Rotor punching sheet and motor
By setting multiple spacer slots on the rotor punch of the motor and installing permanent magnets of ferrite material, the problem of demagnetization of neodymium iron boron material at high temperatures is solved, the performance and temperature tolerance of the motor is improved, and the operation of the motor is extended time.
Patent Information
- Application Number
- CN202420971532.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Priority Date
- 2024-01-31
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-07
AI Technical Summary
Neodymium iron boron materials in existing motors are prone to demagnetization at high temperatures, resulting in magnetic field disturbances and motor performance degradation.
Design a rotor punching sheet, by providing a plurality of spaced first and second mounting grooves on the punching sheet body, and installing a second permanent magnet made of ferrite material therein, the number of permanent magnets and magnets are increased. The superposition of inductive lines improves the performance and temperature tolerance of the motor.
It effectively solves the problem of demagnetization of neodymium iron boron materials at high temperatures, improves the speed and performance of the motor, reduces the mass resistance of the permanent magnet, and extends the working time of the motor.
Smart Images
Figure CN222282883U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a rotor punching sheet and a motor. Background Art
[0002] With the continuous development of the new energy vehicle industry, the structure of the rotor of the motor in the car also needs to be continuously improved. In the motor, the magnetic circuit also needs to be optimized to make the motor have better performance. The traditional motor rotor punching, such as the Chinese utility model patent that has been authorized (authorization announcement number: CN 210985764U), discloses a rotor punching and a motor. The rotor punching includes a punching body, a plurality of first magnetic grooves and a plurality of second magnetic grooves. The first magnetic groove includes a first through hole and a second through hole. The first through hole and the second through hole are arranged at intervals, and a first V-shaped structure is formed between the first through hole and the second through hole. The second magnetic groove includes a third through hole and a fourth through hole. The third through hole and the fourth through hole are arranged at intervals, and a second V-shaped structure is formed between the third through hole and the fourth through hole. The openings of the first V-shaped structure and the second V-shaped structure are both facing the outside of the punching body, and the third through hole and the fourth through hole are located between the first through hole and the second through hole along the circumferential direction. According to the rotor punching of the utility model, magnets can be inserted into both the first magnetic slot and the second magnetic slot, so that the force area of the magnets subjected to the centrifugal force is smaller, the tensile stress inside the magnets is reduced, and the service life of the magnets is increased.
[0003] The magnetic steel used in the above-mentioned motors is generally neodymium iron boron material, which is a permanent magnetic material. Due to its high magnetic energy product and good corrosion resistance, it is widely used in motors as a permanent magnet material. Its main function is to generate a magnetic field in the motor, thereby realizing the rotation of the motor. In the motor, neodymium iron boron is usually divided into permanent magnets of different shapes, such as round, square, cylindrical, etc. These permanent magnets are fixed on the rotor of the motor and generate a magnetic field as the motor rotates. The generation of the magnetic field is achieved through the molecular structure of neodymium iron boron. Neodymium iron boron has extremely high magnetic permeability and magnetic toughness, and can generate an extremely strong magnetic field, so that the motor can generate sufficient torque.
[0004] The reason why permanent magnets made of NdFeB materials can generate magnetic fields is that the electrons they carry rotate around atoms in a certain direction, thereby generating a certain magnetic force, which in turn affects the surrounding objects. However, there is a certain temperature limit for electrons to rotate around atoms in a given direction. The upper limit of the working temperature that NdFeB materials can withstand is 80°C, and the upper limit of the working temperature of high-temperature resistant NdFeB is generally 200 degrees Celsius. When the temperature exceeds the upper limit of the working temperature that NdFeB materials can withstand, electrons will deviate from their original orbits and cause chaos. At this time, the local magnetic field of the NdFeB material will be disturbed, resulting in demagnetization. The higher the temperature, the more serious the demagnetization. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide a rotor punching sheet and a motor in view of the current status of the prior art.
[0006] The technical solution adopted by the utility model to solve the above technical problems is: a rotor punching sheet is provided, comprising: a punching sheet body;
[0007] a plurality of first mounting grooves arranged at intervals on the punch body, the plurality of first mounting grooves being distributed at intervals along the circumference of the punch body, the first mounting grooves comprising a first through groove and a second through groove arranged at intervals, a V-shaped structure being formed between the first through groove and the second through groove, and an opening of the V-shaped structure facing the outside of the punch body; and
[0008] A plurality of second mounting grooves are arranged on the punch body at intervals along the circumferential direction of the punch body, each of the first mounting grooves is provided with at least one second mounting groove on both sides along the radial direction of the punch body, the second mounting grooves are continuous through grooves, and the second mounting grooves are arc-shaped structures.
[0009] In the above-mentioned rotor punching sheet, the centers of circles corresponding to the second installation grooves on both sides of each first installation groove are on the same straight line, and the extension line of the straight line passes through the center line of the punching sheet body.
[0010] In the above-mentioned rotor punching sheet, the width of the second mounting grooves on both sides of each first mounting groove, from the center of the punching body to the outside of the punching body along the radial direction of the punching body, and the radius of the whole circle corresponding to the second mounting groove decrease successively.
[0011] In the above-mentioned rotor punching sheet, each of the first mounting grooves has three second mounting grooves on both sides, wherein two of the second mounting grooves are spaced apart and distributed on one side of the first mounting groove toward the center of the punching sheet body, and the other one is distributed on the other side of the first mounting groove.
[0012] In the above-mentioned rotor punching, the number of the first mounting grooves is 6, 8 or 10.
[0013] The utility model solves the above technical problem and further provides a motor, comprising a plurality of the above rotor punching sheets, wherein the plurality of punching sheet bodies are stacked along the thickness direction of the punching sheet body;
[0014] a first permanent magnet made of NdFeB material, the first permanent magnet passing through a plurality of first mounting slots on the punching sheet body along a thickness direction of the punching sheet body; and
[0015] The second permanent magnets are made of ferrite material and the number of the second permanent magnets corresponds to the number of the second installation slots, and the second permanent magnets pass through the second installation slots of the plurality of the punching sheet bodies along the thickness direction of the punching sheet body.
[0016] The utility model solves the above technical problems and further provides a motor, a plurality of the above rotor punching sheets, wherein the plurality of punching sheet bodies are stacked along the thickness direction of the punching sheet body; and
[0017] A second permanent magnet is made of ferrite material, and the second permanent magnet passes through the first mounting grooves and the second mounting grooves on the plurality of punching sheet bodies along the thickness direction of the punching sheet body.
[0018] Compared with the prior art, the advantage of the utility model lies in that a plurality of first mounting grooves and second mounting grooves which are spaced apart from each other are arranged on the punching sheet body, and a second permanent magnet made of ferrite is installed in the second mounting groove, so as to solve the problem that the local magnetic field of the neodymium iron boron material may be disturbed and cause demagnetization, and increase the number of permanent magnets installed on the punching sheet bodies after they are stacked, thereby improving the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a plan view of the local structure of the rotor punching of this scheme.
[0020] In the figure, 1, punch body; 2, first mounting groove; 3, first through groove; 4, second through groove; 5, second mounting groove. DETAILED DESCRIPTION
[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0022] The present invention provides a rotor punching, which is used in a motor. When installed, the rotor punchings are stacked along their own thickness direction to form a rotor core of the motor. The motor can be used in new energy vehicles. The rotor punching of the present invention adds a second installation groove for installing a second permanent magnet on the basis of a traditional rotor punching, so as to solve the problem of demagnetization of the existing permanent magnet under high temperature conditions. In this way, the motor can have a higher speed and better performance.
[0023] like Figure 1 As shown, a rotor punching sheet of the present solution includes: a punching sheet body 1, a plurality of first mounting grooves 2 and a plurality of second mounting grooves 5.
[0024] Specifically, multiple first mounting grooves 2 and multiple second mounting grooves 5 are distributed on the punch body 1 at intervals. The punch body 1 is roughly circular in structure. The thickness of a single punch body 1 is roughly 0.3 mm to 0.5 mm. The thickness direction of the punch body 1 is arranged parallel to the axial direction of the punch body 1. Multiple first mounting grooves 2 and multiple second mounting grooves 5 are all arranged on the punch body 1 at intervals around the axial direction of the punch body 1. Each first mounting groove 2 is provided with at least one second mounting groove 5 on both sides of the radial direction of the punch body 1. When multiple punch bodies 1 are stacked, the multiple first mounting grooves 2 on the multiple punch bodies 1 correspond one by one, and the multiple second mounting grooves 5 also correspond one by one.
[0025] When assembling the motor, the first permanent magnet made of NdFeB material passes through the first mounting grooves 2 of the plurality of lamination bodies 1 along the axial direction of the lamination body 1, and the second permanent magnet made of ferrite material passes through the second mounting grooves 5 of the plurality of lamination bodies 1 along the axial direction of the lamination body 1. Of course, the permanent magnets passing through the first mounting grooves 2 and the second mounting grooves 5 can also be made of ferrite material. During operation, since the second mounting grooves 5 are provided on the lamination body 1, the motor rotor formed by stacking the lamination bodies 1 can install more permanent magnets, thereby increasing the magnetic properties of the rotor assembly. , and the increase of permanent magnets can also increase the magnetic flux lines in the same direction on the rotor assembly, so that the number of conductors involved in cutting the magnetic flux lines will increase, and the final Lorentz magnetic force will be stronger. The upper limit of the working temperature of ferrite is generally 250°C. Compared with NdFeB materials, ferrite materials have better heat resistance and can withstand the higher temperature caused by the excessive speed of the motor when working. After adding the second permanent magnet made of ferrite, it can temporarily approach the limit temperature without causing all permanent magnets to demagnetize immediately, causing the motor to stall or even stop, thereby increasing the upper limit of the motor speed design. In addition, compared with NdFeB materials, the density of ferrite materials is smaller. Under the same volume, the permanent magnet made of ferrite materials has a lighter weight, so when the second permanent magnet made of ferrite materials is installed in the first installation slot 2 and the second installation slot 5 at the same time, the side effect of the mass resistance brought by the second permanent magnet itself can be reduced.
[0026] In the design process of permanent magnets, the V-shape of permanent magnets is the most direct direction of magnetic flux density and magnetic path. The purpose is to generate an induced electromotive force that is closer to a sine wave (permanent magnet synchronous motor requires sine wave drive) and at the same time reduce the harmonic noise of the motor to a certain extent. Therefore, the first mounting groove 2 is set to a V shape to improve the performance of the motor. Theoretically, the second mounting groove 5 can also be set to a V shape, but setting the second mounting groove 5 to a V shape will easily make the first mounting groove 2 and the second mounting groove 5 form a "<<<" shape. This shape will first affect the appearance of the punching body 1. Secondly, such a design will make the arrangement of the magnetic flux lines emitted by the first permanent magnet and the second permanent magnet too regular. The magnetic flux lines of the latter permanent magnet are easily absorbed by the former permanent magnet, and the purpose of increasing the magnetic flux lines by superimposing permanent magnets cannot be achieved. Moreover, the magnetic energy product of the second permanent magnet made of ferrite material itself is much smaller than that of the first permanent magnet made of neodymium iron boron material. If a full V structure is adopted, the lifting property of the motor will be very small. Setting the second mounting groove 5 to an arc structure can complete the circuit by taking other magnetic circuits while avoiding the main V-shaped magnetic circuit, so that when the permanent magnets are superimposed, the magnetic flux lines are also superimposed.
[0027] In an AC motor or generator, the motor speed is related to the frequency and the number of pole pairs. The speed calculation formula is: speed (n) = 60x frequency (f) / pole pair (p). Frequency refers to the number of cycles of AC power, usually in Hertz (Hz). The number of pole pairs refers to the number of magnetic poles in the motor or generator (that is, the number of first mounting slots 2 in this solution). The smaller the pole pair as the denominator, the higher the speed. The larger the pole pair, the greater the motor torque. The pole pair number of a traditional motor is generally 6, 8 or 10. The first mounting slot 2 has a first through slot 3 and a second through slot 4 that are spaced apart. A V-shaped structure is formed between the first through slot 3 and the second through slot 4. The opening of the V-shaped structure faces the outside of the punch body 1. The second mounting slot 5 is a continuous through slot.
[0028] Furthermore, in order to ensure that the magnetic flux lines emitted by the first permanent magnet and the second permanent magnet installed in the first mounting groove 2 and the second mounting groove 5 can be better superimposed, the center of the circle corresponding to the second mounting groove 5 on both sides of each first mounting groove 2 is on the same straight line, and the extension line of the straight line passes through the center line of the punch body 1. The second mounting groove 5 on both sides of each first mounting groove 2, along the radial direction of the punch body 1, the width from the center of the punch body 1 to the outside of the punch body 1, and the radius of the whole circle corresponding to the second mounting groove 5 decrease successively.
[0029] As a preferred solution for the rotor punching sheet, each first mounting groove 2 has three second mounting grooves 5 on both sides, wherein two second mounting grooves 5 are spaced apart and distributed on one side of the first mounting groove 2 toward the center of the punching sheet body 1 , and the other one is distributed on the other side of the first mounting groove 2 .
[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0031] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the scope defined by the spirit of the present invention.
Claims
1. A rotor punching, characterized in that: include: Film processing body; a plurality of first mounting grooves arranged at intervals on the punch body, the plurality of first mounting grooves being distributed at intervals along the circumference of the punch body, the first mounting grooves comprising a first through groove and a second through groove arranged at intervals, a V-shaped structure being formed between the first through groove and the second through groove, and an opening of the V-shaped structure facing the outside of the punch body; and A plurality of second mounting grooves are arranged on the punch body at intervals along the circumferential direction of the punch body, each of the first mounting grooves is provided with at least one second mounting groove on both sides along the radial direction of the punch body, the second mounting grooves are continuous through grooves, and the second mounting grooves are arc-shaped structures.
2. A rotor punching sheet according to claim 1, characterized in that: The centers of circles corresponding to the second installation grooves on both sides of each first installation groove are located on the same straight line, and an extension line of the straight line passes through the center line of the punch body.
3. A rotor punching sheet according to claim 1, characterized in that: The width of the second mounting grooves on both sides of each first mounting groove, from the center of the punch body to the outside of the punch body along the radial direction of the punch body, and the radius of the whole circle corresponding to the second mounting groove decrease successively.
4. A rotor punching sheet according to claim 1, characterized in that: Each of the first mounting grooves has three second mounting grooves on both sides, wherein two of the second mounting grooves are spaced apart and distributed on one side of the first mounting groove toward the center of the punch body, and the other one is distributed on the other side of the first mounting groove.
5. A rotor punching sheet according to claim 1, characterized in that: The number of the first installation slots is 6, 8 or 10.
6. A motor, characterized in that: include: A plurality of rotor punching sheets according to any one of claims 1 to 5, wherein a plurality of the punching sheet bodies are stacked along the thickness direction of the punching sheet bodies; a first permanent magnet made of NdFeB material, the first permanent magnet passing through a plurality of first mounting slots on the punching sheet body along a thickness direction of the punching sheet body; and The second permanent magnets are made of ferrite material and the number of the second permanent magnets corresponds to the number of the second installation slots, and the second permanent magnets pass through the second installation slots of the plurality of the punching sheet bodies along the thickness direction of the punching sheet body.
7. A motor, characterized in that: include: A plurality of rotor punching sheets according to any one of claims 1 to 5, wherein a plurality of the punching sheet bodies are stacked along the thickness direction of the punching sheet bodies; A second permanent magnet is made of ferrite material, and the second permanent magnet passes through the first mounting grooves and the second mounting grooves on the plurality of punching sheet bodies along the thickness direction of the punching sheet body.