CN216356256U - Permanent magnet synchronous direct drive motor suitable for stirring - Google Patents

Abstract

The utility model provides a permanent magnet synchronous direct drive motor suitable for stirring, which comprises: motor housing, stator, rotor, main shaft, carrier bearing assembly and auxiliary bearing. The motor housing is of a hollow structure, the stator is fixedly mounted on the inner wall of the motor housing, the rotor is rotatably arranged in the motor housing, and the stator sleeve is arranged on the outer ring of the rotor. The main shaft is in driving connection with the rotor, and the bearing assembly is arranged between the main shaft and the motor housing. The bearing assembly is arranged in the middle section of the main shaft, and the auxiliary bearing is arranged at the tail end of the main shaft. According to the permanent magnet synchronous direct-drive motor suitable for stirring, the bearing structure is optimized, so that the abrasion of the bearing is reduced, the deflection degree of the main shaft is reduced, and the service life of the permanent magnet synchronous direct-drive motor is prolonged.

Description

Permanent magnet synchronous direct drive motor suitable for stirring

Technical Field

The utility model relates to the technical field of direct drive motors, in particular to a permanent magnet synchronous direct drive motor suitable for stirring.

Background

The traditional stirrer usually adopts a structural form of combining a common motor and a speed reducer, and has a series of problems of low overall efficiency, high energy consumption, high maintenance cost and the like. With the development of the technology of the permanent magnet synchronous direct-drive motor, the structural form of the permanent magnet synchronous direct-drive motor drive is gradually and widely utilized, and the structure has the advantages of high overall efficiency, low maintenance, high overload starting capability and the like. However, in the stirring process, the stirring shaft is subjected to the combined action of large bending moment and large torque, so that the shaft of the stirring shaft bears large load for a long time, and lubrication needs to be frequently added to the bearing to reduce the abrasion of the bearing. Moreover, the stirring shaft easily receives inhomogeneous radial load among the stirring process to produce the beat, adopt traditional ball bearing only to realize coaxial fixed, however, when the (mixing) shaft took place great range beat, can lead to traditional ball bearing and (mixing) shaft to take place the card phenomenon of dying, and then the damage motor.

Therefore, how to design a permanent magnet synchronous direct-drive motor suitable for stirring is to reduce the abrasion of a bearing, reduce the deflection and prolong the service life of the motor by optimizing the bearing structure, which is a technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and provides a permanent magnet synchronous direct-drive motor suitable for stirring.

The purpose of the utility model is realized by the following technical scheme:

a permanent magnet synchronous direct drive motor suitable for stirring comprises: the motor comprises a motor housing, a stator, a rotor, a main shaft, a bearing assembly and an auxiliary bearing;

the motor outer cover is of a hollow structure, the stator is fixedly arranged on the inner wall of the motor outer cover, the rotor is rotatably arranged in the motor outer cover, and the stator is sleeved on the outer ring of the rotor;

the main shaft is in driving connection with the rotor, and the bearing assembly is arranged between the main shaft and the motor housing; the bearing assembly is arranged in the middle section of the main shaft, and the auxiliary bearing is arranged at the tail end of the main shaft.

In one embodiment, the carrier-bearing assembly comprises: the device comprises a base, an upper tapered roller bearing, a lower tapered roller bearing and an end cover;

the base is arranged on one side of the motor outer cover, the end cover is arranged on the base, and the main shaft penetrates through the base and the end cover; the upper tapered roller bearing and the lower tapered roller bearing are both arranged between the main shaft and the base, the upper tapered roller bearing is positioned above the lower tapered roller bearing, and the end cover is abutted against the lower tapered roller bearing.

In one embodiment, a shaft shoulder is arranged on the main shaft, and the upper tapered roller bearing is abutted against the shaft shoulder; and the spindle is provided with a shaft sleeve which is abutted against the lower tapered roller bearing.

In one embodiment, the carrier-bearing assembly comprises: the device comprises a base, a top ring and a bottom ring;

the base is arranged on one side of the motor outer cover, the top ring is arranged on the main shaft and is positioned above the base, the bottom ring is arranged on the main shaft and is positioned below the base, an upper roller path is arranged between the top ring and the base, a lower roller path is arranged between the bottom ring and the base, and a side roller path is formed between the base and the side surfaces of the top ring and the bottom ring;

and rolling cylinders are arranged in the upper rolling path and the lower rolling path, and limiting bearings are arranged in the side rolling paths.

In one embodiment, the limit bearing comprises a fixed shaft and a rotating sleeve sleeved on the fixed shaft, the fixed shaft is of a spindle-shaped structure, and an inner cavity of the rotating sleeve is of a concave spherical structure matched with the fixed shaft.

In one embodiment, an upper channel and a lower channel are arranged in the base, the upper channel is communicated with the upper raceway, and the lower channel is communicated with the lower raceway;

the base is provided with an oil filling nozzle, the oil filling nozzle is provided with a one-way oil inlet and two oil outlets, and the two oil outlets are respectively communicated with the upper channel and the lower channel.

In one embodiment, a sealing ring is arranged between the top ring and the base, and a sealing ring is arranged between the bottom ring and the base.

In one embodiment, the rotor comprises an induction magnetic core and a connecting bracket, wherein the induction magnetic core is wound on the periphery of the connecting bracket, and the connecting bracket is sleeved on the spindle; the stator includes fixed coil, fixed coil laminating in the inner wall of motor dustcoat, induction core locates fixed coil's inboard and with fixed coil looks adaptation.

In conclusion, the permanent magnet synchronous direct-drive motor suitable for stirring reduces the abrasion of the bearing, reduces the deflection degree of the main shaft and prolongs the service life of the permanent magnet synchronous direct-drive motor by optimizing the bearing structure.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a permanent magnet synchronous direct drive motor suitable for stirring according to the utility model;

FIG. 2 is a partial cross-sectional view of the permanent magnet synchronous direct drive motor suitable for stirring shown in FIG. 1;

fig. 3 is a plan sectional view of the permanent magnet synchronous direct drive motor according to the first embodiment;

FIG. 4 is a partial schematic view of the permanent magnet synchronous direct drive motor shown in FIG. 3;

fig. 5 is a plan sectional view of the permanent magnet synchronous direct drive motor of the second embodiment;

FIG. 6 is a partial schematic view of the permanent magnet synchronous direct drive motor shown in FIG. 5;

FIG. 7 is a schematic view of the distribution of the limit bearing in the side raceway according to the second embodiment;

FIG. 8 is a schematic structural view of a limit bearing according to the second embodiment;

FIG. 9 is a schematic structural view of a fuel injection nozzle according to a second embodiment.

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present invention provides a permanent magnet synchronous direct drive motor 10 suitable for stirring, as shown in fig. 1 and 2, comprising: motor housing 100, stator 200, rotor 300, spindle 400, and carrier-bearing assembly 500 and auxiliary bearing 600. The motor housing 100 is a hollow structure, the stator 200 is fixedly mounted on the inner wall of the motor housing 100, the rotor 300 is rotatably disposed in the motor housing 100, and the stator 200 is sleeved on the outer ring of the rotor 300. The rotor 300 is in driving connection with the main shaft 400, the carrier bearing assembly 500 and the auxiliary bearing 600 are both arranged between the main shaft 400 and the motor housing 100, the carrier bearing assembly 500 is located in the middle section of the main shaft 400, and the auxiliary bearing 600 is located at the end of the main shaft 400. The main shaft 400 extends to the outside of the motor housing 100 and is in driving connection with the stirring shaft through a coupling (not shown).

In this embodiment, as shown in fig. 2 and 3, the rotor 300 includes an inductive core 310 and a connecting bracket 320, the inductive core 310 is wound around the connecting bracket 320, and the connecting bracket 320 is sleeved on the spindle 400. Preferably, the connecting bracket 320 is coupled to the main shaft 400 by a shaft-key to realize a driving connection (not shown). Further, the stator 200 includes a fixed coil 210, the fixed coil 210 is attached to an inner wall of the motor housing 100, and the induction core 310 is disposed inside the fixed coil 210 and is adapted to the fixed coil 210. In use, the stator 200 is fixed, a magnetic field is generated between the stationary coil 210 and the induction core 310, and the rotor 300 starts to rotate by the force of the magnetic field, and then the rotor 300 rotates the main shaft 400 together.

The main functions of the carrier-bearing assembly 500 of the present invention are: first, to reduce the rotational friction of the main shaft 400; secondly, the spindle is used for bearing the radial load and the axial load of the spindle 400; and thirdly, for limiting the degree of deflection of the main shaft 400. Two embodiments will now be provided to illustrate the carrier-bearing assembly 500 in more detail.

The first embodiment is as follows:

as shown in fig. 3 and 4, the carrier-bearing assembly 500 includes: a base 510, an upper tapered roller bearing 520, a lower tapered roller bearing 530, and an end cap 540. The base 510 is installed at one side of the motor housing 100, the end cap 540 is installed on the base 510, and the main shaft 400 penetrates through the base 510 and the end cap 540. The upper tapered roller bearing 520 and the lower tapered roller bearing 530 are both disposed between the main shaft 400 and the base 510, the upper tapered roller bearing 520 is located above the lower tapered roller bearing 530, and the end cap 540 abuts against the lower tapered roller bearing 530.

Further, as shown in fig. 3 and 4, a shoulder 410 is disposed on the main shaft 400, and the upper tapered roller bearing 520 abuts against the shoulder 410. The main shaft 400 is provided with a shaft sleeve 420, and the shaft sleeve 420 is mounted on the main shaft 400 through a screw 421 and abuts against the lower tapered roller bearing 530. Thus, the upper tapered roller bearing 520 and the lower tapered roller bearing 530 abut against each other, the upper end of the upper tapered roller bearing 520 abuts against the base 510 and the shoulder 410, and the lower end of the lower tapered roller bearing 530 abuts against the end cap 540, so that the upper tapered roller bearing 520 and the lower tapered roller bearing 530 are limited between the main shaft 400 and the base 510.

In use, the carrier-bearing assembly 500 is used to bear the axial and radial forces of the spindle 400, in particular: the axial force of the main shaft 400 first acts on the upper tapered roller bearing 520, then is transmitted to the base 510 through the lower tapered roller bearing 530 and the end cover 540, and then is transmitted to the motor housing 100 through the base 510; the radial force of the main shaft 400 is applied to the base 510 through the upper tapered roller bearing 520 and the lower tapered roller bearing 530, and is transmitted to the motor housing 100 through the base 510. Moreover, the structure of the upper and lower tapered roller bearings 520 and 530 has the following benefits: projection lines of all the conical surfaces are converged at the same point of the bearing axis, so that the nominal contact angle alpha of the tapered roller bearing is increased (the nominal contact angle alpha refers to an included angle between a normal line of a contact part of the rolling body and the ferrule and a radial plane of the bearing), and the larger the nominal contact angle alpha is, the stronger the axial load bearing capacity of the bearing is, so that the upper tapered roller bearing 520 and the lower tapered roller bearing 530 can better resist the axial impact force of the spindle 400 during stirring. Meanwhile, the upper tapered roller bearing 520 and the lower tapered roller bearing 530 have a positioning and aligning function, and when the main shaft 400 is subjected to a radial force and tends to swing, the tapered roller bearing can better bear a radial impact force, and the axial direction of the main shaft 400 is always kept on the same straight line with the bearing axis, so that the main shaft 400 can be limited to be deflected.

Example two:

as shown in fig. 5 and 6, the carrier-bearing assembly 500 includes: a base 510, a top ring 550, and a bottom ring 560. The base 510 is installed at one side of the motor housing 100, the top ring 550 is installed on the main shaft 400 and located above the base 510, the bottom ring 560 is installed on the main shaft 400 and located below the base 510, an upper raceway 501 is arranged between the top ring 550 and the base 510, a lower raceway 502 is arranged between the bottom ring 560 and the base 510, and a side raceway 503 is formed between the base 510 and the side surfaces of the top ring 550 and the bottom ring 560. In addition, the upper raceway 501 and the lower raceway 502 are provided with roller bodies 570, and the side raceway 503 is provided with a limit bearing 580.

In use, since the carrier bearing assembly 500 is disposed between the main shaft 400 and the motor housing 100, the base 510 is fixedly mounted on the motor housing 100, and the top ring 550 and the bottom ring 560 are mounted on the main shaft 400, the top ring 550 and the bottom ring 560 rotate together with the main shaft 400, and the roller bodies 570 support the rotation of the top ring 550 and the bottom ring 560. Specifically, as shown in fig. 5 and 6, the roller body 570 of the upper raceway 501 is located between the overhead ring 550 and the base 510, which provides a supporting force for the overhead ring 550 to balance the downward gravity of the main shaft 400; the roller bodies 570 of the lower raceway 502 are located between the bottom ring 560 and the base 510, which support the spindle 400 against axial impact forces during mixing.

Further, the stopper bearing 580 on the side raceway 503 functions at the same time as the roller body 570 functions. In this embodiment, the limiting bearings 580 are distributed in the side raceway 503 in an annular manner with the central axis of the main shaft 400 as the center, as shown in fig. 6 and 7, wherein, as shown in fig. 8, the limiting bearings 580 include a fixed shaft 581 and a rotating sleeve 582 sleeved on the fixed shaft 581, the fixed shaft 581 has a spindle-shaped structure with two thin ends and a thick middle part, and an inner cavity of the rotating sleeve 582 has a concave spherical structure matched with the fixed shaft 581. On the axial section passing through the axis of the fixed shaft 581, the plane where the maximum diameter of the fixed shaft 581 is located and the plane where the maximum diameter of the inner cavity of the rotating sleeve 582 is located are the same plane, and the maximum diameter of the inner cavity of the rotating sleeve 582 is larger than the maximum diameter of the fixed shaft 581, so that the fixed shaft 581 and the inner cavity of the rotating sleeve 582 form surface contact type matching of an arc surface; on the other hand, a clearance always exists in the matching between the two parts, and the matching clearance is gradually increased from the middle matching part to the two ends of the middle matching part.

It should be noted that the limit bearing 580 may reduce the rotational friction of the main shaft 400, or may limit the degree of yaw of the main shaft 400. The main principle is as follows: because the fixed shaft 581 is a spindle-shaped structure with thin two ends and thick middle part, the plane where the maximum diameter of the inner cavity of the rotating sleeve 582 is located should be as close to the middle part of the fixed shaft 581 as possible, when the main shaft 400 is stressed to deflect in the stirring process, a radial external force can be applied to the rotating sleeve 582, at this time, the rotating sleeve 582 firstly deflects along the direction of the external force, and then the rotating sleeve 582 makes tilting motion relative to the shaft body fulcrum of the fixed shaft 581 until the cylindrical generatrix at the outer wall of the rotating sleeve 582 is completely parallel to the cylindrical generatrix of the shaft body of the main shaft 400, so that the stable stress state of line contact between the main shaft 400 and the rotating sleeve 582 and between the rotating sleeve 582 and the fixed shaft 581 can be always ensured; moreover, the rolling friction of the rotating sleeve 582 along the fixed shaft 581 can further rapidly transmit and dissipate the impact force transmitted by the main shaft 400, which is beneficial to prolonging the service life of the load bearing assembly 500.

Furthermore, in order to provide better lubrication to the rotating top ring 550 and bottom ring 560 to reduce wear, as shown in fig. 6, in this embodiment, an upper channel 511 and a lower channel 512 are formed in the base 510, the upper channel 511 is communicated with the upper raceway 501, and the lower channel 512 is communicated with the lower raceway 502. Moreover, a grease nipple 590 is arranged on the base 510, a one-way oil inlet 591 and two oil outlets 592 (as shown in fig. 9) are arranged on the grease nipple 590, and the two oil outlets 562 are respectively communicated with the upper passage 511 and the lower passage 512. When the lubricating device is used, an operator can add liquid lubricant into the oil filling nozzle 590 through the one-way oil inlet 591, the liquid lubricant enters the upper channel 511 and the lower channel 512 through the two oil outlets 562 respectively and then enters the upper roller path 501 and the lower roller path 502 respectively to provide lubrication for the roller body 570, so that the friction coefficient between the inner wall of the upper roller path 501 and the roller body 570 is reduced, and the abrasion of the bearing assembly 500 is reduced. Meanwhile, the liquid lubricant also plays a role in cooling the roller body 570.

Preferably, as shown in fig. 6, a sealing ring 513 is disposed between the top ring 550 and the base 510, and a sealing ring 513 is disposed between the bottom ring 560 and the base 510. The sealing rings 513 act as a waterproof and dustproof to prevent water vapor from entering the carrier bearing assembly 500 through the gaps between the top ring 550 and the base 510 and between the bottom ring 560 and the base 510, which could cause corrosion of the roller body 570.

As described above, the carrier-bearing assembly 500 has the following main functions in the two embodiments: first, to reduce the rotational friction of the main shaft 400; secondly, the spindle is used for bearing the radial load and the axial load of the spindle 400; and thirdly, for limiting the degree of deflection of the main shaft 400.

The permanent magnet synchronous direct drive motor 10 suitable for stirring of the present invention further comprises an auxiliary bearing 600, and the main function of the auxiliary bearing 600 is to better position the main shaft 400. As shown in fig. 3 and 5, the auxiliary bearing 600 is provided at the end of the main shaft 400, and the auxiliary bearing 600 is sandwiched between the motor housing 100 and the main shaft 400. In the case that the main shaft 400 has a small degree of yaw, the auxiliary bearing 600 may be a conventional ball bearing; when the main shaft 400 has a large degree of yaw, the auxiliary bearing 600 may have a spindle-shaped structure of the limit bearing 580 in the second embodiment, and may be selected according to actual conditions.

In summary, the permanent magnet synchronous direct drive motor 10 suitable for stirring of the present invention reduces wear of the bearing, reduces the degree of deflection of the main shaft 400, and improves the service life of the permanent magnet synchronous direct drive motor 10 by optimizing the bearing structure.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. The utility model provides a synchronous motor that directly drives of permanent magnetism suitable for stirring which characterized in that includes: the motor comprises a motor housing, a stator, a rotor, a main shaft, a bearing assembly and an auxiliary bearing;

the motor outer cover is of a hollow structure, the stator is fixedly arranged on the inner wall of the motor outer cover, the rotor is rotatably arranged in the motor outer cover, and the stator is sleeved on the outer ring of the rotor;

the main shaft is in driving connection with the rotor, and the bearing assembly is arranged between the main shaft and the motor housing; the bearing assembly is arranged in the middle section of the main shaft, and the auxiliary bearing is arranged at the tail end of the main shaft.

2. The permanent magnet synchronous direct drive motor adapted for stirring of claim 1, wherein the carrier bearing assembly comprises: the device comprises a base, an upper tapered roller bearing, a lower tapered roller bearing and an end cover;

the base is arranged on one side of the motor outer cover, the end cover is arranged on the base, and the main shaft penetrates through the base and the end cover; the upper tapered roller bearing and the lower tapered roller bearing are both arranged between the main shaft and the base, the upper tapered roller bearing is positioned above the lower tapered roller bearing, and the end cover is abutted against the lower tapered roller bearing.

3. The permanent magnet synchronous direct drive motor suitable for stirring as claimed in claim 2, wherein a shaft shoulder is arranged on the main shaft, and the upper tapered roller bearing abuts against the shaft shoulder; and the spindle is provided with a shaft sleeve which is abutted against the lower tapered roller bearing.

4. The permanent magnet synchronous direct drive motor adapted for stirring of claim 1, wherein the carrier bearing assembly comprises: the device comprises a base, a top ring and a bottom ring;

the base is arranged on one side of the motor outer cover, the top ring is arranged on the main shaft and is positioned above the base, the bottom ring is arranged on the main shaft and is positioned below the base, an upper roller path is arranged between the top ring and the base, a lower roller path is arranged between the bottom ring and the base, and a side roller path is formed between the base and the side surfaces of the top ring and the bottom ring;

and rolling cylinders are arranged in the upper rolling path and the lower rolling path, and limiting bearings are arranged in the side rolling paths.

5. The permanent magnet synchronous direct-drive motor suitable for stirring as claimed in claim 4, wherein the limit bearing comprises a fixed shaft and a rotating sleeve sleeved on the fixed shaft, the fixed shaft is of a spindle-shaped structure, and an inner cavity of the rotating sleeve is of a concave spherical structure matched with the fixed shaft.

6. The permanent magnet synchronous direct drive motor suitable for stirring as claimed in claim 4, wherein an upper channel and a lower channel are formed in the base, the upper channel is communicated with the upper raceway, and the lower channel is communicated with the lower raceway;

the base is provided with an oil filling nozzle, the oil filling nozzle is provided with a one-way oil inlet and two oil outlets, and the two oil outlets are respectively communicated with the upper channel and the lower channel.

7. The permanent magnet synchronous direct drive motor suitable for stirring of claim 6, wherein a seal ring is arranged between the top ring and the base, and a seal ring is arranged between the bottom ring and the base.

8. The permanent magnet synchronous direct drive motor suitable for stirring of claim 1, wherein the rotor comprises an induction magnetic core and a connecting bracket, the induction magnetic core is wound on the periphery of the connecting bracket, and the connecting bracket is sleeved on the main shaft;

the stator includes fixed coil, fixed coil laminating in the inner wall of motor dustcoat, induction core locates fixed coil's inboard and with fixed coil looks adaptation.

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