CN107317420B - Motor Frames and Motors - Google Patents

Abstract

The present invention provides a kind of electric machine stands, which is characterized in that including driving terminal seat (31) and anti-drive end base (32), terminal seat (31) and anti-drive end base (32) is driven to be bolted together.The present invention also provides a kind of motors comprising aforementioned motor base.Distinguish with stator separately installed in two parts of split type base, there is no need to be placed through the end connecting plate inner hole at base both ends for stator in this way, also there is no need to be greater than stator core outer diameter for end connecting plate hole size, it ensure that the intensity and manufacturing requirement of stand structure, while can choose using the stator of bigger outer diameter to obtain higher output power.

Description

Motor Frames and Motors

technical field

The present invention relates to a motor frame and a motor.

Background technique

In motors, higher output power often requires larger stator outer diameter, larger outer dimensions, or the use of special design materials, all of which lead to an increase in the material cost of the motor.

In the general assembly process of the motor, the stator needs to enter the frame through the inner hole of the frame. For a frame of existing size, increasing the outer diameter of the stator means that the frame needs a larger bore, which is very difficult without increasing the size of the frame.

In addition, the increase in power will lead to more heat generation, which also means that more space is required inside the motor to meet the needs of the cooling air path inside the motor. On the premise of ensuring that the size of the motor remains unchanged, the existing motor structure cannot meet the design requirements of the air duct.

When the motor is designed with IC36 or similar cooling methods, the air outlets are on the left and right sides of the motor drive end, which will cause the axial cooling air inside the motor to flow directly out of the motor without effectively cooling the stator winding ends.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the defects in the prior art, and to provide a motor frame and a motor which can fully utilize the limited space in the frame to achieve higher power and improve the cooling effect. The structure described in the present invention is applicable to generators and electric motors, but to simplify the description, it is simply referred to as electric machines in the following description.

A motor frame is characterized in that it includes a driving end frame and a non-driving end frame, and the driving end frame and the non-driving end frame are connected together by bolts.

In one embodiment, the bottom support plate of one of the driving end frame and the non-driving frame protrudes outward, and the protruding part is provided with bolt holes, so as to connect the driving end frame and the non-driving frame by bolts The end frames are connected together.

In one embodiment, a spacer is provided between the aforementioned protruding portion and the base to be connected. Preferably, the spacer is U-shaped.

In one embodiment, a circular hole is provided at the seam between the drive end frame and the non-drive end frame, and the axial precision is ensured by inserting a cylindrical pin therein. Part of the round hole is on the drive end frame, and the other part is on the non-drive end frame.

In one embodiment, the intermediate connecting plate on the drive end frame and/or the non-drive end frame includes a first part and a second part. The first part and the second part are respectively connected with the bottom support plate.

In one embodiment, a plurality of air guide plates are arranged on the connecting plate of the drive end end of the drive end frame to prevent the cooling air flow inside the motor from being directly discharged from the air outlet ports on both sides of the frame.

The present invention also provides a motor, which is characterized in that it includes the aforementioned motor frame.

In one embodiment, the electric machine further includes a stator, wherein the iron core weld ribs are non-uniformly arranged on the circumference of the stator.

In one embodiment, there are eight iron core welding ribs on the circumference of the stator, and the angle between the two welding ribs at the top and/or the angle between the two welding ribs at the bottom is 50 ° to 70°.

The two parts of the split frame are installed separately from the stator, so that the stator does not need to pass through the inner holes of the end connecting plates located at both ends of the frame, and the size of the inner holes of the end connecting plates does not need to be larger than the outer diameter of the stator core. , to ensure the strength and manufacturability of the frame structure, and at the same time, you can choose to use a stator with a larger outer diameter to obtain higher output power. In addition, the above structure can provide larger axial ventilation holes for the axial air passage and avoid direct discharge of cooling airflow, which can better cool the motor and the winding ends, and provide a larger cooling space for the top and bottom of the stator, which It can also effectively solve the problem of high local temperature inside the motor. In addition, the output of more power with the same frame size means that the material utilization rate is improved, and less material can output more power.

Description of drawings

Figure 1 shows a cross-sectional view of a motor according to an embodiment of the invention;

Figure 2 shows an exploded view of a motor frame according to an embodiment of the invention;

Fig. 3 is the A-A sectional view of the structure shown in Fig. 1;

Fig. 4 is the B-B sectional view of the structure shown in Fig. 1;

Fig. 5 is the C-C sectional view of the structure shown in Fig. 1;

FIG. 6 shows a schematic diagram of a stator welding rib portion according to an embodiment of the present invention;

FIG. 7 shows a schematic diagram of an intermediate connecting plate according to an embodiment of the present invention; and

FIG. 8 is a D-D cross-sectional view of the structure shown in FIG. 1 .

Detailed ways

Detailed descriptions of alternative embodiments of the present invention are given below with reference to the accompanying drawings.

Figure 1 shows a cross-sectional view of a motor according to one embodiment of the invention. As shown in FIG. 1 , the motor includes a rotor (not shown), a stator 20 and a frame 30 , wherein the frame 30 includes two parts, a driving end frame 31 and a non-driving end frame 32 .

FIG. 2 shows an exemplary structure of the drive end frame 31 and the non-drive end frame 32 . Different from the traditional structure using an integrated machine base, the present invention proposes a structure using a split machine base. The drive end frame 31 and the non-drive end frame 32 are bolted together to form the entire frame 30 . More specifically, the drive end frame 31 and the non-drive end frame 32 are fastened in the axial and vertical directions through bolts, and the gap between the two in the vertical direction is filled by a gasket 35 . It is preferably U-shaped. The two parts are installed separately from the stator 20, so that the stator 20 does not need to pass through the inner holes of the end connecting plates at both ends of the machine base, and the size of the inner holes of the end connecting plates does not need to be larger than the outer diameter of the stator core, ensuring that The strength and manufacturability of the frame structure are required, and the stator with a larger outer diameter can be selected to obtain a higher output power. Therefore, the design can increase the output power of the motor without changing the center height and the dimensions of length, width and height.

In order to ensure the above-mentioned requirements for strength, assembly accuracy and repeat positioning accuracy of the split frame, first, the bottom support plate 33 of the drive end frame 31 extends beyond the main body of the drive end frame 31 to support the non-drive end frame 32. The protruding bottom support plate 33 is provided with a bolt hole, and the bolt passes through the bolt hole to connect the drive end frame 31 and the non-drive end frame 32 together. Preferably, the bolt holes are not arranged in a straight line, but in a zigzag arrangement. This structure can improve the overall stiffness of the motor, and the motor can operate in a wider operating frequency range. Of course, the reverse setting is also possible. The gasket 35 is cushioned between the upper surface of the bottom support plate 33 of the drive end frame 31 and the lower surface of the non-drive end frame 32 to facilitate the disassembly and assembly of the frame. Since the drive end frame 31 and the non-drive end frame 32 need to be engaged in both horizontal and vertical directions, arranging the spacer 35 in the vertical direction can make the engagement in both directions easier.

FIG. 3 is an A-A cross-sectional view of the structure shown in FIG. 1 . The stator 20 is connected with the drive end frame 31 and the non-drive end frame 32 through the interference and spring pins, respectively. As shown in FIG. 3 , the connecting plate 36 of the driving end on the frame 30 is directly connected with the outer periphery of the stator through bolts, so as to fix the position of the stator. This structure can increase the diameter of the stator as much as possible on the premise of ensuring the strength of the connecting plate 36 at the end of the driving end.

FIG. 4 is a B-B cross-sectional view of the structure shown in FIG. 1 , and FIG. 5 is a C-C cross-sectional view of the structure shown in FIG. 1 . As shown in FIGS. 4 and 5 , a cylindrical pin 34 is used between the drive end frame 31 and the non-drive end frame 32 to ensure axial accuracy. At the connection between the upper surface of the bottom support plate 33 of the driving end frame 31 and the lower surface of the non-driving end frame 32, a circular hole is opened, a part of the circular hole is located on the upper surface of the supporting plate 33, and the other part is located at the non-driving end. The lower surface of the base 32 is such that after the cylindrical pin 34 is inserted into the circular hole, a part is in contact with the support plate 33 of the drive-end base 31 , and the other part is in contact with the non-drive-end base 32 . After the drive end frame 31 and the non-drive end frame 32 are respectively assembled with the stator 20, the cylindrical pin 34 installed at the seam between the drive end frame 31 and the non-drive end frame 32 can ensure the safety of the frame after disassembly and assembly. Repeatability.

Figure 6 shows a cross-sectional view of a stator according to an embodiment of the present invention. As shown in FIG. 6 , the eight iron core welding ribs 21 to 28 on the circumference of the stator 20 are non-uniformly arranged. Preferably, the angle between the two welding ribs 21 and 28 at the top is between 50° and 70°, for example, 60°, which can provide more space for the axial air passage at the top of the motor. The angle between the two welding ribs 24 and 25 is also, for example, between 50° and 70°, for example, 60°. Meanwhile, in order to avoid the lateral upper limit of the stator size, the angle between the two welding ribs 26 and 27 on the left and the two welding ribs 22 and 23 on the right is, for example, about 45°, and the remaining angles are equally distributed. It should be understood that the above-mentioned degrees of the included angle are only examples. The larger core outer diameter further reduces the available space inside the frame, especially the top and bottom. Non-uniformly distributed welding rib positions can increase the ventilation area at the top and bottom of the motor, which has a good effect on improving the local temperature rise of the motor.

FIG. 7 shows a schematic diagram of an intermediate connecting plate according to an embodiment of the present invention. The driving end frame 31 and the non-driving end frame 32 are respectively provided with intermediate connecting plates 50 . Different from the traditional design, the intermediate connecting plate 50 of the present invention adopts a split design, that is, includes a first part 51 and a second part 52 . The first part 51 and the second part 52 are connected with the bottom support plate 33, respectively. This can not only improve the material utilization rate, but also increase the axial ventilation area to ensure the cooling effect inside the motor. Of course, it should be understood that the intermediate connecting plates 50 on the drive end frame 31 and the non-drive end frame 32 may both be of split design, or one of them may be of a split design.

FIG. 8 is a D-D cross-sectional view of the structure shown in FIG. 1, showing a schematic diagram of a drive end end connecting plate according to an embodiment of the present invention. A plurality of wind deflectors 37 are provided on the end connecting plate 36 of the driving end. In the prior art, the cooling airflow inside the motor is directly discharged from the air outlet openings on both sides of the frame at the drive end, without effectively cooling the stator winding ends. By arranging the wind deflector 37 on the connecting plate 36 at the end of the driving end, the internal air flow can be prevented from being directly discharged to the outside of the motor, but kept flowing at the end of the motor for a period of time, thereby better cooling the winding end and improving the cooling effect of the motor.

The above structure can choose to use a stator with a larger outer diameter to obtain a higher output power, and at the same time provide a larger axial ventilation hole 38 for the axial air passage and avoid the direct discharge of the cooling airflow, which can better cool the motor and windings end, and provide a larger cooling space for the top and bottom of the stator, which can also effectively solve the problem of excessive local temperature inside the motor. In addition, the output of more power with the same frame size means that the material utilization rate is improved, and less material can output more power.

The above are only the principles and preferred embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (7)

1. A motor stand, characterized in that, comprising a drive end stand (31) and a non-drive end stand (32), and the drive end stand (31) and the non-drive end stand (32) are connected to each other by bolts. Together; The bottom support plate (33) of the drive end frame (31) extends beyond the main body of the drive end frame (31) to support the non-drive end frame (32); the protruding bottom support plate (33) is provided with There are a plurality of bolt holes arranged in a zigzag shape, and the bolts pass through the bolt holes to connect the drive end frame (31) and the non-drive end frame (32) together; A split-type intermediate connecting plate (50) is respectively provided on the driving end frame (31) and the non-driving end frame (32); The split-type intermediate connecting plate (50) includes a first part (51) and a second part (52), wherein a gap is provided between the first part (51) and the second part (52); The first part (51) and the second part (52) are respectively connected with the bottom support plate (33). 2 . The motor frame according to claim 1 , wherein a gasket ( 35 ) is arranged between the protruding bottom support plate and the non-drive end frame to be connected. 3 . 3. The motor base according to claim 2, wherein the gasket (35) is U-shaped. 4. The motor base according to any one of claims 1 to 3, characterized in that a round hole is provided at the seam between the drive end base (31) and the non-drive end base (32), and Axial accuracy is ensured by inserting cylindrical pins (34) therein. 5. The motor frame according to any one of claims 1 to 3, wherein a plurality of wind deflectors (37) are provided on the drive end end connecting plate (36) of the drive end frame (31). ), which is used to prevent the cooling airflow inside the motor from being directly discharged from the air outlet openings on both sides of the base, and keep the internal airflow at the end of the motor for a period of time. 6. A motor, characterized in that it comprises the motor frame according to any one of claims 1 to 5. 7. The motor according to claim 6, further comprising a stator (20), wherein the iron core welding ribs on the circumference of the stator (20) are non-uniformly arranged; There are eight iron core welding ribs on the circumference of the stator (20), and the included angle between the two welding ribs at the top and the included angle between the two welding ribs at the bottom is between 50° and 70°; , in order to avoid the lateral upper limit of the size of the stator, the angle between the two welding ribs on the left and the two welding ribs on the right is about 45°, and the remaining angles are equally distributed.