Permanent magnet motor skewed pole rotor shaft pressing tool

Abstract

The utility model relates to a shaft pressing tool for a skewed pole rotor of a permanent magnet motor, the skewed pole rotor comprises a motor shaft and a rotor assembly sleeved on the outer side wall of the motor shaft, and the shaft pressing tool comprises a pressing column, a guide assembly and a positioning tool which are coaxially arranged; the pressing column is detachably and fixedly installed on a hydraulic machine pressing head and used for pressing a motor shaft downwards. The positioning tool is detachably and fixedly installed on the guiding assembly and used for achieving outer circle positioning of the rotor assembly. The guiding assembly is detachably and fixedly installed on the hydraulic machine bottom plate and used for achieving inner circle positioning of the rotor assembly, angle deviation of the rotor assembly and positioning guiding of a motor shaft. The press-fitting tool has the advantages of reducing press-fitting procedures, being high in press-fitting efficiency, low in rejection rate and the like.

Description

Technical Field

[0001] The utility model relates to a shaft pressing tool, in particular to a shaft pressing tool for a permanent magnet motor oblique pole rotor, and belongs to the technical field of motor rotor pressing. Background Art

[0002] In the field of motors, in order to weaken tooth harmonics and improve motor tooth torque and torque pulsation, the rotor is arranged in a segmented skewed pole manner. Specifically, the motor rotor is divided into multiple rotor cores, and each rotor core is deflected at a certain skew angle and then pressed together to form a skewed pole rotor assembly.

[0003] During the press-fitting process, the interaction force between the rotor core sections when they are close together will make the assembly process more laborious. In addition, it is difficult to ensure that the rotor core sections are pressed according to the target angle during assembly, resulting in low assembly efficiency. Utility Model Content

[0004] The utility model mainly aims at the above problems existing in the prior art and provides a shaft pressing tool for a skewed-pole rotor of a permanent magnet motor.

[0005] The purpose of this utility model is mainly achieved through the following solutions:

[0006] A permanent magnet motor skewed pole rotor pressing tool, the skewed pole rotor includes a motor shaft and a rotor assembly sleeved on the outer side wall of the motor shaft, the pressing tool includes a coaxially arranged pressing column, a guide assembly and a positioning tool; the pressing column is detachably fixedly mounted on the hydraulic press head and is used to press the motor shaft downward; the positioning tool is detachably fixedly mounted on the guide assembly and is used to achieve outer circle positioning of the rotor assembly; the guide assembly is detachably fixedly mounted on the bottom plate of the hydraulic press and is used to achieve inner circle positioning of the rotor assembly, angular deviation of the rotor assembly and positioning and guiding of the motor shaft.

[0007] Preferably, the lower end of the pressure column is provided with a first placement groove for placing the upper end of the motor shaft, and the first placement groove is a trumpet-shaped structure.

[0008] Preferably, the positioning tooling includes a positioning sleeve and a first connecting plate connected to the bottom of the outer wall of the positioning sleeve. The positioning sleeve is a semi-cylindrical structure with openings at both ends. The outer wall of the rotor assembly is adapted to the inner wall of the positioning sleeve. The first connecting plate is detachably fixedly connected to the guide assembly.

[0009] Preferably, the inner side wall of the positioning sleeve is provided with a long narrow key and a short narrow key adapted to the notch of the rotor assembly.

[0010] Preferably, the guide assembly includes a flange sleeve, a guide shaft, a rotor positioning plate, a linear bearing, a telescopic spring, a spring positioning pin and a cover plate, the flange sleeve includes a guide cylinder with openings at both ends and a second connecting plate connected to the top of the outer wall of the guide cylinder, a second placement groove is opened at the upper end of the guide cylinder, the rotor positioning plate is detachably fixedly installed in the second placement groove, and a through hole is provided in the middle of the rotor positioning plate for the guide shaft to pass through.

[0011] Preferably, a third placement groove is provided in the middle of the upper surface of the rotor positioning plate, the lower end of the rotor assembly is placed in the third placement groove, and the side wall of the third placement groove is provided with a positioning key adapted to the notch of the rotor assembly.

[0012] Preferably, the linear bearing is vertically installed in the guide cylinder, and the outer wall of the linear bearing is in contact with the inner wall of the guide cylinder.

[0013] Preferably, the cover plate is detachably fixedly mounted on the bottom of the guide cylinder, and the spring locating pin is detachably fixedly mounted on the middle of the upper surface of the cover plate, the telescopic spring is installed inside the linear bearing, and the bottom end of the telescopic spring is sleeved on the outer wall of the spring locating pin.

[0014] Preferably, the bottom end of the guide shaft is inserted into the upper end of the telescopic spring, and a limiting portion is provided at the lower part of the guide shaft, the limiting portion is inserted into the linear bearing, and the diameter of the limiting portion is larger than the inner diameter of the through hole.

[0015] Preferably, the upper end of the guide shaft passes through the rotor positioning plate and the rotor assembly, and a fourth placement groove is opened at the upper end of the guide shaft, and the lower end of the motor shaft is inserted into the fourth placement groove.

[0016] Therefore, compared with the prior art, the utility model has the following advantages:

[0017] (1) The utility model facilitates the centering operation of the motor shaft into the rotor assembly by providing a telescopic spring and a guide shaft, thereby reducing the press-fitting process and saving time;

[0018] (2) The utility model provides a rotor assembly, a positioning tool and a rotor positioning plate, and the long narrow key, the short narrow key of the positioning tool and the positioning key of the rotor positioning plate facilitate the angular deviation and positioning of each rotor assembly, and can press-fit the rotor assembly and the motor shaft at one time, with high assembly efficiency, which can meet mass production requirements;

[0019] (3) The utility model provides a linear bearing, which is used to support and guide the guide shaft, so that the entire press-fitting process has high precision, strong sensitivity and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the medium-pressure column of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the motor shaft in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the guide shaft in the utility model;

[0024] Figure 5 It is a cross-sectional view of the rotor positioning plate in the utility model;

[0025] Figure 6 It is a top view of the rotor positioning plate in the utility model;

[0026] Figure 7 It is a structural schematic diagram of the flange sleeve in the utility model;

[0027] Figure 8 It is a structural schematic diagram of the positioning tooling in the utility model;

[0028] Fig. 9 It is the front view of the positioning tool in the utility model;

[0029] Fig.10 It is a structural schematic diagram of the rotor assembly in the utility model;

[0030] Fig.11 It is a schematic diagram of the structure of the utility model during press-fitting.

[0031] Illustrations: 1-motor shaft, 2-pressure column, 3-first placement groove, 4-positioning sleeve, 5-first connecting plate, 6-long narrow key, 7-short narrow key, 8-flange sleeve, 9-guide shaft, 10-rotor positioning plate, 11-linear bearing, 12-telescopic spring, 13-spring positioning pin, 14-cover plate, 15-guide cylinder, 16-second connecting plate, 17-positioning tooling, 18-second placement groove, 19-through hole, 20-third placement groove, 21-positioning key, 22-limiting part, 23-fourth placement groove, 24-first rotor assembly, 25-second rotor assembly, 26-third rotor assembly, 27-first notch, 28-second notch, 29-third notch, 30-step portion. DETAILED DESCRIPTION

[0032] The technical solution of the utility model is further described in detail below through specific embodiments and in combination with the accompanying drawings. It should be understood that the implementation of the utility model is not limited to the following embodiments, and any form of modification and / or change made to the utility model will fall within the protection scope of the utility model.

[0033] In the present invention, unless otherwise specified, all parts and percentages are weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the field. The methods in the following embodiments, unless otherwise specified, are conventional methods in the field. The components or equipment in the following embodiments, unless otherwise specified, are universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods.

[0034] Embodiment 1:

[0035] like Figure 1 As shown, the utility model provides a technical solution, a permanent magnet motor skewed pole rotor pressing tool, the skewed pole rotor is composed of a motor shaft 1 and a rotor assembly sleeved on the outer wall of the motor shaft 1, and the pressing tool is composed of a coaxially arranged pressing column 2, a guide assembly and a positioning tool 17.

[0036] like Figure 3 As shown, in this embodiment, the outer side wall of the motor shaft 1 is integrally provided with a circle of protruding step portions 30, and the rotor assembly is composed of a first rotor assembly 24, a second rotor assembly 25 and a third rotor assembly arranged in sequence from bottom to top, as shown in FIG. Fig.10 As shown, the first rotor assembly 24, the second rotor assembly 25 and the third rotor assembly have the same structure, and three groups of notches are evenly arranged on the outer edges thereof, each group of notches consists of a first notch 27, a second notch 28 and a third notch 29, wherein a small notch is further provided on one side of the third notch 29 for distinguishing it from the first notch 27. When the three-section rotor assembly is assembled, the NS poles can be automatically distinguished, without manual confirmation of the NS pole polarity or the oblique pole angle, which can be ensured by positioning tooling. In addition, the setting of the notches can reduce torque fluctuations, improve motor efficiency and reduce losses.

[0037] The pressure column 2 is detachably fixedly mounted on the pressure head of the hydraulic press and is used to press the motor shaft 1 downward. The pressure column 2 can be connected to the pressure head of the hydraulic press by bolt connection, thread connection or other detachable connection methods.

[0038] The positioning fixture 17 is detachably fixedly mounted on the guide assembly to achieve outer circle positioning of the rotor assembly.

[0039] The guide assembly is detachably fixedly mounted on the bottom plate of the hydraulic press, and is used to achieve inner circle positioning of the rotor assembly, angular offset of the rotor assembly, and positioning and guiding of the motor shaft 1 .

[0040] Embodiment 2:

[0041] like Figure 1 , 2As shown, the utility model provides another technical solution, a permanent magnet motor oblique pole rotor pressing tool, which is different from Example 1 in that a first placement groove 3 for placing the upper end of the motor shaft 1 is provided at the lower end of the pressing column 2, and the first placement groove 3 is a trumpet-shaped structure to facilitate the positioning and installation of the motor shaft 1.

[0042] Embodiment 3:

[0043] like Figure 1 , 8 As shown in Figure 9, the utility model provides another technical solution, a permanent magnet motor skew pole rotor pressing tooling, which is different from Example 1 in that the positioning tooling 17 is composed of a positioning sleeve 4 and a first connecting plate 5 integrally arranged at the bottom of the outer wall of the positioning sleeve 4, the positioning sleeve 4 is a semi-cylindrical structure with openings at both ends, the outer wall of the rotor assembly is matched with the inner wall of the positioning sleeve 4, and the first connecting plate 5 is detachably fixed to the guide assembly by bolts.

[0044] Specifically, the inner wall of the positioning sleeve 4 is provided with a long narrow key 6 and a short narrow key 7 which are adapted to the notch of the rotor assembly, wherein the short narrow key 7 is located at the upper part of the inner wall of the positioning sleeve 4, and the upper ends of the long narrow key 6 and the short narrow key 7 are chamfered guides and the side walls are made into arc transitions, so that the rotor assembly is not easily damaged during the assembly process and bumps are reduced.

[0045] Embodiment 4:

[0046] like Figure 1 As shown, the utility model provides another technical solution, a permanent magnet motor skew pole rotor pressing tooling, which is different from Example 1 in that the guide assembly is composed of a flange sleeve 8, a guide shaft 9, a rotor positioning plate 10, a linear bearing 11, a telescopic spring 12, a spring positioning pin 13 and a cover plate 14.

[0047] Specifically, Figure 7 As shown, the flange sleeve 8 is composed of a guide cylinder 15 with openings at both ends and a second connecting plate 16 integrally arranged on the top of the outer side wall of the guide cylinder 15. The first connecting plate 5 is fixedly connected to the second connecting plate 16 by bolts, and the second connecting plate 16 is also detachably fixedly connected to the bottom plate of the hydraulic press by bolts. A second placement groove 18 is opened at the upper end of the guide cylinder 15, and the rotor positioning plate 10 is detachably fixedly installed in the second placement groove 18 by bolts.

[0048] like Figure 5 , 6As shown, a through hole 19 is provided in the middle of the rotor positioning plate 10 for the guide shaft 9 to pass through, wherein the guide shaft 9 is clearance-fitted with the rotor positioning plate 10 and the rotor assembly; a third placement groove 20 is provided in the middle of the upper surface of the rotor positioning plate 10, and the lower end of the first rotor assembly 24 is placed in the third placement groove 20, and the side wall of the third placement groove 20 is provided with a positioning key 21 adapted to the notch of the first rotor assembly 24. In this embodiment, when the rotor assembly is sleeved with the guide shaft 9 and placed on the rotor positioning plate 10, the positioning key 21 cooperates with the second notch 28 of the first rotor assembly, the long narrow key 6 of the positioning tool 17 cooperates with the first notch 27 of the second rotor assembly 25, and the short narrow key 7 of the positioning tool 17 cooperates with the third notch 29 of the third rotor assembly 26, and the positioning key 21, the long narrow key 6 and the short narrow key 7 are separated at a certain angle to ensure that each section of the rotor assembly is positioned according to the target oblique angle, and the specific separation angle is determined according to actual needs.

[0049] Specifically, the linear bearing 11 is vertically installed in the guide cylinder 15 , and the outer wall of the linear bearing 11 is in contact with the inner wall of the guide cylinder 15 .

[0050] Specifically, the cover plate 14 is detachably fixed to the bottom of the guide cylinder 15 by bolts, and the spring positioning pin 13 is detachably fixed to the middle of the upper surface of the cover plate 14 by bolts, the telescopic spring 12 is installed inside the linear bearing 11, and the bottom end of the telescopic spring 12 is sleeved on the outer wall of the spring positioning pin 13.

[0051] like Figure 4 As shown, the bottom end of the guide shaft 9 is inserted into the upper end of the telescopic spring 12 , and a limiting portion 22 is provided at the lower part of the guide shaft 9 . The limiting portion 22 is inserted into the linear bearing 11 , and the diameter of the limiting portion 22 is greater than the inner diameter of the through hole 19 .

[0052] Specifically, the upper end of the guide shaft 9 passes through the rotor positioning plate 10 and the rotor assembly. Under the action of the telescopic spring 12, the upper part of the guide shaft 9 extends out of the end surface of the flange sleeve 8. At this time, the limiting portion 22 of the guide shaft 9 presses against the bottom surface of the rotor positioning plate 10 to achieve limiting. In addition, a fourth placement groove 23 is opened at the upper end of the guide shaft 9, and the lower end of the motor shaft 1 is inserted into the fourth placement groove 23.

[0053] Since the magnetic steel in the rotor assembly is magnetic, the pressure column 2, the rotor positioning plate 10, the guide shaft 9, and the flange sleeve 8 are all made of aluminum alloy or other non-magnetic materials.

[0054] Since the rotor assembly and the motor shaft 1 are interference fit, the rotor assembly needs to be preheated in advance.

[0055] The utility model provides a permanent magnet motor skew pole rotor pressing tool, and its working process is as follows: Figure 1 , 11As shown, in the initial state, the pressure column 2 is fixed on the hydraulic press head, and the guide shaft 9, under the action of the lower telescopic spring 12, passes through the linear bearing 11, and the limit part 22 on the guide shaft 9 supports the rotor positioning plate 10, and the upper part of the guide shaft 9 extends out of the rotor positioning plate 10; first, the inner hole of the first rotor component 24 without magnetic steel is passed through the guide shaft 9 and placed on the rotor positioning plate 10. At this time, the end surface of the guide shaft 9 is higher than the first rotor component 24, and then the second rotor component 25 with magnetic steel is successively sleeved on the guide shaft 9 (the position of the magnetic steel and the notch can be referred to Fig.10 ), the second rotor assembly 25 is close to the end face of the first rotor assembly 24, the third rotor assembly 26 is sleeved on the guide shaft 9, and then the motor shaft 1 is placed in the fourth placement groove 23 of the guide shaft 9, the motor shaft 1 is gently supported by the hand, and the hydraulic press pressing switch is pressed down, and the bell mouth of the pressure column 2 is pressed down to support the end face of the motor shaft 1, and the motor shaft 1 is pressed into the rotor assembly. After pressing down for a distance, the motor shaft 1 is released by hand until the step portion 30 of the motor shaft 1 is pressed onto the upper end face of the third rotor assembly 26, and maintained for about 2S to complete the press fitting; during the press fitting process, the telescopic spring 12 always provides an upward elastic force, so that the motor shaft 1 is not easy to skew during the press fitting process, reducing the press fitting scrap rate of the rotor assembly and the motor shaft 1; after the press fitting is in place, the hydraulic press rising switch is pressed, and the pressure column 2 rises slowly. Due to the force of the bottom telescopic spring 12, the motor shaft-rotor assembly has a tendency to pop up at this time and can be easily taken down.

[0056] The utility model provides a permanent magnet motor skew pole rotor pressing tool, which facilitates the centering operation of the motor shaft into the rotor assembly by means of the arranged telescopic spring and the guide shaft, reduces the pressing process and saves time; by means of the arranged rotor assembly, positioning tool and rotor positioning plate, the long narrow key, the short narrow key of the positioning tool and the positioning key of the rotor positioning plate facilitate the angular deviation and positioning of each rotor assembly, and can press-fit the rotor assembly and the motor shaft at one time, with high assembly efficiency and meeting mass production requirements; by means of the arranged linear bearing, the linear bearing is used to support and guide the guide shaft, so that the entire pressing process has high precision, strong sensitivity and strong practicality.

[0057] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A permanent magnet motor skewed pole rotor pressing tool, the skewed pole rotor comprising a motor shaft (1) and a rotor assembly sleeved on the outer side wall of the motor shaft (1), characterized in that: The pressing tool comprises a coaxially arranged pressing column (2), a guide assembly and a positioning tool (17); The pressure column (2) is detachably fixedly mounted on the pressure head of the hydraulic press, and is used to press the motor shaft (1) downward; the positioning tool (17) is detachably fixedly mounted on the guide assembly, and is used to realize the outer circle positioning of the rotor assembly; The guide assembly is detachably fixedly mounted on the bottom plate of the hydraulic press and is used to achieve inner circle positioning of the rotor assembly, angular deviation of the rotor assembly and positioning and guiding of the motor shaft (1).

2. The permanent magnet motor skew-pole rotor pressing tool according to claim 1, characterized in that: The lower end of the pressure column (2) is provided with a first placement groove (3) for placing the upper end of the motor shaft (1), and the first placement groove (3) is a trumpet-shaped structure.

3. The permanent magnet motor skew-pole rotor pressing tool according to claim 1, characterized in that: The positioning tool (17) comprises a positioning sleeve (4) and a first connecting plate (5) connected to the bottom of the outer side wall of the positioning sleeve (4); the positioning sleeve (4) is a semi-cylindrical structure with openings at both ends; the outer side wall of the rotor assembly is matched with the inner side wall of the positioning sleeve (4); and the first connecting plate (5) is detachably fixedly connected to the guide assembly.

4. The permanent magnet motor skew-pole rotor pressing tool according to claim 3, characterized in that: The inner side wall of the positioning sleeve (4) is provided with a long narrow key (6) and a short narrow key (7) which are matched with the notch of the rotor assembly.

5. The permanent magnet motor skewed pole rotor pressing tool according to claim 1, characterized in that: The guide assembly comprises a flange sleeve (8), a guide shaft (9), a rotor positioning plate (10), a linear bearing (11), a telescopic spring (12), a spring positioning pin (13) and a cover plate (14); the flange sleeve (8) comprises a guide cylinder (15) with upper and lower ends opened and a second connecting plate (16) connected to the top of the outer wall of the guide cylinder (15); a second placement groove (18) is provided at the upper end of the guide cylinder (15); the rotor positioning plate (10) is detachably fixedly installed in the second placement groove (18); and a through hole (19) for the guide shaft (9) to pass through is provided in the middle of the rotor positioning plate (10).

6. The permanent magnet motor skew-pole rotor pressing tool according to claim 5, characterized in that: A third placement groove (20) is provided in the middle of the upper surface of the rotor positioning plate (10), the lower end of the rotor assembly is placed in the third placement groove (20), and a positioning key (21) adapted to the notch of the rotor assembly is provided on the side wall of the third placement groove (20).

7. The permanent magnet motor skew-pole rotor pressing tool according to claim 6, characterized in that: The linear bearing (11) is vertically installed in the guide cylinder (15), and the outer wall of the linear bearing (11) is in contact with the inner wall of the guide cylinder (15).

8. The permanent magnet motor skew-pole rotor pressing tool according to claim 7, characterized in that: The cover plate (14) is detachably fixedly mounted on the bottom of the guide cylinder (15), and the spring positioning pin (13) is detachably fixedly mounted on the middle of the upper surface of the cover plate (14). The telescopic spring (12) is mounted inside the linear bearing (11), and the bottom end of the telescopic spring (12) is sleeved on the outer side wall of the spring positioning pin (13).

9. The permanent magnet motor skew-pole rotor pressing tool according to claim 8, characterized in that: The bottom end of the guide shaft (9) is inserted into the upper end of the telescopic spring (12), and a limiting portion (22) is provided at the bottom of the guide shaft (9). The limiting portion (22) is inserted into the linear bearing (11), and the diameter of the limiting portion (22) is greater than the inner diameter of the through hole (19).

10. The permanent magnet motor skew-pole rotor pressing tool according to claim 9, characterized in that: The upper end of the guide shaft (9) passes through the rotor positioning plate (10) and the rotor assembly, and a fourth placement groove (23) is provided at the upper end of the guide shaft (9), and the lower end of the motor shaft (1) is inserted into the fourth placement groove (23).

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