JPH1189195A - Stator structure for sr motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vibration by providing a gap between a stator core and a stator holder, and providing protrusions to give inward pilot pressure to the protrusions of the core, thereby suppressing an outward deformation force generated at the core to be absorbed. SOLUTION: Four protrusions (on which coils 13A to 13D are respectively arranged to constitute poles) 11A to 11D at an interval of 90 degrees on an inner surface of a stator core 1, and protrusions 12A to 12D of a stator holder 2 for fixing an outer surface corresponding to mounting sites of the protrusions 11A to 11D are formed. The holder 2 is formed substantially in a cylindrical state of material having rigidity such as iron or the like to have a predetermined strength, and press-fitted in the state that the protrusions 12A to 12D of the core l are brought into contact at four positions with its inner periphery. Thus, an inward pilot pressure can be given to the protrusions 11A to 11D of the core 1 via the protrusions 12A to 12D brought into contact with the holder 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention has a large output,
Moreover, it has the feature of long durability time, such as electric vehicles,
SR suitable for application to electric bicycles or vacuum cleaners
The present invention relates to a motor (switched reluctance motor), and more particularly to a stator structure of an SR motor capable of suppressing vibration.

[0002]

2. Description of the Related Art As shown in FIG. 5, for example, this SR motor has a rotor 1 having an outwardly convex magnetic pole 101 inside.
00 and a stator 2 having an inwardly convex portion 201 on the outside.
00 and the stator 200
A coil 202 formed by winding an appropriate winding is attached to each convex portion 201 on the side.

[0003] The stator 200 of this SR motor has
It is formed of a stator core product 203 or the like obtained by laminating a number of substantially thin disk-shaped members made of a magnetic material. .

[0004]

By the way, in such an SR motor, as shown in FIG. 6, due to the magnetic attraction, the projecting portion of the stator 200 which is energized (2
The two magnetic pole pairs, for example 201A and 201B) are pulled between the convex magnetic poles on the rotor side and are displaced by the inward force acting in the radial direction. Conversely, an outward force (deformation force) acts by the reaction force, and is deformed into an elliptical shape. Also, at the moment when the energization is completed and the excitation is cut off, the stator returns to the original true circular shape.Therefore, during the rotating operation in which this operation is sequentially repeated for each magnetic pole of each convex portion, this deformation operation is repeated many times. Is repeated, and vibration is generated each time, and becomes a source of noise.

In view of the above circumstances, the present invention provides a stator structure of an SR motor capable of efficiently reducing the displacement of the stator during operation of the motor and effectively preventing generation of noise due to the deformation. It is intended to provide.

[0006]

That is, according to the first aspect of the present invention, there is provided a rotor having an outwardly salient pole structure and a stator having an inwardly salient magnetic pole structure so as to surround the rotor from the outside. In the SR motor for rotating a rotor by a magnetic attraction force on the stator side, the stator includes an inner stator core having a magnetic pole formed on a convex portion and a stator holder provided on the outer side thereof. An appropriate gap is provided between the holder and the protrusion, and at least one of the protrusions is provided with a protrusion. An inward preload is applied to the stator core to perform an approaching operation when the rotor generates torque. Than Kino deforming force is obtained by construction to equal or better the preload force is large.

[0007]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing a stator structure of an SR motor according to a first embodiment of the present invention.
A substantially cylindrical stator holder 2 is press-fitted into a stator core product obtained by laminating a large number of stator cores 1 (formed of substantially thin disk-shaped ones) provided with D. In addition,
In this embodiment, the substantially cylindrical stator holder 2 is fixed to the stator core product by press-fitting. However, the present invention is not limited to this. For example, shrink fitting may be performed.

That is, the stator core 1 has convex portions (the coils 13A to 13D constituting the magnetic poles) 11A to 11A on its inner surface (in this embodiment, four locations at 90 ° intervals).
In addition to providing the D, projections 12A to 12D for fixing the stator holder 2 to the outer surface portion (of the same portion) corresponding to the mounting portion of the convex portions 11A to 11D (in this embodiment, 4 at 90 ° intervals). Location) is formed. In addition,
In this embodiment, the stator is provided with four convex portions (magnetic poles) on the inner surface of the stator. However, the present invention is not particularly limited to this type. The same number of protrusions may be provided on the outer surface.

The stator holder 2 is formed in a substantially cylindrical shape from a rigid material such as iron and has a certain strength.
The protrusions 12A to 12D of the stator core 1 have four
It is press-fitted in a state where it touches at a point. As a result, a preload F directed inward is applied to the convex portions 11A to 11D of the stator core 1 via the protrusions 12A to 12D that come into contact with the stator holder 2. Will be given. Here, the magnitude of the preload is initially set so as to be equal to or greater than the outward pressing force (hereinafter, deformation force) F at the non-exciting convex portion generated when excited. I have. In addition,
In this embodiment, the outward projection is provided on the stator core. However, in addition to this, for example, an inward projection may be provided on the stator holder, and the outward projection may not be provided on the stator core. It may be provided on both of the abutting projections.

Therefore, according to this embodiment, even if the stator core 1 is made of a thin plate material and has relatively small rigidity, the stator core product is firmly fixed and held by the rigidity provided in the stator holder 2 itself. So you can
Vibration during operation can be effectively suppressed. For example, as shown in FIG. 2, a non-conductive portion (non-excited portion) 11 </ b> D (and a non-illustrated convex portion) generated at the time of conduction / excitation to the convex portion 11 </ b> A (and the non-illustrated convex portion 11 </ b> C). The outward deforming force F at 11B) is the inward preload F. Therefore, as shown in FIG. And will not cause outward deformation at this point.

Next, another embodiment according to the present invention will be described. FIG. 4 is a schematic view showing a stator structure of an SR motor according to a second embodiment of the present invention. This stator structure has no stator core 3 provided with outward projections, and a predetermined portion of a stator holder 4. (Protrusions 41A-41
A bolt 5 is screwed from the outside to a portion corresponding to D). In order to prevent the bolt 5 from being loosened during the operation of the motor, the bolt 5 is screwed until a preload larger than the outward deformation force is generated, and then fixed by appropriate means (for example, welding). I have.

Therefore, according to this embodiment, the amount of screwing is finely adjusted in accordance with the slightly different outward pressing force depending on the individual motor, the preload is initially set to a specific value, and then the fixing is performed. Thus, the generation of vibration and noise can be suppressed more reliably.

[0013]

As described above, according to the present invention, a gap between the stator core and the stator holder is provided between the stator core and the stator holder while a portion where the deformation of the stator core is large during operation of the SR motor is provided. By providing the projection, an inward preload can be applied to the convex portion of the stator core, whereby the outward deformation force generated in the stator core during the operation of the SR motor is suppressed by the preload and absorbed, thereby reducing vibration. , Noise caused by physical vibration during operation of the SR motor can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an SR motor according to the present invention.

FIG. 2 is an explanatory view showing an operation of a main part.

FIG. 3 is a principle view of the same.

FIG. 4 is an explanatory view showing another embodiment.

FIG. 5 is a schematic view of a main part showing a conventional example.

FIG. 6 is an explanatory view showing the operation of a conventional example.

[Explanation of symbols]

 1,3 Stator core 2,4 Stator holder 12A-12D Projection 13A-13D Convex part 5 Bolt

Claims (1)

[Claims] An SR motor having a rotor having an outwardly salient pole structure and a stator having an inwardly convex magnetic pole structure surrounding the rotor from the outside, and rotating the rotor by magnetic attraction on the stator side. In the above, the stator is constituted by an inner stator core having a magnetic pole formed on a convex portion and a stator holder provided on an outer side thereof, and an appropriate gap is provided between the stator core and the stator holder, and at least one of them is provided. A protrusion is provided on one side, and the stator core is press-fitted or shrink-fitted into a stator holder in a state where the protrusion is inscribed to apply an inward preload to the convex portion of the stator core. The preload is greater than or equal to the outward deforming force generated between the non-excited magnetic pole pairs during excitation of the operating stator core. The stator structure of the SR motor, characterized by being configured so.