JP2887132B1 - Motor structure - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To surely position a constituent member. SOLUTION: In a stator base formed in a hollow cylindrical shape and having a hub portion inserted and fitted into a central through hole of a stator, the hollow cylindrical hub portions are alternately arranged along a circumferential direction. A plurality of first upright ribs 41, a plurality of second upright ribs 42 having the same number as the first upright ribs 41, and a lower end connecting the bottom ends of these upright ribs. Outer engaging portions 44 are formed on the outer peripheral edge at the upper end of the upper portion 41, and outer step portions 47 are formed at predetermined positions on the outer peripheral edge of each second upright rib 42.
And the outer step portion 47 causes the silicon steel sheet set of the stator to be locked in the axial direction, and the second non-cylindrical surface 46 of the central through hole of the stator is opposed to the first non-cylindrical surface 46 of the outer peripheral surface of the hub portion. Positioning is performed by fitting and locking the cylindrical surfaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved motor structure, and more particularly to a motor structure for reliably positioning a stator, a stator base, and a rotor bearing in a motor in a circumferential direction and an axial direction. .

[0002]

2. Description of the Related Art FIG. 1 is an exploded perspective view of a part of a conventional DC motor. This motor has a rotor (not shown) having a rotating shaft, a bearing 60 having a center hole 61, thereby rotatably supporting the rotating shaft of the rotor, and an armature assembly B (a stator 70 and a circuit board). 80) and a stator base 90.

[0003] A circuit board 80 is electrically connected to a later-described stator winding and controls a motor operation.
(Not shown) and a central hole 81 (FIG. 5) formed in the central part.

Referring to FIGS. 1 and 6, a stator 70 is
A silicon steel sheet set 71 composed of a plurality of silicon steel sheets, a winding for generating a magnetic field of a motor (a portion denoted by a symbol W in FIG. 8), and the silicon steel sheet set 71 and the winding part are isolated and insulated. A hollow cylindrical insulating sleeve 72 to be
A plurality of positioning feet 73 are provided.

Next, referring to FIGS. 6, 7 and 8, FIG.
The method of assembling the armature assembly B shown in FIG. 6 is a partially cutaway perspective view, and FIG.
FIG. 8 is a partially enlarged view of a portion, and FIG. 8 is a sectional view in which the portion shown in FIG. 7 is inverted and further enlarged. 8, the stator 70 and the circuit board 80 are both passed through a tin plating bath to perform a plating operation, and the circuit board 80 and the stator 70 are assembled into the armature assembly B. FIG.
As shown in FIG. 8, when performing the plating operation, the stator 70 presses and supports the circuit board 80 with the lower end 72L of the insulating sleeve 72 and the positioning foot 73, and the positioning pin P passes through the circuit board 80. 73 is inserted. The winding W is housed between the insulating sleeve 72 and the positioning foot 73, and the end of the winding W is
Wound around.

A disadvantage of the armature assembly B is that a gap between the circuit board 80 and the lower end 72L of the insulating sleeve 72 is not uniform or vibration occurs when the armature assembly B passes through a tin plating bath. In this case, misalignment occurs, and as a result, defects such as warpage and inclination occur in the circuit board 80 in the assembled armature assembly B.

As shown in FIGS. 1 to 4, the stator base 90 is formed in a hollow cylindrical shape which is integrally connected to a base portion N capable of accommodating the circuit board 80, and is vertically connected to a center portion of the base portion N. And a hub portion M. The hub portion M has an upper portion 91 formed in a cylindrical shape, a lower portion 92 formed in a cylindrical shape and slightly larger than the upper portion 91, and a step portion 93 interposed between the two. In the assembled state, as shown in FIG. 3, the upper portion 91 of the hub M is inserted and fitted into the central through hole of the silicon steel sheet set 71 of the stator 70, and the step 93 of the hub M is The bottom surface of the silicon steel sheet set 71 is supported. The silicon steel sheet set 71 is fixed to the outer peripheral surface 94 of the upper part 91 by applying an adhesive to the outer peripheral surface 94 of the upper part 91 (FIG. 1). A center hole 95 for accommodating and holding the bearing 60 is formed in the center of the hub M. FIG. 4 shows how the bearing 60 is fitted into the center hole 95.

The structure of the stator base 90 has the following problems. First, the silicon steel sheet set 71 is adhered to the outer peripheral surface 94 of the upper portion 91 of the hub portion M by an adhesive. The adhesive is easily deteriorated at a high temperature, and is controlled to a just used amount when applying the adhesive. Therefore, it is not possible to guarantee that the stator 70 and the stator base 90 have a sufficient coupling strength. Therefore, the displacement of the stator 70 in the axial direction and the circumferential direction with respect to the stator base 90 cannot be reliably prevented, and the reliability is reduced. In the center hole 95 of the stator base 90, a bearing 60 is provided.
Therefore, the bearing 60 must be locked in the center hole 95 by a pressure fit method. If the fit between the bearing 60 and the center hole 95 is too tight, the rotation shaft of the rotor is moved to the center hole 61 of the bearing 60.
On the other hand, if the fitting is too loose, the bearing 60 cannot be securely locked at a predetermined position.
Fitting work is to be extremely difficult.

[0009]

SUMMARY OF THE INVENTION In view of the great drawbacks of the prior art motor structure, the present invention provides a method of assuring displacement of a stator relative to a stator base in an axial direction and a circumferential direction without using a conventional bonding method. It is a main object of the present invention to provide a motor structure that can prevent the occurrence of a failure and greatly improve the yield and reliability of products.

[0010] Another object of the present invention is to be able to lock the bearing in the center hole of the stator base without using the method of pressure fitting.
An object of the present invention is to provide a motor structure that can significantly improve product yield and reliability.

Another object of the present invention is to lock the circuit board as it passes through the tin plating bath, resulting in a non-uniform gap between the circuit board and the lower end of the insulating sleeve or vibration. It is an object of the present invention to provide a motor structure capable of preventing the occurrence of the above-mentioned problem, preventing the warpage and inclination of the circuit board in the armature assembly, and improving the yield and reliability of the product.

[0012]

Means for Solving the Problems To achieve the above object, an invention according to claim 1 includes a stator having a set of silicon steel plates, a stator having a central through hole, and a hollow. And a stator base having a center hole, the hub portion being formed in a cylindrical shape and being inserted into a central through-hole of the stator, and having a stator base having a center hole. From a plurality of first upright ribs arranged alternately along the same, a plurality of second upright ribs of the same number as the first upright ribs, and a lower end connecting the bottom ends of these upright ribs. And the adjacent first and second upright ribs are slightly separated from each other,
An outer locking portion is formed at an outer peripheral edge of an upper end of each of the first upright ribs, and an outer step portion is formed at a predetermined portion of an outer peripheral edge of each of the second upright ribs. The outer step portion axially locks and positions the silicon steel sheet set of the stator, has a first non-cylindrical surface on an outer peripheral surface of the hub portion, and has an inner peripheral surface of a central through hole of the stator. A second non-cylindrical surface, and positioning of the stator is performed by engaging the first non-cylindrical surface and the second cylindrical surface along a circumferential direction to lock the stator. Is what you do.

According to a second aspect of the present invention, in the motor structure according to the first aspect, the stator further surrounds a winding for generating a magnetic field of the motor and the hub.
An insulating sleeve formed in a hollow cylindrical shape for separating and electrically insulating the silicon steel sheet set and the winding, wherein the first non-cylindrical surface is formed on an outer peripheral surface of a lower end portion of the hub portion. In addition, the second non-cylindrical surface is formed on an inner peripheral surface of an insulating sleeve of the stator.

According to a third aspect of the present invention, in the motor structure according to the first aspect, the first non-cylindrical surface is formed on an outer periphery of a plurality of first upright ribs of the hub portion, and 2 The non-cylindrical surface is formed on the inner periphery of the silicon steel sheet set of the stator.

According to a fourth aspect of the present invention, in the motor structure according to the first aspect, the motor structure further includes a bearing fitted into a center hole of the hub portion, and each second portion of the hub portion. An inner locking portion is further provided on an inner periphery of an upper end of the upright rib, and further, an inner step portion is further provided at a predetermined portion of an inner circumference of each of the first upright ribs of the hub portion. The positioning is performed by locking the bearing along the axial direction by the inner step portion.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0017]

FIG. 9 is a partially exploded perspective view of a motor according to the present invention. The motor according to the present embodiment has a rotor (not shown) having a rotating shaft, and a bearing 1 that has a center hole 11 and thereby rotatably supports the rotating shaft of the rotor.
0, armature assembly A (stator 20 and circuit board 30)
) And a stator base 40.

The circuit board 30 includes a motor control circuit (not shown) for electrically controlling the operation of the motor by electrically connecting to a later-described stator winding, and a non-circular hole (for example, FIG.
And a regular octagonal hole 31 shown in FIG.

As shown in FIGS. 9 and 13, a stator 20 having a central through hole has a silicon steel sheet set 21 composed of a plurality of silicon steel sheets, and a winding (not shown) for generating a magnetic field of a motor. A hollow cylindrical insulating sleeve 22 for isolating the silicon steel plate 21 from the windings for insulation purposes.
And a plurality of positioning feet 23. In the illustrated example, the outer peripheral surface of the lower end 22L of the insulating sleeve 22 is
It is formed on a regular octagonal prism surface or another non-cylindrical surface 26 that matches the shape of the non-circular hole 31 of zero. By fitting the lower end 22L of the insulating sleeve 22 of the stator 20 into the non-circular hole 31 (FIG. 13) of the circuit board 30,
Are locked at a predetermined position along the circumferential direction to form an armature assembly A (FIG. 9).

Next, how to position the circuit board 30 with respect to the stator 20 along the axial direction in the armature assembly A will be described. 14 and 15
As shown in FIG. 16 and FIG. 16, a plurality of lower locking portions 22H (only one of which is shown in FIG. 15) are formed on the outer peripheral edge of the lower end 22L of the insulating sleeve of the stator 20. The locking portion 22H locks the edge of the non-circular hole 31 of the circuit board 30 from below. Further, a plurality of positioning feet 23 for pressing the circuit board 30 from above are formed on the stator 20, and the lower locking portions 22H and the positioning feet 23 lock the circuit board 30 in the axial direction.

As shown in FIGS. 9, 11 and 12, the stator base 40 has a base portion S for accommodating the circuit board 30.
And a hub portion T formed in a hollow cylindrical shape integrally connected to the center of the base portion S vertically and having a center hole for housing and supporting the bearing 10. The hub portion T is inserted and fitted into the central through hole of the stator 20, and its outer periphery is formed by a silicon steel sheet set 21 and an insulating sleeve 22 of the stator 20.
Surrounded by The hollow cylindrical hub portion T includes a plurality of first upright ribs 41 alternately arranged along the circumferential direction, a same number of second upright ribs 42, and these upright ribs 41, 4.
The first upright rib 41 and the second upright rib 42 that are adjacent to each other are slightly separated from each other. An outer locking portion 4 is provided on the outer peripheral edge of the upper end of each first upright rib 41.
4 is formed, and an outer step portion 47 is formed at a predetermined position on the outer peripheral edge of each second upright rib 42, and the silicon steel plate set of the stator 20 is formed by the outer locking portion 44 and the outer step portion 47. 21 is locked at a predetermined position along the axial direction.

In addition, a first non-cylindrical surface 46 (FIGS. 9 and 11) is formed on the outer peripheral surface of the lower end portion 43 of the hub portion T of the stator base 40, and the inner peripheral surface of the insulating sleeve 22 of the stator 20 is formed. At the corresponding position, the second non-cylindrical surface 24 (FIG. 1)
By forming 4), the stator 20 fitted on the outer periphery of the hub portion T of the stator base 40 is fixed in a predetermined circumferential direction by fitting the first non-cylindrical surface 46 and the second non-cylindrical surface 24. Can be locked in position. In addition, the first
A non-cylindrical surface may be provided on the outer peripheral surface 49 (FIGS. 9 and 11) of the plurality of first upright ribs 41 of the hub portion T. Correspondingly, the second non-cylindrical surface of the stator 20 is
On the inner peripheral surface 25 (FIG. 14). By fitting these first non-cylindrical surfaces and the corresponding second non-cylindrical surfaces, the stator 20 can be locked at a predetermined position along the circumferential direction. Each of the non-cylindrical surfaces may be a regular octagonal prism surface, but is not limited thereto.

Referring to FIGS. 11 and 12, the hub portion T
An inner locking portion 45 is further formed on the inner periphery of the upper end of each of the second upright ribs 42, and the first upright ribs 4 of the hub portion T are formed.
An inner step portion 48 is formed at a predetermined position on the inner periphery of the bearing 1, and the bearing 10 (FIG. 12) inserted into the center hole of the hub portion by the inner locking portion 45 and the inner step portion 48 is moved in the axial direction. Can be locked in place along.

When assembling the motor, the first portion generated by fitting the hub portion T into the central through hole of the stator 20 is formed.
When the upright rib 41 moves inward in the radial direction, the bearing 10
The first upright ribs 41 are separated from the second upright ribs 42 so as not to cause interference between the second upright ribs 42 and the radially outward movement of the second upright ribs 42 caused by fitting of the first upright ribs 42 into the hub portion T. It is located more radially outward (FIG. 17). Thereby, when assembling the motor, interference between the first upright rib 41 and the second upright rib 42 during operation can be avoided.

[0025]

According to the improved motor structure described above, displacement of the stator with respect to the stator base in the axial direction and the circumferential direction can be prevented regardless of the type of bonding.
In addition, the bearing can be locked in the center hole of the stator base without depending on the pressure fitting method. Also, when passing through the tin plating bath and performing the tin plating work, the circuit board is locked to prevent the gap between the circuit board and the lower end of the insulating sleeve from becoming uneven or causing vibration. As a result, it is possible to prevent undesirable situations such as warpage and inclination of the circuit board during armature assembly, thereby improving product yield and reliability.

Although the preferred embodiment of the present invention has been described above, this embodiment is merely an explanation of the present invention and does not limit the present invention. It is needless to say that various other modifications can be made and implemented within the spirit of the invention, and these modifications also belong to the scope of the invention.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a conventional DC motor.

FIG. 2 is a partially assembled perspective view of the motor of FIG. 1;

FIG. 3 is a perspective view showing a part of the motor shown in FIG.

FIG. 4 is a view similar to FIG. 3, showing a state where a bearing is further fitted into a center hole of the hub portion.

FIG. 5 is an exploded perspective view of an armature assembly in the conventional DC motor shown in FIG.

FIG. 6 is a partially cutaway perspective view showing how to attach a circuit board in the armature assembly of FIG. 1;

FIG. 7 is a partially enlarged perspective view of a “Y” part in FIG. 6;

8 is a sectional view in which the portion shown in FIG. 7 is turned upside down and further enlarged.

FIG. 9 is a partially exploded perspective view of the motor according to the embodiment of the present invention.

FIG. 10 is a partially assembled perspective view of the motor of FIG. 9;

FIG. 11 is a perspective view showing a part of the motor shown in FIG.

FIG. 12 is a view similar to FIG. 11, showing a state in which a bearing is further fitted inside the hub portion.

13 is an exploded perspective view of the armature assembly in the motor of the present invention shown in FIG.

FIG. 14 is a partially cutaway perspective view showing a circuit board positioning method in the armature assembly of FIG. 9;

15 is a partially enlarged view showing a lower end structure of an insulating sleeve of a stator in the motor of the present invention shown in FIG.

FIG. 16 is a partially enlarged view of an “X” part in FIG. 14;

FIG. 17 is a partially cutaway perspective view showing a non-interference design of a hub portion of a stator base of a motor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bearing 11 Center hole 20 Stator 21 Silicon steel plate set 22 Insulation sleeve 23 Positioning foot 26 Non-cylindrical surface 30 Circuit board 31 Non-circular hole 40 Stator base 41 1st upright rib 42 2nd upright rib 43 Lower end part of hub part 44 Outside Locking portion 46 First non-cylindrical surface 47 Outer step portion 48 Inner step portion 49 Outer peripheral surface of first upright rib A Armature assembly S Base portion T Hub portion

Claims (6)

(57) [Claims] 1. A stator having a silicon steel sheet set including a plurality of silicon steel sheets and having a central through hole, a hollow cylindrical shape, which is inserted and fitted into the central through hole of the stator. A motor base having a hub portion and a center hole, wherein the hollow cylindrical hub portion comprises a plurality of first upright ribs alternately arranged along a circumferential direction; It comprises a plurality of second upright ribs of the same number as the first upright ribs and a lower end connecting the bottom ends of these upright ribs. The adjacent first upright ribs and second upright ribs are slightly separated from each other. An outer locking portion is formed at an outer peripheral edge of an upper end of each of the first upright ribs, and an outer step portion is formed at a predetermined portion of an outer peripheral edge of each of the second upright ribs. And silicon steel of the stator by the outer step The plate set is locked and positioned along the axial direction, and has a first non-cylindrical surface on an outer peripheral surface of the hub portion and a second non-cylindrical surface on an inner peripheral surface of a central through hole of the stator. A motor structure characterized in that the positioning of the stator is performed by engaging the stator along the circumferential direction by fitting the first non-cylindrical surface and the second non-cylindrical surface. The stator further includes a winding for generating a magnetic field of a motor, and a hollow cylindrical shape surrounding the hub portion for isolating the silicon steel sheet set from the winding and providing electrical insulation. And the first non-cylindrical surface is formed on the outer peripheral surface of the lower end of the hub portion, and the second non-cylindrical surface is formed on the inner peripheral surface of the insulating sleeve of the stator. The motor structure according to claim 1, wherein the motor structure is formed. 3. The first non-cylindrical surface is formed on an outer periphery of a plurality of first upright ribs of the hub portion, and the second non-cylindrical surface is formed on an inner periphery of a silicon steel sheet set of the stator. The motor structure according to claim 1, wherein the motor is driven. 4. The motor structure further includes a bearing fitted into a center hole of the hub portion, and each of the hub portions has a bearing.
(2) The hub further includes an inner locking portion on the inner periphery of the upper end of the upright rib, and further has an inner step at a predetermined portion of the inner circumference of each of the first upright ribs of the hub portion. The motor structure according to claim 1, wherein positioning is performed by locking the bearing along the axial direction by the inner step portion. 5. The plurality of first upright ribs are provided more radially outside of the hub portion than the plurality of second upright ribs, so that when assembling a motor, the hub portion has a plurality of first upright ribs. Radial inward movement of the first upright rib caused by fitting into the central through hole of the stator, and radial movement of the second upright rib caused by fitting of the bearing into the center hole of the hub portion. The motor structure according to claim 4, wherein interference between the movement and the movement can be prevented. 6. The motor structure further includes a circuit board having a motor control circuit electrically connected to the winding and controlling operation of the motor, and a third non-conductive surface provided on an outer peripheral surface of a lower end of the stator. A cylindrical surface is formed, and a non-circular hole is formed in the circuit board so as to match the third non-cylindrical surface. By fitting the non-circular hole to the third non-cylindrical surface,
A plurality of lower locking portions for locking the circuit board along the circumferential direction and locking the edge of the non-circular hole of the circuit board from below at the lower end of the stator, and the stator Has a plurality of positioning feet for pressing the circuit board from above, and the circuit board is axially locked by the plurality of lower locking portions and the plurality of positioning feet. The motor structure according to claim 1.