Motor rotor device

Abstract

The utility model relates to a motor rotor device which is characterized in that the motor rotor device comprises a core shaft, magnetic steel and a protective sleeve are sequentially sleeved outside the core shaft, and a left half shaft and a right half shaft are respectively arranged at two ends of the core shaft; two ends of the mandrel are respectively provided with external threads with opposite spiral directions, the left half shaft and the right half shaft are respectively provided with internal screw holes matched with the external threads, and the left half shaft and the right half shaft are opposite in spiral direction; a thrust disc structure is arranged at one end of the left half shaft, the left half shaft and the thrust disc structure are of an integrated structure, the flatness of the thrust disc structure is smaller than 0.005 mm, a thrust disc connecting column extending outwards is arranged at one end of the left half shaft, the thrust disc structure is fixed to the thrust disc connecting column, and the left half shaft and the right half shaft are of a hollow structure and are each provided with a center hole. The whole rotor device is integrated, the overall precision size is guaranteed, meanwhile, the weight is reduced, through threaded connection of the left half shaft and the right half shaft in different directions, the rotor device keeps extremely high stability and balance in the running process, and the ultrahigh rotating speed of 180000 revolutions per minute is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor equipment, specifically to a motor rotor device, and particularly to an ultra-high speed motor rotor device. Background Art

[0002] At present, with the improvement of living quality, people's requirements for product performance are getting higher and higher, and thus the requirements for product design and manufacturing will also become higher and higher. For example, the speed of traditional motors is about 10,000 revolutions per minute, and the speed of high-end motors basically does not exceed 50,000 revolutions per minute.

[0003] However, with the rapid development of industries such as industry, automobiles, and aviation, the demand for high-speed motors is continuously increasing. Especially in the fields of new energy vehicles and the thermal management system of energy storage devices, the market scale of high-speed motors will continue to expand. Due to reasons such as structure and performance, such as stability, integration level, and safety during rotation, traditional high-speed electronic rotors cannot meet the market application requirements. Therefore, there is an urgent need in the market for a motor rotor device applicable to ultra-high speed motors. Summary of the Invention

[0004] The purpose of the utility model is to provide an improved motor rotor device. Through the improvement of the structure, the weight of the rotor is effectively reduced, enabling the rotor speed to reach 180,000 revolutions per minute, greatly improving the performance and use value of the rotor.

[0005] To achieve the above purpose, the technical solution of the utility model is: a motor rotor device, characterized in that: the rotor device includes a core shaft, a magnetic steel and a protective sleeve are sequentially sleeved outside the core shaft, and left and right half shafts are respectively provided at both ends of the core shaft; external threads with opposite spiral directions are respectively provided at both ends of the core shaft, internal screw holes matching the external threads are respectively provided on the left and right half shafts, and the rotation directions of the left and right half shafts are opposite; a thrust disc structure is provided at one end of the left half shaft, the left half shaft and the thrust disc structure are an integrated structure, the flatness of the thrust disc structure is less than 0.005 mm, a thrust disc connection column extending outward is provided at one end of the left half shaft, the thrust disc structure is fixed on the thrust disc connection column, and a gap of 3 - 6 cm is formed between the thrust disc structure and the left half shaft through the thrust disc connection column; the left and right half shafts are hollow structures and are respectively provided with central holes; a left half shaft connection part is provided at the connection end of the left half shaft and the core shaft, two left-side installation positioning reference surfaces are provided on the left half shaft connection part, a right half shaft connection part is provided at the connection end of the right half shaft and the core shaft, and one right-side installation positioning reference surface is provided on the right half shaft connection part.

[0006] Preferably, a clearance fit is adopted between the core shaft and the magnetic steel, and the clearance size is 0.02 - 0.04 mm; an interference fit is adopted between the magnetic steel and the protective sleeve, and the interference amount is 0.12 - 0.14 mm.

[0007] Furthermore, the aperture of the central hole is 1 / 5 - 1 / 2 of the diameters of the left and right half shafts.

[0008] Furthermore, one end of the mandrel is provided with a protruding step for limiting the magnet, and an external thread on the left side of the mandrel is provided on the step; the other end of the mandrel is provided with a connecting column extending outwards, an external thread on the right side of the mandrel is provided on the connecting column, and the diameter of the connecting column is smaller than that of the mandrel.

[0009] Furthermore, the connection end of the left half shaft and the mandrel is provided with a left half shaft connection part, and a left internal thread matching the step is provided in the central hole of the left half shaft; the connection end of the right half shaft and the mandrel is provided with a right half shaft connection part, and a right internal thread matching the connecting column is provided in the central hole of the right half shaft; the diameters of the left and right half shaft connection parts are less than or equal to the diameter of the magnet.

[0010] Even further, one end of the left half shaft is provided with a thrust disc structure, the left half shaft and the thrust disc structure are an integral structure, and the flatness of the thrust disc structure is less than 0.005 mm. The left and right half shafts and the protective sleeve are connected by welding, and the welding penetration depth is greater than 2 mm.

[0011] Compared with the prior art, the technical solution of the present utility model includes not only the improvement of the overall technical solution, but also many improvements in details. Specifically, it has the following beneficial effects:

[0012] 1. In the improvement solution of the present utility model, the rotor device includes a mandrel, a magnet and a protective sleeve are sequentially sleeved outside the mandrel, and the left and right half shafts are respectively provided at both ends of the mandrel; the left and right half shafts are hollow structures and are respectively provided with central holes, which can reduce the weight of the product, effectively improve the rotational speed of the rotor and reduce the starting time. At the same time, the split design can reduce the production cost. At the same time, the protective sleeve and the bearing position are integrally formed, which can ensure the stability of the bearing positions at both ends under high rotational speed and improve the operation reliability;

[0013] 2. In the technical solution of the present utility model, external threads with opposite spiral directions are respectively provided at both ends of the mandrel, the left and right half shafts are respectively provided with internal screw holes matching the external threads, and the left and right half shafts have opposite helix directions, which ensure that the rotor becomes tighter and tighter during operation, with good integration effect, and ensure the operation reliability and stability;

[0014] 3. In the solution of the present utility model, one end of the left half shaft is provided with a thrust disc structure, the left half shaft and the thrust disc structure are an integral structure, forming an integrated high-precision connection between the motor shaft and the thrust disc, reducing the instability of the gap between the thrust disc side and the housing while ensuring the overall strength of the rotor, so as to achieve the purpose of high rotational speed of the rotor

[0015] 4. In the structure of the present utility model, one end of the mandrel is provided with a protruding step for limiting the magnetic steel, and an external thread on the left side of the mandrel is provided on the step; the other end of the mandrel is provided with a connecting column extending outward, and an external thread on the right side of the mandrel is provided on the connecting column; this facilitates reducing the positioning gap during subsequent assembly of the left and right half shafts, thereby meeting the dynamic balance requirements.

[0016] 5. The structure of the present utility model is simple, easy to assemble, has high precision in the bearing position and the clearance of the thrust disc, enables the rotor to reach an ultra-high speed of 180,000 revolutions per minute, has great application prospects, and is convenient for popularization and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the dispersed structure of the present utility model.

[0018] Figure 2 It is an assembly schematic diagram of the mandrel of the present utility model with the left and right half shafts.

[0019] Figure 3 is Figure 2 the sectional view taken along the A-A direction of

[0020] Reference numerals:

[0021] 1 Left half shaft, 2 Protective sleeve, 3 Right half shaft, 4 Mandrel, 5 Magnetic steel, 6 Central hole;

[0022] 11 Thrust disc structure, 12 Thrust disc connecting column, 13 Left side installation and positioning reference surface;

[0023] 31 Right side installation and positioning reference surface;

[0024] 41 External thread, 42 Step, 43 Connecting column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] The present utility model provides a motor rotor device, specifically refer to Figure 1, characterized in that: the rotor device includes a mandrel 4, an outer magnet 5 and a protective sleeve 2 are sequentially sleeved outside the mandrel 4, and left and right half shafts 1 and 3 are respectively arranged at both ends of the mandrel 4; external threads with opposite spiral directions are respectively arranged at both ends of the mandrel, and internal screw holes matching the external threads are respectively arranged on the left and right half shafts, and the rotation directions of the left and right half shafts are opposite; a thrust plate structure is arranged at one end of the left half shaft, and the left half shaft and the thrust plate structure are of an integrated structure. The flatness of the thrust plate structure 11 is less than 0.005 mm. A thrust plate connection column 12 extending outwards is arranged at one end of the left half shaft, and the thrust plate structure is fixed on the thrust plate connection column 12. Through the thrust plate connection column, a gap of 3 - 6 cm is formed between the thrust plate structure and the left half shaft. The left and right half shafts are of a hollow structure and respectively provided with central holes 6, and the depth of the central holes accounts for 2 / 3 - 4 / 5 of the height of the left and right half shafts. A left half shaft connection part is arranged at the connection end of the left half shaft and the mandrel. Two left-side installation positioning reference surfaces 13 are arranged on the left half shaft connection part, which are respectively used for positioning the magnet and the protective sleeve. A right half shaft connection part is arranged at the connection end of the right half shaft and the mandrel. A right-side installation positioning reference surface 31 is arranged on the right half shaft connection part, which is used for positioning the protective sleeve, making the assembly more accurate and ensuring the effective progress of subsequent welding connection at the same time.

[0027] Furthermore, a raised step is arranged at one end of the mandrel for limiting the magnet, and external threads on the left side of the mandrel are arranged on the step; a connection column extending outwards is arranged at the other end of the mandrel, and external threads on the right side of the mandrel are arranged on the connection column, and the diameter of the connection column is smaller than that of the mandrel. A left threaded hole matching the step is arranged in the central hole of the left half shaft; a right threaded hole matching the connection column is arranged in the central hole of the right half shaft; the diameters of the left and right half shaft connection parts are less than or equal to the diameter of the magnet.

[0028] During use, a clearance fit is between the mandrel 4 and the magnet 5, an interference fit is between the magnet 5 and the protective sleeve 2, and both ends of the protective sleeve 2 are respectively welded to the left and right half shafts 1 and 3, integrating the entire rotor device into one body, ensuring the overall precision dimensions, and enabling the rotor device to maintain extremely high stability and balance during operation, reaching an ultra-high rotational speed of 180,000 revolutions per minute.

[0029] Embodiment 1

[0030] In this embodiment, the rotor device includes a mandrel 4, with a magnet 5 and a protective sleeve 2 sleeved on the outside of the mandrel in sequence. The two ends of the mandrel are respectively provided with a left half shaft 1 and a right half shaft 3; the two ends of the mandrel are respectively provided with external threads 41 with opposite spiral directions, and the left and right half shafts are respectively provided with internal screw holes matching the external threads, and the spiral directions of the left and right half shafts are opposite, so that during the rotation of the rotor, the left and right half shafts at both ends will become tighter and tighter, maintaining the stability of the rotor and the safety of operation. One end of the left half shaft is provided with a thrust disk structure, and the left half shaft and the thrust disk structure are an integral structure. The flatness of the thrust disk structure is less than 0.005 mm. One end of the left half shaft is provided with a thrust disk connection column extending outward, and the thrust disk structure is fixed on the thrust disk connection column. Through the thrust disk connection column, a gap of 3 - 6 cm is formed between the thrust disk structure and the left half shaft. Further, the left and right half shafts are hollow structures, respectively provided with central holes, and the depth of the central holes accounts for 2 / 3 - 4 / 5 of the height of the left and right half shafts. The aperture of the central hole is 1 / 5 - 1 / 2 of the diameter of the left and right half shafts, which can effectively reduce the weight of the product, quickly increase the rotational speed of the rotor and reduce the starting time. The connection end of the left half shaft and the mandrel is provided with a left half shaft connection part, and the left half shaft connection part is provided with two left side installation positioning reference surfaces 13, which are respectively used to position the magnet and the protective sleeve. The connection end of the right half shaft and the mandrel is provided with a right half shaft connection part, and the right half shaft connection part is provided with two right side installation positioning reference surfaces 31.

[0031] Specifically, a clearance fit is adopted between the mandrel 4 and the magnet 5, and the clearance size is 0.02 - 0.04 mm; an interference fit is adopted between the magnet 5 and the protective sleeve 2, and the interference amount is 0.12 - 0.14 mm. The protective sleeve 2 is made of Inconel718 nickel-based alloy. The left and right half shafts 1 and 3 of the motor rotor are respectively thread-connected to the mandrel 4, and Loctite 263 thread locking agent is used for strengthening fixation, which can withstand a high temperature of 180 °C and prevent thread loosening.

[0032] Further, one end of the mandrel 4 is provided with a protruding step 42 for limiting the magnet 5, and the external thread on the left side of the mandrel is provided on the step; the other end of the mandrel is provided with a connection column 43 extending outward, and the external thread on the right side of the mandrel is provided on the connection column, and the diameter of the connection column is smaller than the diameter of the mandrel.

[0033] Further, the connection end of the left half shaft 1 and the mandrel 4 is provided with a left half shaft connection part, and a left internal thread matching the step is provided in the central hole of the left half shaft; the connection end of the right half shaft 3 and the mandrel 4 is provided with a right half shaft connection part, and a right internal thread matching the connection column is provided in the central hole of the right half shaft; the diameters of the left and right half shaft connection parts are less than or equal to the diameter of the magnet. If the diameters of the left and right half shaft connection parts are equal to the diameter of the magnet, it can make the fit better during the subsequent assembly of the protective sleeve and improve the degree of integration.

[0034] Furthermore, one end of the left half shaft 1 is provided with a thrust disc structure 11. The left half shaft and the thrust disc structure are an integrated structure, forming an integrated high-precision connection between the motor shaft and the thrust disc, reducing the instability of the clearance between the thrust disc side and the housing while ensuring the overall strength of the rotor, enabling the rotor to reach a high rotational speed. The flatness of the thrust disc structure is less than 0.005 mm. The left and right half shafts are connected to the protective sleeve by welding, and the welding penetration depth is greater than 2 mm.

[0035] Embodiment 2

[0036] In this specific embodiment, the motor rotor device includes a core shaft 4. A magnetic steel 5 and a protective sleeve 2 are sequentially sleeved outside the core shaft. The two ends of the core shaft 4 are respectively provided with left and right half shafts 1 and 3. The left and right half shafts 1 and 3 are hollow structures with central holes. The aperture of the central hole is 1 / 5 - 1 / 2 of the rotor diameter, which can reduce the weight of the entire rotor and increase the rotational speed during rotation. The left half shaft 1 also integrates a thrust disc structure 11. The overall dimensional accuracy is ensured through integral machining. The runout of the thrust disc end face with respect to the central axis of the motor shaft is less than 0.01 mm, and its own flatness is less than 0.005 mm, which can effectively reduce the instability of the clearance between the thrust disc side and the housing. There is a concave connecting groove between the thrust disc structure 11 and the body of the left half shaft; external threads matching with the left and right half shafts are respectively provided at the two ends of the core shaft 4, and internal screw holes matching with the external threads are respectively provided on the left and right half shafts. Two assembly planes are provided on the external thread at the right end of the core shaft, facilitating tightening when assembling the right half shaft to meet the expected torque requirements.

[0037] Specifically, the spiral directions of the external threads at both ends of the core shaft are opposite, that is, the left and right half shafts 1 and 3 are respectively matched with the core shaft 4 through left-handed and right-handed threads to ensure that the rotor becomes tighter during operation and achieves a tight integrated effect. A clearance fit is adopted between the core shaft 4 and the magnetic steel 5, and the clearance size is 0.02 - 0.04 mm. The left and right half shafts of the motor rotor are made of 17 - 4PH martensitic precipitation hardening stainless steel, and under the H900 heat treatment state, the hardness is between HRC40 - 48.

[0038] The protective sleeve 2 is made of Inconel718 nickel-based alloy. The left and right half shafts of the motor rotor are thread-connected to the core shaft, and Loctite 263 thread locking agent is used to strengthen the fixation, which can withstand a high temperature of 180 °C and prevent thread loosening.

[0039] An interference fit is adopted between the magnetic steel 5 and the protective sleeve 2, and the interference amount is 0.12 - 0.14 mm; the protective sleeve is heated to 500 °C and assembled to the outside of the magnetic steel through a guiding tooling. After assembly, to ensure the overall strength of the rotor, the protective sleeve is welded to the left and right half shafts, and the welding penetration depth is greater than 2 mm.

[0040] The permanent magnet is made of samarium cobalt permanent magnet steel. The mandrel and the permanent magnet adopt a precision clearance fit, with the clearance between 0.02 - 0.04 mm, and Loctite 620 retaining adhesive is used for fixation, which can withstand high temperature of 230 °C to avoid the permanent magnet cracking caused by micro-vibration. To avoid affecting the products at both ends of the rotor after the permanent magnet is magnetized, a protective sleeve made of 718 nickel-based alloy material is covered on the outer side of the mandrel and is press-fitted onto the outer side of the permanent magnet by interference fit to provide a clamping force to prevent the permanent magnet from cracking due to centrifugal force during the high-speed rotation of the rotor.

[0041] The structure of the utility model is simple, easy to assemble, and has high precision, enabling the rotor to reach an ultra-high speed of 180,000 revolutions per minute, having great application prospects.

[0042] The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, several simple deductions or replacements can be made, which should all be regarded as belonging to the protection scope of the utility model.

Claims

1. A motor rotor device, characterized in that: The rotor device includes a mandrel, on the outside of which a magnetic steel and a protective sleeve are successively sleeved, and left and right half shafts are respectively provided at both ends of the mandrel; External threads with opposite spiral directions are respectively provided at both ends of the mandrel, internal screw holes matching with the external threads are respectively provided on the left and right half shafts, and the spiral directions of the left and right half shafts are opposite; A thrust disc structure is provided at one end of the left half shaft, the left half shaft and the thrust disc structure are of an integral structure, the flatness of the thrust disc structure is less than 0.005 mm, a thrust disc connection column extending outwards is provided at one end of the left half shaft, and the thrust disc structure is fixed on the thrust disc connection column, and a gap of 3-6 cm is formed between the thrust disc structure and the left half shaft through the thrust disc connection column; The left and right half shafts are of a hollow structure and are respectively provided with central holes, and the depth of the central holes accounts for 2 / 3-4 / 5 of the height of the left and right half shafts; A left half shaft connection part is provided at the connection end of the left half shaft and the mandrel, and two left-side installation positioning reference surfaces are provided on the left half shaft connection part. A right half shaft connection part is provided at the connection end of the right half shaft and the mandrel, and one right-side installation positioning reference surface is provided on the right half shaft connection part.

2. The motor rotor device according to claim 1, characterized in that: A clearance fit is adopted between the mandrel and the magnetic steel, and the clearance size is 0.02-0.04 mm; an interference fit is adopted between the magnetic steel and the protective sleeve, and the interference amount is 0.12-0.14 mm.

3. A motor rotor device according to claim 1, characterized in that: The aperture of the central hole is 1 / 5-1 / 2 of the diameter of the left and right half shafts.

4. A motor rotor device according to claim 1, characterized in that: A raised step is provided at one end of the mandrel for limiting the magnetic steel, and external threads on the left side of the mandrel are provided on the step; a connection column extending outwards is provided at the other end of the mandrel, external threads on the right side of the mandrel are provided on the connection column, and the diameter of the connection column is smaller than the diameter of the mandrel.

5. A motor rotor device according to claim 4, characterized in that: A left screw hole matching with the step is provided in the central hole of the left half shaft; a right screw hole matching with the connection column is provided in the central hole of the right half shaft; the diameters of the left and right half shaft connection parts are less than or equal to the diameter of the magnetic steel.

6. A motor rotor device according to claim 1, characterized in that: The left and right half shafts and the protective sleeve are connected by welding, and the welding penetration depth is greater than 2 mm.

7. A motor rotor device according to claim 1, characterized in that: The magnetic steel is made of samarium cobalt permanent magnet steel, and the protective sleeve is made of nickel-based alloy.

Images