JP3862844B2 - Motor structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor structure, and in particular, by inserting a bearing of a rotating shaft into an inner diameter portion of a ring-shaped stator, in order to prevent variation in fitting due to processing accuracy and imbalance of a gap between a stator and a rotor due to runout. Concerning new improvements.
[0002]
[Prior art]
Conventionally, the structure shown in FIG. 2 has been adopted as this type of motor structure. That is, what is denoted by reference numeral 1 in FIG. 2 is a ring-shaped stator having a stator winding 2 and formed in a laminated form. A pair of lid bodies 5 and 6 having the above are provided. The lid bodies 5 and 6 are fastened to each other by a fixing screw 7 penetrating the annular stator 1 in the axial direction.
Each of the bearings 3 and 4 is rotatably provided with a rotating shaft 9 having a rotor 8, and the rotor 8 is positioned corresponding to the inside of the ring-shaped stator 1.
[0003]
[Problems to be solved by the invention]
Since the conventional motor structure is configured as described above, the following problems exist. That is, since the rotating shaft of the rotor is fixed to the ring-shaped stator via the bearing and the lid, the backlash and runout of each fitting portion are varied depending on the level of processing accuracy between the rotating shaft, the bearing, the lid, and the ring-shaped stator. As a result, an imbalance (that is, misalignment) occurred in the gap between the outer diameter of the rotor and the inner diameter of the ring-shaped stator, and the rotational characteristics of the motor were adversely affected.
[0004]
The present invention has been made to solve the above-described problems, and in particular, by inserting a bearing of a rotating shaft into an inner diameter portion of the annular stator, a variation in fitting due to processing accuracy and an annular stator due to deflection are provided. It is an object of the present invention to provide a motor structure that prevents an unbalance of air gaps between rotors.
[0005]
[Means for Solving the Problems]
The motor structure according to the present invention has a rotor (8) in a pair of bearings fitted in an inner diameter portion of the annular stator in a motor structure having a rotor rotatably inside an annular stator having a stator winding. A rotary shaft (9) is rotatably held, and at each end position of each bearing and ring-shaped stator, a pair of ring-shaped lids having through-holes are provided, and each through-hole of each lid is provided with each of the through-holes. and fitting engagement only in the holding hole of a stepped the corners of the outer race of each bearing for communicating, to said respective through holes in a state in which the rear axle and front axle of the rotating shaft is released to the outside together with the bearings arranged to Rutotomoni, the annular plane end portion formed on the inner end of the outer edge of each lid is a structure that is joined to the annular flat end face which is formed at each end of the annular stator.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a motor structure according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, a reference numeral 1 denotes a ring-shaped stator having a stator winding 2 and formed in a laminated form. At the positions of the end portions 1 a and 1 b in the inner diameter portion 1 </ b> A of the ring-shaped stator 1, 1 A pair of bearings 3 and 4 are fitted and provided.
[0007]
A rotor 8 is disposed on the rotary shaft 9 rotatably provided on each of the bearings 3 and 4 so as to correspond to the ring-shaped stator 1, and a pair of ring-shaped lids having through holes 5a and 6a. wherein each of the through holes 5a of 5,6, each holding hole 5A stepped communicating with 6a, 6A are each outer rings 3a of the bearings 3, 4, 4a corner 3aa, it is fitting engagement only 4aA Accordingly, the lid bodies 5 and 6 are fixed to the positions of the end portions 1a and 1b of the annular stator 1. Further, the annular flat inner end portions 5B and 6B formed at the inner ends of the outer edges of the lid bodies 5 and 6 are joined to the annular flat end surfaces 1B and 1C formed at the respective end portions of the annular stator 1. .
Accordingly, since the bearings 3 and 4 are directly fitted into the inner diameter portion 1A of the annular stator, the gap width of the gap 10 formed in an annular shape between the outer diameter of the rotor 8 and the inner diameter portion 1A of the annular stator 1 is obtained. Becomes uniform over the entire circumference, and the rotation characteristics when the rotor 8 rotates can be improved.
Further, the front shaft 9a and the rear shaft 9b of the rotating shaft are disposed in the through holes 5a and 6a together with the bearings 3 and 4 in a state of being released to the outside.
[0008]
【The invention's effect】
Since the motor structure according to the present invention is configured as described above, the following effects can be obtained. That is, since each bearing that supports the rotating shaft is directly fitted into the inner diameter portion of the ring-shaped stator, the circle of the gap between the rotor and the inner diameter portion of the ring-shaped stator is compared with the conventional support structure via the lid. The imbalance in the circumferential direction can be made much smaller than before, and the rotational characteristics of the rotor can be greatly improved as compared with the conventional one.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a motor structure according to the present invention.
FIG. 2 is a cross-sectional view showing a conventional motor structure.
[Explanation of symbols]
1 Ring-shaped stator 2 Stator winding 1A Inner diameter part
1B, 1C Annular flat end face 3, 4 Bearing
3a, 4a Outer ring
3aA, 4aA Corner 5,6 Lid
5a, 6a Through hole 5A, 6A Holding hole
5B, 6B Ring-shaped plane inner end 8 Rotor 9 Rotating shaft
9a Front shaft
9b Rear axle

Claims (1)

In a motor structure having a rotor (8) rotatably inside an annular stator (1) having a stator winding (2), a pair of bearings fitted into the inner diameter portion (1A) of the annular stator (1) ( 3,4) rotatably holding a rotating shaft (9) having the rotor (8), and at each end position of the bearings (3,4) and the annular stator (1), through holes ( A pair of ring-shaped lids (5, 6) having 5a, 6a) are provided, and stepped holding holes (5A) communicating with the through holes (5a, 6a) of the lids (5, 6) are provided. , the corners of the outer ring (3a, 4a) of 6A) is the respective bearings (3, 4) (3aa, 4aa) only fitted to engagement, the respective through holes (5a, 6a) the axis of rotation in the ( The front shaft (9a) and the rear shaft (9b) of 9) are arranged in a state of being released to the outside together with the bearings (3,4), and the inner ends of the outer edges of the lid bodies (5, 6). annular plane end portion formed in (5B, 6B) is a motor structure which is characterized in that it is joined to annular flat end surfaces formed on each end of the annular stator (1) (1B, 1C)

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