A disc-type motor rotor back plate, rotor and its motor

Abstract

An embodiment of the present invention relates to a disc motor rotor back plate, a rotor and its motor. The rotor back plate includes a silicon steel coil, and the silicon steel strips are wound to form an annular silicon steel coil with a multi-layer silicon steel strip structure. One or more silicon steel coil fixing holes are provided on the silicon steel coil, and the openings of the silicon steel coil fixing holes are formed on the inner side wall and / or the outer side wall of the ring of the silicon steel coil. The silicon steel coil fixing holes are formed on at least two layers of silicon steel strips of the silicon steel coil, and fixing elements are embedded in the silicon steel coil fixing holes. The rotor has the above-mentioned rotor back plate. The motor has the above-mentioned rotor. This rotor has good electromagnetic performance, high motor efficiency, simple structure, light weight and good structural strength.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and particularly relates to a rotor back plate of a disc motor, a rotor and a motor thereof. Background Art

[0002] A disc motor is an axial flux motor. The stator is composed of a coil and an iron core, and the rotor is composed of a magnetic element and a back plate of a visco-magnetic element. The disc motor has a problem of excessive axial magnetic pull, and it is required that both the stator and the rotor have high structural strength to resist axial deformation caused by magnetic pull; the rotor back plate not only requires good magnetic conductivity, but also needs strong performance in resisting electromagnetic losses such as eddy current and hysteresis.

[0003] In the prior art, a kind of rotor back plate of a disc motor is made of a whole piece of high-quality electrical steel, such as electrolytic iron or 10# steel. This kind of back plate has good magnetic conductivity but low resistivity, and a relatively large thickness. The steel plate is an integral body without insulation layering, and has large eddy current loss under a changing magnetic field, and there are defects in the motor efficiency; the heat generated by the eddy current is serious, which causes the remanence of the magnetic steel to decrease or even demagnetize; the long-term high-temperature heating may cause the adhesive between the magnetic element and the back plate to fail and the magnetic steel to fall off. To solve the problem of back plate heating, it is necessary to additionally increase a special cooling system to cool the rotor, which increases the amount of parts and materials used, and also results in low motor efficiency.

[0004] In the prior art, there is also a kind of rotor back plate of a disc motor composed of a silicon steel coil and various auxiliary support parts. Since the silicon steel coil itself cannot provide good structural strength, it is necessary to add parts with higher strength for support to resist the deformation caused by magnetic pull. For example, an aluminum alloy shell A and a stainless steel strip T (refer to Figure 1a 、 Figure 1b ) are added around the silicon steel coil S to wrap the silicon steel coil S and the magnetic element M therein. This structure uses too many parts, increases the material consumption, and increases the weight of the rotor. Since the added parts are conductive materials and form closed loops C1 and C2, under a changing magnetic field, an induced electromotive force is generated in the loop, and then additional losses are generated, affecting the motor efficiency.

[0005] In summary, in the prior art, due to the structural problems of the rotor of the disc motor, there are technical problems such as poor electromagnetic performance, low motor efficiency, complex structure, large weight, and weak structural strength. Summary of the Invention

[0006] In order to solve the technical problems of poor electromagnetic performance, low motor efficiency, complex structure, large weight, and weak structural strength of the above-mentioned disc motor rotor, an embodiment of the present invention provides a disc motor rotor back plate. The rotor back plate includes a silicon steel coil. The silicon steel strips are wound to form a circular silicon steel coil with a multi-layer silicon steel strip structure. One or more silicon steel coil fixing holes are provided on the silicon steel coil. The openings of the silicon steel coil fixing holes are formed on the inner side wall and / or the outer side wall of the circle of the silicon steel coil. The silicon steel coil fixing holes are formed on at least two layers of silicon steel strips of the silicon steel coil, and fixing elements are embedded in the silicon steel coil fixing holes.

[0007] Further, the silicon steel coil fixing holes are through holes.

[0008] Further, the multi-layer silicon steel strips are bonded to each other by glue.

[0009] Further, the fixing elements are screws or pins, and the screws are preferably set screws.

[0010] Further, the fixing elements and the hole walls of the silicon steel coil fixing holes are bonded to each other by glue.

[0011] Further, the silicon steel coil fixing holes are arranged along the radial direction of the rotor back plate.

[0012] Further, the rotor back plate further has a rotating connector for connecting the rotor back plate and the motor shaft.

[0013] Further, one or more rotating connector fixing holes are provided on the rotating connector. The rotating connector fixing holes correspond to the silicon steel coil fixing holes, and the fixing elements are embedded in the corresponding silicon steel coil fixing holes and the rotating connector fixing holes.

[0014] Further, the rotor back plate further has a fixing ring, and the fixing ring is sleeved on the outer side of the circle of the silicon steel coil and / or arranged on the inner side of the circle of the silicon steel coil.

[0015] Further, the rotor back plate further has a fixing ring. The fixing ring is sleeved on the outer side of the circle of the silicon steel coil or arranged on the inner side of the circle of the silicon steel coil. The fixing ring and the rotating connector are respectively arranged on different sides of the circle of the silicon steel coil.

[0016] Further, one or more fixing ring fixing holes are provided on the fixing ring. The fixing ring fixing holes correspond to the silicon steel coil fixing holes and the rotating connector fixing holes, and the fixing elements are embedded in the corresponding silicon steel coil fixing holes, the rotating connector fixing holes and the fixing ring fixing holes.

[0017] An embodiment of the present invention also provides a disc motor rotor. The rotor includes the above-mentioned rotor back plate and a plurality of magnetic elements arranged on the rotor back plate.

[0018] Further, the main body of the fixing hole on the rotor back plate is located in the following area: the plane passing through the central axis of the rotor back plate and the center of gravity of the magnetic element intersects with the plane for fixing the magnetic element of the silicon steel coil to form an intersection line. Taking this intersection line as the axis, the area on the rotor back plate within 55° on both sides of the plane passing through the central axis of the rotor back plate and the center of gravity of the magnetic element.

[0019] Further, the fixing holes on the rotor back plate are arranged corresponding to the magnetic elements, and the center lines of the fixing holes on the rotor back plate are located on the symmetry planes of the corresponding magnetic elements.

[0020] Further, when there are multiple fixing holes on the rotor back plate corresponding to the same magnetic element, the multiple fixing holes on the rotor back plate are symmetrically arranged in the circumferential direction with respect to the symmetry plane of the corresponding magnetic element, or the center lines of the multiple fixing holes on the rotor back plate corresponding to the same magnetic element are all located on the symmetry plane of the corresponding magnetic element.

[0021] Further, the magnetic element is a permanent magnet or a soft magnet.

[0022] Further, the number of the fixing holes on the rotor back plate is equal to a factor of the number of magnetic poles of the rotor, or an integer multiple of the factor of the number of magnetic poles.

[0023] Further, when there are multiple fixing holes on the rotor back plate, the multiple fixing holes are evenly distributed in the circumferential direction.

[0024] An embodiment of the present invention further provides a disc motor, and the motor includes the rotor as described above.

[0025] Further, the rotor back plate is fixedly connected to the motor shaft.

[0026] Further, one or more fixing holes are provided on the motor shaft, the fixing holes on the motor shaft correspond to the fixing holes on the rotor back plate, and the fixing element is embedded in the corresponding fixing holes on the rotor back plate and the motor shaft.

[0027] Advantages of the embodiment of the present invention: In the disc motor rotor back plate proposed in the embodiment of the present invention, a silicon steel coil with excellent magnetic conductivity is used as the magnetic conductive material, with small eddy current loss and less heat generation, and it will not affect the magnetic properties of the magnetic steel; no conductive loop will be formed between the structural members, no additional loss will be generated, avoiding the defects of the prior art, enabling the rotor to have excellent electromagnetic performance, significantly improving the motor efficiency, and having a simple structure, fewer components, small weight, and greatly enhanced structural strength. This structure can effectively improve the axial shear strength, tangential shear strength and centrifugal force resistance strength of the rotor back plate based on the silicon steel coil. Description of the Drawings

[0028] Figure 1aIt is a part of the top view of the prior art rotor proposed in the embodiment of the present invention;

[0029] Figure 1b It is a cross-sectional view of the prior art rotor proposed in the embodiment of the present invention;

[0030] Figure 2 It is a three-dimensional view of the rotor proposed in the embodiment of the present invention;

[0031] Figure 3a It is a cross-sectional view of the rotor of an implementation manner proposed in the embodiment of the present invention;

[0032] Figure 3b It is a cross-sectional view of the rotor of another implementation manner proposed in the embodiment of the present invention;

[0033] Figure 4a It is a schematic diagram of the rotary connector arranged on the outer side of the circular ring of the silicon steel coil proposed in the embodiment of the present invention;

[0034] Figure 4b It is a schematic diagram of the rotary connector arranged on the inner side of the circular ring of the silicon steel coil proposed in the embodiment of the present invention;

[0035] Figure 5a It is a schematic diagram of the fixed structure of the rotary connector arranged on the outer side of the circular ring of the silicon steel coil proposed in the embodiment of the present invention;

[0036] Figure 5b It is a schematic diagram of the fixed structure of the rotary connector arranged on the inner side of the circular ring of the silicon steel coil proposed in the embodiment of the present invention;

[0037] Figure 6 It is a schematic diagram of the hole position of the rotor proposed in the embodiment of the present invention;

[0038] Figure 7 It is a schematic diagram of an implementation manner of the rotor with one fixing element proposed in the embodiment of the present invention;

[0039] Figure 8a It is a schematic diagram of an implementation manner of the rotor with multiple fixing elements proposed in the embodiment of the present invention;

[0040] Figure 8b It is a schematic diagram of another implementation manner of the rotor with multiple fixing elements proposed in the embodiment of the present invention;

[0041] Figure 9a It is a schematic diagram of the circular pressing ring of the rotor for testing the shear resistance proposed in the embodiment of the present invention;

[0042] Figure 9b It is a schematic diagram of the setting of the circular pressing ring for testing the shear resistance of the circular pressing ring of the rotor proposed in the embodiment of the present invention. Detailed implementation manners

[0043] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the following further elaborates on the present invention in detail with reference to specific embodiments and the accompanying drawings. However, those skilled in the art are aware that the present invention is not limited to the drawings and the following embodiments.

[0044] Embodiment 1 Rotor Backplate

[0045] Referring to Figures 2 - 9b , an embodiment of the present invention provides a disc-type motor rotor backplate. The rotor backplate includes a silicon steel coil 12; the silicon steel strips are wound to form a circular silicon steel coil 12 with a multi-layer silicon steel strip structure. One or more silicon steel coil fixing holes are provided on the silicon steel coil 12. The openings of the silicon steel coil fixing holes are formed on the inner sidewall and / or the outer sidewall of the ring of the silicon steel coil. The silicon steel coil fixing holes are formed on at least two layers of silicon steel strips of the silicon steel coil 12. A fixing element 13 is embedded in the silicon steel coil fixing holes to improve the structural strength of the rotor backplate.

[0046] Preferably, the silicon steel coil fixing holes are through holes. This embodiment has greater structural strength.

[0047] Preferably, the silicon steel coil 12 is formed by winding and bonding silicon steel strips with glue, that is, the multi-layer silicon steel strips are bonded to each other by glue. Gluing can increase the strength. After the glue cures, the silicon steel strips are bonded to each other, providing additional shear strength and anti-centrifugal force strength.

[0048] The rotor backplate is used to fix magnetic elements to manufacture a rotor. The rotor backplate can be fixedly connected to the motor shaft through a rotating connector or directly fixedly connected to the motor shaft.

[0049] <Fixing Element>

[0050] Referring to Figure 3a , Figure 3b , preferably, the fixing element is a screw, more preferably a set screw 131. Alternatively, the fixing element can also be a dowel pin 132. Using a fixing element can strengthen the axial and tangential shear strength between the silicon steel coil layers. In particular, the thread and screw head structure of the set screw can provide a greater pressing force between the silicon steel coil layers, generating a greater anti-shearing friction force, and can also resist centrifugal force well; the pin structure of the set screw can increase the shear strength between the silicon steel coil layers.

[0051] Preferably, the fixing element 13 is embedded in the silicon steel coil fixing hole after being coated with glue, that is, the fixing element 13 and the hole wall of the silicon steel coil fixing hole are bonded to each other by glue. Gluing can increase the strength. After the glue cures, the fixing element is bonded to the hole wall, providing additional shear strength and anti-centrifugal force strength.

[0052] Preferably, the silicon steel coil fixing holes are arranged along the radial direction of the rotor backplate.

[0053] <Rotating connector>

[0054] Refer to Figure 4a 、 Figure 4b Preferably, the rotor back plate further has a rotating connector 21 for connecting the rotor back plate and the motor shaft.

[0055] The rotating connector 21 can be arranged on the outer side of the ring of the silicon steel coil 12. For example, the annular rotating connector is fixed on the outer side of the ring of the silicon steel coil 12, and the motor shaft is fixedly connected to the rotating connector by means such as screwing, welding, etc. Figure 4a The shown rotating connector 21 is arranged on the outer side of the ring of the silicon steel coil 12.

[0056] The rotating connector 21 can also be arranged on the inner side of the ring of the silicon steel coil 12. For example, an annular or cylindrical rotating connector is fixedly connected to the inner side of the ring of the silicon steel coil 12, and the motor shaft is fixedly connected to the rotating connector by means such as screwing, welding, etc. Figure 4b The shown rotating connector 21 is arranged on the inner side of the ring of the silicon steel coil 12.

[0057] Those skilled in the art can understand that the rotating connector 21 can also be arranged at other positions on the silicon steel coil 12 as long as it can connect the motor shaft and the rotor back plate.

[0058] Preferably, one or more rotating connector fixing holes are provided on the rotating connector 21, and the rotating connector fixing holes correspond to the silicon steel coil fixing holes. Thus, the fixing element 13 can be embedded into the corresponding silicon steel coil fixing holes and the rotating connector fixing holes to fix the rotating connector 21 and the silicon steel coil 12 into one body, improving the structural strength of the rotor back plate.

[0059] The rotating connector fixing hole can be a through hole (as shown in Figure 5a ), or a blind hole (as shown in Figure 5b ).

[0060] The rotating connector 21 and the silicon steel coil 12 can be integrally manufactured. Taking the cylindrical rotating connector as an example, the silicon steel strips are directly wound around the rotating connector with the rotating connector as the axis. They can also be manufactured separately and then fixedly connected and assembled. Correspondingly, when opening the fixing holes, in the case of integral manufacturing, the fixing holes can be directly opened on the two components. When manufacturing separately, the fixing holes can be opened on the two components respectively and then assembled, or the fixing holes can be opened on the two components after assembly.

[0061] Such as Figure 5aAs shown, the rotating connector 21 is arranged on the outer side of the ring of the silicon steel coil 12. The fixing holes of the rotating connector correspond to the fixing holes of the silicon steel coil. The fixing element 13 is embedded into the corresponding fixing holes of both, fixing the rotating connector 21 and the silicon steel coil 12. Figure 5a Taking the pin as the fixing element as an example to show its structure, its manufacturing method is: drilling pin holes on the rotating connector 21 and the silicon steel coil 12, applying glue to the pin and embedding it into the holes, locking the rotating connector 21 and the silicon steel coil 12 together.

[0062] As Figure 5b shown, the rotating connector 21 is arranged on the inner side of the ring of the silicon steel coil 12. The fixing holes of the rotating connector correspond to the fixing holes of the silicon steel coil. The fixing element 13 is embedded into the corresponding fixing holes of both, fixing the rotating connector 21 and the silicon steel coil 12. Figure 5b Taking the socket head cap screw as the fixing element as an example to show its structure, its manufacturing method is: drilling a pin hole on the silicon steel coil 12, drilling a threaded hole on the rotating connector 21, applying glue to the socket head cap screw and embedding it into the holes, tightening the screw, and the screw head pressing against the outer side of the ring of the silicon steel coil 12, locking the rotating connector 21 and the silicon steel coil 12 together.

[0063] <Fixing ring>

[0064] Preferably, the rotor back plate further has a fixing ring, and the fixing ring is sleeved on the outer side of the ring of the silicon steel coil 12 and / or arranged on the inner side of the ring of the silicon steel coil 12. The fixing ring can be one or more. For example, when there are two fixing rings, one fixing ring can be arranged on the outer side of the ring of the silicon steel coil 12 and the other on the inner side of the ring of the silicon steel coil 12.

[0065] Preferably, when the rotor back plate has a rotating connector, the fixing ring and the rotating connector are respectively arranged on different sides of the ring of the silicon steel coil 12, that is, when the rotating connector is arranged on the outer side of the ring of the silicon steel coil, the fixing ring is arranged on the inner side of the ring of the silicon steel coil, and when the rotating connector is arranged on the inner side of the ring of the silicon steel coil, the fixing ring is arranged on the outer side of the ring of the silicon steel coil. Arranging the fixing ring on the inner side of the ring of the silicon steel coil can play a role in supporting and fastening the silicon steel coil, and sleeving it on the outer side of the ring of the silicon steel coil can play a role in locking the silicon steel coil. Therefore, the strength of the rotor back plate can be improved.

[0066] Preferably, the fixing ring has one or more fixing holes of the fixing ring, and the fixing holes of the fixing ring correspond to the fixing holes of the silicon steel coil. Thus, the fixing element 13 can be embedded into the corresponding fixing holes of the fixing ring and the silicon steel coil, fixing the fixing ring and the silicon steel coil as a whole to improve the structural strength of the rotor back plate.

[0067] When the rotor back plate further has a rotating connector, the fixing ring fixing holes correspond to both the silicon steel coil fixing holes and the rotating connector fixing holes. Thus, the fixing element 13 can be embedded into the corresponding silicon steel coil fixing holes, rotating connector fixing holes and fixing ring fixing holes to fix the rotating connector 21, the silicon steel coil 12 and the fixing ring into one body, so as to improve the structural strength of the rotor back plate.

[0068] The fixing ring fixing holes can be through holes or blind holes.

[0069] The silicon steel coil fixing holes, the rotating connector fixing holes and the fixing ring fixing holes can be pin holes, threaded holes, or part of them can be pin holes and part of them can be threaded holes. The types of the holes can be set according to actual needs.

[0070] Those skilled in the art can understand that the composition of the rotor back plate includes a silicon steel coil. Optionally, it can also include a rotating connector and / or a fixing ring. In different compositions, these corresponding silicon steel coil fixing holes, rotating connector fixing holes and fixing ring fixing holes constitute the rotor back plate fixing holes. Due to the different compositions of the rotor back plate, the rotor back plate fixing holes can only include silicon steel coil fixing holes, or can include silicon steel coil fixing holes and rotating connector fixing holes, or include silicon steel coil fixing holes and fixing ring fixing holes, or simultaneously include silicon steel coil fixing holes, rotating connector fixing holes and fixing ring fixing holes.

[0071] Embodiment 2 Rotor

[0072] As Figure 2 shown, the embodiment of the present invention further provides a disc motor rotor, and the rotor includes the above-mentioned rotor back plate and a plurality of magnetic elements 20 arranged on the rotor back plate. The magnetic elements 20 are fixed on the rotor back plate in a conventional manner in the art to form a rotor.

[0073] The magnetic elements 20 can be permanent magnets and can be fixed on the silicon steel coil 12 by means such as gluing and mechanical fastening, and are alternately and evenly arranged along the circumference with N / S poles.

[0074] The magnetic elements 20 can also be soft magnets and can be fixed on the silicon steel coil 12 by means such as gluing, welding and mechanical fastening.

[0075] <Number of holes>

[0076] Preferably, the number of the rotor back plate fixing holes is equal to a factor of the number of poles of the rotor, or an integer multiple of the factor of the number of poles. For example, if the number of poles is 12, the number of the rotor back plate fixing holes can be 12, 6, 4, 3 or 2, etc.

[0077] When there are multiple fixing holes on the rotor back plate, the multiple fixing holes on the rotor back plate are preferably evenly distributed in the circumferential direction of the rotor back plate, that is, the arrangement of the holes does not change the center of gravity of the rotor back plate.

[0078] <Position of the hole>

[0079] Referring to Figure 6 , the inventor further found that the position of the fixing hole on the rotor back plate is an important factor affecting the performance of the motor. If the position is not properly selected, it will lead to a loss of motor performance. In this embodiment, it is preferred that the main body of the fixing hole on the rotor back plate is located in the following area: the plane passing through the central axis of the rotor back plate and the center of gravity of the magnetic element 20 intersects with the plane for fixing the magnetic element 20 of the silicon steel coil 12 to form an intersection line. Taking this intersection line as the axis, the area on the rotor back plate within 55° on both sides of the plane passing through the central axis of the rotor back plate and the center of gravity of the magnetic element 20. Figure 6 In

[0080] , in order to select the best opening position, the embodiment of the present invention analyzes and compares this. A total of four opening positions are selected. As Figure 6 shown, the four fixing holes are successively located at positions I, II, III, and IV. The saturation torque simulation data is shown in Table 1. It can be seen from this table that the position of the hole has an important influence on the motor performance.

[0081] Table 1 Comparison of saturation torque simulation data for different opening positions

[0082] Hole position Saturation torque / N·m Saturation torque ratio Without hole 380 100％ Position I 380 100％ Position II 378 99.5％ Position III 291 76.5％ Position IV 225 59.0％

[0083] Referring to Figure 7 , preferably, the fixing hole on the rotor back plate is correspondingly arranged with the magnetic element 20, and the center line of the fixing hole on the rotor back plate is located on the symmetry plane of the corresponding magnetic element 20.

[0084] Referring to Figure 8a , Figure 8b , when there are multiple fixing holes on the rotor back plate corresponding to the same magnetic element, the multiple fixing holes on the rotor back plate can be arranged to be symmetrically arranged in the circumferential direction with respect to the symmetry plane of the corresponding magnetic element ( Figure 8a ), or, it can also be arranged such that the center lines of the multiple fixing holes on the rotor back plate corresponding to the same magnetic element are all located on the symmetry plane of the corresponding magnetic element, so that the multiple fixing holes are arranged axially ( Figure 8b ).

[0085] Obviously, those skilled in the art can understand that the rotor back plate or each component of the rotor in the above embodiments (such as silicon steel coils, rotating connectors, fixing rings, etc.) and the setting methods of various different fixing holes in their structures (such as the number, position, etc.), and the fixing methods using different fixing elements (such as screws, set screws, pins, etc.) can be combined as needed.

[0086] Embodiment 3 Disc motor

[0087] The embodiment of the present invention also provides a disc motor, and the motor includes the above rotor.

[0088] Preferably, the rotor back plate is fixedly connected to the motor shaft. For example, in one embodiment, the silicon steel strips are directly wound around the motor shaft to form a silicon steel coil with a multi-layer silicon steel strip structure. One or more fixing holes are opened in the silicon steel coil and the motor shaft, and the fixing holes are correspondingly located on the silicon steel coil and the motor shaft to form a silicon steel coil fixing hole (i.e., the rotor back plate fixing hole) and a motor shaft fixing hole. The opening of the silicon steel coil fixing hole is formed on the outer side wall of the circular ring of the silicon steel coil, and the fixing element is embedded into the silicon steel coil fixing hole and the motor shaft fixing hole to fix the silicon steel coil 12 on the motor shaft.

[0089] Those skilled in the art can understand that the silicon steel coil can also be formed without directly winding it around the motor shaft. Instead, a circular silicon steel coil can be formed first, and then one or more corresponding silicon steel coil fixing holes (i.e., the rotor back plate fixing holes) and motor shaft fixing holes are opened on the silicon steel coil and the motor shaft respectively. After the fixing holes of the two are correspondingly assembled, the fixing element is then embedded into the corresponding fixing holes to fix the silicon steel coil on the motor shaft. It is also possible to first wind a circular silicon steel coil, then assemble it with the motor shaft, and then open holes on the assembled silicon steel coil and the motor shaft to form a silicon steel coil fixing hole and a motor shaft fixing hole. Finally, the fixing element is embedded into the fixing hole to fix the silicon steel coil to the motor shaft.

[0090] This embodiment does not require an additional rotating connector, has a simple structure, and high structural strength.

[0091] Embodiment 4 Manufacturing method of disc rotor

[0092] The manufacturing method of the disc motor rotor proposed by the embodiment of the present invention includes the following steps:

[0093] S1. Wind the silicon steel strips;

[0094] S2. After winding to a predetermined size, cut off the silicon steel strips and fix the ends of the silicon steel strips to form a silicon steel coil 12 with a multi-layer silicon steel strip structure;

[0095] S3. Shape and clean the silicon steel coil 12 to make its surface flat and smooth;

[0096] S4. Open one or more fixing holes for the silicon steel coil 12 on the inner circumferential wall and / or the outer circumferential wall of the silicon steel coil 12, and embed the fixing element 13 into the fixing holes for the silicon steel coil;

[0097] S5. Fix the magnetic element 20 at a predetermined position on the silicon steel coil 12.

[0098] The way to fix the end of the silicon steel strip, for example, by welding.

[0099] The way to fix the magnetic element, for example, by bonding.

[0100] For further illustration of the present invention, preferably, taking the rotary connector 21 arranged on the inner circumferential wall of the silicon steel coil as an example, the manufacturing method of the disc-type motor rotor includes the following steps:

[0101] S1. Fix the starting end of the silicon steel strip on the rotary connector 21, and wind the silicon steel strip after applying glue;

[0102] S2. After winding to a predetermined size, cut off the silicon steel strip and fix the end of the silicon steel strip to form a silicon steel coil 12 with a multi-layer silicon steel strip structure;

[0103] S3. Shape and clean the silicon steel coil 12 to make its surface flat and smooth;

[0104] S4. Heat the silicon steel coil 12 and the rotary connector 21 to cure the glue;

[0105] S5. Through the outer circumferential wall of the silicon steel coil 12, according to the preset position of the magnetic element 20, open one or more fixing holes for the rotor back plate on the silicon steel coil 12 and the rotary connector 21 along the radial direction, so that the center line of the fixing hole for the rotor back plate is located on the symmetry plane corresponding to the magnetic element 20, plug and play screws and apply glue into the fixing holes, and lock and fix the silicon steel coil 12 and the rotary connector 21;

[0106] S6. Align the magnetic element 20 so that the center line of the fixing hole for the rotor back plate is located on the symmetry plane corresponding to the magnetic element 20, and fix the magnetic element 20 on the silicon steel coil 12.

[0107] Those skilled in the art can understand that the above manufacturing method is only a preferred implementation manner and does not limit the present invention. For example, the setting method and the fixing method of the fixing holes can be implemented in the manner described in Embodiments 1 and 2, and various implementation manners can be combined according to actual needs.

[0108] <Structural strength test>

[0109] I. Test samples:

[0110] ① The silicon steel strip is wound after applying glue, the end is welded, and there is no plug and play screw.

[0111] ②The silicon steel strips are wound without applying glue, welded at the ends, and 4 setscrew bolts are evenly arranged along the circumferential direction.

[0112] ③The silicon steel strips are wound with glue applied, welded at the ends, and 4 setscrew bolts are evenly arranged along the circumferential direction.

[0113] Sample parameters: The outer diameter of the silicon steel coil is 210 mm, the inner diameter is 120 mm, and the thickness is 17 mm.

[0114] II. Test results:

[0115] 1. Centrifugal force resistance

[0116] Through mechanical analysis and calculation, the allowable tensile strength at the edge of the rotor back plate under high-speed rotation. The higher the rotational speed of the rotor back plate, the greater the axial tensile strength it bears, as shown in Table 2.

[0117] Table 2 Theoretical values of the allowable tensile strength at the edge of the rotor back plate under high-speed rotation

[0118] Rotational speed / rpm Tensile strength / Mpa 7200 49 9600 88 12000 137 15000 214

[0119] In the embodiment of the present invention, a limit strength test of the rotor back plate under high-speed rotation was also carried out. When comparing the three samples during the process of gradually increasing the rotational speed, the integrity of the structure was observed, and the results are shown in Table 3.

[0120] Table 3 Test results of the limit strength of the rotor back plate under high-speed rotation

[0121] Sample Rotational speed / rpm Status Sample ① 7000 Broken Sample ② 12000 Intact Sample ③ 12000 Intact

[0122] The test results show that for Sample ①, at 7000 rpm, the solder joints could not withstand the axial tensile force generated by rotation, and the silicon steel coil cracked; for Samples ② and ③ fixed with setscrew bolts, when the rotational speed was increased to the limit speed of 12000 rpm, the structure remained intact. It can be seen that the setscrew bolts provide good centrifugal force resistance strength.

[0123] 2. Shear force resistance (pressure test)

[0124] Refer to Figure 9a 、 Figure 9b , a circular pressure ring 31 is set on the rotor back plate, and the force applied to the pressure ring is used to simulate the axial magnetic tensile force on the rotor. The deformation of the silicon steel coil is measured, and the difference is used to represent the deformation of the silicon steel coil under different pressures, simulating the magnetic tensile force on the entire surface of the silicon steel coil. The deformation of the silicon steel coil is shown in Table 4.

[0125] Table 4 Force applied to the circular pressure ring

[0126]

[0127] Through force analysis and calculation, it can be known that when the air gap between the stator and the rotor is 1.0 mm, the maximum magnetic pull force between the stator and the rotor is 8000 N, that is, when the stator is fixed, the maximum axial magnetic pull force on the entire rotor is 8000 N.

[0128] As can be seen from Table 4, for Sample ③ under different test conditions, when a force of 8000 N is applied, the overall deformation of the silicon steel coil is 0.08 mm, and there is no slightest crack in the silicon steel coil, and its performance is very excellent; the performance of Sample ② is slightly worse, but it also has relatively high structural strength; the structural strength of Sample ① is relatively low, and it may crack and fail during normal operation.

[0129] The above test results show that the structural strength of the rotor back plate of the present invention is very excellent.

[0130] The rotor of the embodiment of the present invention uses a silicon steel coil with excellent magnetic conductivity as the magnetic conductive material, which has small eddy current loss, low heat generation, does not affect the magnetic properties of magnetic components, has few structural parts used for the rotor back plate, has a simple structure, is light in weight, does not form a conductive loop between structural parts, does not generate additional electromagnetic loss, has high motor efficiency, and excellent electromagnetic properties.

[0131] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A disc-type motor rotor, characterized in that, the rotor includes a rotor back plate and a plurality of magnetic elements arranged on the rotor back plate; the rotor back plate includes a silicon steel coil, the silicon steel strips are wound to form an annular silicon steel coil with a multi-layer silicon steel strip structure, one or more silicon steel coil fixing holes are formed on the silicon steel coil, the openings of the silicon steel coil fixing holes are formed on the inner side wall and / or the outer side wall of the ring of the silicon steel coil, the silicon steel coil fixing holes are formed on at least two layers of silicon steel strips of the silicon steel coil, and fixing elements are embedded in the silicon steel coil fixing holes; the main body of the silicon steel coil fixing hole is located in the following area: the plane passing through the central axis of the rotor back plate and the center of gravity of the magnetic element, intersects with the plane of the silicon steel coil for fixing the magnetic element to form an intersection line, taking this intersection line as the axis, the area on the rotor back plate within 55° on both sides of the plane passing through the central axis of the rotor back plate and the center of gravity of the magnetic element; the silicon steel coil fixing holes are arranged along the radial direction of the rotor back plate; the rotor back plate further has a rotary connecting member for connecting the rotor back plate and the motor shaft.

2. The rotor according to claim 1, characterized in that, the silicon steel coil fixing holes are arranged corresponding to the magnetic elements, and the center lines of the silicon steel coil fixing holes are located on the symmetry planes of the corresponding magnetic elements.

3. The rotor according to claim 1, characterized in that, when there are multiple silicon steel coil fixing holes corresponding to the same magnetic element, the multiple silicon steel coil fixing holes are symmetrically arranged in the circumferential direction with respect to the symmetry plane of the corresponding magnetic element, or the center lines of the multiple silicon steel coil fixing holes corresponding to the same magnetic element are all located on the symmetry plane of the corresponding magnetic element.

4. The rotor according to claim 1, characterized in that, the magnetic element is a permanent magnet or a soft magnet.

5. The rotor according to claim 1, characterized in that, the number of silicon steel coil fixing holes is equal to a factor of the number of poles of the rotor, or an integer multiple of a factor of the number of poles.

6. The rotor according to claim 1, characterized in that, when there are multiple silicon steel coil fixing holes, the multiple silicon steel coil fixing holes are evenly distributed in the circumferential direction.

7. The rotor according to claim 1, characterized in that, the silicon steel coil fixing holes are through holes.

8. The rotor according to claim 1, characterized in that, the multi-layer silicon steel strips are bonded to each other by glue.

9. The rotor according to claim 1, characterized in that, the fixing elements are screws or pins.

10. The rotor according to claim 9, characterized in that, the screws are set screws.

11. The rotor according to claim 1, characterized in that, the fixing elements and the hole walls of the silicon steel coil fixing holes are bonded to each other by glue.

12. The rotor according to claim 1, characterized in that, one or more rotary connecting member fixing holes are formed on the rotary connecting member, the rotary connecting member fixing holes correspond to the silicon steel coil fixing holes, and the fixing elements are embedded in the corresponding silicon steel coil fixing holes and the rotary connecting member fixing holes.

13. The rotor according to claim 1, characterized in that, The rotor back plate further has a fixing ring, and the fixing ring is sleeved outside the circular ring of the silicon steel coil and / or is arranged inside the circular ring of the silicon steel coil.

14. The rotor according to claim 1, characterized in that the rotor back plate further has a fixing ring, the fixing ring is sleeved outside the circular ring of the silicon steel coil or is arranged inside the circular ring of the silicon steel coil, and the fixing ring and the rotating connecting member are respectively arranged on different sides of the circular ring of the silicon steel coil.

15. The rotor according to claim 14, characterized in that the fixing ring has one or more fixing ring fixing holes, the fixing ring fixing holes correspond to the silicon steel coil fixing holes and the rotating connecting member fixing holes, and the fixing element is embedded into the corresponding silicon steel coil fixing holes, the rotating connecting member fixing holes and the fixing ring fixing holes.

16. A disc motor, characterized in that the motor includes a rotor according to any one of claims 1-15.

17. The motor according to claim 16, characterized in that the rotor back plate is fixedly connected to the motor shaft.

18. The motor according to claim 17, characterized in that the motor shaft has one or more motor shaft fixing holes, the motor shaft fixing holes correspond to the silicon steel coil fixing holes, and the fixing element is embedded into the corresponding silicon steel coil fixing holes and the motor shaft fixing holes.

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