JP4086135B2 - Motor structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor structure, and more particularly, one of a pair of bearings has a larger diameter than the other, and each bearing position varies along the axial direction to provide a flat type rotation detector. It relates to a new improvement for the construction.
[0002]
[Prior art]
Conventionally, as a motor structure provided with this type of rotation detector, the configuration shown in FIGS. 2 and 3 has been generally employed.
That is, what is indicated by reference numeral 1 in FIG. 2 is a front lid whose overall shape is formed in a box shape. The front lid 1 is provided with a front lid bearing 2 and a ring-shaped stator 3.
A rear cover 4 having a rear cover bearing 5 is attached to the rear end of the front cover 1, and the rear cover 4 is provided with a rotation detector stator 6 for constituting a resolver.
[0003]
A rotary shaft 7 having a rotor 9 is rotatably provided between the front lid bearing 2 and the rear lid bearing 5, and one end of the rotary shaft 7 penetrates the front lid 1 and protrudes forward.
A rotation detector rotor 8 is provided corresponding to the rotation detector stator 6 on the outer peripheral surface of the rear protrusion 7a of the front rotation shaft 7, and the rotation detector stator 6 and the rotation detector rotor 8 are provided. The rotation detector 10 which consists of a known resolver is comprised by these.
[0004]
As another conventional example, as shown in FIG. 3, the position of the rear cover bearing 5 provided on the rear cover 4 is moved to the position closest to the front cover bearing 2 and is arranged in the axial direction. . Since the other parts are the same as those in FIG. 2, the same parts are denoted by the same reference numerals and the description thereof is omitted.
[0005]
[Problems to be solved by the invention]
Since the conventional motor structure is configured as described above, the following problems exist.
That is, in the case of the first conventional example of FIG. 2, since each bearing is disposed at the outermost position in the axial direction, it is difficult to make the motor itself flat, and the structure is thick. However, it was difficult to reduce the size.
Further, in the case of the second conventional example of FIG. 3, there is a problem that the span between the respective bearings is short, so that the vibration is large and weak against the radial load.
[0006]
[Means for Solving the Problems]
The motor structure according to the present invention includes a front lid having a stator iron core provided with a front lid bearing and a stator coil , a rotary shaft having a cup-shaped rotor rotatably provided on the front lid bearing, and the front A rear cover having a rotor bearing provided at a rear portion of the cover and positioned inside the rotor; a protrusion of the rotating shaft that protrudes through the rear cover; and a rotor for rotation detector provided at the protrusion. And a rotation detector stator provided on the rear cover and positioned corresponding to the rotation detector rotor, wherein the first diameter of the front cover bearing is smaller than the second diameter of the rotor bearing. , before SL front bearing and the rotor bearing lid is disposed at different positions along the axial direction of the rotary shaft, the prior SL rotor, of the cylindrical portion with the cylindrical portion is formed on the outer edge rotor magnet is provided on the outer periphery, said With the inner position of the section are formed bent section, bearing said rotor is located in the annular recess formed between the bent portion and the tubular portion, and the rotor magnet, a cylindrical portion, The stator iron core in a diametrical direction in which the overall axial length of the rotor bearing and a part of the axial length of the front lid bearing are located inside the stator iron core and perpendicular to the axial direction It is the structure which has superposed | polymerized .
[0007]
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, reference numeral 1 denotes a front lid having an overall shape formed in a box shape. The front lid 1 is provided with a ring-shaped stator iron core 3 having a front lid bearing 2 and a stator coil 3a. It has been.
A rear lid 4 having a rotor bearing 5 is attached to the rear end of the front lid 1.
[0008]
A rotor 9 having a ring shape as a whole is integrally attached to the rotary shaft 7 in the vicinity of the front lid bearing 2, and the rotor 9 is supported by the rotor bearing 5. The shaft 7 is supported at two points by the bearings 2 and 5.
[0009]
The rotor bearing 5 is provided at the outer edge of the rotor 9 so as to support a cylindrical portion 9a provided with an outer periphery of a rotor magnet 15. The rotor 9 escapes the rotor bearing 5. In this way, the bent portion 9b is formed in a ring shape at the inner position of the cylindrical portion 9a, so that the front lid bearing 2 and the rotor bearing 5 are closer to each other in the axial direction 20 than the conventional configuration of FIG. The rotor bearing 5 is positioned in a ring-shaped recess 30 formed between the tubular portion 9a and the bent portion 9b, and the thickness of the rotor 9 is ignored.
[0010]
The first diameter D1 that is the diameter of the front lid bearing 2 is configured to be sufficiently smaller than the second diameter D2 that is the diameter of the rotor bearing 5, and the rotor bearing 5 is outside the front lid bearing 2. Therefore, as the bearing structure of the rotating shaft 7, a sufficient span can be obtained between the bearings 2 and 5, and the rotating shaft 7 is mechanically supported with sufficient strength, and the like Can be prevented.
[0011]
A rotation detector rotor 8 is provided on the protrusion 7 a of the rotation shaft 7, and a rotation detector stator 6 is provided on the rear lid 4 side. The rotation detector rotor 8 and the rotation detector stator 6 are provided. Thus, a rotation detector 10 made of a resolver is configured. Therefore, in the configuration of FIG. 1 described above, the rotor magnet 15, the cylindrical portion 9a, the total axial length of the rotor bearing 5 and a part of the axial length of the front lid bearing 2 are the stator. It is located inside the iron core 3 and overlaps with the stator iron core 3 in the diameter direction 40 perpendicular to the axial direction 20.
[0012]
【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, the front lid bearing for supporting the rotating shaft and the rotor bearing and the rotor bearing for supporting the rotor are configured with different diameters and are arranged close to each other in the axial direction. Therefore, the thickness in the axial direction can be made flat, and sufficient support rigidity of the rotating shaft can be obtained, and stable rotation without vibration can be obtained with a long span.
In addition, since the rotor bearing is located in an annular recess formed between the cylindrical portion and the bent portion of the rotor, the rotor bearing is disposed in a state of being very close to the front lid bearing in the axial direction. And the thickness in the axial direction can be made flat.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a motor structure according to the present invention.
FIG. 2 is a cross-sectional view of a conventional configuration.
FIG. 3 is a cross-sectional view of a conventional configuration.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front cover 2 Front cover bearing 3 Stator 4 Rear cover 5 Rotor bearing 6 Rotation detector stator 7 Rotating shaft 7a Projection part 8 Rotation detector rotor 9 Rotor 9a Tube part 9b Bending part D1 1st diameter D2 2nd diameter 20 Axial direction 30 annular recess
40 diameter direction

Claims (1)

A front lid (1) having a stator iron core (3) provided with a front lid bearing (2) and a stator coil (3a), and a rotor having a cup shape provided rotatably on the front lid bearing (2) A rotating shaft (7) having (9), a rear cover (4) having a bearing (5) for a rotor provided at a rear portion of the front cover (1) and positioned inside the rotor (9), and the rear cover A protrusion (7a) of the rotating shaft (7) protruding through the lid (4), a rotation detector rotor (8) provided on the protrusion (7a), and the rear cover (4) A rotation detector stator (6) positioned corresponding to the rotation detector rotor (8), and the first diameter (D1) of the front lid bearing (2) is the rotor bearing (5 ) is smaller than the second diameter (D2) of the front SL front lid bearing (2) and the rotor bearing (5) is at different positions along the axial direction (20) of said rotary shaft (7) is arranged, prior SL in the rotor (9), the cylindrical portion (9a) is formed on the outer edge Rutotomoni said tubular portion (9a) The outer peripheral rotor magnet (15) is provided, together with the bent portion (9b) is formed at the inside position of the cylindrical portion (9a), said rotor bearing (5) is the cylindrical portion and (9a) the Located in the annular recess (30) formed between the bent portion (9b), the rotor magnet (15) , the cylindrical portion (9a) , the axial length of the rotor bearing (5) , and A portion of the axial length of the front lid bearing (2) is located inside the stator iron core (3) , and the stator in the diameter direction (40) perpendicular to the axial direction (20) features and to makes the chromophore at the distal end over data structures that are polymerized with iron core (3).

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