CN209948892U

CN209948892U - Permanent magnet motor

Info

Publication number: CN209948892U
Application number: CN201920976790.5U
Authority: CN
Inventors: 张亚
Original assignee: JIANGSU KINGWAY RAILWAY COMMUNICATION EQUIPMENT Co Ltd
Current assignee: JIANGSU KINGWAY RAILWAY COMMUNICATION EQUIPMENT Co Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-01-14
Anticipated expiration: 2029-06-26

Abstract

The utility model provides a permanent magnet motor, which comprises a casing, an end cover, a rotor and a rotary transformer; one side of the end cover is provided with a rotating chamber, and the bottom of the rotating chamber is provided with a bearing chamber; the end cover is arranged at the end part of the shell in a way that the rotary transformation chamber faces away from the shell, and the rotating shaft of the rotor is fixedly arranged through a bearing assembled on the bearing chamber; the rotary transformer is assembled to the rotary transformer chamber, and a stationary portion of the rotary transformer is fixedly mounted to the end cover and a rotating portion of the rotary transformer is fixedly mounted to a rotating shaft of the rotor. The embodiment of the utility model provides a through set up at the end cover and become the room soon to assemble the resolver to changing the room soon with the mode of fixing to the end cover, be favorable to furthest to shorten the distance of resolver to the bearing, thereby can prevent to produce the vibration, improve stability and reliability, be convenient for guarantee the accuracy of the signal of gathering, the practicality is high.

Description

Permanent magnet motor

Technical Field

The utility model relates to a power electronic equipment field, more specifically say, relate to a permanent-magnet machine.

Background

With the development of science and technology, the requirements of automobiles, robots and the like on high precision, rapidity, reliability, compactness and the like of a driving system are gradually improved. When the permanent magnet motor adopts the automatic control type variable frequency speed regulation, a sensor is required to be installed to detect the angular position and the rotating speed of the rotor in real time. The rotary transformer has the advantages of high temperature resistance, humidity resistance, impact resistance, interference resistance and the like, so that the rotary transformer is widely applied.

At present, a rotary transformer is taken as a core component of a permanent magnet motor, and the reasonability of the installation mode of the rotary transformer in the permanent magnet motor determines the protection level of the rotary transformer and the whole permanent magnet motor.

As shown in fig. 1, in the conventional permanent magnet motor, the stationary part of the resolver 11 is usually fixed to the side of the cover plate 131 facing away from the end cover 13, and the rotating part of the resolver 11 is fixed to the end of the rotating shaft 121 of the rotor 12 away from the support bearing 14; however, the resolver 11 of the permanent magnet motor is installed in a manner that the resolver 11 is far away from the support bearing 14 and is prone to generate vibration during operation, so that the accuracy of signals acquired by the resolver 11 is affected, and the stability and reliability are relatively low.

Moreover, since the rotary transformer 11 is installed outside the cover plate 131 and within the blowing range of the fan 15, the dust accumulation of the rotary transformer 11 is easily caused and damaged, so that the service life of the rotary transformer 11 is affected, the sealing protection performance is poor, and the practicability of the installation mode is insufficient.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a rotary transformer to among the above-mentioned current permanent-magnet machine is far away apart from the strong point, produces the vibration easily and influences the accuracy of the signal of gathering, and stability and reliability are not enough and easy laying dust, and it is poor to influence life and sealed protection nature, and the not enough problem of mounting means practicality provides a permanent-magnet machine.

The embodiment of the present invention provides a permanent magnet motor, which includes a casing, an end cover, a rotor and a rotary transformer; one side of the end cover is provided with a rotating chamber, and the bottom of the rotating chamber is provided with a bearing chamber; the end cover is arranged at the end part of the shell in a way that the rotary transformation chamber faces away from the shell, and the rotating shaft of the rotor is fixedly arranged through a bearing assembled on the bearing chamber; the rotary transformer is assembled to the rotary transformer chamber, and a stationary portion of the rotary transformer is fixedly mounted to the end cover and a rotating portion of the rotary transformer is fixedly mounted to a rotating shaft of the rotor.

Preferably, the end cover further comprises a fan chamber, the fan chamber is positioned on one side of the swirling chamber, which faces away from the casing, and the fan chamber surrounds the periphery of the swirling chamber; the permanent magnet motor further includes a fan installed in the fan chamber, and the fan is fixed to the rotating shaft.

Preferably, the fan includes a disc portion and a plurality of blades, the plurality of blades are respectively located on one side of the disc portion facing away from the end cover, and the plurality of blades are respectively distributed along a radial direction of the disc portion.

Preferably, the middle part of the end cover protrudes towards one side back to the rotating chamber and forms a V-shaped funnel part, and the bearing chamber is positioned at the bottom of the V-shaped funnel part.

Preferably, the edge of one side of the disc part facing the end cover is provided with a first convex ring and a second convex ring which protrude from the surface and are concentrically distributed, the first convex ring is positioned on the outer side of the second convex ring, and a first annular groove is formed between the first convex ring and the second convex ring; a third convex ring and a fourth convex ring which are concentrically distributed are arranged on one side of the end cover facing the fan, the third convex ring is positioned on the outer side of the fourth convex ring, and a second annular groove is formed between the third convex ring and the fourth convex ring; when the end cover and fan are installed in place, the first raised ring projects into the second annular groove and the fourth raised ring projects into the first annular groove.

Preferably, the bearing is fitted to the bearing chamber by a sealing dynamic ring and a sealing static ring, wherein: the outer ring of the bearing is pressed and fixed to the bottom surface of the bearing chamber by the static sealing ring, and the inner ring of the bearing is pressed and fixed by the movable sealing ring sleeved on the rotating shaft.

Preferably, the stationary part of the rotary transformer is fixedly mounted on the sealing stationary ring.

Preferably, the rotary part of the rotary transformer is press-fitted and fixed to the rotary shaft of the rotor by a first bushing and a second bushing, wherein: the first shaft sleeve is limited through a shaft shoulder of the rotating shaft, and the second shaft sleeve is connected with a nut of the rotating shaft through threads and is locked and fixed.

Preferably, one side of the disc part facing the end cover is provided with a circular groove, and the middle part of the circular groove is provided with a mounting hole corresponding to the end part of the rotating shaft.

Preferably, the end cover is provided with a wiring channel for installing a cable of the rotary transformer, the wiring channel is communicated with the rotary transformer chamber, and a cable clamp is arranged in front of the end part of the wiring channel facing the rotary transformer chamber.

The utility model discloses permanent-magnet machine has following beneficial effect: through set up the room of becoming soon at the end cover to assemble the resolver to the room of becoming soon with the mode of fixing to the end cover, be favorable to furthest to shorten the distance of resolver to the bearing, thereby can prevent to produce the vibration, improve stability and reliability, be convenient for guarantee the accuracy of the signal of gathering, the practicality is high.

Furthermore, the utility model discloses permanent-magnet machine is still through setting up the fan chamber that encircles the outdoor side periphery of commentaries on classics to in locating the fan chamber with the fan, cover sealed commentaries on classics room by the fan, thereby can protect and prevent dust to rotary transformer, extension rotary transformer's life improves holistic sealed protection level.

Drawings

Fig. 1 is a schematic structural view of a prior art permanent magnet motor in partial section;

fig. 2 is a schematic structural diagram of a permanent magnet motor according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 2, the embodiment of the present invention provides a schematic structural diagram of a local profile of a permanent magnet motor, which can be applied to the field of power electronic devices, especially a permanent magnet motor with a higher protection level. The permanent magnet motor in the embodiment comprises a shell 2, an end cover 3, a rotor 4 and a rotary transformer 5; wherein: one side of the end cover 3 is provided with a rotating chamber which can be specifically positioned in the middle of one side of the end cover 3, which is opposite to the shell 2; additionally, the bottom of the rotating chamber is provided with a bearing chamber which is specifically positioned at one side of the rotating chamber facing the machine shell 2, and the installation operation can be facilitated by the arrangement in the structural mode, so that the structural rationality is improved.

The end cover 3 is arranged at the end part of the machine shell 2 in a way that the rotary transformation chamber faces away from the machine shell 2, and the rotating shaft 41 of the rotor 4 is fixedly arranged through a bearing 6 assembled on the bearing chamber and is supported and fixed by the bearing 6; then, the resolver 5 is fitted into the resolver chamber of the end cover 3, specifically, the rotating portion 52 of the resolver 5 is fixedly attached to the rotating shaft 41 of the rotor 4, and the stationary portion 51 of the resolver 5 is fixedly attached to the end cover 3, whereby the stationary portion 51 of the resolver 5 can be disposed as close as possible to the bearing 6 while ensuring the detection function of the resolver 5 to be normal.

The permanent magnet motor is simple in structure and high in feasibility by arranging the resolver chamber on the end cover 3 and assembling the resolver 5 into the resolver chamber in a manner of fixing the resolver 5 to the end cover 3, namely when the resolver 5 is installed and fixed on the end cover 3, the resolver 5 is positioned in the resolver chamber of the end cover 3; be different from current permanent-magnet machine and locate rotary transformer in the tip marginal area of pivot 41, the permanent-magnet machine of this embodiment sets up through the room of becoming soon of locating end cover 3 with rotary transformer 5 to the mounting means that is close to bearing 6, thereby can shorten rotary transformer 5 to bearing 6's distance with furthest, avoid producing the vibration from this, improve rotary transformer 5 and examine the stability and the reliability of time measuring, guarantee the accuracy of the signal that rotary transformer 5 gathered, the practicality is higher relatively.

Specifically, end cover 3 still includes the fan room, and this fan room specifically can be located the one side of changeing the room soon dorsad casing 2, and the fan room encircles the periphery that changes the room soon, is favorable to sealing the room of changing soon of installing resolver 5, improves the practicality of end cover 3 project organization.

Further, permanent-magnet machine includes fan 7, and fan 7 is installed in the fan room of above-mentioned end cover 3, and fan 7 is fixed to pivot 41, and accessible pivot 41 drives fan 7 and rotates, and then dispels the heat to the stator in casing 2, is convenient for simplify the structure, improves structure and space utilization. And, be different from current permanent-magnet machine locate the fan at the resolver side towards the end cover, this embodiment locates fan 7 in the resolver 5 one side of keeping away from end cover 3, accessible fan 7 covers sealed rotary-deformation room and forms the relatively confined installation cavity, and make resolver 5 arrange in this installation cavity, thereby can protect and prevent dust resolver 5, avoid laying dust or receive external impact damage, be favorable to prolonging resolver 7's life, improve resolver 7 and the holistic sealed protection level of permanent-magnet machine.

Of course, in practical application, a sealed cavity for protecting the rotary transformer 5 can be directly arranged on the end cover 3, but this will increase the complexity of the structure, is not beneficial to the installation operation, and has relatively low space utilization rate.

To further improve the sealing protection level, the fan 7 may specifically include a disc portion 72 and a plurality of fan blades 71, and by installing the fan 7 to the fan chamber with the disc portion 72 facing the spin chamber of the end cover 3, the entire periphery of the sealed spin chamber is surrounded by the disc portion 72, which facilitates protection and dust prevention of the resolver 5 in the spin chamber, and improves reliability of function implementation.

Besides, the plurality of blades 71 are respectively positioned on one side of the disc part 72, which is opposite to the end cover 3, and the plurality of blades 71 are respectively distributed along the radial direction of the disc part 72; specifically, a plurality of ventilation openings communicated with the inside of the casing 2 can be arranged on the periphery of the rotary variable chamber of the end cover 3, and at this time, the rotating shaft 41 of the rotor 4 rotates to drive the fan blades 71 to operate to form a heat dissipation airflow far away from the casing 2, so that the inside of the casing 2 can be cooled, and the practicability is high. In practical application, the free ends of the tail parts of the fan blades 71 can be arranged in a mode of protruding the peripheral edge of the disc part 72, so that the circulation flow of the heat dissipation air flow is accelerated, and the heat dissipation effect is improved.

Moreover, since the circular groove 721 is formed on the side of the disk part 72 of the fan 7 facing the end cap 3, when the fan 7 covers the rotary transformer chamber of the hermetic end cap 3, the circular groove 721 and the rotary transformer chamber together form a mounting cavity for mounting and fixing the rotary transformer 5, and thus, by providing the circular groove 721, the mounting cavity can be enlarged while the structural strength of the fan 7 is ensured, the space utilization rate is high, and the designability of the structure is facilitated to be improved. Additionally, the middle of the circular groove 721 is provided with a mounting hole corresponding to the end of the rotating shaft 41, and the mounting hole is matched with the shape and size of the end of the rotating shaft 41, so that the end of the rotating shaft 41 can be inserted into the mounting hole, and then the disk part 72 and the rotating shaft 41 are connected and fixed by a plurality of screws, thereby realizing synchronous operation; simple structure, and can improve joint strength, make the connection more firm reliable, improve stability and reliability.

Preferably, the middle part of end cover 3 is protruding and form V form funnel portion towards one side of back-to-back whirl room, and above-mentioned bearing chamber is located the bottom of the V form funnel portion of end cover 3, and simple structure is reasonable, and through the tip structural design mode of synthesizing permanent-magnet machine, at end cover 3 formation V nature funnel portion, can be favorable to improving the utilization ratio in space, reduces the volume of permanent-magnet machine tip, improves the integrated level. In practical application, the shape of the side of the end cover 3 facing the casing 2 can be adjusted according to practical situations, and particularly, the available space of the end structure of the permanent magnet motor can be integrated for setting.

In particular, the edge of the disc portion 72 of the fan 7 on the side facing the end cover 3 has a first and a second protruding ring protruding from the surface and concentrically arranged, wherein: the first convex ring is positioned on the outer side of the second convex ring, and a first annular groove is formed between the first convex ring and the second convex ring. Correspondingly, the side of the end cover 3 facing the fan 7 has a third and a fourth concentrically arranged convex rings, wherein: the third bulge loop is located the outside of fourth bulge loop, and is formed with the second ring channel between third bulge loop and the fourth bulge loop. Specifically, when the end cap 3 and fan 7 are in place, the first male ring projects into the second annular groove and the fourth male ring projects into the first annular groove. The connecting mode is simple and reliable in structure, is beneficial to positioning and assembling of the fan 7 and the end cover 3, is convenient to install and disassemble, and is convenient for improving the working efficiency.

Of course, in practical applications, the mounting structure between the end cover 3 and the fan 7 may also be provided by other fixing manners, for example, by providing an internal and external thread structure for threaded connection, and specifically, may be determined according to practical requirements.

In order to improve the fixing stability of the bearing 6, the bearing 6 is assembled to the bearing chamber by a seal moving ring 82 and a seal stationary ring 81, wherein: the outer ring of the bearing 6 is pressed and fixed to the bottom surface of the bearing chamber by the static sealing ring 81, and the inner ring of the bearing 6 is pressed and fixed by the dynamic sealing ring 82 which is sleeved on the rotating shaft 41. Specifically, can set up protruding card limit towards the bottom of casing 2 at the bearing chamber of end cover 3, the outer lane cover of bearing 6 is established the bearing chamber and is leaned on and carry out spacing fixed to the card limit, cooperates sealed rotating ring 82 and sealed quiet ring 81 fixed bearing 6 from this, makes the fixed more firm reliable of bearing 6, avoids the drunkenness to produce the detection precision that the vibration influences resolver 5, and stability is high.

The stationary portion 51 of the resolver 5 is attached to the end cover 3 via the stationary seal ring 81, that is, the stationary portion 51 of the resolver 5 is attached and fixed to the stationary seal ring 81, and the stationary seal ring 81 is attached to the bottom surface of the bearing chamber of the end cover 3, so that the distance between the resolver 5 and the bearing 6 in the bearing chamber can be effectively reduced, and the stability of the attachment position of the stationary portion 51 of the resolver 5 can be ensured.

To further improve the stability of the resolver 5, the rotary part 52 of the resolver 5 is press-fastened to the rotary shaft 41 of the rotor 4 by a first bushing and a second bushing, wherein: the first shaft sleeve is limited through the shaft shoulder of the rotating shaft 41, and then the second shaft sleeve is locked and fixed through a nut in the rotating shaft 41 in a threaded connection mode, so that the rotating part 52 of the rotary transformer 5 is fixed more firmly, and the detection precision is further improved. In particular, in practical application, the first shoulder for limiting the first shaft sleeve and the external thread for connecting the second shaft sleeve with threads can be respectively processed at the corresponding positions of the end part of the rotating shaft 41 facing the end cover 3, the structure is simple, the processing is convenient, and the practicability is improved.

In particular, the end cover 3 is provided with a wiring channel 31 for wiring the rotary transformer 5, the wiring channel 31 communicates with the rotary transformer chamber of the end cover 3, and the wiring channel 31 is provided with a cable clamp 32 in front of the end portion facing the rotary transformer chamber, and by providing the wiring channel 31 at the end cover 3 and providing the cable clamp 32 in the rotary transformer chamber, the cable assembly operation of the rotary transformer 5 is facilitated, the convenience and operability of the assembly of the rotary transformer 5 are improved, and the overall installation stability of the rotary transformer 5 is ensured.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A permanent magnet motor comprises a shell, an end cover, a rotor and a rotary transformer; the bearing end cover is characterized in that one side of the end cover is provided with a rotating chamber, and the bottom of the rotating chamber is provided with a bearing chamber; the end cover is arranged at the end part of the shell in a way that the rotary transformation chamber faces away from the shell, and the rotating shaft of the rotor is fixedly arranged through a bearing assembled on the bearing chamber; the rotary transformer is assembled to the rotary transformer chamber, and a stationary portion of the rotary transformer is fixedly mounted to the end cover and a rotating portion of the rotary transformer is fixedly mounted to a rotating shaft of the rotor.

2. The permanent magnet electric machine of claim 1 wherein the end cap further comprises a fan chamber located on a side of the swirling chamber facing away from the casing, the fan chamber surrounding an outer periphery of the swirling chamber; the permanent magnet motor further includes a fan installed in the fan chamber, and the fan is fixed to the rotating shaft.

3. The permanent magnet motor of claim 2, wherein the fan comprises a disk portion and a plurality of fan blades, the plurality of fan blades are respectively located on a side of the disk portion facing away from the end cover, and the plurality of fan blades are respectively distributed along a radial direction of the disk portion.

4. The permanent magnet electric machine according to claim 3, wherein the middle part of the end cover protrudes towards the side facing away from the spin chamber and forms a V-shaped funnel part, and the bearing chamber is located at the bottom of the V-shaped funnel part.

5. The permanent magnet motor according to claim 4, wherein the edge of the disc portion facing the end cover has a first protruding ring and a second protruding ring protruding from the surface and concentrically arranged, the first protruding ring is located outside the second protruding ring, and a first annular groove is formed between the first protruding ring and the second protruding ring; a third convex ring and a fourth convex ring which are concentrically distributed are arranged on one side of the end cover facing the fan, the third convex ring is positioned on the outer side of the fourth convex ring, and a second annular groove is formed between the third convex ring and the fourth convex ring; when the end cover and fan are installed in place, the first raised ring projects into the second annular groove and the fourth raised ring projects into the first annular groove.

6. The permanent magnet electric machine of claim 1, wherein the bearing is assembled to the bearing chamber by a sealing moving ring and a sealing stationary ring, wherein: the outer ring of the bearing is pressed and fixed to the bottom surface of the bearing chamber by the static sealing ring, and the inner ring of the bearing is pressed and fixed by the movable sealing ring sleeved on the rotating shaft.

7. The permanent magnet electric machine according to claim 6, wherein the stationary part of the rotary transformer is mounted and fixed on the sealing stationary ring.

8. The permanent magnet electric machine according to claim 6, wherein the rotating part of the resolver is press-fitted to the rotating shaft of the rotor by a first bushing and a second bushing, wherein: the first shaft sleeve is limited through a shaft shoulder of the rotating shaft, and the second shaft sleeve is connected with a nut of the rotating shaft through threads and is locked and fixed.

9. The permanent magnet motor of claim 3, wherein the disc portion has a circular groove on a side facing the end cap, and a mounting hole corresponding to the end of the rotating shaft is formed in a middle portion of the circular groove.

10. The permanent magnet electric machine according to claim 1, wherein the end cap is provided with a routing channel for cable installation of the resolver, the routing channel communicates with the resolver chamber, and a cable collar is provided in front of an end of the routing channel facing the resolver chamber.