CN216436902U - Mounting and positioning structure for stator of shell-less motor - Google Patents

Abstract

The utility model discloses an installation location structure of stator of no shell motor, no shell motor include with the coaxial rotor that sets up of electrical equipment's pivot, the cover is established in the rotor periphery and with rotor clearance fit's stator, the cross-section outline of stator is the square that has circular arc chamfer, its characterized in that: four positioning lugs are uniformly distributed on a bearing hole which surrounds the rotating shaft on a shell of the electric equipment, and the inner side surfaces of the four positioning lugs are arc surfaces which are coaxial with the bearing hole and used for limiting the corresponding arc chamfers of the end part of the stator along the radial stop. The utility model discloses an installation location structure of stator of no shell motor can be fast with the stator location, and installation simple process, the installation effectiveness is high, greatly reduced production and cost of maintenance.

Description

Mounting and positioning structure for stator of shell-less motor

Technical Field

The utility model relates to a no shell motor, especially a location structure when no shell sleeve axle servo motor's square stator is installed.

Background

The conventional motor generally comprises a rotor arranged on a rotating shaft, a stator which is sleeved on the periphery of the rotor and is in clearance fit with the rotor, a front end cover, a rear end cover, a front bearing, a rear bearing and the like. The front end cover and the rear end cover are coaxially positioned with the front end and the rear end of the stator shell through the seam allowance and are connected through bolts, and two ends of the rotating shaft are supported on the front end cover and the rear end cover through the front bearing and the rear bearing. When the structure of the traditional motor is used for driving electric equipment, the structure not only occupies larger installation space, but also needs to be provided with a transmission mechanism, such as a belt pulley and a belt or a gear transmission component, so that the cost is increased, and the consistency and the stability of the transmission are influenced.

At present, a shell-free motor with a direct-drive structure appears in the market, such as: the invention with application number of 201510016318.3 applies for a shell-less motor and a mounting method thereof, and the invention with application number of 201320888478.3 discloses a shell-less motor of a direct drive structure of a sewing machine. The direct-drive structure shell-less motor is characterized in that the rotor and a rotating shaft of the electric equipment are coaxially arranged (directly arranged on the rotating shaft of the electric equipment), the stator is sleeved on the periphery of the rotor and in clearance fit with the rotor, and one end of the stator is fixed on a shell of the electric equipment through (four) bolts. The motor has the advantages that the mechanical structure of the motor is simplified, parts such as a stator casing, an end cover and a bearing of the motor are omitted, the occupied space of the whole motor is reduced, the cost is greatly reduced, the rotor directly drives the rotating shaft of the equipment to rotate, and the consistency and the stability of transmission are improved.

However, the shell-less motor with the direct-drive structure has a technical defect which cannot be overcome in the industry so far: although the stator can be stably and reliably fixed on the shell of the electric equipment by using the (four) bolts, the coaxiality error of the rotor and the stator is large by using the bolt fixing structure. The reason for this kind of defect is that, firstly, the stator is positioned only "fixed on the housing of the electrical equipment by the bolt", and there is a gap between the bolt and the fixing hole of the stator (the gap must be present, otherwise the bolt cannot pass through the stator), secondly, there is a fit gap between the bolt and the screw hole on the housing of the electrical equipment (the gap must be present, otherwise the bolt cannot be screwed in), thirdly, the screw hole has an error in drilling positioning during the machining process, and the screw hole has an error in perpendicularity with the rotating shaft, which inevitably results in a large offset range in positioning the stator, and for a specific product, the coaxiality error between the rotor and the stator completely depends on the experience and responsibility of the assembler, and the product quality is in an unstable random state. If the coaxiality error between the rotor and the stator is large, the gap between the rotor and the stator is uneven, the magnetic induction efficiency and the running stability of the rotor are directly influenced, and even a rotor sweep accident (the outer periphery of the rotor touches the inner periphery of the stator when the rotor rotates) can happen seriously.

In order to improve the coaxiality of the stator installation of the shell-less motor, a false rotor positioning method is invented (see the attached figure 13 and the enlarged figure 14 of the part F): specially making a false rotor for stator mounting and positioning, the external diameter of said false rotor is greater than that of real rotor and less than that of stator

Before the stator is installed, the false rotor is firstly sleeved on the electric equipment

Rotating shaft of

Then the stator is sleeved on the false rotor, and then four fixing bolts are used

The stator passes through the fixing hole of the stator and is screwed in the screw hole on the shell, and then the false rotor is taken out to complete the installation of the stator. Because the outer diameter of the false rotor is larger than that of the real rotor, the offset range of the stator is reduced to a certain extent, the coaxiality between the rotor and the stator is improved, and the product quality is stable and controllable. However, this solution still has three disadvantages:

firstly, the installation technology is complicated, and the installation efficiency is lower. An operator needs to firstly sleeve the false rotor and then remove the false rotor, so that the production cost is greatly increased;

secondly, the field maintenance is not facilitated. When the shell-less motor needs to be detached or replaced in a use field, if a maintenance worker does not have a false rotor with a corresponding size, the shell-less motor cannot be installed. Even with a corresponding "dummy rotor", it is cumbersome in certain situations, for example, to simply replace the stator, to remove the rotor, attach the "dummy rotor", and after the stator has been installed, to remove the "dummy rotor" and attach the rotor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an installation location structure of stator of no shell motor can fix a position the stator fast, and installation simple process, the installation effectiveness is high, greatly reduced production and cost of maintenance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an installation location structure of stator of no shell motor, no shell motor includes the rotor with the coaxial setting of electrical equipment's pivot, overlaps and establishes in the rotor periphery and with rotor clearance fit's stator, the cross-section outline of stator is the square that has circular arc chamfer, its characterized in that: four positioning lugs are uniformly distributed on a bearing hole which surrounds the rotating shaft on a shell of the electric equipment, and the inner side surfaces of the four positioning lugs are arc surfaces which are coaxial with the bearing hole and used for limiting the corresponding arc chamfers of the end part of the stator along the radial stop.

The diameter of the inner circle where each arc surface is located is smaller than or equal to the diameter of the maximum circumscribed circle of each arc chamfer, so that the maximum circumscribed circle of each arc chamfer at the end part of the stator and the corresponding arc surface form preset interference fit.

And four arc chamfering parts of the stator are respectively provided with a fixing hole, and a bolt penetrates through the fixing hole to be in threaded connection with the screw hole in the shell so as to fix one end of the stator on the supporting surface of the shell.

Four supporting blocks are uniformly distributed around the bearing hole, the top surface of each supporting block forms the supporting surface, and the four positioning lugs are positioned at the outer side parts of the top surfaces of the corresponding supporting blocks.

The four positioning lugs and the corresponding supporting blocks are of an integral structure.

Each screw hole is positioned in the middle of the corresponding top surface.

The two outer side edges of the supporting block are perpendicular to each other to form a right angle, and the positioning lug is located at the right angle of the supporting block.

The rotor is fixedly sleeved on the rotating shaft.

Compared with the prior art, the invention has the beneficial effects that: owing to adopt above-mentioned technical scheme, surround on the casing of electrical equipment the dead eye equipartition of pivot has four location lugs, four the medial surface of location lug be with coaxial being used for of dead eye along the radial spacing arc surface of backstop to the corresponding circular arc chamfer of stator tip, this kind of structure:

1. the stopping limit of the positioning lug arc surface to the original four arc chamfers of the stator (stator punching sheet) is ingeniously utilized, the stator can be quickly positioned in advance, an operator can conveniently fix the stator on a shell of electric equipment, the operator does not need to firstly sleeve a false rotor, the situation that the false rotor is removed after the stator is installed does not exist, the installation process is simple, the installation efficiency is high, and the production cost is greatly reduced;

2. when the shell-less motor is replaced in a use field, a maintenance worker does not need a false rotor with a corresponding size, and the stator can be conveniently and quickly positioned and installed by utilizing the positioning lug, so that the maintenance cost is greatly saved, and the maintenance efficiency is improved.

The further beneficial effects are that: because the maximum external circle of each circular arc chamfer of the end part of the stator and the corresponding circular arc surface form preset interference fit, the structure can greatly improve the coaxiality precision between the rotor and the stator, not only because the circular arc surfaces are processed together when the bearing hole on the shell is processed on a machine tool, the positioning reference of the bearing hole and the circular arc surface is the same when the bearing hole and the circular arc surface are processed, the coaxiality precision of the bearing hole and the circular arc surface can be greatly improved, the coaxiality between the stator and the rotor is greatly improved, but also the technical defect that the coaxiality precision between the stator and the rotor is not high because a certain gap (the gap must be existed, otherwise the stator can not be sleeved) still exists between the inner diameter of the stator and the outer diameter of the false rotor in the prior art is overcome. The preset interference fit means that: the interference magnitude of the interference fit is preset according to the positioning and concentricity requirements of the stator, so that the requirements of the installation, the positioning and the concentricity of the stator can be met. The inner diameter of a stator within 2KW of the universal servo shell-less motor is generally 20-80 mm, the gap between the stator and a rotor is 0.3-1.0 mm, for the shell-less motor of the electric sewing machine, the inner diameter of the stator is generally 30-80 mm, the gap between the stator and the rotor is 0.5-1.0 mm, and the interference magnitude of the preset interference fit is preferably as follows: 0.00-0.08 mm; when the clearance between the stator and the rotor is small, the value of the interference magnitude of the preset interference fit can be small, and when the clearance between the stator and the rotor is large, the value of the interference magnitude of the preset interference fit can be large.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a first configuration of the bearing surface and locating tab of FIG. 1;

FIG. 3 is a second configuration of the bearing surface and locating tab of FIG. 1;

FIG. 4 is a schematic perspective view of FIG. 2;

FIG. 5 is an enlarged view of section A of FIG. 4;

FIG. 6 is a schematic perspective view of FIG. 3;

FIG. 7 is an enlarged view of section B of FIG. 6;

FIG. 8 is a schematic view of the stator assembly in a second configuration;

FIG. 9 is a schematic perspective view of FIG. 8;

FIG. 10 is a schematic illustration of the disassembled structure of FIG. 1;

FIG. 11 is an end view of the stator;

fig. 12 is a schematic structural view of stator laminations constituting a stator;

FIG. 13 is a schematic view of an installation of a prior art false rotor location;

fig. 14 is an enlarged view of portion F of fig. 13.

Detailed Description

In order to make the technical solution of the present invention clearer, the following describes the present invention in detail with reference to fig. 1 to 12. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

The utility model relates to an installation location structure of stator of no shell motor, no shell motor includes the rotor 1 with the coaxial setting of the pivot 01 of electrical equipment, and the cover is established in rotor 1 periphery and with 1 clearance fit's of rotor stator 2, the cross-section outline of stator 2 is the square that has the circular arc chamfer, surrounds on electrical equipment's casing the dead eye 7 (the dead eye that here said sets up be used for installing the bearing on the casing in order to support the pivot, the bearing that here said can be antifriction bearing, also can be slide bearing (axle sleeve), and antifriction bearing is split type, and its self inside and outside circle relative motion when rotating, slide bearing are overall structure, and relative motion between pivot and the axle sleeve when the pivot rotates) equipartition has four locating convex block 4, four locating convex block 4's medial surface be with the coaxial circular arc chamfer that is used for to stator 2 tip corresponding along radial spacing circular arc chamfer of dead head is followed to dead head to bearing hole 7 A circular arc surface 5.

Preferably, the diameter of the inner circle 05 where each arc surface 5 is located is smaller than or equal to the diameter of the maximum circumscribed circle 02 of each arc chamfer, so that the maximum circumscribed circle 02-1 of each arc chamfer on the end part of the stator 2 and the corresponding arc surface 5 form a preset interference fit. The preset interference fit means that: the interference magnitude of the interference fit is preset according to the positioning and concentricity requirements of the stator, so that the requirements of the installation, the positioning and the concentricity of the stator can be met. The inner diameter of a stator within 2KW of the universal servo shell-less motor is generally 20-80 mm, the gap between the stator and a rotor is 0.3-1.0 mm, for the shell-less motor of the electric sewing machine, the inner diameter of the stator is generally 30-80 mm, the gap between the stator and the rotor is 0.5-1.0 mm, and the interference magnitude of the preset interference fit is preferably as follows: 0.00-0.08 mm; when the clearance between the stator and the rotor is small, the value of the interference magnitude of the preset interference fit can be small, and when the clearance between the stator and the rotor is large, the value of the interference magnitude of the preset interference fit can be large.

Note that, we prefer a predetermined interference fit, but it may also be a predetermined clearance fit (the diameter of the inner circle 05 where each circular arc surface 5 is located is greater than or equal to the diameter of the maximum circumscribed circle 02 of each circular arc chamfer), as long as the clearance of the clearance fit is appropriate, for example: the stator internal diameter within the 2KW of general servo no shell motor is generally 20 ~ 80 millimeters, and the clearance between stator and the rotor is 0.3 ~ 1.0 millimeter, and to electric sewing machine's no shell motor, its stator internal diameter is generally 30 ~ 80 millimeters, and the clearance between stator and the rotor is 0.5 ~ 1.0 millimeter, and the clearance fit's that predetermines under this condition clearance is preferred: 0.00-0.25 millimeter, when the clearance between stator and the rotor is less, the value of the clearance of predetermineeing clearance fit can be some littleer, when the clearance between stator and the rotor is great, the value of the clearance of predetermineeing clearance fit can be some bigger.

Preferably, the four circular-arc chamfered portions of the stator 2 are provided with fixing holes 09, and bolts 9 penetrate through the fixing holes 09 to be screwed with screw holes 10 on the shell, so that one end of the stator 2 is fixed on the supporting surface 3 of the shell.

Preferably, four supporting blocks 11 are uniformly distributed around the bearing hole 7, the top surface of each supporting block 11 constitutes the supporting surface 3, and four positioning protrusions 4 are located at the outer side portions of the top surfaces of the corresponding supporting blocks 11. The four positioning lugs 4 and the corresponding supporting blocks 11 are of an integral structure. Each of the screw holes 10 is located at the middle of the corresponding top surface. Two outer sides of the supporting block 11 are perpendicular to each other to form a right angle, and the positioning lug 4 is located at the right angle of the supporting block 11. The rotor 1 is fixedly sleeved on a rotating shaft 01 of the electric equipment.

Preferably, when the bearing hole 7 provided in the housing is machined, the arc surface 5 and the support surface 3 are also machined, that is, the bearing hole 7, the arc surface 5 and the support surface 3 have the same machining positioning reference, and the four positioning projections 4 are positioned on the support surface 3.

The method for mounting the stator by using the mounting and positioning structure of the stator of the shell-less motor comprises the following steps:

the method comprises the following steps: one end of the stator 2 to be fixed with the supporting surface 3 faces the supporting surface 3, and then the four arc chamfers of the stator 2 are staggered with the four positioning lugs 4;

step two: placing the stator 2 towards the support surface 3 such that one end of the stator 2 contacts the support surface 3;

step three: rotating the stator 2 to enable the maximum circumcircle 02-1 of each arc chamfer at the end part of the stator 2 to form a preset interference fit with the arc surface 5 of the corresponding positioning bump 4;

step four: the bolts 9 are inserted into the fixing holes 09, and then the bolts 9 are screwed into the screw holes 10, so that one end of the stator 2 is fixed on the supporting surface 3. In the third step, when the stator 2 is rotated, the maximum circumcircle 02-1 of the arc chamfer is positioned in the middle of the arc surface 5 as much as possible, so that the fixing hole 09 is aligned with the screw hole 10, and even if the fixing hole is not aligned and has a certain dislocation, the bolt 9 can be automatically corrected when being screwed in.

Finally, the encoder assembly and grating and cover 12 are mounted to the other end of the stator 2.

In each of the above-described embodiments, in order to ensure the accuracy of the coaxiality between the rotor and the stator, it is preferable that the arc surface 5 is processed and completed together when the bearing hole 7 of the housing is processed on the machine tool, which has the following advantageous effects: the bearing hole 7 and the arc surface 5 have the same positioning standard during processing, and the coaxiality precision of the bearing hole and the arc surface can be greatly improved. In the above technical solutions, the installation of the rotor is still a conventional method, and the rotor is preferably installed after the stator is installed, which is not described herein again. In the above technical solutions, the electric device may be an electric sewing machine (as shown in fig. 1-10 of the present specification), or may be any other electric device using the shell-less motor.

Claims (8)

1. The utility model provides an installation location structure of stator of no shell motor, no shell motor includes rotor (1) with the coaxial setting of pivot (01) of electrical equipment, overlaps and establishes rotor (1) periphery and with rotor (1) clearance fit's stator (2), the cross-section outline of stator (2) is the square that has circular arc chamfer, its characterized in that: four positioning convex blocks (4) are uniformly distributed on a bearing hole (7) which surrounds the rotating shaft (01) on a shell of the electric equipment, and the inner side surfaces of the four positioning convex blocks (4) are arc surfaces (5) which are coaxial with the bearing hole (7) and used for limiting the corresponding arc chamfers at the end part of the stator (2) along the radial stop.

2. The stator mounting and positioning structure of the brushless motor as claimed in claim 1, wherein: the diameter of the inner circle (05) where each arc surface (5) is located is smaller than or equal to the diameter of the maximum circumscribed circle (02) of each arc chamfer, so that the maximum circumscribed circle (02-1) of each arc chamfer on the end part of the stator (2) and the corresponding arc surface (5) form preset interference fit.

3. The stator mounting and positioning structure of the brushless motor as set forth in claim 2, wherein: four circular arc chamfered portions of stator (2) all are equipped with fixed orifices (09), and bolt (9) pass fixed orifices (09) with screw (10) spiro union on the casing to be fixed in the one end of stator (2) on holding surface (3) of casing.

4. The stator mounting and positioning structure of a brushless motor as claimed in claim 3, wherein: four supporting blocks (11) are uniformly distributed around the bearing hole (7), the top surface of each supporting block (11) forms the supporting surface (3), and the four positioning lugs (4) are positioned at the outer side parts of the top surfaces of the corresponding supporting blocks (11).

5. The stator mounting and positioning structure of the brushless motor as claimed in claim 4, wherein: the four positioning lugs (4) and the corresponding supporting blocks (11) are of an integral structure.

6. The stator mounting and positioning structure of the brushless motor as claimed in claim 5, wherein: each screw hole (10) is positioned in the middle of the corresponding top surface.

7. The stator mounting and positioning structure of the brushless motor as claimed in claim 6, wherein: the two outer side edges of the supporting block (11) are perpendicular to each other to form a right angle, and the positioning lug (4) is located at the right angle of the supporting block (11).

8. The mounting and positioning structure of the stator of the canned motor according to any one of claims 1 to 7, wherein: the rotor (1) is fixedly sleeved on the rotating shaft (01).

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