing the efficiency and torque without increasing the magnetic flux density in the gap with the magnet for magnet.

[0009]

In a salient pole type concentrated winding type motor having an armature made of a bulk material of soft magnetic material or a laminated steel plate and a field magnet, the armature is opposed to the field magnet. It is characterized in that a member made of a diamagnetic material is provided on a side edge portion of the salient pole.

The present invention is characterized in that it serves as both a member made of a diamagnetic material and a member for fixing the winding, which is provided on the side edge portion of the armature salient pole facing the field magnet.

In a salient pole concentrated winding type electric motor having an armature made of a bulk material of soft magnetic material or a laminated steel plate and a field magnet, a transparent member in a direction facing the field magnet of the armature core is provided. It is characterized in that the magnetic susceptibility and the magnetic permeability in the circumferential direction of rotation of the rotor have anisotropy.

A laminated steel sheet made of a soft magnetic material is used for the armature core, and the laminated steel sheets are laminated in the armature salient pole portion in the circumferential direction in which the rotor rotates.

In a salient pole type concentrated winding type electric motor having an armature made of a bulk material of soft magnetic material or laminated steel plates and a field magnet, a salient pole of the armature is slit in a direction facing the field magnet. It is characterized in that a (groove) is provided.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an electric motor showing an embodiment of the present invention, which is composed of a rotor 21 and an armature 22. In this embodiment, a detailed description will be given of an example in which a member made of a diamagnetic material is provided at a side edge portion of an armature salient pole facing a field magnet. Further, in the present embodiment, a detailed description will be given by taking as an example an inversion type DC brushless motor in which the field magnet is located at the center of the electric motor and the field magnet rotates.

The rotor 21 is composed of a core 4 made of a soft magnetic material and a field magnet 1. In this embodiment, the field magnet 1 is magnetized to have four poles, and N poles and S poles are alternately generated at equal intervals along the circumferential direction. The armature 22 is made of a bulk material of soft magnetic material or a laminated steel plate, and has six armature salient poles 2. A motor winding 3 is applied to each armature salient pole 2 by a concentrated winding method. For driving the electric motor, a magnetic pole detection device (for example, a Hall element, not shown) that detects the rotor position, or the position of the rotor 21 is detected by sensorless driving, and an appropriate drive phase is excited.
As a result, the rotor 21 rotates in the required direction.

Next, the effect of the member 5 made of a diamagnetic material will be described in detail. A diamagnetic material is a substance that is polarized in a direction opposite to the magnetized direction.
(Gold), Ag (silver), P (phosphorus), etc. are known. The armature salient pole 2 of the present invention is provided with a diamagnetic material member 5 made of Ag (silver) at the side edge portion of the surface facing the field magnet 1. FIG. 2 shows a modeled flow of magnetic flux near the armature salient poles in this embodiment. FIG. 2 comprises armature salient poles 2, field magnets 1 and lines 10 showing the flow of magnetic flux. When the armature salient pole 2 shown in FIG. 16 is on or near the boundary between different poles of the field magnet 1,
The flow of magnetic flux easily passes through the armature salient poles 2 to cause a short circuit. However, in the structure of the armature salient pole according to the present invention,
Since the diamagnetic material member 5 made of silver (Ag) has magnetism in the direction opposite to the magnetization direction, that is, the direction of the short circuit of the magnetic flux, the short circuit of the magnetic flux is suppressed. Therefore, the short circuit magnetic flux becomes small as shown in FIG.

FIG. 3 is a diagram showing the relationship between the rotation angle of the rotor and the amount of effective magnetic flux flowing into the armature in this embodiment.
The solid line in the figure shows the amount of magnetic flux actually flowing into the armature, and the broken line theoretically shows the amount of effective magnetic flux flowing into the armature. That is, by providing the diamagnetic material member 5 on the side edge portion of the surface facing the field magnet 1, the magnetic flux that becomes ineffective by short-circuiting the armature salient pole portion 2 is reduced, and in a form close to the theoretical state. It is understood that it is possible to obtain an effective magnetic flux. Therefore, the electric motor in this embodiment can obtain a sufficient effective magnetic flux.

In this embodiment, the diamagnetic material is Ag.
Although an example using (silver) is shown, it is clear that the same effect can be obtained with other diamagnetic materials such as Au (gold), P (phosphorus), and superconducting materials.

FIG. 4 is a front view of an electric motor showing a second embodiment of the present invention, which is composed of a rotor 21 and an armature 22. In the present embodiment, an example in which a member made of a diamagnetic material made of Ag (silver) is provided on the side edge portion of the armature salient pole facing the field magnet, and the member also serves as the winding fixing member Give a detailed explanation. Further, in the present embodiment, a detailed description will be given by taking an inversion type DC brushless motor in which the field magnet is located at the center of the motor and the field magnet rotates.

The rotor 21 is composed of a core 4 made of a soft magnetic material and a field magnet 1. In this embodiment, an example in which four poles are magnetized is shown, and the N pole S is evenly spaced along the circumferential direction.
The poles alternate. The armature 22 is made of a bulk material of soft magnetic material or a laminated steel plate, and has six armature salient poles 2. A motor winding 3 is applied to each armature salient pole 2 by a concentrated winding method. The drive of the electric motor detects the position of the rotor 21 by a magnetic pole detection device (for example, a Hall element, not shown) that detects the rotor position, or the sensorless drive, and the appropriate electric motor winding is excited, which causes the rotor 21 to move. Rotate in the desired direction.

Next, the effect of the member 5 made of a diamagnetic material will be described in detail. The armature salient pole 2 in the present invention is provided with a diamagnetic material member 5 made of Ag (silver) so as to pass the side edge portions of the adjacent armature salient poles. Therefore, the diamagnetic material 5 also serves as a winding fixing member for preventing the motor winding 3 from protruding from the winding space. FIG. 5 shows a diagram modeling the flow of magnetic flux near the armature salient poles in this embodiment. FIG. 5 shows armature salient poles 2, field magnets 1 and lines 6 showing the flow of magnetic flux.
Consists of. As shown in FIG. 16, when the armature salient poles 2 are on or near the boundary between different poles of the field magnet 1, the flow of magnetic flux easily passes through the armature salient poles 2 and is easily short-circuited. However, in the structure of the armature salient pole according to the present invention, since the diamagnetic material member 5 made of silver (Ag) is magnetized in the direction opposite to the magnetization direction, that is, the direction in which the magnetic flux is short-circuited, the magnetic flux short-circuit is suppressed. Therefore, the short circuit magnetic flux becomes small as shown in FIG.

Therefore, the diagram showing the relationship between the rotation angle of the rotor and the amount of effective magnetic flux flowing into the armature is the same as the diagram shown in the first embodiment and becomes the diagram shown in FIG. That is, by providing the diamagnetic material member 5 on the side edge portion of the surface facing the field magnet 1, the magnetic flux that becomes ineffective by short-circuiting the armature salient pole portion 2 is reduced, and in a form close to the theoretical state. It is understood that it is possible to obtain an effective magnetic flux. Further, in the present embodiment, the diamagnetic material member 5 also serves as a fixing member for preventing the electric motor winding from protruding from the winding space, so that the electric motor winding is surely placed in the electric motor winding space. You can see that it is retained. Therefore, the electric motor according to the present embodiment can obtain a sufficient effective magnetic flux, and the electric motor winding can be reliably held.

In this embodiment, the diamagnetic material is Ag.
Although an example using (silver) is shown, it is clear that the same effect can be obtained with other diamagnetic materials such as Au (gold), P (phosphorus), and superconducting materials.

FIG. 6 is a front view of an electric motor showing a third embodiment of the present invention, which is composed of a rotor 21 and an armature 22. In the present embodiment, the material of the armature salient poles is a material having anisotropy in the magnetic permeability in the direction facing the field magnet of the armature and the magnetic permeability in the circumferential direction in which the rotor rotates. The example used will be described in detail. Further, in the present embodiment, a detailed description will be given by taking as an example an inversion type DC brushless motor in which the field magnet is located in the central portion of the electric motor and the field magnet rotates.

The rotor 21 is composed of a core 4 made of a soft magnetic material and a field magnet 1. In this embodiment, an example in which four poles are magnetized is shown, and the N pole S is evenly spaced along the circumferential direction.
The poles alternate. The armature 22 is made of a soft magnetic material and has six armature salient poles 2. A motor winding 3 is applied to each armature salient pole 2 by a concentrated winding method. The motor is driven by a magnetic pole detection device (for example, a Hall element, not shown) that detects the rotor position, or the position of the rotor 21 is detected by sensorless drive, and an appropriate drive winding is excited, which causes the rotor 21 to move. Rotate in the desired direction.

Next, the anisotropy armature iron core of the armature salient poles, that is, the magnetic permeability in the direction facing the field magnets of the armature salient poles and the magnetic permeability in the circumferential direction in which the rotor rotates. A detailed description will be given of an example in which is anisotropic. FIG. 7 shows a diagram modeling the flow of magnetic flux near the armature salient poles in this embodiment. FIG. 7 is composed of armature salient poles 2, field magnets 1 and lines 6 showing the flow of magnetic flux. As shown in FIG. 16, when the armature salient poles 2 are on or near the boundary between different poles of the field magnet 1, the flow of magnetic flux easily passes through the armature salient poles 2 and is easily short-circuited. However, as shown in the present embodiment, the magnetic permeability of the armature salient poles is made anisotropic by the magnetic permeability in the direction facing the field magnet and the magnetic permeability in the circumferential direction in which the rotor rotates. Is used, that is, by reducing the magnetic permeability in the circumferential direction of the armature salient pole 2, it becomes difficult for the magnetic flux to flow in the rotational direction of the rotor as shown in FIG.

Therefore, the diagram showing the relationship between the rotation angle of the rotor and the amount of effective magnetic flux flowing into the armature is the same as the diagram shown in the first embodiment and becomes the diagram shown in FIG. That is, by making the magnetic permeability of the armature salient poles anisotropy between the magnetic permeability in the direction facing the field magnet and the magnetic permeability in the circumferential direction in which the rotor rotates, the armature salient poles 2 are short-circuited. Thus, it is understood that the ineffective magnetic flux is reduced and the effective magnetic flux can be obtained in a form close to the theoretical state.

FIG. 8 is a diagram showing a structural example of the magnetic anisotropic material used in this embodiment. The armature salient pole shown in FIG. 8 is composed of iron powder 7, epoxy resin 8, and glass fiber layer 9. Since the non-magnetic glass fiber layer is formed in the vertical direction, this material has a small magnetic permeability in the horizontal direction and becomes an anisotropic material. Therefore, by using the anisotropic material, it is possible to increase the effective magnetic flux amount of the electric motor.

In this embodiment, an example of the iron powder 7, the epoxy resin 8 and the glass fiber layer 9 is shown, but the present invention is not limited to this, and the magnetic permeability and the rotation in the direction facing the field magnet are not limited thereto. It goes without saying that the same effect can be obtained as long as the material has anisotropy in the magnetic permeability in the circumferential direction of rotation of the child.

FIG. 9 is a front view of an electric motor showing a fourth embodiment of the present invention, which is composed of a rotor 21 and an armature 22. In this embodiment, a laminated steel sheet made of a soft magnetic material is used for the armature core, and the laminated steel sheet is laminated in the circumferential direction in which the rotor is rotated in the armature salient pole portion. Perform. Further, in the present embodiment, a detailed description will be given by taking as an example an inversion type DC brushless motor in which the field magnet is located in the central portion of the electric motor and the field magnet rotates.

The rotor 21 is composed of a core 4 made of a soft magnetic material and a field magnet 1. In this embodiment, an example in which four poles are magnetized is shown, and the N pole S is evenly spaced along the circumferential direction.
The poles alternate. The armature 22 is made of a soft magnetic material and has six armature salient poles 2. A motor winding 3 is applied to each armature salient pole 2 by a concentrated winding method. The motor is driven by a magnetic pole detection device (for example, a Hall element, not shown) that detects the rotor position, or the position of the rotor 21 is detected by sensorless drive, and an appropriate drive winding is excited, which causes the rotor 21 to move. Rotate in the desired direction.

Next, a detailed description will be given of the effect of using a laminated steel sheet made of a soft magnetic material for the armature core and further laminating the laminated steel sheets in the armature salient pole portion in the circumferential direction in which the rotor rotates. Do it. FIG. 10 is a structural diagram of the armature salient pole of the present invention. The generally well-known laminated structure of the armature salient poles is laminated in the longitudinal direction of the electric motor, but the armature salient poles of the present invention are laminated in the circumferential direction in which the rotor rotates. Therefore, the magnetic permeability in the circumferential direction of rotation of the rotor in the armature salient pole is smaller than the magnetic permeability in the direction facing the field magnet, and thus has anisotropy. Further, the laminated steel plates are formed in a U shape as shown in the figure, and at the time of assembly, an armature can be easily configured by combining the U-shaped members 11 in the same number as the number of armature salient poles. It is possible.

Next, FIG. 11 shows a modeled flow of magnetic flux in the vicinity of the armature salient poles in this embodiment. FIG. 11 is composed of armature salient poles 2, field magnets 1 and lines 6 showing the flow of magnetic flux. As shown in FIG. 16, when the armature salient poles 2 are on or near the boundary between different poles of the field magnet 1, the flow of magnetic flux easily passes through the armature salient poles 2 and is easily short-circuited. However, as shown in the present embodiment, since the magnetic permeability in the circumferential direction of rotation of the rotor in the armature salient pole portion is smaller than the magnetic permeability in the direction facing the field magnet,
The flow of magnetic flux becomes difficult to flow in the rotation direction of the rotor as shown in FIG.

Therefore, the diagram showing the relationship between the rotation angle of the rotor and the amount of effective magnetic flux flowing into the armature is the same as the diagram shown in the first embodiment and becomes the diagram shown in FIG. That is, by stacking the stacking directions of the steel plates of the armature salient poles in the circumferential direction in which the rotor rotates, the magnetic flux that becomes ineffective by short-circuiting the armature salient poles 2 is reduced, and in a form close to the theoretical state. It is understood that it is possible to obtain an effective magnetic flux.

FIG. 12 is a front view of an electric motor according to the fifth embodiment of the present invention, which is composed of a rotor 21 and an armature 22. In the present embodiment, an example in which a slit (groove) is provided in the armature salient pole in a direction facing the field magnet will be described in detail. Further, in the present embodiment, a detailed description will be given by taking as an example an inversion type DC brushless motor in which the field magnet is located in the central portion of the electric motor and the field magnet rotates.

The rotor 21 is composed of a core 4 made of a soft magnetic material and a field magnet 1. In this embodiment, an example in which four poles are magnetized is shown, and the N pole S is evenly spaced along the circumferential direction.
The poles alternate. The armature 22 is made of a bulk material of soft magnetic material or a laminated steel plate, and has six armature salient poles 2. A motor winding 3 is applied to each armature salient pole 2 by a concentrated winding method. The motor is driven by a magnetic pole detection device (for example, a Hall element, not shown) that detects the rotor position, or the position of the rotor 21 is detected by sensorless drive, and an appropriate drive winding is excited, which causes the rotor 21 to move. Rotate in the desired direction.

Subsequently, a slit (groove) 10 is formed on the armature salient pole 2.
The effect of the provision will be explained in detail. FIG. 13 shows a diagram modeling the flow of magnetic flux near the armature salient poles in the present embodiment. FIG. 13 shows an armature salient pole 2 and a field magnet 1.
And slits (grooves) 10 and lines 6 showing the flow of magnetic flux. As shown in FIG. 16, the armature salient poles 2 are the field magnets 1
When it is on or near the boundary of different poles, the magnetic flux flows easily through the armature salient poles 2 and is short-circuited. However, in the structure of the armature salient pole according to the present invention, as shown in FIG. 13, by providing the armature salient pole 2 with the slit (groove) 10, the magnetic permeability in the circumferential direction of rotation of the rotor is reduced, and the magnetic flux The flow is less likely to flow in the direction of rotation of the rotor, thus reducing the short circuit magnetic flux.

Therefore, the diagram showing the relationship between the rotation angle of the rotor and the amount of effective magnetic flux flowing into the armature is the same as the diagram shown in the first embodiment and becomes the diagram shown in FIG. That is, by providing a slit (groove) in the armature salient pole 2, it is possible to short-circuit the armature salient pole portion 2 to reduce the reactive magnetic flux, and obtain an effective magnetic flux in a form close to the theoretical state. Recognize. Further, in the present embodiment, the effect can be obtained by a simple method of providing slits (grooves) for making the armature salient poles anisotropic.

[0040]

As described above, the electric motor of the present invention is a salient pole type concentrated winding system suitable for downsizing and weight saving, but reduces short circuit of the magnetic flux in the armature salient pole portion to reduce the effective magnetic flux amount. It is possible to make the structure suitable for a high torque type motor and a high efficiency motor by increasing

[Brief description of drawings]

FIG. 1 is a front view of an electric motor showing an embodiment of the present invention.

FIG. 2 is a diagram modeling a flow of magnetic flux in the vicinity of an armature salient pole in the present embodiment.

FIG. 3 is a relationship diagram between a rotation angle of a rotor and an effective magnetic flux amount.

FIG. 4 is a front view of an electric motor showing a second embodiment of the present invention.

FIG. 5 is a diagram modeling a flow of magnetic flux in the vicinity of an armature salient pole in the present embodiment.

FIG. 6 is a front view of an electric motor showing a third embodiment of the present invention.

FIG. 7 is a diagram modeling a flow of magnetic flux in the vicinity of an armature salient pole in the present embodiment.

FIG. 8 is a diagram showing a configuration example of a magnetic anisotropic material used in this example.

FIG. 9 is a front view of an electric motor according to a fourth embodiment of the present invention.

FIG. 10 is a structural diagram of an armature salient pole of the present invention.

FIG. 11 is a diagram modeling the flow of magnetic flux near the armature salient poles in the present embodiment.

FIG. 12 is a front view of an electric motor according to a fifth embodiment of the present invention.

FIG. 13 is a diagram modeling the flow of magnetic flux near the armature salient poles in the present embodiment.

FIG. 14 is a front view showing the upper half of a conventional salient pole type concentrated winding type electric motor.

FIG. 15 is a diagram modeling a flow of magnetic flux near an armature salient pole.

FIG. 16 is a diagram modeling a magnetic flux flow in the vicinity of an armature salient pole.

FIG. 17 is a relationship diagram between a rotation angle of a rotor and an effective magnetic flux amount.

[Explanation of symbols]

 1. Field magnet 2. Armature salient pole 3. Armature winding 4. Core 5. Member made of diamagnetic material 6. Line showing flow of magnetic flux 7. Iron powder 8. Epoxy resin 9. Glass fiber layer 10. Slit 11. U-shaped member 21. Armature 22. Rotor

Claims (5)

[Claims] 1. In a salient pole type concentrated winding type electric motor having an armature made of a bulk material of soft magnetic material or a laminated steel sheet and a field magnet, a side surface of the armature salient pole facing the field magnet. An electric motor characterized in that a member made of a diamagnetic material is provided at an edge portion. 2. A member made of a diamagnetic material, which is provided at an edge portion of a side surface of an armature salient pole facing a field magnet, and also serves as a winding fixing member. Electric motor. 3. A salient pole concentrated winding type motor having an armature made of a bulk material of soft magnetic material or a laminated steel plate and a field magnet, in a direction facing the field magnet of the armature core. An electric motor characterized by having anisotropy in the magnetic permeability of the rotor and the magnetic permeability in the circumferential direction of rotation of the rotor. 4. A laminated steel plate made of a soft magnetic material is used for the armature core, and the lamination direction of the laminated steel plates at the armature salient poles is laminated in the circumferential direction in which the rotor rotates. The electric motor according to claim 3. 5. In a salient pole type concentrated winding type motor having an armature made of a bulk material of soft magnetic material or a laminated steel plate and a field magnet, a direction in which the armature salient pole faces the field magnet. An electric motor characterized in that a slit (groove) is provided in the.