JP2002165390A - Magnetic field stator of magneto electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic field stator of magneto electric motor capable of reducing noise with insensitive to accuracy of inner diameter of a field magnetic stator. SOLUTION: A field magnetic field stator comprises a cylindrical-shaped yoke 1, a plurality of fan-shaped permanent magnets 2, auxiliary magnetic poles 3 and a plurality of stays 4 with roughly U-shaped cross sections fixed to the yoke 1, The permanent magnets 2 and the magnet poles 3 are arranged between adjacent stays 4 to fix the magnets 2 and the poles 3 to an inner circumferential surface of the yoke 1 in the radial direction by using spring- reaction force while deforming elastically the stays 4. Moreover, projections 41 provided at both ends of the stays 4 are deformed with bending to hold the magnets 2 and the poles 3 in the thrust direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field stator for a magnet type electric motor, and more particularly, to a field stator for a magnet type electric motor having a good inner diameter of the stator.

[0002]

2. Description of the Related Art A conventional field stator of a magnet type electric motor has a structure in which a permanent magnet and an auxiliary magnetic pole are fixed to an inner peripheral side of a yoke. As a method for fixing a permanent magnet or the like, particularly in the thrust direction, for example, a method in which a projection or a claw is provided on the inner peripheral surface of a yoke of a field stator is known as described in JP-A-6-276703. I have. Further, as disclosed in Japanese Patent Application Laid-Open No. 8-23647, a holder for holding a permanent magnet or the like is adhered to an inner peripheral surface of a yoke with an adhesive.

[0003]

Recently, a magnet type electric motor,
For example, starters tend to be miniaturized. Since the generated torque decreases with the downsizing of the starter,
In a reduction type starter having a built-in speed reduction mechanism, the torque transmitted to the engine is made the same as that of the related art by increasing the reduction ratio. in this way,
As a result of increasing the reduction ratio, the rotation speed of the starter is inevitably increasing. As a result, for example, JP-A-6-2
In the electric motor having the structure described in Japanese Patent No. 76703 and Japanese Patent Application Laid-Open No. Hei 8-23647,
There is a problem that the generation of noise and abnormal noise becomes remarkable.

For example, in the configuration described in Japanese Patent Application Laid-Open No. 6-276703, the yoke is distorted when a projection or a claw is formed on the inner peripheral surface of the yoke, and a virtual circle inside a permanent magnet or the like, that is, a field field Since the inner diameter of the stator is distorted and varied, noise, abnormal noise, and the like are generated due to interference with the rotor and differences in the magnetic gap between the permanent magnet and the rotor. In addition, in the configuration described in Japanese Patent Application Laid-Open No. H8-23647, since the inner diameter of the field stator varies due to the curing of the adhesive, interference with the rotor and noise due to the magnetic gap difference between the permanent magnet and the rotor. , Abnormal noise, etc. are generated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a field stator for a magnet type electric motor in which the influence of the field stator inner diameter accuracy is small and noise can be reduced.

[0006]

(1) In order to achieve the above object, the present invention provides a cylindrical yoke, a plurality of sector-shaped permanent magnets, and a cross section fixed to the yoke having a substantially U shape. Having a plurality of stays in the shape of a letter, and while elastically deforming this stay, disposing the permanent magnet between adjacent stays, using the spring reaction force of the elastic deformation to radially move the permanent magnet, In the field stator of the magnet type electric motor fixed to the inner peripheral surface of the yoke, the stay has projecting portions provided at both ends thereof and extending in the thrust direction and longer than the permanent magnet, and the projecting portion is bent and deformed. Is held in the thrust direction. With such a configuration, the influence of the field stator inner diameter accuracy is small and noise can be reduced.

(2) In the above (1), preferably,
The field stator is provided with the same number of auxiliary magnetic poles as the permanent magnets, and bends and deforms the projecting portion to hold the permanent magnets and the auxiliary magnetic poles in the thrust direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a field stator of a magnetic generator according to an embodiment of the present invention will be described below with reference to FIGS. First, the overall configuration of the field stator of the magnet type generator according to the present embodiment will be described with reference to FIG. FIG. 1 is a plan view showing an entire configuration of a field stator of a magnet type generator according to an embodiment of the present invention.

A plurality of (six poles) permanent magnets 2 having a fan-shaped cross section and a pair of auxiliary magnetic poles 3 are arranged at equal intervals on the inner periphery of the cylindrical yoke 1. A stay 4 having a substantially U-shaped cross section is provided between the one field pole and the other adjacent field pole by elastically deforming the substantially U-shaped section. The permanent magnet 2 and the auxiliary magnetic pole 3 are fixed to the inner peripheral surface of the yoke 1 in a radial direction by utilizing a spring reaction force of elastic deformation of the substantially U-shaped stay 4. The projecting portion 41 formed longer than the field pole is bent and plastically deformed in the thrust direction at both ends of the stay 4 to fix the field pole as a stopper in the thrust direction of the field pole.

Next, the state of mounting and fixing the field poles in the field stator of the magnet type generator according to the present embodiment will be described with reference to FIG. FIG. 2 is a perspective sectional view showing a fixed state of the field poles in the field stator of the magnet type generator according to the embodiment of the present invention. The same reference numerals as those in FIG.
The same parts are shown.

The substantially U-shaped stay 4 has two holes 42 in the thrust direction. The stay 4 is fixed to the inner periphery of the yoke 1 using the hole 42. The fixing method will be described later with reference to FIG.

The permanent magnet 2 and the auxiliary magnetic pole 3 are fixed to the inner peripheral surface of the yoke 1 in the radial direction by utilizing the spring reaction force of the elastic deformation of the substantially U-shaped stay 4. At both ends of the stay 4, two projecting portions 41 are provided, respectively. The projecting portion 41 is bent toward the field pole and is plastically deformed to fix the field pole in the thrust direction.

Next, a method of assembling the field stator of the magnet generator according to the present embodiment will be described with reference to FIGS. 3 to 9 are explanatory diagrams of a method of assembling the field stator of the magnet generator according to the embodiment of the present invention.
FIG. 4 is a front view of a main part in a state where the stay is mounted, and FIG. 4 is a plan view of FIG. 3. FIG. 5 is a partial sectional view when the stay is attached. FIG. 6 is a front view of a main part in a field pole mounted state, and FIG. 7 is a plan view of FIG. FIG.
FIG. 4 is a plan view showing a state of a stay. FIG. 9 is an explanatory diagram of a bent state of the protrusion. In each drawing, the same reference numerals as those in FIG. 1 indicate the same parts.

As shown in FIGS. 3 and 4, a plurality of (six) stays 4 are temporarily fixed to the inner peripheral surface of the yoke 1 at equal intervals. Protrusions 41 are provided at both ends of the two side surfaces of the substantially U-shaped stay 4, respectively. About U
A hole 42 is provided on the bottom surface of the letter-shaped stay 4. Using this hole 42, the stay 4
Are fixed to the inner peripheral surface of the yoke 1.

As shown in FIG. 5, after the stay 4 is arranged at a fixed position on the inner peripheral surface of the yoke 1, the stay 4 is pressed down by the punch 6 from the outer peripheral side of the yoke 1 while the stay 4 is pressed.
Is extruded and plastically deformed. As a result, stay 4
The hole 42 is filled with the member of the yoke 1, and the stay 4 is temporarily fixed to the inner peripheral surface of the yoke 1. The method of temporarily fixing the stay 4 is not limited to the illustrated example, and for example, a method such as welding may be used. In the present embodiment, the stay 4
The yoke 1 is plastically deformed to temporarily fix
The place is a position corresponding to the bottom surface of the stay 4.
Accordingly, at the position corresponding to the bottom surface of the stay 4, distortion occurs in the yoke 1, but since the permanent magnet 2 and the auxiliary magnetic pole 3 are fixed between the adjacent stays 4, this distortion is generated. And the inner diameter of the auxiliary pole 3 is not affected.

Next, as shown in FIGS. 6 and 7, a pair of field poles composed of the permanent magnet 2 and the auxiliary magnetic pole 3 are arranged between the adjacent substantially U-shaped stays 4 in the thrust direction of the stay 4. The stay 4 is inserted while being elastically deformed. As shown in FIG. 8, the stay 4 is deformed from a state shown by a broken line to a state shown by a solid line. Thus, the six permanent magnets 2, the auxiliary magnetic poles 3, and the stays 4 are fixed to the inner peripheral surface of the yoke 1 in the radial direction. Iron or stainless steel can be used as the material of the stay 4. When stainless steel is used, the field pole can be securely fixed in the radial direction because the spring property is greater than that of iron.

Next, as shown in FIG. 9, wedge-shaped jigs 7 are inserted from above and below the yoke 1 to project from the protrusions 41 of the stay 4 (four places for one stay and 24 places for six stays). Section) at the same time. FIG. 9 shows a bent state at the upper end side of the yoke 1. The wedge-shaped jig 7 is inserted into the U-shaped stay 4 at the center of the U-shape from above the yoke 1. The two projecting portions 41 at the upper end of the stay 4 are bent by the wedge-shaped inclined surface of the wedge-shaped jig 7 with the corner of the upper end of the permanent magnet 2 or the auxiliary magnetic pole 3 as a fulcrum, and are plastically deformed. Thus, the thrust direction stoppers of the six permanent magnets 2 and the auxiliary magnetic poles 3 are formed by the protrusions 41. When stainless steel is used as the material of the stay 4, the spring property thereof is large, so that the projecting portion 41 of the stay 4 is plastically deformed, so that the field pole can be reliably held in the thrust direction.

As described above, in the present embodiment, the thrust direction of the field pole composed of the permanent magnet 2 and the auxiliary magnetic pole 3 is fixed by bending the projecting portion 41 of the stay 4 so that the permanent magnet 2 and the auxiliary magnetic pole 3 are fixed. It is possible to reduce the distortion and variation of the virtual circle inside 3, that is, the inner diameter of the field stator. As a result, it is possible to suppress the occurrence of noise, abnormal noise, and the like due to interference with the rotor and a magnetic gap difference between the permanent magnet and the rotor.

Also, since the 24 projecting portions 41 provided on the 6 stays can be simultaneously bent up and down by using two wedge-shaped jigs, the number of working steps can be reduced, and the workability is improved. It will improve.

[0020]

According to the present invention, the influence of the field stator inner diameter accuracy is small and noise can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an entire configuration of a field stator of a magnet generator according to an embodiment of the present invention.

FIG. 2 is a perspective cross-sectional view showing a fixed state of field poles in a field stator of the magnet type generator according to one embodiment of the present invention.

FIG. 3 is an explanatory view of a method of assembling the field stator of the magnet generator according to the embodiment of the present invention, and is a front view of a main part in a state where a stay is mounted.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is an explanatory view of a method of assembling the field stator of the magnet generator according to the embodiment of the present invention, and is a partial cross-sectional view when the stay is attached.

FIG. 6 is an explanatory view of a method of assembling the field stator of the magnet generator according to the embodiment of the present invention, and is a front view of a main part in a state where the field poles are attached.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is an explanatory view of a method of assembling the field stator of the magnet type generator according to the embodiment of the present invention, and is a plan view showing a state of a stay.

FIG. 9 is an explanatory view of a method of assembling the field stator of the magnet type generator according to the embodiment of the present invention, and is an explanatory view of a bent state of the protruding portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Yoke 2 ... Permanent magnet 3 ... Auxiliary magnetic pole 4 ... Stay 41 ... Projection part 42 ... Hole 5 ... Reception 6 ... Punch 7 ... Wedge-shaped jig

Continued on the front page F term (reference) 5H615 AA01 BB01 BB14 PP01 PP07 PP28 SS19 SS20 TT05 5H621 GA01 JK02 JK05 JK07 5H622 CA02 CA07 CB05 PP04 PP07 PP10 PP11 PP14 PP15 PP17

Claims (2)

[Claims] 1. A cylindrical yoke, a plurality of sector-shaped permanent magnets, and a plurality of stays fixed to the yoke and having a substantially U-shaped cross section. A field stator of a magnet type electric motor in which the permanent magnets are arranged between adjacent stays and the permanent magnets are fixed to the inner peripheral surface of the yoke in a radial direction by using a spring reaction force of elastic deformation. Are provided with protruding portions provided at both ends thereof in the thrust direction and longer than the permanent magnets, and bending and deforming the protruding portions to hold the permanent magnets in the thrust direction. . 2. The field stator for a magnet type electric motor according to claim 1, wherein said field stator has the same number of auxiliary magnetic poles as said permanent magnets, and said projecting portion is bent and deformed to produce said permanent magnet. And a field stator for a magnet type electric motor, wherein the auxiliary magnetic pole is held in a thrust direction.