Motor rotor system and installation method

Abstract

The motor rotor system and installation method belong to the field of elastic fluid rotor technology, including a shaft core, a first bearing, a magnetic steel, and a second bearing that are all coaxially arranged; the magnetic steel is sleeved and fixedly installed on the shaft core; the part of the shaft core exposed to the magnetic steel is an equal-diameter circular shaft with a smooth outer wall. In this technical solution, the optical axis with the same outer diameter of the shaft core only needs one external cylindrical grinding process in processing, which reduces the processing difficulty, reduces the processing time, reduces the scrap rate of parts, and saves costs.

Description

Technical Field

[0001] The invention belongs to the technical field of elastic fluid rotors, and in particular relates to a motor rotor system and an installation method. Background Art

[0002] The centrifugal fan of a vacuum cleaner uses the motor rotor to drive the centrifugal impeller to rotate at high speed, creating negative air pressure in the sealed shell, thereby sucking dust and other debris into the dust bag of the cleaning appliance.

[0003] The traditional motor rotor system has the following shortcomings:

[0004] 1. The rotating shafts on the motor rotors all have shoulders, so high-precision CNC lathes are required to process the rotor shafts. There are many dimensional constraints, and once the processing dimensional error exceeds the tolerance marked on the drawing, the processed shaft will be scrapped, which will increase a series of expenses and increase production costs.

[0005] 2. The magnets of motor rotors on the market are generally press-fitted with an interference fit. Since the magnets are easily broken, the matching accuracy requirements between the magnets and the shaft are more stringent.

[0006] 3. The bearings on the motor rotors on the market are generally pressed onto the shaft shoulders. If the pressure of the pressure equipment is too high or the stroke becomes longer, the bearings will be damaged, increasing the cost of parts and installation costs. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a motor rotor system and an installation method.

[0008] The present invention adopts the following technical solutions.

[0009] The motor rotor system includes a shaft core, a first bearing, a magnetic steel, and a second bearing which are all coaxially arranged; the characteristic is that the magnetic steel is sleeved and fixedly installed on the shaft core; the part of the shaft core exposed to the magnetic steel is an equal-diameter circular shaft with a smooth outer wall.

[0010] The magnetic steel is a cylindrical permanent magnet; the magnetic steel is bonded to the shaft core.

[0011] The entire shaft core is a round shaft with a smooth outer wall and equal diameter.

[0012] The shaft core is provided with an annular groove at the connection with the magnetic steel, and the rest of the shaft core is an equal-diameter circular shaft with a smooth outer wall.

[0013] The upper end circumference of the shaft core is provided with a chamfer.

[0014] The shaft core is sequentially provided with an impeller, a first bearing, a first balancing block, a magnetic steel, a second balancing block, and a second bearing from top to bottom; the impeller, the first bearing, the first balancing block, the second balancing block, and the second bearing are all interference fit with the shaft core; the first balancing block and the second balancing block are respectively arranged on both sides of the magnetic steel.

[0015] The installation method of the motor rotor system comprises the following steps:

[0016] Step 1: Assemble the magnet and shaft:

[0017] An assembly tool is used; the assembly tool is provided with a first guide hole and an axis guide hole arranged coaxially; the first guide hole is located above the axis guide hole; the inner diameter of the first guide hole is the same as the outer diameter of the magnetic steel; the inner diameter of the axis guide hole is the same as the outer diameter of the axis core; the distance from the bottom of the first guide hole to the bottom of the axis guide hole is equal to the distance from the bottom of the magnetic steel to the bottom of the axis core;

[0018] Place the magnet in the first guide hole on the assembly tooling, install the first guide hole and the outer ring of the magnet concentrically, and press the magnet onto the bottom surface of the first guide hole; press the shaft core concentrically into the shaft core guide hole to achieve concentric installation of the shaft core and the magnet, press the shaft core to be flush with the bottom surface of the shaft core guide hole, and locate the position of the magnet on the shaft core;

[0019] At this time, add glue to the glue points of the magnet and the shaft core; after the glue solidifies, push the shaft core and the magnet out from the bottom surface of the assembly tooling to achieve the glue assembly of the magnet;

[0020] Step 2, assemble the balance block and the shaft core:

[0021] An assembly tool is used; the assembly tool is provided with a first guide hole and an axis core guide hole arranged coaxially; the first guide hole is located above the axis core guide hole; the inner diameter of the first guide hole is the same as the outer diameter of the balancing block; the inner diameter of the axis core guide hole is the same as the outer diameter of the axis core; the distance from the bottom of the first guide hole to the bottom of the axis core guide hole is equal to the distance from the bottom of the balancing block to the bottom of the axis core;

[0022] Place the balancing block in the first guide hole on the assembly tool, install the first guide hole and the balancing block concentrically, and press the balancing block onto the bottom surface of the first guide hole; press the shaft core concentrically into the shaft core guide hole to achieve concentric installation of the shaft core and the balancing block, press the shaft core to be flush with the bottom surface of the shaft core guide hole, and locate the position of the magnetic steel on the shaft core;

[0023] At this time, the balance block is attached to the magnetic steel, and the balance block and the shaft core are interference fit;

[0024] Step 3, assemble the bearing and shaft core:

[0025] An assembly tool is used; the assembly tool is provided with a first guide hole and a shaft core guide hole which are coaxially arranged; the first guide hole is located above the shaft core guide hole; the inner diameter of the first guide hole is the same as the outer diameter of the bearing; the inner diameter of the shaft core guide hole is the same as the outer diameter of the shaft core; the distance from the bottom of the first guide hole to the bottom of the shaft core guide hole is equal to the distance from the bottom of the bearing to the bottom of the shaft core;

[0026] Place the bearing in the first guide hole on the assembly tool, install the first guide hole and the bearing concentrically, and press the bearing onto the bottom surface of the first guide hole; press the shaft core concentrically into the shaft core guide hole to achieve concentric installation of the shaft core and the bearing, press the shaft core to be flush with the bottom surface of the shaft core guide hole, and locate the position of the magnetic steel on the shaft core;

[0027] At this point, the bearing and the shaft core have an interference fit;

[0028] Step 4: Assemble the impeller and shaft:

[0029] Fix the shaft core and place the impeller at one end of the shaft core; press the impeller into the shaft core, and make the end face of the shaft core flush with the impeller.

[0030] This technical solution,

[0031] 1. For the optical axis with the same outer diameter of the shaft core, only one external cylindrical grinding process is required in processing, which reduces the processing difficulty, reduces the processing time, reduces the scrap rate of parts, and saves costs.

[0032] 2. The magnet and the shaft core adopt a glue-mounted structure, which is bonded by glue, providing sufficient installation force and facilitating positioning, and there is no need to strictly control the matching tolerance between the magnet and the shaft.

[0033] 3. The present invention uses tooling for assembly, with the outer ring of the magnetic steel being concentric with the shaft, thus solving the problem of eccentricity between the shaft and the magnetic steel during assembly and reducing processing costs.

[0034] 4. The present invention uses a smooth shaft with no shoulder on the shaft. When the pressure equipment is press-fitted, the pressure has no effect on the bearing, so the probability of bearing damage is reduced. Since the bearing is installed using a tool, the bearing positioning is no longer based on the stroke of the pressure equipment, but on the installation size of the tool, so the installation cost of disassembling the bearing back and forth is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the rotor system;

[0036] Figure 2 yes Figure 1 Sectional view of the middle CC plane;

[0037] Figure 3 It is the assembly diagram of the rotor system;

[0038] In the figure: rotor system 400, shaft core 401, annular groove 402, first bearing 403, first balancing block 404, magnetic steel 405, second balancing block 406, second bearing 407, impeller 200, assembly tool 600, first guide hole 601, shaft core guide hole 602. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0040] The rotor system 400 includes a shaft core 401 , a first bearing 403 , a first balancing block 404 , a magnetic steel 405 , a second balancing block 406 , and a second bearing 407 , which are all coaxially arranged.

[0041] The magnetic steel 405 is sleeved and fixedly installed on the shaft core 401; the part of the shaft core 401 exposed to the magnetic steel 405 is a round shaft with a smooth outer wall and equal diameter. Preferably, the magnetic steel 405 and the shaft core 401 are bonded. The magnetic steel 405 is a cylindrical permanent magnet. The magnetic steel 405 is fragile, therefore, it is not suitable to use interference fit between the magnetic steel 405 and the shaft core 401, but it is suitable to use glue binding.

[0042] As a preferred embodiment, the entire shaft core 401 is a round shaft with a smooth outer wall and equal diameter. As another preferred embodiment, the shaft core 401 is provided with an annular groove 402 at the connection with the magnetic steel 405, and the rest of the shaft core 401 is a round shaft with a smooth outer wall and equal diameter. The provision of the annular groove 402 facilitates glue dispensing and strengthens the connection strength between the shaft core 401 and the magnetic steel 405.

[0043] Therefore, the upper and lower ends of the shaft core 401 are both optical axes with the same outer diameter, and only one external cylindrical grinding process is required in processing, which reduces the processing difficulty, reduces the processing time, reduces the scrap rate of parts, and saves costs. At the same time, the magnetic steel of the motor rotor on the market is generally press-fitted with an interference fit. Since the magnetic steel is very easy to break, the matching accuracy requirements for the magnetic steel and the shaft are more stringent. The present invention adopts a glue-fit structure to bond the magnetic steel and the optical axis with glue, which not only provides sufficient installation force, but also facilitates positioning, and does not require strict control of the matching tolerance between the magnetic steel and the shaft.

[0044] The upper circumference of the shaft core 401 is provided with a chamfer. The shaft core 401 is provided with an impeller 200, a first bearing 403, a first balancing block 404, a magnetic steel 405, a second balancing block 406, and a second bearing 407 in sequence from top to bottom. The impeller 200, the first bearing 403, the first balancing block 404, the second balancing block 406, and the second bearing 407 are all interference fit with the shaft core 401.

[0045] The bearings on the motor rotors on the market are generally pressed to the shaft shoulder by press fitting. If the pressure of the press equipment is too large or the stroke is too long, the bearing will be damaged, increasing the cost of parts and installation. The present invention uses the shaft core 401 of the optical shaft, and there is no shaft shoulder on the shaft. When the press equipment is press fitted, the pressure has no effect on the bearing, so the probability of bearing damage is reduced.

[0046] The first balancing block 404 and the second balancing block 406 are respectively arranged on both sides of the magnetic steel 405. Since the magnetic steel 405 is fragile and difficult to calibrate the balance, the first balancing block 404 and the second balancing block 406 are respectively arranged on both sides of the magnetic steel 405 to obtain dynamic balance.

[0047] Generally, no balancing block is added to the motor rotor on the market. Since the magnetic steel is made by mold opening, it is difficult to achieve complete balance on the circumference, and the magnetic steel cannot be processed to remove weight. Therefore, the rotor produces an unbalanced amount under high-speed rotation, causing the rotor to vibrate. The present invention adds a balancing block to the rotor, and the balancing block is easy to remove weight by using brass material. After being tested by a balancing machine, the rotor unbalance is removed on the balancing block, the dynamic balance of the rotor is achieved, and the vibration generated by the high-speed rotation of the rotor is reduced.

[0048] The installation method of the motor rotor system comprises the following steps:

[0049] Step 1, assemble the magnetic steel 405 and the shaft core 401:

[0050] An assembly tool 600 is used; the assembly tool 600 is provided with a first guide hole 601 and an axis guide hole 602 which are coaxially arranged; the first guide hole 601 is located above the axis guide hole 602; the inner diameter of the first guide hole 601 is the same as the outer diameter of the magnetic steel 405; the inner diameter of the axis guide hole 602 is the same as the outer diameter of the axis 401; the distance from the bottom of the first guide hole 601 to the bottom of the axis guide hole 602 is equal to the distance from the bottom of the magnetic steel 405 to the bottom of the axis 401;

[0051] Place the magnet 405 in the first guide hole 601 on the assembly tool 600, install the first guide hole 601 and the outer ring of the magnet 405 concentrically, and press the magnet 405 onto the bottom surface of the first guide hole 601; press the shaft core 401 concentrically into the shaft core guide hole 602 to achieve concentric installation of the shaft core 401 and the magnet 405, press the shaft core 401 to be flush with the bottom surface of the shaft core guide hole 602, and locate the magnet 405 on the shaft core 401;

[0052] At this time, glue is added to the glue spots of the magnetic steel 405 and the shaft core 401; after the glue is cured, the shaft core 401 and the magnetic steel 405 are ejected from the bottom surface of the assembly tool 600 to achieve the glue assembly of the magnetic steel 405;

[0053] Step 2, assemble the balancing block and the shaft core 401:

[0054] An assembly tool 600 is used; the assembly tool 600 is provided with a first guide hole 601 and an axis guide hole 602 which are coaxially arranged; the first guide hole 601 is located above the axis guide hole 602; the inner diameter of the first guide hole 601 is the same as the outer diameter of the balancing block; the inner diameter of the axis guide hole 602 is the same as the outer diameter of the axis 401; the distance from the bottom of the first guide hole 601 to the bottom of the axis guide hole 602 is equal to the distance from the bottom of the balancing block to the bottom of the axis 401;

[0055] Place the balancing block in the first guide hole 601 on the assembly tool 600, install the first guide hole 601 and the balancing block concentrically, and press the balancing block onto the bottom surface of the first guide hole 601; press the shaft core 401 concentrically into the shaft core guide hole 602 to achieve concentric installation of the shaft core 401 and the balancing block, press the shaft core 401 to be flush with the bottom surface of the shaft core guide hole 602, and position the magnetic steel 405 on the shaft core 401;

[0056] At this time, the balancing block is attached to the magnetic steel 405, and the balancing block and the shaft core 401 are interference fit;

[0057] Step 3, assemble the bearing and the shaft core 401:

[0058] An assembly tool 600 is used; the assembly tool 600 is provided with a first guide hole 601 and an axis guide hole 602 which are coaxially arranged; the first guide hole 601 is located above the axis guide hole 602; the inner diameter of the first guide hole 601 is the same as the outer diameter of the bearing; the inner diameter of the axis guide hole 602 is the same as the outer diameter of the axis 401; the distance from the bottom of the first guide hole 601 to the bottom of the axis guide hole 602 is equal to the distance from the bottom of the bearing to the bottom of the axis 401;

[0059] Place the bearing in the first guide hole 601 on the assembly tool 600, install the first guide hole 601 and the bearing concentrically, and press the bearing onto the bottom surface of the first guide hole 601; press the shaft core 401 concentrically into the shaft core guide hole 602 to achieve concentric installation of the shaft core 401 and the bearing, press the shaft core 401 to be flush with the bottom surface of the shaft core guide hole 602, and locate the position of the magnetic steel 405 on the shaft core 401;

[0060] At this time, the bearing and the shaft core 401 are interference fit;

[0061] Step 4, assemble the impeller 200 and the shaft core 401:

[0062] The shaft core 401 is fixed, and the impeller 200 is placed at one end of the shaft core 401 ; the impeller 200 is pressed into the shaft core 401 , and the end surface of the shaft core 401 is flush with the impeller 200 .

[0063] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A method for installing a motor rotor system, characterized in that: The motor rotor system comprises a shaft core (401), a first bearing (403), a magnetic steel (405), and a second bearing (407), all of which are coaxially arranged; The magnetic steel (405) is sleeved and fixedly mounted on the shaft core (401); the portion of the shaft core (401) exposed outside the magnetic steel (405) is a circular shaft with a smooth outer wall and equal diameter; The shaft core (401) is provided with an impeller (200), a first bearing (403), a first balancing block (404), a magnetic steel (405), a second balancing block (406), and a second bearing (407) in sequence from top to bottom; the impeller (200), the first bearing (403), the first balancing block (404), the second balancing block (406), and the second bearing (407) are all interference-fitted with the shaft core (401); the first balancing block (404) and the second balancing block (406) are respectively arranged on both sides of the magnetic steel (405); The method comprises the following steps: Step 1, assemble the magnetic steel (405) and the shaft core (401): An assembly tool (600) is used; the assembly tool (600) is provided with a first guide hole (601) and an axis guide hole (602) which are coaxially arranged; the first guide hole (601) is located above the axis guide hole (602); the inner diameter of the first guide hole (601) is the same as the outer diameter of the magnetic steel (405); the inner diameter of the axis guide hole (602) is the same as the outer diameter of the axis (401); the distance between the bottom of the first guide hole (601) and the bottom of the axis guide hole (602) is equal to the distance between the bottom of the magnetic steel (405) and the bottom of the axis (401); The magnetic steel (405) is placed in the first guide hole (601) on the assembly tool (600), the first guide hole (601) and the outer ring of the magnetic steel (405) are installed concentrically, and the magnetic steel (405) is pressed onto the bottom surface of the first guide hole (601); the shaft core (401) is pressed concentrically into the shaft core guide hole (602) to achieve concentric installation of the shaft core (401) and the magnetic steel (405), and the shaft core (401) is pressed flush with the bottom surface of the shaft core guide hole (602), and the position of the magnetic steel (405) on the shaft core (401) is positioned; At this time, glue is added to the glue spots of the magnetic steel (405) and the shaft core (401); after the glue is cured, the shaft core (401) and the magnetic steel (405) are ejected from the bottom surface of the assembly tool (600) to achieve glue assembly of the magnetic steel (405); Step 2, assemble the balancing weight and the shaft core (401): An assembly tool (600) is used; the assembly tool (600) is provided with a first guide hole (601) and an axis guide hole (602) which are coaxially arranged; the first guide hole (601) is located above the axis guide hole (602); the inner diameter of the first guide hole (601) is the same as the outer diameter of the balancing block; the inner diameter of the axis guide hole (602) is the same as the outer diameter of the axis (401); the distance between the bottom of the first guide hole (601) and the bottom of the axis guide hole (602) is equal to the distance between the bottom of the balancing block and the bottom of the axis (401); The balancing block is placed in the first guide hole (601) on the assembly tool (600), the first guide hole (601) and the balancing block are installed concentrically, and the balancing block is pressed onto the bottom surface of the first guide hole (601); the shaft core (401) is pressed concentrically into the shaft core guide hole (602) to achieve concentric installation of the shaft core (401) and the balancing block, and the shaft core (401) is pressed flush with the bottom surface of the shaft core guide hole (602), and the magnetic steel (405) is positioned on the shaft core (401); At this time, the balancing block is in contact with the magnetic steel (405), and the balancing block and the shaft core (401) are in interference fit; Step 3, assemble the bearing and shaft core (401): An assembly tool (600) is used; the assembly tool (600) is provided with a first guide hole (601) and an axis guide hole (602) which are coaxially arranged; the first guide hole (601) is located above the axis guide hole (602); the inner diameter of the first guide hole (601) is the same as the outer diameter of the bearing; the inner diameter of the axis guide hole (602) is the same as the outer diameter of the axis (401); the distance between the bottom of the first guide hole (601) and the bottom of the axis guide hole (602) is equal to the distance between the bottom of the bearing and the bottom of the axis (401); The bearing is placed in the first guide hole (601) on the assembly tool (600), the first guide hole (601) and the bearing are installed concentrically, and the bearing is pressed onto the bottom surface of the first guide hole (601); the shaft core (401) is pressed concentrically into the shaft core guide hole (602) to achieve concentric installation of the shaft core (401) and the bearing, the shaft core (401) is pressed flush with the bottom surface of the shaft core guide hole (602), and the magnetic steel (405) is positioned on the shaft core (401); At this time, the bearing and the shaft core (401) are interference fit; Step 4, assemble the impeller (200) and the shaft core (401): The shaft core (401) is fixed, and the impeller (200) is placed at one end of the shaft core (401); the impeller (200) is pressed into the shaft core (401), and the end surface of the shaft core (401) is flush with the impeller (200).

2. The method for installing a motor rotor system according to claim 1, characterized in that: The magnetic steel (405) is a cylindrical permanent magnet; the magnetic steel (405) and the shaft core (401) are bonded.

3. The method for installing a motor rotor system according to claim 1, characterized in that: The entire shaft core (401) is a circular shaft of equal diameter with a smooth outer wall.

4. The method for installing a motor rotor system according to claim 1, characterized in that: The shaft core (401) is provided with an annular groove (402) at the connection with the magnetic steel (405), and the rest of the shaft core (401) is a circular shaft with a smooth outer wall and equal diameter.

5. The method for installing a motor rotor system according to claim 1, characterized in that: The upper circumference of the shaft core (401) is provided with a chamfer.

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