JP2003284302A - Claw-pole rotating electric machine - Google Patents

Abstract

(57) [PROBLEMS] To provide a claw-pole type rotating electric machine which can reduce the magnetization of a shaft and the leakage of an effective magnetic flux without damaging a bearing. An armature core fixed to a bracket, an armature winding inserted into the armature core, a ring-shaped field core supported by the bracket and wound with a field winding, and an armature core. A claw-shaped magnetic pole that is fitted to the shaft on the inner circumferential side and the outer circumferential side of the field core with a gap therebetween, and is excited by the magnetomotive force generated by the field winding, and is magnetically insulated from the claw-shaped magnetic pole and is different In a claw-pole type rotating electric machine having a rotor in which claw-shaped magnetic poles excited magnetically are alternately arranged at intervals in a circumferential direction, a non-magnetic material is used for a shaft. Since the shaft made of non-magnetic material is not magnetized, the leakage of the effective magnetic flux can be eliminated, so that the size can be reduced and the bearing is not damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a claw pole type rotary electric machine in which a rotor having a plurality of claw-shaped magnetic poles faces a stator with a gap.

[0002]

2. Description of the Related Art A conventional claw pole type rotating electric machine will be described with reference to FIG. FIG. 5 is a vertical cross-sectional view of the claw pole type rotating electric machine showing the upper half of the rotor in cross section. In the figure, an armature winding 3 is inserted in an armature core 2. A hollow material rotor 4 is fitted on the shaft 1, and opposing claw-shaped magnetic poles 5 are connected by a non-magnetic ring 6. A field iron core 7 supported by a bracket 10 and a field winding 8 wound around the field iron core 7 are arranged on the inner peripheral side of the rotor 4 via a gap 9. By supplying an electric current to the field winding 8 and generating a magnetic flux around the field winding 8, the claw pole type rotating electric machine rotates and exhibits its function. In order to utilize this magnetic flux most strongly and effectively, the rotor 4, the armature core 2 and the field core 7 are made of a ferromagnetic material. Reference numeral 12 is a bearing, and 13 is a rolling element.

When an electric current is applied to the field winding 8 of the claw pole type rotating electric machine, a strong effective magnetic flux is generated in the magnetic circuit 11 of the rotor 4, the armature core 2 and the field iron core 7, and the claw pole type rotating machine is rotated. The electric machine rotates and performs its function.

[0004]

However, in the claw pole type rotary electric machine having the conventional structure as described above, the shaft 1
Since the bearing 12 is made of a ferromagnetic material, the magnetic flux of the magnetic circuit 11 magnetizes the shaft 1, and the bearing 12 in contact with the shaft 1 is also magnetized. That is, there is a problem that the magnetic flux leaks to the shaft 1 and the bearing 12 to reduce the effective magnetic flux. The claw pole type rotary electric machine is large in size because it is designed in consideration of the reduction of the effective magnetic flux. Further, when the shaft 1 and the bearing 12 are magnetized, the metal powder of the magnetic substance adheres to the inside of the bearing to cause the rolling element 13 to rotate. Since this may hurt people, this measure was required.

The present invention (corresponding to claims 1 to 4) is
The problem was solved in order to deal with the above situation, and the problem is to eliminate the magnetization of the shaft and to eliminate the leakage of the effective magnetic flux, which enables downsizing and does not damage the bearing. To provide.

[0006]

In order to achieve the above object, the invention according to claim 1 is to provide an armature core fixed to a bracket, an armature winding inserted in the armature core, and An annular field iron core supported by a bracket and around which a field winding is wound, and fitted to the shaft so as to have gaps between the inner peripheral side of the armature iron core and the outer peripheral side of the field iron core, respectively. Rotation in which claw-shaped magnetic poles that are excited by the magnetomotive force of the winding and claw-shaped magnetic poles that are magnetically insulated from the claw-shaped magnetic poles and that are excited by different magnetism are alternately arranged at intervals in the circumferential direction. A claw pole type rotary electric machine having a child is characterized by using a non-magnetic material for the shaft.

According to the first aspect of the invention, since the shaft is made of a non-magnetic material and is not magnetized, leakage of effective magnetic flux can be eliminated, so that the size can be reduced and the bearing is not damaged.

According to a second aspect of the present invention, an armature iron core fixed to a bracket, an armature winding inserted in the armature iron core, and an annular winding having a field winding supported by the bracket are wound around the armature winding. A field core, a claw-shaped magnetic pole that is fitted to the shaft so as to have an inner peripheral side of the armature core and an outer peripheral side of the field core through a gap, and is excited by a magnetomotive force of the field winding; A claw pole type rotary electric machine having rotors which are magnetically insulated from the claw-shaped magnetic poles and are excited by different magnetisms and are alternately arranged at intervals in the circumferential direction. An intermediate ring made of a non-magnetic material is fitted between the shaft and the shaft.

According to the second aspect of the invention, since the intermediate ring is made of a non-magnetic material and is not magnetized, the shaft can be magnetized and the effective magnetic flux can be prevented from leaking, thereby enabling downsizing and damage to the bearing. Never give.

According to a third aspect of the present invention, an armature core fixed to a bracket, an armature winding inserted into the armature core, and an annular coil supported by the bracket around which a field winding is wound. A field core, a claw-shaped magnetic pole that is fitted to the shaft so as to have an inner peripheral side of the armature core and an outer peripheral side of the field core through a gap, and is excited by a magnetomotive force of the field winding; A claw pole type rotary electric machine having rotors which are magnetically insulated from the claw-shaped magnetic poles and are excited by different magnetisms and are alternately arranged at intervals in the circumferential direction. And a portion of the shaft through which the magnetic flux passes are integrally formed into a claw-shaped magnetic pole, and a portion of the shaft through which the magnetic force lines do not pass is made of a non-magnetic material.

According to the third aspect of the invention, the rotor and the shaft of the non-magnetic material are coaxially joined, but the shaft of the non-magnetic material is not magnetized, so that the effective magnetic flux can escape to other than the magnetic circuit. Absent. Therefore, the leakage of the effective magnetic flux can be eliminated, the size can be reduced, and the bearing is not damaged.

According to a fourth aspect of the present invention, in the claw pole type rotary electric machine according to the third aspect, the shaft is made of a magnetic material, and an intermediate material of a non-magnetic material is inserted between the claw-shaped magnetic pole and the shaft. Is characterized by.

According to the fourth aspect of the invention, since the intermediate material inserted between the claw-shaped magnetic pole and the shaft is a non-magnetic material, it is not magnetized, so that the effective magnetic flux does not escape to other than the magnetic circuit. Therefore, the size of the shaft can be reduced by eliminating the magnetization of the shaft and the leakage of the effective magnetic flux, and the bearing is not damaged.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a cross section of an upper half of a rotor of a claw pole type rotary electric machine according to a first embodiment (corresponding to claim 1) of the present invention.

As shown in the figure, an armature winding 3 is inserted in an armature core 2 fixed to a bracket 10.
The shaft 1a is made of a non-magnetic material, and a hollow rotor 4 is fitted on the shaft 1a. The rotor 4 is excited by a claw-shaped magnetic pole 5 that is excited by a magnetomotive force generated by the field winding 8, and different magnetism that is magnetically insulated and connected by the claw-shaped magnetic pole 5 and the nonmagnetic ring 6. The claw-shaped magnetic poles 5 are alternately arranged at intervals in the circumferential direction. Further, the bracket 1 is provided on the inner peripheral side of the rotor 4.
An annular field iron core 7 supported by 0 and a field winding 8 wound around the field iron core 7 are respectively provided with a gap 9 on the inner peripheral side of the armature core 2 and the outer peripheral side of the field iron core 7. It is fitted and disposed on the shaft 1a so as to intervene. The rotor 4, the armature core 2 and the field core 7 are made of a ferromagnetic material. 12
Is a bearing, and 13 is a rolling element.

Next, the operation of this embodiment will be described. When an electric current is applied to the field winding 8 of the claw pole type rotary electric machine, the magnetic circuit 1 of the rotor 4, the armature core 2 and the field core 7 is formed.
A strong effective magnetic flux is generated in 1, and the claw pole type rotating electric machine rotates and exerts its function. At this time, shaft 1
Since a is a non-magnetic material, it is not magnetized and the effective magnetic flux is
There is no escape other than 1. Therefore, in the claw pole type rotary electric machine of the present embodiment, leakage of effective magnetic flux can be eliminated, so that the size can be reduced and the bearing 12 is not damaged.

FIG. 2 is a vertical cross-sectional view showing a cross section of the upper half of the rotor of the claw pole type rotary electric machine according to the second embodiment (corresponding to claim 2) of the present invention. As shown in the figure, the claw pole type rotary electric machine of the present embodiment differs from the claw pole type rotary electric machine of the first embodiment of FIG. 1 in that the shaft 1b is made of a magnetic material and The intermediate ring 14 made of a non-magnetic material is fitted between the rotors 4, and the other configurations are the same. Therefore, the same portions will be denoted by the same reference numerals.

The operation of this embodiment will be described. When a current is applied to the field winding 8 of the claw pole type rotary electric machine, it has a powerful effect on the magnetic circuit 11 of the rotor 4, the armature core 2 and the field core 7. Magnetic flux is generated, and the claw pole type rotating electrical machine rotates and exerts its function. At this time, the intermediate ring 14 is not magnetized because it is a non-magnetic material, and the effective magnetic flux is the magnetic circuit 1.
There is no escape other than 1. Therefore, the shaft 1b
It is possible to provide a claw-pole type rotating electric machine that does not damage the bearing because it can be downsized by eliminating the magnetization of the above and eliminating the leakage of the effective magnetic flux.

FIG. 3 is a vertical cross-sectional view showing an upper half of a rotor of a claw pole type rotary electric machine according to a third embodiment (corresponding to claim 3) of the present invention. As shown in the figure, the structure of the claw pole type rotating electric machine of the present embodiment is different from that of the claw pole type rotating electric machine of the first embodiment shown in FIG.
Reference character a denotes a solid material, which is coaxially joined to the shaft 1c made of a non-magnetic material. Since other configurations are the same, the same parts are designated by the same reference numerals.

The operation of this embodiment will be described. When a current is applied to the field winding 8 of the claw pole type rotary electric machine, it has a powerful effect on the magnetic circuit 11 of the rotor 4, the armature core 2 and the field core 7. Magnetic flux is generated, and the claw pole type rotating electrical machine rotates and exerts its function. At this time, the rotor 4a and the shaft 1c made of a non-magnetic material are coaxially joined, but the shaft 1c made of a non-magnetic material is not magnetized, so that the effective magnetic flux does not escape to other than the magnetic circuit 11. Therefore, the leakage of the effective magnetic flux can be eliminated, and the size can be reduced.
It is possible to provide a claw pole type rotating electric machine that does not damage the bearing.

FIG. 4 is a vertical sectional view showing an upper half of a rotor of a claw pole type rotary electric machine according to a fourth embodiment (corresponding to the claims) of the present invention in section. As shown in the figure, the claw pole type rotating electric machine of the present embodiment differs from the claw pole type rotating electric machine of the third embodiment of FIG. 3 in that the shaft 1d is made of a magnetic material. 1d
The intermediate ring 15 made of a non-magnetic material is inserted between the rotor 4a and the rotor 4a, and they are joined to each other. Since the other configurations are the same, the same portions are denoted by the same reference numerals.

The operation of this embodiment will be described. When an electric current is applied to the field winding 8 of the claw pole type rotary electric machine, it has a powerful effect on the magnetic circuit 11 of the rotor 4, the armature core 2 and the field core 7. Magnetic flux is generated, and the claw pole type rotating electrical machine rotates and exerts its function. At this time, the intermediate ring 15 is not magnetized because it is a non-magnetic material, and the effective magnetic flux is the magnetic circuit 1.
There is no escape other than 1. Therefore, the shaft 1d
It is possible to provide a claw pole type rotary electric machine that does not damage the bearing by eliminating the magnetization and eliminating the leakage of the effective magnetic flux.

[0023]

As described above, the present invention (Claim 1)
According to claim 4), it is possible to reduce the size by eliminating the magnetization of the shaft and eliminating the leakage of the effective magnetic flux.
It is possible to provide a claw pole type rotating electric machine that does not damage the bearing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a cross section of an upper half of a rotor of a claw pole type rotary electric machine that is a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an upper half of a rotor of a claw pole type rotary electric machine according to a second embodiment of the present invention in a cross section.

FIG. 3 is a vertical cross-sectional view showing an upper half of a rotor of a claw pole type rotary electric machine that is a third embodiment of the present invention in cross section.

FIG. 4 is a vertical cross-sectional view showing an upper half of a rotor of a claw pole type rotary electric machine according to a fourth embodiment of the present invention in a cross section.

FIG. 5 is a vertical cross-sectional view showing an upper half of a rotor of a conventional claw pole type rotary electric machine in a cross section.

[Explanation of symbols]

1, 1a, 1b, 1c, 1d ... Shaft, 2 ... Armature iron core, 3 ... Armature winding, 4, 4a ... Rotor, 5 ... Claw-shaped magnetic pole, 6 ... Non-magnetic ring, 7 ... Field iron core, 8 ... Field winding,
9 ... Gap, 10 ... Bracket, 11 ... Circuit, 12 ...
Bearing, 13 ... Rolling element, 14 ... Intermediate ring, 15 ... Intermediate material.

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Claims (4)

[Claims] 1. An armature core fixed to a bracket,
An armature winding inserted into this armature core, and an annular field core supported by the bracket and wound with a field winding,
A claw-shaped magnetic pole that is fitted to the shaft so as to have an inner peripheral side of the armature core and an outer peripheral side of the field core through a gap, and is excited by a magnetomotive force of the field winding; and the claw-shaped magnetic pole. In a claw pole type rotary electric machine having a rotor in which claw-shaped magnetic poles that are magnetically insulated and excited by different magnetisms are alternately arranged at intervals in the circumferential direction, a non-magnetic material is used for the shaft. Claw pole type rotating electrical machine characterized by that. 2. An armature core fixed to a bracket,
An armature winding inserted into this armature core, and an annular field core supported by the bracket and wound with a field winding,
A claw-shaped magnetic pole that is fitted to the shaft so as to have an inner peripheral side of the armature core and an outer peripheral side of the field core through a gap, and is excited by a magnetomotive force of the field winding; and the claw-shaped magnetic pole. In a claw pole type rotating electric machine having magnetically insulated claw-shaped magnetic poles that are excited by different magnetism and are alternately arranged at intervals in the circumferential direction, between the claw-shaped magnetic pole and the shaft. A claw-pole type rotating electric machine characterized in that an intermediate ring made of a non-magnetic material is fitted in. 3. An armature core fixed to a bracket,
An armature winding inserted into this armature core, and an annular field core supported by the bracket and wound with a field winding,
A claw-shaped magnetic pole that is fitted to the shaft so as to have an inner peripheral side of the armature core and an outer peripheral side of the field core through a gap, and is excited by a magnetomotive force of the field winding; and the claw-shaped magnetic pole. In a claw pole type rotary electric machine having a rotor in which claw-shaped magnetic poles that are magnetically insulated and excited by different magnetisms are alternately arranged at intervals in the circumferential direction, a magnetic flux of the claw-shaped magnetic pole and the shaft A claw pole type rotating electric machine characterized in that a portion of a shaft through which a magnetic field line does not pass is made of a non-magnetic material by integrally forming a portion through which a claw-shaped magnetic pole passes. 4. The claw pole type rotary electric machine according to claim 3, wherein the shaft is made of a magnetic material, and an intermediate material of a non-magnetic material is inserted between the claw-shaped magnetic pole and the shaft. Type rotating electric machine.