Motor Structure

Abstract

To reduce a diameter of a motor and to miniaturize the motor without forming a through hole for a bolt at an outer edge of a stator.SOLUTION: A motor structure according to the present invention comprises: a split ring-shaped stator (5) provided inside a cylindrical case (1); a front lid (12) provided on a front side (4) of the cylindrical case (1); a rear lid (11) provided on a rear side (3) of the cylindrical case (1); a rotor rotatably provided at a shaft center position of the ring-shaped stator (5); a plurality of stator grooves (6) formed on an outer peripheral surface (5a) of the ring-shaped stator (5); and a plurality of case grooves (2) formed on an inner peripheral surface (1a) of the cylindrical case (1), in which each stator groove (6) and each case groove (2) form a complete round or non-complete round circular hole (10) with positions of the cylindrical case (1) and the ring-shaped stator (5) in a circumferential direction (50) coincident with each other, and a fastening bolt (20) penetrates into the circular hole (10).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a motor structure, and in particular to a new improvement for realizing a smaller diameter and smaller motor by assembling the motor by inserting fastening bolts into circular holes formed by a stator groove provided on the outer peripheral surface of a ring-shaped stator and a case groove provided on the inner peripheral surface of a cylindrical case. [Background technology]

[0002] An example of a motor structure of this type that has been used conventionally is the configuration disclosed in Patent Document 1. Although the configuration is not shown here, a plurality of recesses are formed at predetermined intervals on the inner peripheral surface of a cylindrical housing, and a stator is provided inside this housing. A plurality of fixing members are rotatably provided on a plurality of outer edge portions of the stator, and the head of each of the fixing members is formed of a circular arc portion and a straight portion provided as part of the circular arc portion. Therefore, when fixing the stator within the housing, the stator is installed at a predetermined position within the housing, and its position is adjusted using a jig or the like. Then, the fixing member is rotated in the same manner as a screw, so that the arc portion of the head slides into the recess in the housing. By the sliding, the arc portion applies a fixing force (F) in the radial direction to the stator, so that the housing and the stator are firmly joined together. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-185063 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional motor structures, which are configured as described above, have the following problems: In other words, the fixing members are screwed into multiple holes formed on the outer edge of the stator, and their heads are slidably fitted into the recesses in the housing to integrally join the stator and the housing. As a result, the shape of each of the holes must be large, and the diameter of the stator must be large to ensure sufficient thickness. As a result, the housing is also thick, which is a major obstacle to making motors smaller in diameter and size.

[0005] The present invention has been made to solve the above-mentioned problems, and in particular to provide a motor structure in which a tightening bolt is inserted into a perfect circular hole formed by a semicircular stator groove on the outer peripheral surface of a ring-shaped stator and a semicircular case groove on the inner peripheral surface of a cylindrical case, and the motor is assembled by tightening the bolts, thereby realizing a motor structure that realizes a small diameter and compact motor. [Means for solving the problem]

[0006] The motor structure according to the present invention includes a split-type annular stator provided inside a cylindrical case, a front cover provided on the front side of the cylindrical case, a rear cover provided on the rear side of the cylindrical case, and a rotor rotatably provided at the axial center position of the annular stator, and a rotor is provided on the outer peripheral surface of the annular stator. , for each divided portion of the ring-shaped stator The cylindrical case has a plurality of stator grooves formed therein, and a plurality of case grooves formed on the inner surface of the cylindrical case, and each of the stator grooves and each of the case grooves are positioned in the circumferential direction of the cylindrical case and the annular stator to form a circular or non-circular circular hole, and a fastening bolt passes through each of the circular holes. The stator grooves and the case grooves are configured to be semicircular with the same radius or non-identical radius, and the number of the circular holes and the number of the fastening bolts are the same or the number of the fastening bolts is smaller. Effect of the Invention

[0007] The motor structure according to the present invention is configured as described above, and therefore can provide the following effects: In a motor structure having a split-type annular stator provided inside a cylindrical case, a front cover provided on the front side of the cylindrical case, a rear cover provided on the rear side of the cylindrical case, and a rotor rotatably provided at the axial center position of the annular stator, the motor structure includes a plurality of stator grooves formed on the outer circumferential surface of the annular stator and a plurality of case grooves formed on the inner circumferential surface of the cylindrical case, the stator grooves and the case grooves are aligned with each other in the circumferential direction of the cylindrical case and the annular stator to form circular or non-circular circular holes, and a fastening bolt passes through each of the circular holes, so that no through holes for holding the fastening bolts are formed in the annular stator and the cylindrical case, and the cylindrical case and the annular stator can be thinner than before, which enables the motor to be made smaller in diameter and compact. Furthermore, since the stator groove and the case groove are semicircular with the same or different radii, the cylindrical case and the annular stator can be easily manufactured. Furthermore, by making the number of the circular holes and the number of the fastening bolts the same or smaller, a fastening state with sufficient strength can be obtained without fastening bolts in all of the circular holes. [Brief description of the drawings]

[0008] [Figure 1] 1 is an exploded perspective view showing a main part of a motor structure according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an exploded perspective view of the main part of FIG. [Diagram 3] 2 is an enlarged plan view showing a circular hole in a state where a ring-shaped stator is fitted in the cylindrical case of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The motor structure according to the present invention can obtain a motor structure with a smaller diameter and size by fastening the ring-shaped stator and the cylindrical case by inserting fastening bolts into circular or non-circular holes consisting of a stator groove on the outer peripheral surface of the split-type ring-shaped stator and a case groove on the inner peripheral surface of the cylindrical case to fasten the ring-shaped stator and the cylindrical case. EXAMPLES

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a motor structure according to the present invention will be described with reference to the drawings. In FIG. 2, reference numeral 1 denotes a cylindrical case, and case grooves 2 are formed on an inner peripheral surface 1a of this cylindrical case 1 at predetermined angular intervals. The case groove 2 is formed linearly between the rear side 3 and the front side 4 of the cylindrical case 1 .

[0011] As shown in FIG. 2, a split-core type cylindrical annular stator 5 is installed inside the cylindrical case 1 by insertion or fitting, and the assembled state is shown in the configuration of the cylindrical case 1 in FIG. 1. The outer peripheral surface 5a of the annular stator 5 is provided with stator grooves 6 which are formed at the same number and at the same angular intervals as the case grooves 2 of the cylindrical case 1. The case grooves 2 and the stator grooves 6 are semicircular with the same or different radii and are formed facing each other at the same positions in the circumferential direction 50 of the cylindrical case 1 and the annular stator 5.

[0012] When the annular stator 5 is fitted into the cylindrical case 1, as shown in Fig. 3, the grooves 2, 6 have a perfect semicircular shape, i.e., semicircular shapes with the same radius, and the positions of the cylindrical case 1 and the annular stator 5 in the circumferential direction 50 coincide with each other, so that the grooves 2, 6 form perfect circular holes 10 (Fig. 3). Also, if the grooves 2, 6 have a non-perfect semicircular shape, i.e., semicircular shapes with non-uniform radii, the non-perfect circular holes 10 can be fully utilized. As shown in FIG. 3, the circular holes 10 are formed for each of the protruding magnetic poles 8 of each of the divided cores 7 of the annular stator 5 .

[0013] As shown in FIG. 1, a rear cover 11 and a front cover 12 are respectively provided on the rear side 3 and the front side 4 of the cylindrical case 1 shown in FIG. 2 and FIG. 3 described above, and fastening bolts 20 having bolt heads 20A with a diameter larger than the diameter of the circular holes 10 are inserted into each through hole 13 of the rear cover 11 and pass through each circular hole 10 and screwed into each screw hole 21 of the front cover 12, so that the rear cover 11, the cylindrical case 1 and the front cover 12 are fastened together by the bolt heads 20A.

[0014] In the above-mentioned case, the number of fastening bolts 20 is configured to be less than the number of circular holes 10, but it is also possible to use the same number of fastening bolts 20 as the number of circular holes 10, thereby obtaining a fastening strength that is sufficient. In addition, although not shown, a well-known rotor provided on a rotating shaft provided in the front cover bearing hole 30 of the front cover 12 and the rear cover bearing hole 31 of the rear cover 11 is freely rotatably provided at the axial center position of the rotor hole 40 of the annular stator 5, i.e., in a coaxial arrangement. [Industrial Applicability]

[0015] The motor structure according to the present invention forms a circular through hole by a semicircular case groove in the cylindrical case and a stator groove in the ring-shaped stator, and the front cover, cylindrical case, ring-shaped stator and rear cover are fastened together by a fastening bolt passing through this circular hole to assemble the motor, thereby achieving a small diameter and compact motor. [Explanation of symbols]

[0016] 1 Cylindrical case 1a Inner surface 2 Case groove 3 rear side 4 Front side 5 Ring Stator 5a Outer surface 6 Stator groove 7 Split Core 8 protruding magnetic poles 10 circular hole 11 Rear lid 12 Front lid 13 Through hole 20 Fastening bolt 20A Bolt Head 21 Screw hole 30 Front cover bearing hole 31 Rear cover bearing hole 40 Rotor hole 50 Circumferential direction of the ring-shaped stator and cylindrical case

Claims

1. A motor structure having a split-type annular stator (5) provided inside a cylindrical case (1), a front cover (12) provided on a front side (4) of the cylindrical case (1), a rear cover (11) provided on a rear side (3) of the cylindrical case (1), and a rotor rotatably provided at an axial center position of the annular stator (5), a plurality of stator grooves (6) formed in an outer peripheral surface (5a) of the annular stator (5) for each divided portion of the annular stator (5); and a plurality of case grooves (2) formed in an inner peripheral surface (1a) of the cylindrical case (1), the plurality of stator grooves (6) being formed in each divided portion of the annular stator, The motor structure is characterized in that each stator groove (6) and each case groove (2) are positioned in the circumferential direction (50) of the cylindrical case (1) and the annular stator (5) to coincide with each other to form a circular or non-circular circular hole (10), and a fastening bolt (20) passes through the circular hole (10), and the stator groove (6) and the case groove (2) are semicircular with the same radius or with a non-identical radius.

2. 2. The motor structure according to claim 1, wherein the number of the circular holes (10) and the number of the fastening bolts (20) are the same or the number of the fastening bolts (20) is smaller than the number of the circular holes (10).

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