CN216436903U - Stator positioning structure of shell-less motor - Google Patents

Abstract

The utility model discloses a stator location structure of no shell motor, no shell motor include rotor and stator, and the cross-section outline of stator is the square, and the dead eye equipartition of revolving shaft has four locating convex blocks on the casing, each locating convex block's medial surface be with the coaxial arc surface of dead eye, the diameter of the inner circle at each arc surface place is greater than or is equal to the diameter of the biggest circumscribed circle of each circular arc chamfer to make the biggest circumscribed circle department of each circular arc chamfer of stator tip and the arc surface rather than corresponding constitute predetermined clearance fit. The utility model discloses a stator location structure of no shell motor can be fast with the stator location to promote the axiality precision between rotor and the stator greatly, installation simple process, the installation effectiveness is high, greatly reduced production and cost of maintenance.

Description

Stator positioning structure 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 simplifies the mechanical structure, omits the stator casing, the end cover, the bearing and other parts of the motor, not only reduces the overall occupied space of the motor, but also greatly reduces the cost, and the rotor directly drives the rotating shaft of the equipment to rotate, thereby improving the consistency and the stability of transmission.

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 two drawbacks:

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 a stator location structure of no shell motor can be fast with the stator location to promote the axiality precision between rotor and the stator greatly, 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:

a stator positioning structure of a shell-less motor comprises a rotor coaxially arranged with a rotating shaft of an electric device, a stator sleeved on the periphery of the rotor and in clearance fit with the rotor, a square with a circular arc chamfer angle on the outer profile of the cross section of the stator, four positioning lugs are uniformly distributed in a bearing hole surrounding the rotating shaft on a shell of the electric equipment, the inner side surface of each positioning lug is an arc surface coaxial with the bearing hole, the diameter of an inner circle where each arc surface is located is larger than or equal to the diameter of the maximum circumscribed circle of each arc chamfer, the maximum circumcircle of each arc chamfer at the end part of the stator and the corresponding arc surface form preset clearance fit, the four arc chamfer parts of the stator are provided with fixing holes, and bolts penetrate through the fixing holes and are in threaded connection with screw holes arranged on 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 a rotating shaft of the electric equipment.

Compared with the prior art, the beneficial effects of the utility model are that: owing to adopt above-mentioned technical scheme, it has four locating convex blocks to surround the dead eye equipartition of pivot on the casing, each locating convex block's medial surface be with the coaxial arc surface of dead eye, each the diameter of the inner circle at arc surface place is greater than or is equal to the diameter of the biggest circumscribed circle of each circular arc chamfer to make the biggest circumscribed circle department of each circular arc chamfer of stator tip and rather than the corresponding arc surface of contact constitute predetermined clearance fit, this kind of structure:

1. the clearance fit between the four original arc chamfers of the stator (stator punching sheet) and the arc surfaces of the positioning lugs (namely the clearance fit meeting the positioning and concentricity requirements) is skillfully utilized, before the bolt is installed, the stator can be quickly positioned, an operator can conveniently and then pass the bolt through the fixing hole to be in threaded connection with the screw hole arranged on the shell of the electric equipment, one end of the stator is firmly fixed on the supporting surface of the shell, moreover, the positioning can meet the concentricity requirement of the stator and the rotating shaft of the electric equipment, greatly improves the coaxiality precision between the rotor and the stator, because the arc surface is processed when the bearing hole on the shell is processed on the machine tool, the bearing hole and the positioning reference of the arc surface are the same when being processed, the coaxiality precision of the bearing hole and the arc surface can be greatly improved, and the coaxiality between the stator and the rotor is greatly improved;

2. the installation process is simple, and the installation efficiency is high. An operator can easily enter the arc surface area of the positioning lug through rotation by utilizing the original arc chamfer of the stator (stator punching sheet), the installation is quick, convenient and efficient, and the preset clearance fit clearance can be smaller than the clearance between the inner diameter of the stator and the outer diameter of the false rotor due to the fact that the arc chamfer can easily enter the arc surface area of the positioning lug, so that the coaxiality precision between the rotor and the stator is further improved, particularly compared with the false rotor in the prior art, the false rotor does not need to be sleeved firstly, the false rotor does not need to be detached after the stator is installed, the production cost is greatly reduced, and the assembly efficiency and the assembly quality are improved;

3. the stator positioning lug is convenient to fix and install, the maintenance cost is greatly saved, and the efficiency is improved.

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 a stator positioning structure of a shell-less motor, the shell-less motor comprises a rotor 1 which is coaxially arranged with a rotating shaft 01 of an electric device, a stator 2 which is sleeved on the periphery of the rotor 1 and is in clearance fit with the rotor 1, the cross section outline of the stator 2 is a square with four same arc chamfers, a bearing hole 7 (the bearing hole is used for installing a bearing to support the rotating shaft and can be a rolling bearing or a sliding bearing (shaft sleeve) which is split, the inner ring and the outer ring of the bearing move relatively when rotating, the sliding bearing is of an integral structure and moves relatively between the rotating shaft and the shaft sleeve when the rotating shaft rotates) is evenly provided with four positioning lugs 4, the inner side surface of each positioning lug 4 is an arc surface 5 which is coaxial with the bearing hole 7, the arc surface 5 is processed while the bearing hole 7 arranged on the shell is processed, namely the processing positioning reference of the bearing hole 7 and the arc surface 5 is the same, so that the coaxiality of the bearing hole 7 and the arc surface 5 is improved; the diameter of the inner circle 05 where each arc surface 5 is located is larger 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 at the end part of the stator 2 and the corresponding arc surface 5 in contact with the maximum circumscribed circle form preset clearance fit (namely the clearance fit meeting the positioning and concentricity requirements); the four arc-shaped chamfered parts of the stator 2 are respectively provided with a fixing hole 09, and bolts 9 penetrate through the fixing holes 09 to be in threaded connection with screw holes 10 arranged on the shell so as to fix one end of the stator 2 on the supporting surface 3 of the shell; before the bolt 9 is installed, one end of the stator 2 is contacted with the supporting surface 3, then the stator 2 is rotated around an axis, so that the maximum circumcircle 02-1 of each arc chamfer at the end part of the stator 2 is contacted with the corresponding arc surface 5, the maximum circumcircle 02-1 of each arc chamfer at the end part of the stator 2 and the corresponding arc surface 5 contacted with the same form a preset clearance fit (namely the clearance fit meeting the requirements of positioning and concentricity), and finally the bolt 9 passes through the fixing hole 09 and is in threaded connection with a screw hole 10 arranged on a shell of the electric equipment, so that one end of the stator 2 is fixedly locked on the supporting surface 3 of the shell (at this time, the positioning lug 4 does not play a positioning role any more). This kind of clearance fit structure not only can pass the bolt with convenient operator with the stator quick positioning the fixed orifices with the screw spiro union of setting on the casing of electrical equipment afterwards, utilize the bolt firmly fixed locking of the one end of stator in on the holding surface of casing, because the location benchmark of dead eye and arc surface processing man-hour is the same moreover, their axiality precision can improve greatly for the axiality between stator and the rotor improves greatly.

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 preset clearance fit is as follows: the clearance of clearance fit is preset according to the positioning and concentricity requirements of the stator, so that the positioning and concentricity requirements of the stator can be met. The stator internal diameter within 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, under this condition the clearance of predetermined clearance fit 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, 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 (i.e. the supporting surface 3 consists of four top surfaces, and the four top surfaces are in the same plane), and four positioning protrusions 4 are located at the outer side portions of the top surfaces of the corresponding supporting blocks 11. As a further preference, the four positioning lugs 4 are integral with the respective support blocks 11; each screw hole 10 is positioned in the middle of the corresponding top surface; 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 positioned at the right angle of the supporting block 11; the rotor 1 is fixedly sleeved on a rotating shaft of the electric equipment.

A method for mounting a stator by using the stator positioning structure 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 preset clearance 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 (6)

1. The utility model provides a stator location structure 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), and 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 electric equipment, the inner side surface of each positioning convex block (4) is an arc surface (5) which is coaxial with the bearing hole (7), the diameter of an inner circle (05) where each arc surface (5) is located is larger 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 clearance fit, fixing holes (09) are formed in the four arc chamfer parts of the stator (2), and bolts (9) penetrate through the fixing holes (09) to be in threaded connection with screw holes (10) formed in the shell so as to fix one end of the stator (2) on a supporting surface (3) of the shell.

2. The stator positioning structure of the canned motor according to claim 1, 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).

3. The stator positioning structure of the canned motor according to claim 2, wherein: the four positioning lugs (4) and the corresponding supporting blocks (11) are of an integral structure.

4. The stator positioning structure of the canned motor according to claim 3, wherein: each screw hole (10) is positioned in the middle of the corresponding top surface.

5. The stator positioning structure of the case-less motor of claim 4, 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).

6. The stator positioning structure of the canned motor according to any one of claims 1 to 5, wherein: the rotor (1) is fixedly sleeved on a rotating shaft of the electric equipment.

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