A carbon fiber sleeve press-fitting device and press-fitting method for a permanent magnet motor shaft

Abstract

The application discloses a carbon fiber sleeve press-fitting equipment and press-fitting method of a permanent magnet motor shaft, and aims to provide the carbon fiber sleeve press-fitting equipment and press-fitting method of the permanent magnet motor shaft, which can reduce the pressure on the carbon fiber sleeve in the pressing process without reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft, so as to avoid damaging the carbon fiber sleeve in the pressing process and realize fast and low-pressure press-fitting. The carbon fiber sleeve press-fitting equipment of the permanent magnet motor shaft comprises a motor shaft positioning seat for positioning the permanent magnet motor shaft, a cooling device, a carbon fiber sleeve guide head, a press-fitting sleeve and a sleeve lifting mechanism.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor manufacturing, and specifically to a carbon fiber sleeve pressing device and pressing method for permanent magnet motor shafts. Background Technology

[0002] High-speed permanent magnet motor shafts primarily utilize surface-mount permanent magnets. Under high-speed operation, these magnets are subject to immense centrifugal force, which can cause damage. To protect them, a metal or non-metal sheath is added to their surface. The main disadvantages of metal sheaths are their high density, heavy weight, and significant eddy current losses at high frequencies, leading to a rapid increase in motor shaft temperature and ultimately causing the permanent magnets to lose or partially lose their magnetism. In contrast, lightweight carbon fiber sheaths, which are less dense and have no eddy current losses at high frequencies, are more suitable as protective sleeves for high-speed permanent magnet motor shafts.

[0003] Currently, there are two methods for forming carbon fiber sheaths on the surface of high-speed permanent magnet motor shafts. The first method involves winding carbon fiber bundles or filaments around the motor shaft surface and then directly curing them at high temperatures to form the carbon fiber sheath. The second method involves pre-fabricating the carbon fiber sheath and then using tooling and pressure equipment to press it onto the surface of the high-speed permanent magnet motor shaft. In the second method, due to the large interference fit between the carbon fiber sheath and the permanent magnet motor shaft, a higher pressure is required during the pressing process. However, the overall compressive strength of the carbon fiber sheath is relatively low, making it prone to damage during pressing and affecting production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a carbon fiber sleeve pressing device and pressing method for permanent magnet motor shafts that can reduce the pressure on the carbon fiber sleeve during the pressing process without reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft, so as to avoid damage to the carbon fiber sleeve during the pressing process and achieve rapid low-pressure pressing.

[0005] The technical solution of this invention is:

[0006] A carbon fiber sleeve pressing device for a permanent magnet motor shaft includes:

[0007] A motor shaft positioning seat is used to position the permanent magnet motor shaft. The motor shaft positioning seat is provided with an upward-facing spindle positioning hole.

[0008] The cooling device includes a cooling cylinder with openings at both the top and bottom ends and a detachable upper end cover installed at the top of the cooling cylinder. The upper end cover covers the upper opening of the cooling cylinder, and the motor shaft positioning seat extends into the cooling cylinder from the lower opening of the cooling cylinder and covers the lower opening of the cooling cylinder.

[0009] The carbon fiber sleeve guide head is cylindrical and has coaxially distributed mandrel limiting holes inside.

[0010] The press-fit sleeve is located above the motor shaft positioning seat, and the press-fit sleeve is coaxially distributed with the mandrel positioning hole;

[0011] The sheath lifting mechanism drives the press-fit sheath to move up and down.

[0012] The specific use of the carbon fiber sleeve press-fitting equipment for the permanent magnet motor shaft in this solution is as follows.

[0013] Install the carbon fiber sleeve guide head on the rear end of the mandrel of the permanent magnet motor shaft; position the permanent magnet motor shaft on the motor shaft positioning seat. At this time, the permanent magnet motor shaft is located inside the cooling cylinder.

[0014] Next, the permanent magnet motor shaft inside the cooling cylinder is cooled down by a cooling device to a set temperature. In this way, the outer diameter of the permanent magnet motor shaft is reduced by cooling it down, thereby reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft during the subsequent pressing process. This reduces the pressure required to press the carbon fiber sleeve onto the permanent magnet motor shaft, thus preventing damage to the carbon fiber sleeve during the pressing process and achieving rapid, low-pressure pressing.

[0015] Next, the carbon fiber sleeve is fitted onto the carbon fiber sleeve guide head; then, the sleeve lifting mechanism drives the pressing sleeve to descend, pressing the carbon fiber sleeve onto the permanent magnet motor shaft. After the carbon fiber sleeve is pressed, the carbon fiber sleeve and the permanent magnet motor shaft are placed at room temperature to allow the permanent magnet motor shaft to return to room temperature, thereby increasing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft. Therefore, the carbon fiber sleeve pressed by the carbon fiber sleeve pressing equipment of this solution can reduce the pressure on the carbon fiber sleeve during the pressing process without reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft, thus avoiding damage to the carbon fiber sleeve during the pressing process and achieving rapid, low-pressure pressing.

[0016] Preferably, a pressure sensor is also included, which is located at the bottom of the motor shaft positioning seat. Thus, during the carbon fiber sleeve pressing process, the pressure sensor can monitor in real time the pressure exerted by the sleeve lifting mechanism on the carbon fiber sleeve and the motor shaft positioning seat. When the pressure exceeds a set value, the sleeve lifting mechanism stops pressing down to prevent damage to the carbon fiber sleeve during the pressing process.

[0017] Preferably, a displacement sensor is also included to measure the lifting and lowering stroke of the press-fit sleeve. Thus, during the pressing process of the carbon fiber sleeve, the displacement sensor can monitor the pressing stroke of the carbon fiber sleeve in real time, enabling the sleeve to be pressed into place in one go; at the same time, it avoids the problem of excessive pressing stroke of the carbon fiber sleeve, which could cause damage to the carbon fiber sleeve.

[0018] Preferably, the upper edge of the carbon fiber sleeve guide head is chamfered. This facilitates the fitting of the carbon fiber sleeve onto the carbon fiber sleeve guide head.

[0019] Preferably, the cooling device also includes two translation cylinders, one on the left and one on the right. The cooling cylinder is composed of two semi-cylindrical bodies joined together, with each translation cylinder corresponding to one of the semi-cylindrical bodies. The translation cylinder drives the corresponding semi-cylindrical body to translate, so that the two semi-cylindrical bodies can be separated or joined together to form the cooling cylinder. In this way, before positioning the permanent magnet motor shaft on the motor shaft positioning seat, the two semi-cylindrical bodies can be separated by the translation cylinders to facilitate the positioning of the permanent magnet motor shaft on the motor shaft positioning seat. After the permanent magnet motor shaft is positioned on the motor shaft positioning seat, the two semi-cylindrical bodies can be joined together by the translation cylinders to form the cooling cylinder, so that the cooling device can effectively cool and reduce the temperature of the permanent magnet motor shaft inside the cooling cylinder.

[0020] Preferably, the cooling device is a liquid nitrogen cooling device, which also includes a liquid nitrogen inlet pipe and a return pipe. A liquid nitrogen cooling channel is provided inside the semi-cylindrical body. The liquid nitrogen inlet pipe is connected to the inlet of the liquid nitrogen cooling channel, and the return pipe is connected to the outlet of the liquid nitrogen cooling channel. The liquid nitrogen cooling device can efficiently cool and lower the temperature of the permanent magnet motor shaft to a sufficiently low set temperature.

[0021] Preferably, the motor shaft positioning seat has an upward-facing motor shaft positioning groove, and the upper end of the spindle positioning hole is connected to the motor shaft positioning groove. This allows for a more stable positioning of the permanent magnet motor shaft on the motor shaft positioning seat.

[0022] Preferably, the inner wall of the press-fit sleeve is provided with a press-fit stepped surface that mates with the carbon fiber sleeve. During the press-fitting process of the carbon fiber sleeve, the carbon fiber sleeve is inserted into the press-fit sleeve, and the press-fit stepped surface presses against the upper end of the carbon fiber sleeve to achieve compression of the carbon fiber sleeve. This ensures the stability of the carbon fiber sleeve during the pressing process.

[0023] A carbon fiber sleeve pressing method using a permanent magnet motor shaft carbon fiber sleeve pressing device includes the following steps:

[0024] First, install the carbon fiber sleeve guide head, insert the rear end of the permanent magnet motor shaft mandrel into the mandrel limiting hole of the carbon fiber sleeve guide head, and support the lower end of the carbon fiber sleeve guide head on the mandrel.

[0025] The permanent magnet motor shaft is positioned on the motor shaft positioning seat, and the front end of the permanent magnet motor shaft spindle is inserted into the spindle positioning hole so that the permanent magnet motor shaft is positioned and supported on the motor shaft positioning seat.

[0026] Second, by sealing the upper opening of the cooling cylinder with the upper end cover, the permanent magnet motor shaft is located inside the sealed cooling cylinder;

[0027] Third, the cooling device operates to cool and lower the temperature of the permanent magnet motor shaft inside the cooling cylinder to a set temperature t. In this way, by cooling and lowering the temperature of the permanent magnet motor shaft, the outer diameter of the permanent magnet motor shaft is reduced, thereby reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft during the subsequent pressing process of the carbon fiber sleeve. This reduces the pressure required to press the carbon fiber sleeve onto the permanent magnet motor shaft, thus avoiding damage to the carbon fiber sleeve during the pressing process and achieving rapid, low-pressure pressing.

[0028] Fourth, remove the top cover; then, put the carbon fiber sleeve onto the carbon fiber sleeve guide head;

[0029] Fifth, the sheath lifting mechanism drives the pressing sheath to descend, pressing the carbon fiber sleeve onto the permanent magnet motor shaft. After the carbon fiber sleeve is pressed, the carbon fiber sleeve and the permanent magnet motor shaft are placed at room temperature to allow the permanent magnet motor shaft to return to room temperature, thereby increasing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft. Therefore, the carbon fiber sleeve pressed using this method for the permanent magnet motor shaft can reduce the pressure on the carbon fiber sleeve during the pressing process without reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft, thus avoiding damage to the carbon fiber sleeve during the pressing process and achieving rapid, low-pressure pressing.

[0030] The beneficial effects of this invention are: it can reduce the pressure on the carbon fiber sheath during the pressing process without reducing the interference fit between the carbon fiber sheath and the permanent magnet motor shaft, so as to avoid damage to the carbon fiber sheath during the pressing process and achieve rapid low-pressure pressing. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a carbon fiber sleeve pressing device for a permanent magnet motor shaft according to the present invention in actual operation.

[0032] Figure 2 This is a schematic diagram of the structure of the permanent magnet motor shaft and the carbon fiber sleeve guide head of the present invention.

[0033] In the picture:

[0034] Motor shaft positioning seat 1, spindle positioning hole 1.1, motor shaft positioning groove 1.2, clearance groove 1.3;

[0035] Cooling device 2, cooling cylinder 2.1, semi-cylindrical body 2.2, translation cylinder 2.3;

[0036] Carbon fiber sleeve guide head 3, mandrel limiting hole 3.1, chamfer 3.2, clearance opening 3.3;

[0037] Press-fitted sheath 4, press-fitted stepped surface 4.1;

[0038] Sheath lifting mechanism 5;

[0039] Pressure sensor 6;

[0040] Displacement sensor 7;

[0041] Carbon fiber sleeve 8;

[0042] Permanent magnet motor shaft 9, spindle 9.1, permanent magnet 9.2, front limit step 9.3, rear limit step 9.4;

[0043] Lifting platform 10;

[0044] Monitor 11. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0046] Specific Implementation Example 1, such as Figure 1 , Figure 2 As shown, a carbon fiber sleeve pressing device for a permanent magnet motor shaft includes a motor shaft positioning seat 1, a cooling device 2, a carbon fiber sleeve guide head 3, a pressing sleeve 4, and a sleeve lifting mechanism 5. The motor shaft positioning seat 1 is used to position the permanent magnet motor shaft (the permanent magnet motor shaft 9 includes a mandrel 9.1 and a surface-mounted permanent magnet 9.2 fixed to the outer circumference of the mandrel; the mandrel has a front limiting step 9.3 and a rear limiting step 9.4). The motor shaft positioning seat has an upward-opening mandrel positioning hole 1.1. The mandrel positioning holes are vertically distributed and used to mate with the mandrel of the permanent magnet motor shaft.

[0047] The carbon fiber sleeve guide head 3 is cylindrical. The carbon fiber sleeve can be fitted onto the carbon fiber sleeve guide head. The carbon fiber sleeve guide head has coaxially distributed mandrel limiting holes 3.1 inside, meaning the mandrel limiting holes are coaxially distributed with the carbon fiber sleeve guide head. The mandrel limiting holes mate with the mandrel of the permanent magnet motor shaft, so that the carbon fiber sleeve guide head is coaxially positioned on the permanent magnet motor shaft.

[0048] The press-fit sleeve 4 is located above the motor shaft positioning seat. The press-fit sleeve is vertically distributed. The press-fit sleeve is coaxially distributed with the mandrel positioning hole. In this embodiment, the press-fit sleeve is installed on the lifting platform 10.

[0049] The sheath lifting mechanism 5 drives the pressing sheath 4 to move up and down. The sheath lifting mechanism is a vertically distributed cylinder, hydraulic cylinder, electric cylinder, or other lifting mechanism. In this embodiment, the sheath lifting mechanism drives the lifting platform and the pressing sheath to move up and down together.

[0050] The cooling device 2 includes a cooling cylinder 2.1 with openings at both the top and bottom, and a detachable upper end cover (not shown in the figure) located at the top of the cooling cylinder. The upper end cover seals the upper opening of the cooling cylinder. The motor shaft positioning seat extends into the cooling cylinder through the lower opening and seals the lower opening of the cooling cylinder.

[0051] The specific use of the carbon fiber sleeve press-fitting equipment for the permanent magnet motor shaft in this embodiment is as follows.

[0052] like Figure 1 , Figure 2 As shown, the carbon fiber sleeve guide head 3 is installed on the rear end of the mandrel of the permanent magnet motor shaft. Specifically, the rear end of the mandrel 9.1 of the permanent magnet motor shaft is inserted into the mandrel limiting hole 3.1 of the carbon fiber sleeve guide head, and the lower end of the carbon fiber sleeve guide head is supported on the rear limiting step 9.4 of the mandrel.

[0053] The permanent magnet motor shaft is positioned on the motor shaft positioning seat. Specifically, the front end of the mandrel 9.1 of the permanent magnet motor shaft is inserted into the mandrel positioning hole 1.1, and the front limiting step 9.3 of the mandrel is supported on the motor shaft positioning seat so that the permanent magnet motor shaft is positioned and supported on the motor shaft positioning seat; at this time, the permanent magnet motor shaft is located inside the cooling cylinder.

[0054] Next, the upper opening of the cooling cylinder is sealed by the upper end cover, so that the permanent magnet motor shaft is located in the sealed cooling cylinder. Then, the permanent magnet motor shaft in the cooling cylinder is cooled down by the cooling device until it reaches the set temperature. In this way, the outer diameter of the permanent magnet motor shaft is reduced by cooling down the permanent magnet motor shaft, thereby reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft in the subsequent carbon fiber sleeve pressing process. This reduces the pressure required to press the carbon fiber sleeve onto the permanent magnet motor shaft, so as to avoid damage to the carbon fiber sleeve during the pressing process and achieve rapid low-pressure pressing.

[0055] Next, the carbon fiber sleeve 8 is fitted onto the carbon fiber sleeve guide head; then, the sleeve lifting mechanism drives the pressing sleeve to descend, pressing the carbon fiber sleeve onto the permanent magnet motor shaft. After the carbon fiber sleeve is pressed, the carbon fiber sleeve and the permanent magnet motor shaft are placed at room temperature to allow the permanent magnet motor shaft to return to room temperature, thereby increasing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft. Therefore, the carbon fiber sleeve pressed by the carbon fiber sleeve pressing equipment of this scheme can reduce the pressure on the carbon fiber sleeve during the pressing process without reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft, thus avoiding damage to the carbon fiber sleeve during the pressing process and achieving rapid low-pressure pressing.

[0056] Specifically, such as Figure 1 As shown, a carbon fiber sleeve pressing device for a permanent magnet motor shaft also includes a pressure sensor 6. The pressure sensor is located at the bottom of the motor shaft positioning seat and is used to detect the vertical pressure exerted on the motor shaft positioning seat. During the carbon fiber sleeve pressing process, the pressure sensor can monitor in real time the pressure exerted by the sleeve lifting mechanism on the carbon fiber sleeve and the motor shaft positioning seat. When the pressure exceeds a set value, the sleeve lifting mechanism stops pressing to prevent damage to the carbon fiber sleeve during the pressing process.

[0057] like Figure 1 As shown, a carbon fiber sleeve pressing device for a permanent magnet motor shaft also includes a displacement sensor 7 and a display 11. Both the pressure sensor and the displacement sensor are connected to the display, which shows the pressure value monitored by the pressure sensor and the lifting stroke of the pressing sleeve monitored by the displacement sensor. The displacement sensor is used to measure the lifting stroke of the pressing sleeve. In this embodiment, the displacement sensor is mounted on a lifting platform. Thus, during the pressing process of the carbon fiber sleeve, the displacement sensor can monitor the downward pressing stroke of the carbon fiber sleeve in real time, achieving one-time pressing of the sleeve into place; at the same time, it avoids the problem of excessive downward pressing stroke of the carbon fiber sleeve, which could cause damage to the carbon fiber sleeve.

[0058] Furthermore, such as Figure 1 As shown, the motor shaft positioning seat has an upward-opening motor shaft positioning groove 1.2, and a clearance groove 1.3 on the bottom surface of the motor shaft positioning groove. The upper end of the spindle positioning hole is connected to the motor shaft positioning groove; specifically, the upper end of the spindle positioning hole is connected to the bottom surface of the clearance groove. Thus, when the permanent magnet motor shaft is positioned on the motor shaft positioning seat, the front end of the permanent magnet motor shaft is inserted into the spindle positioning hole, and the front limiting step of the spindle limits and supports it within the motor shaft positioning groove, thereby positioning and supporting the permanent magnet motor shaft on the motor shaft positioning seat. This allows for a more stable positioning of the permanent magnet motor shaft on the motor shaft positioning seat.

[0059] Furthermore, such as Figure 1As shown, the inner wall of the press-fit sleeve 4 is provided with a press-fit stepped surface 4.1 that mates with the carbon fiber sleeve. The press-fit stepped surfaces are horizontally distributed. The inner diameter of the press-fit sleeve is larger than the outer diameter of the carbon fiber sleeve. During the press-fitting process of the carbon fiber sleeve, the carbon fiber sleeve is inserted into the press-fit sleeve, and the upper end of the carbon fiber sleeve is pressed by the press-fit stepped surfaces to achieve the pressing of the carbon fiber sleeve. In this way, the stability of the carbon fiber sleeve during the pressing process can be guaranteed.

[0060] Furthermore, such as Figure 2 As shown, the upper edge of the carbon fiber sleeve guide head has a chamfer 3.2. This facilitates the fitting of the carbon fiber sleeve onto the carbon fiber sleeve guide head. The lower end face of the carbon fiber sleeve guide head also has a clearance opening 3.3, which is connected to the mandrel limiting hole.

[0061] Furthermore, such as Figure 1 As shown, the cooling device also includes two translation cylinders 2.3. The cooling cylinder is composed of two semi-cylindrical bodies 2.2 joined together. Each translation cylinder corresponds to one of the semi-cylindrical bodies. The translation cylinder drives the corresponding semi-cylindrical body to translate, causing the two semi-cylindrical bodies to separate or join together to form the cooling cylinder. Thus, before positioning the permanent magnet motor shaft on the motor shaft positioning seat, the two semi-cylindrical bodies can be separated by the translation cylinders to facilitate positioning the permanent magnet motor shaft on the motor shaft positioning seat; after the permanent magnet motor shaft is positioned on the motor shaft positioning seat, the two semi-cylindrical bodies are joined together by the translation cylinders to form the cooling cylinder, enabling the cooling device to effectively cool the permanent magnet motor shaft inside the cooling cylinder.

[0062] In this embodiment, the cooling device is a liquid nitrogen cooling device. The cooling device also includes a liquid nitrogen inlet pipe and a return pipe. A liquid nitrogen cooling channel is provided inside the semi-cylindrical body. The liquid nitrogen inlet pipe is connected to the inlet of the liquid nitrogen cooling channel, and the return pipe is connected to the outlet of the liquid nitrogen cooling channel. The liquid nitrogen cooling device can efficiently cool and lower the temperature of the permanent magnet motor shaft, reducing it to a sufficiently low set temperature.

[0063] Specific Embodiment Two: A method for pressing a carbon fiber sleeve onto a permanent magnet motor shaft. This method utilizes a carbon fiber sleeve pressing device for permanent magnet motor shafts. The specific structure of the carbon fiber sleeve pressing device for permanent magnet motor shafts is described in Specific Embodiment One.

[0064] A method for press-fitting a carbon fiber sleeve onto a permanent magnet motor shaft includes the following steps:

[0065] First, install the carbon fiber sleeve guide head, insert the rear end of the permanent magnet motor shaft mandrel into the mandrel limiting hole of the carbon fiber sleeve guide head, and support the lower end of the carbon fiber sleeve guide head on the mandrel; specifically, insert the rear end of the permanent magnet motor shaft mandrel into the mandrel limiting hole of the carbon fiber sleeve guide head, and support the lower end of the carbon fiber sleeve guide head on the rear limiting step of the mandrel.

[0066] The permanent magnet motor shaft is positioned on the motor shaft positioning seat, and the front end of the permanent magnet motor shaft mandrel is inserted into the mandrel positioning hole so that the permanent magnet motor shaft is positioned and supported on the motor shaft positioning seat. Specifically, firstly, the two semi-cylinders are separated from each other by a translation cylinder to facilitate the positioning of the permanent magnet motor shaft on the motor shaft positioning seat. Next, the front end of the permanent magnet motor shaft mandrel is inserted into the mandrel positioning hole, and the front limit step of the mandrel is supported on the motor shaft positioning seat so that the permanent magnet motor shaft is positioned and supported on the motor shaft positioning seat (at this time, the permanent magnet motor shaft is vertically distributed). Then, the two semi-cylinders are joined together by a translation cylinder to form a cooling cylinder so that the permanent magnet motor shaft is located inside the cooling cylinder.

[0067] Second, the upper opening of the cooling cylinder is sealed by the upper end cover, so that the permanent magnet motor shaft is located inside the sealed cooling cylinder.

[0068] Third, the cooling device operates to cool the permanent magnet motor shaft inside the cooling cylinder to a set temperature t. In this embodiment, the set temperature t is between -80 and -120 degrees Celsius. By cooling the permanent magnet motor shaft, its outer diameter is reduced, thereby reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft during the subsequent pressing process. This reduces the pressure required to press the carbon fiber sleeve onto the permanent magnet motor shaft, preventing damage to the carbon fiber sleeve during the pressing process.

[0069] Fourth, remove the top cover; then, put the carbon fiber sleeve onto the carbon fiber sleeve guide head.

[0070] Fifth, the sheath lifting mechanism drives the pressing sheath to descend, pressing the carbon fiber sleeve onto the permanent magnet motor shaft. During the pressing process, a pressure sensor monitors in real time the pressure exerted by the sheath lifting mechanism on the carbon fiber sheath and the motor shaft positioning seat. When this pressure exceeds a set value, the sheath lifting mechanism stops pressing to prevent damage to the carbon fiber sheath during the pressing process. Simultaneously, a displacement sensor monitors the pressing stroke of the carbon fiber sheath in real time, achieving one-time pressing of the sheath into place.

[0071] After the carbon fiber sleeve is press-fitted, the carbon fiber sleeve and the permanent magnet motor shaft are placed at room temperature to allow the permanent magnet motor shaft to return to room temperature, thereby increasing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft. Therefore, the carbon fiber sleeve pressed using this method for the permanent magnet motor shaft can reduce the pressure on the carbon fiber sleeve during the pressing process without reducing the interference fit between the carbon fiber sleeve and the permanent magnet motor shaft, thus avoiding damage to the carbon fiber sleeve during pressing and achieving rapid, low-pressure press-fitting.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A carbon fiber sleeve pressing device for a permanent magnet motor shaft, characterized in that, include: A motor shaft positioning seat is used to position the permanent magnet motor shaft. The motor shaft positioning seat is provided with an upward-facing spindle positioning hole. The cooling device includes two left and right translation cylinders, a cooling cylinder with openings at both the top and bottom, and a detachable upper end cover set at the top of the cooling cylinder. The upper end cover covers the upper opening of the cooling cylinder. The motor shaft positioning seat extends into the cooling cylinder from the lower opening and covers the lower opening of the cooling cylinder. The cooling cylinder is composed of two semi-cylindrical bodies on the left and right. The translation cylinders correspond one-to-one with the semi-cylindrical bodies. The translation cylinders drive the corresponding semi-cylindrical bodies to translate so that the two semi-cylindrical bodies can separate or be assembled to form the cooling cylinder. The carbon fiber sleeve guide head is cylindrical and has coaxially distributed mandrel limiting holes inside. The press-fit sleeve is located above the motor shaft positioning seat, and the press-fit sleeve is coaxially distributed with the mandrel positioning hole; The sheath lifting mechanism drives the press-fit sheath to move up and down.

2. The carbon fiber sleeve pressing equipment for a permanent magnet motor shaft according to claim 1, characterized in that, It also includes a pressure sensor, which is located at the bottom of the motor shaft positioning seat.

3. The carbon fiber sleeve pressing equipment for a permanent magnet motor shaft according to claim 1, characterized in that, It also includes a displacement sensor, which is used to measure the lifting and lowering stroke of the press-fit sleeve.

4. A carbon fiber sleeve pressing device for a permanent magnet motor shaft according to claim 1, 2, or 3, characterized in that, The upper edge of the carbon fiber sleeve guide head is chamfered.

5. A carbon fiber sleeve pressing device for a permanent magnet motor shaft according to claim 1, 2, or 3, characterized in that, The cooling device is a liquid nitrogen cooling device, which also includes a liquid nitrogen inlet pipe and a return pipe. The semi-cylindrical body is provided with a liquid nitrogen cooling channel. The liquid nitrogen inlet pipe is connected to the inlet of the liquid nitrogen cooling channel, and the return pipe is connected to the outlet of the liquid nitrogen cooling channel.

6. A carbon fiber sleeve pressing device for a permanent magnet motor shaft according to claim 1, 2, or 3, characterized in that, The motor shaft positioning seat is provided with an upward-facing motor shaft positioning groove, and the upper end of the spindle positioning hole is connected to the motor shaft positioning groove.

7. A carbon fiber sleeve pressing device for a permanent magnet motor shaft according to claim 1, 2, or 3, characterized in that, The inner wall of the press-fit sleeve is provided with a press-fit stepped surface that mates with the carbon fiber sleeve.

8. A method for pressing carbon fiber sleeves using a carbon fiber sleeve pressing device for permanent magnet motor shafts according to any one of claims 1-7, characterized in that, The steps are as follows: First, install the carbon fiber sleeve guide head, insert the rear end of the permanent magnet motor shaft mandrel into the mandrel limiting hole of the carbon fiber sleeve guide head, and support the lower end of the carbon fiber sleeve guide head on the mandrel. The permanent magnet motor shaft is positioned on the motor shaft positioning seat, and the front end of the permanent magnet motor shaft spindle is inserted into the spindle positioning hole so that the permanent magnet motor shaft is positioned and supported on the motor shaft positioning seat. Second, by sealing the upper opening of the cooling cylinder with the upper end cover, the permanent magnet motor shaft is located inside the sealed cooling cylinder; Third, the cooling device works to cool and lower the temperature of the permanent magnet motor shaft inside the cooling cylinder, so that the permanent magnet motor shaft is cooled and lowered to the set temperature t. Fourth, remove the top cover; then, put the carbon fiber sleeve onto the carbon fiber sleeve guide head; Fifth, the sheath lifting mechanism drives the pressing sheath to descend, pressing the carbon fiber sleeve onto the permanent magnet motor shaft.

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