Rotor magnetic ring and frameless motor

Abstract

The utility model discloses a rotor magnetic ring and a frameless motor, the rotor magnetic ring comprises m magnetic circuit splicing blocks which are annularly and sequentially spliced, the m magnetic circuit splicing blocks are divided into n first splicing blocks, each first splicing block is provided with a first inner cambered surface and a first outer cambered surface, and the chord length of the first outer cambered surface is greater than that of the first inner cambered surface; each second splicing block is provided with a second inner cambered surface and a second outer cambered surface, the chord length of each second outer cambered surface is smaller than that of each second inner cambered surface, and m is larger than or equal to 2 and equal to 2n; the side waists of the first splicing blocks abut against the side waists of the second splicing blocks, and the first splicing blocks and the second splicing blocks are arranged in a staggered mode in the circumferential direction. When the rotor magnetic ring is applied to the frameless motor, a magnetic conductive ring is equivalently canceled, so that the overall size of the frameless motor is obviously reduced, and the difficulty of manually assembling the frameless motor is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of frameless motors, in particular to a rotor magnetic ring and a frameless motor. Background Art

[0002] Frameless motors are a type of energy-saving and environmentally friendly motors with great development potential and application prospects. They have diverse topological structures and a wide range of applications. They have many advantages such as small size, light weight, high power density, high torque density, high efficiency, low heat generation, small torque fluctuation, low cogging torque, and large rotor inner diameter. They have been increasingly widely used in application scenarios in industries such as collaborative robots, humanoid robots, quadruped robots, medical surgery and rehabilitation robots.

[0003] The frameless motor includes a rotor magnetic ring and an annular iron core 1 (refer to Figure 1 ), the annular core ring is arranged on the outer periphery of the rotor magnetic ring to serve as the stator of the frameless motor; wherein, the rotor magnetic ring includes a magnetic conductive ring 3 and a tile-shaped magnetic steel 2 with a set pole arc coefficient and an eccentricity, and the tile-shaped magnetic steel 2 is usually arranged on the outer periphery of the magnetic conductive ring 3 in a surface-mounted manner to serve as the rotor of the frameless motor.

[0004] However, the surface mounting method for fixing the tile-shaped magnetic steel 2 requires the installation of a magnetic conductive ring, which increases the cost of the motor, and both the magnetic conductive ring and the tile-shaped magnetic steel need to occupy a certain space, resulting in a larger overall size of the frameless motor. Utility Model Content

[0005] The utility model provides a rotor magnetic ring and a frameless motor, aiming to solve the problems of high cost and large size in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a rotor magnetic ring, wherein the rotor magnetic ring comprises m magnetic circuit splicing blocks spliced ​​in sequence in a ring shape, and the m magnetic circuit splicing blocks are divided into:

[0007] n first splicing blocks, each of which has a first inner curved surface and a first outer curved surface, and a chord length of the first outer curved surface is greater than a chord length of the first inner curved surface;

[0008] n second splicing blocks, each of which has a second inner curved surface and a second outer curved surface, a chord length of the second outer curved surface is smaller than a chord length of the second inner curved surface, m≥2 and m=2n;

[0009] The first assembling block and the second assembling block are in contact with each other at their side waists, and the first assembling block and the second assembling block are alternately arranged in the circumferential direction.

[0010] According to some embodiments of the present utility model, along the circumferential direction of the rotor magnetic ring, the magnetic circuit splicing blocks of the rotor magnetic ring are divided into one splicing block group or are sequentially divided into multiple splicing block groups;

[0011] Each of the splicing block groups includes four magnetic circuit splicing blocks spliced ​​in sequence, which are divided into an inner magnetizing splicing block, a forward magnetic guiding splicing block, an outer magnetizing splicing block, and a reverse magnetic guiding splicing block, wherein:

[0012] The inner magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially inwards;

[0013] The forward magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the forward direction toward the outer magnetized splicing block;

[0014] The external magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially outward;

[0015] The reverse magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the reverse direction toward the outer magnetized splicing block.

[0016] According to some embodiments of the utility model, the forward magnetic conductive splicing block and the reverse magnetic conductive splicing block are both made of permanent magnetic material, the forward magnetic conductive splicing block is divided into S pole and N pole along its radial direction, and the reverse magnetic conductive splicing block is divided into N pole and S pole along its radial direction.

[0017] According to some embodiments of the present utility model, the angle between the side waist of each magnetic circuit splicing block and the chord corresponding to the longer arc surface is α, wherein:

[0018] α=(2Π / LCM(Z, 2p))×GCD(Z, 2p)×p), where Z is the number of slots, 2P is the number of series, LCM is the least common multiple of the number of slots and the number of series, GCD is the greatest common divisor of the number of slots and the number of series, and P is the number of poles, which is half of the number of series.

[0019] According to some embodiments of the present invention, the angle α between the side waist of each magnetic circuit splicing block and the chord corresponding to the longer arc surface is set to 30 degrees or 60 degrees.

[0020] According to some embodiments of the present utility model, along the circumferential direction of the rotor magnetic ring, the magnetic circuit splicing blocks of the rotor magnetic ring are divided into one splicing block group or are sequentially divided into multiple splicing block groups;

[0021] Each of the splicing block groups includes a plurality of sequentially spliced ​​magnetic circuit splicing blocks, which are sequentially divided into an inner magnetizing splicing block, at least two sequentially spliced ​​forward magnetic guiding splicing blocks, an outer magnetizing splicing block, and at least two sequentially spliced ​​reverse magnetic guiding splicing blocks, wherein:

[0022] The inner magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially inwards;

[0023] The forward magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the forward direction toward the outer magnetized splicing block;

[0024] The external magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially outward;

[0025] The reverse magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the reverse direction toward the outer magnetized splicing block.

[0026] According to some embodiments of the present invention, it is characterized in that at least part of the first splicing blocks are the internally magnetized splicing blocks, and another part of the first splicing blocks are the externally magnetized splicing blocks;

[0027] And / or, at least part of the second splicing blocks are the forward magnetic conductive splicing blocks, and another part of the second splicing blocks are the reverse magnetic conductive splicing blocks.

[0028] According to some embodiments of the present invention, the number of the splicing block groups is set to be equal to the number of winding slots of the iron core.

[0029] According to some embodiments of the utility model, along the radial direction of the rotor magnetic ring, the first splicing block and the second splicing block are arranged at the same height, the inner arc surface of the first splicing block and the inner arc surface of the second splicing block are arranged cocircularly, and the outer arc surface of the first splicing block and the outer arc surface of the second splicing block are arranged cocircularly.

[0030] In a second aspect, an embodiment of the present application provides a frameless motor, comprising:

[0031] A rotor magnetic ring as mentioned above;

[0032] The iron core is arranged on the outer periphery of the rotor magnetic ring.

[0033] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0034] 1. When the rotor magnetic ring is applied to the frameless motor, it is equivalent to canceling the magnetic ring. Therefore, the rotor magnetic ring occupies a smaller space, thereby saving the space occupied by the rotor magnetic ring, and further significantly reducing the overall size of the frameless motor. With this arrangement, when the frameless motor is assembled in the installation space of the device, a larger operating space can be reserved, so the difficulty of manually assembling the frameless motor is reduced. In addition, when the rotor magnetic ring is applied to the frameless motor, it is equivalent to canceling the magnetic ring, which also reduces the material cost.

[0035] 2. Some magnetic circuit blocks adopt the structure of the first block, and the other magnetic circuit blocks adopt the structure of the second block, that is, the first block and the second block adopt the structure of the inner and outer trapezoids respectively. Therefore, the first block and the second block are arranged in sequence along the circumferential direction, the first block and the second block are alternately matched and constrained to each other, and the rotor magnetic ring has a good structural strength, thereby ensuring that the rotor magnetic ring is not easily damaged during rotation, thereby ensuring the stability of the rotor during rotation, and the frameless motor can stably output power to the outside.

[0036] 3. The first splicing block and the second splicing block respectively adopt the structure of inner and outer trapezoids. The first splicing block and the second splicing block are alternately matched and constrained to each other. Therefore, n first splicing blocks and n second splicing blocks can be directly spliced ​​into a rotor magnetic ring with a stable structure, without filling glue between the first splicing block and the second splicing block; of course, in order to further ensure the structural strength of the rotor magnetic ring, glue can also be filled between the first splicing block and the second splicing block.

[0037] 4. The first splicing block and the second splicing block respectively adopt the structure of inner and outer trapezoids. The first splicing block and the second splicing block are alternately matched and constrained to each other. The first splicing block and the second splicing block have good assembly accuracy, which improves the positioning accuracy of the magnetic poles of the rotor magnetic ring and reduces the deviation between theoretical simulation and actual process, thereby reducing the cogging torque and ensuring the output force of the frameless motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a partial structural schematic diagram of a frameless motor in the prior art;

[0039] Figure 2 This is a partial structural schematic diagram of the rotor magnetic ring in an embodiment of the present application;

[0040] Figure 3 Schematic diagram showing the magnetization direction of the rotor magnetic ring in the embodiment of the present application;

[0041] Figure 4 This is a schematic diagram of the magnetic pole structure of the rotor magnetic ring in the embodiment of the present application;

[0042] Figure 5 This is a schematic diagram of the assembly structure of the frameless rotor magnetic ring and the iron core in an embodiment of the present application;

[0043] Figure 6 for Figure 5 Schematic diagram of the structure of the middle part;

[0044] Figure 7 This is a diagram showing an implementation of a magnetic circuit of a frameless motor in an embodiment of the present application;

[0045] Figure 8This is another magnetic circuit display implementation diagram of the frameless motor in the embodiment of the present application.

[0046] The meanings of the reference numerals are as follows:

[0047] 1. Ring core; 2. Tile-shaped magnetic steel; 3. Magnetic conductive ring; 4. Forward magnetic conductive splicing block; 5. Externally magnetized splicing block; 6. Reverse magnetic conductive splicing block; 7. Internally magnetized splicing block; 8. Rotor magnetic ring; 81. First splicing block; 811. First inner arc surface; 812. First outer arc surface; 82. Second splicing block; 821. Second inner arc surface; 822. Second outer arc surface; 9. Iron core. DETAILED DESCRIPTION

[0048] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0051] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0052] See also Figures 2 to 4 , a rotor magnetic ring 8 is provided for an embodiment of the utility model, the rotor magnetic ring 8 comprises m magnetic circuit splicing blocks, the m magnetic circuit splicing blocks are spliced ​​and connected in sequence in a ring shape, that is, the m magnetic circuit splicing blocks are spliced ​​in sequence into a ring shape, so as to obtain the rotor magnetic ring 8, m≥2. Among them, at least part of the magnetic circuit splicing blocks are made of permanent magnetic material, and the part of the magnetic circuit splicing blocks includes magnetic circuit splicing blocks that are magnetized radially inward and magnetic circuit splicing blocks that are magnetized radially outward, that is, the m magnetic circuit splicing blocks include a part of the magnetic circuit splicing blocks made of permanent magnetic material, and the part of the magnetic circuit splicing blocks is used for magnetizing radially inward, and the m magnetic circuit splicing blocks include a part of the magnetic circuit splicing blocks made of permanent magnetic material, and the part of the magnetic circuit splicing blocks is used for magnetizing radially outward.

[0053] Furthermore, the m magnetic circuit splicing blocks are divided into n first splicing blocks 81 and n second splicing blocks 82, m=2n, that is, the first splicing blocks 81 and the second splicing blocks 82 are arranged in equal numbers, and no less than two of them. Among them, the first splicing block 81 has a first inner arc surface 811 and a first outer arc surface 812, and the chord length of the first outer arc surface 812 is greater than the chord length of the first inner arc surface 811; the second splicing block 82 has a second inner arc surface 821 and a second outer arc surface 822, and the chord length of the second outer arc surface 822 is less than the chord length of the second inner arc surface 821. Among them, the side waists of the first splicing block 81 and the second splicing block 82 are abutted, and the first splicing block 81 and the second splicing block 82 are staggered in the circumferential direction. More specifically, each first splicing block 81 is spliced ​​between two second splicing blocks 82, and each second splicing block 82 is spliced ​​between two first splicing blocks 81.

[0054] Among them, at least part of the first splicing block 81 and / or the second splicing block 82 is used for radially inward magnetization, and at least part of the first splicing block 81 and / or the second splicing block 82 is used for radially outward magnetization, which is not limited in the present application.

[0055] Specifically, when the rotor magnetic ring 8 is used in a frameless motor, the rotor magnetic ring 8 has a part of magnetic circuit splicing blocks for magnetizing radially inward, and the rotor magnetic ring 8 also has a part of magnetic circuit splicing blocks for magnetizing radially outward, and the two parts of magnetic circuit splicing blocks are used to replace the tile-shaped magnetic steel 2. The magnetic circuit splicing blocks are spliced ​​into a ring shape, and thus, the other part of the magnetic circuit splicing blocks are used to replace the magnetic conductive ring 3, and are used to guide the magnetic field in the circumferential direction, that is, to guide the magnetic field from the latter part of the magnetic circuit splicing blocks (for magnetizing radially inward) to the former part of the magnetic circuit splicing blocks (for magnetizing radially outward). Therefore, when the rotor magnetic ring 8 of the present application is used in a frameless motor, the rotor magnetic ring 8 can form a magnetic circuit with the winding on the external iron core 9, thereby generating a driving force to rotate the rotor magnetic ring 8, which is not described in detail.

[0056] It is understandable that when the rotor magnetic ring 8 is applied to the frameless motor, it is equivalent to canceling the magnetic ring 3. Therefore, the space occupied by the rotor magnetic ring 8 is small, thereby saving the space occupied by the rotor magnetic ring 8, and further significantly reducing the overall size of the frameless motor. With this arrangement, when the frameless motor is assembled in the installation space of the device, a larger operating space can be reserved, so the difficulty of manually assembling the frameless motor is reduced. In addition, when the rotor magnetic ring 8 is applied to the frameless motor, it is equivalent to canceling the magnetic ring 3, which also reduces the material cost.

[0057] In addition, some magnetic circuit splicing blocks adopt the structural form of the first splicing block 81, and the other part of the magnetic circuit splicing blocks adopt the structural form of the second splicing block 82, that is, the first splicing block 81 and the second splicing block 82 respectively adopt the structural form of the inner and outer trapezoids. Therefore, the first splicing block 81 and the second splicing block 82 are arranged in sequence along the circumferential direction, the first splicing block 81 and the second splicing block 82 are alternately matched and constrained to each other, and the rotor magnetic ring 8 has a good structural strength, thereby ensuring that the rotor magnetic ring 8 is not easily damaged during rotation, thereby ensuring the stability of the rotor during rotation, and the frameless motor can stably output power to the outside.

[0058] Moreover, the first splicing block 81 and the second splicing block 82 respectively adopt the structural form of inner and outer trapezoids, and the first splicing block 81 and the second splicing block 82 are alternately matched and constrained to each other. Therefore, n first splicing blocks 81 and n second splicing blocks 82 can be directly spliced ​​into a rotor magnetic ring 8 with a stable structure, and there is no need to fill glue between the first splicing block 81 and the second splicing block 82; of course, in order to further ensure the structural strength of the rotor magnetic ring 8, glue can also be filled between the first splicing block 81 and the second splicing block 82.

[0059] In addition, the first splicing block 81 and the second splicing block 82 respectively adopt the structural form of inner and outer trapezoids. The first splicing block 81 and the second splicing block 82 are alternately matched and constrained to each other. The first splicing block 81 and the second splicing block 82 have good assembly accuracy, which improves the positioning accuracy of the magnetic poles of the rotor magnetic ring 8 and reduces the deviation between theoretical simulation and actual process, thereby reducing the cogging torque and ensuring the output force of the frameless motor.

[0060] In one possible embodiment, four magnetic circuit splicing blocks constitute one splicing block group. If the rotor magnetic ring 8 includes four magnetic circuit splicing block groups, then along the circumferential direction of the rotor magnetic ring 8, the magnetic circuit splicing blocks of the rotor magnetic ring 8 are just one splicing block group; of course, if the rotor magnetic ring 8 includes 8, 12, 16┈4x splicing blocks, X is greater than or equal to 2, then along the circumferential direction of the rotor magnetic ring 8, the magnetic circuit splicing blocks of the rotor magnetic ring 8 are sequentially divided into at least two splicing block groups.

[0061] Specifically, the four magnetic circuit splicing blocks of each splicing block group are divided into an inner magnetizing splicing block 7, a forward magnetizing splicing block 4, an outer magnetizing splicing block 5, and a reverse magnetizing splicing block 6, wherein:

[0062] The inner magnetized splicing block 7 is made of permanent magnetic material, the outer end of the inner magnetized splicing block 7 is an S pole, and the inner end is an N pole. Therefore, the inner magnetized splicing block 7 is a magnetic circuit splicing block for radially inward magnetization.

[0063] The forward magnetic conductive splicing block 4 is a magnetic circuit splicing block used to conduct magnetism from the inner magnetized splicing block 7 toward the outer magnetized splicing block 5 in the forward direction. That is, the forward magnetic conductive splicing block 4 conducts magnetism in the clockwise direction along the circumferential direction of the rotor magnetic ring to realize the flow of the magnetic field from the inner magnetized splicing block 7 to the outer magnetized splicing block 5.

[0064] The external magnetizing splicing block 5 is made of permanent magnetic material, the outer end of the external magnetizing splicing block 5 is an N pole, and the outer end is an S pole. Therefore, the external magnetizing splicing block 5 is a magnetic circuit splicing block for radially inward magnetization.

[0065] The reverse magnetic conductive splicing block 6 is a magnetic circuit splicing block used to conduct magnetism from the inner magnetized splicing block 7 in the reverse direction toward the outer magnetized splicing block 5, that is, the reverse magnetic conductive splicing block 6 conducts magnetism in the counterclockwise direction along the circumferential direction of the rotor magnetic ring to realize the flow of the magnetic field from the inner magnetized splicing block 7 to the outer magnetized splicing block 5.

[0066] It can be understood that the inner magnetizing splicing block 7, the forward magnetizing splicing block 4 and the outer magnetizing splicing block 5 can form a magnetic circuit, and the inner magnetizing splicing block 7, the reverse magnetizing splicing block 6 and the outer magnetizing splicing block 5 can also form a magnetic circuit. It can be seen that the two magnetic circuits can share the inner magnetizing splicing block 7 and the outer magnetizing splicing block 5. Among them, only one magnetic splicing block (the forward magnetizing splicing block 4 or the reverse magnetizing splicing block 6) is arranged between the inner magnetizing splicing block 7 and the forward magnetizing splicing block 4 for guiding the magnetic field. In this way, one magnetic splicing block can effectively guide the magnetic field from the inner magnetizing splicing block 7 to the outer magnetizing splicing block 5.

[0067] In some embodiments, the forward magnetic conductive splicing block 4 is made of permanent magnetic material, and the reverse magnetic conductive splicing block 6 is made of permanent magnetic material. With this arrangement, the magnetic resistance coefficient of the forward magnetic conductive splicing block 4 and the reverse magnetic conductive splicing block 6 is smaller than that of the magnetic conductive material. Under the same size, the rotor magnetic ring 8 can output a larger torque.

[0068] Among them, only one magnetic conductive splicing block (forward magnetic conductive splicing block 4 or reverse magnetic conductive splicing block 6) is arranged between the inner magnetizing splicing block 7 and the outer magnetizing splicing block. The forward magnetic conductive splicing block 4 and the reverse magnetic conductive splicing block 6 provide the main magnetic circuit magnetic field. In this way, one magnetic conductive splicing block can effectively guide the magnetic field from the inner magnetizing splicing block 7 to the outer magnetizing splicing block 5. The controllability of the magnetic field is better, the risk of magnetic leakage is reduced, and the implementation cost is low.

[0069] In addition, the inner magnetized splicing block 7, the magnetic conductive splicing block (forward magnetic conductive splicing block 4 or reverse magnetic conductive splicing block 6) and the outer magnetized splicing block 5 form a V-shaped magnetic circuit. With this arrangement, the rotor magnetic ring 8 has a better magnetic concentration effect, which effectively improves the power density and torque density of the frameless motor, while reducing the presence of the magnetic conductive ring 3, effectively reducing the material cost.

[0070] In a further embodiment, the forward magnetic conductive splicing block 4 is divided into an S pole and an N pole along its radial direction, that is, the side of the forward magnetic conductive splicing block 4 close to the inner magnetized splicing block 7 is an S pole, and the side of the forward magnetic conductive splicing block 4 close to the outer magnetized splicing block 5 is an N pole; similarly, the reverse magnetic conductive splicing block 6 is divided into an N pole and an S pole along its radial direction, that is, the side of the reverse magnetic conductive splicing block 6 close to the inner magnetized splicing block 7 is an S pole, and the side of the reverse magnetic conductive splicing block 6 close to the outer magnetized splicing block 5 is an N pole. It can be understood that the forward magnetic conductive splicing block 4 and the reverse magnetic conductive splicing block 6 adopt the above-mentioned structural form, and the forward magnetic conductive splicing block 4 and the reverse magnetic conductive splicing block 6 can conduct magnetism laterally, so that the magnetic field can be effectively guided from the inner magnetized splicing block 7 to the outer magnetized splicing block 5, and the risk of magnetic leakage can be reduced, and the feasibility of the scheme is strong.

[0071] Instead of the forward magnetic conductive splicing block 4 or the reverse magnetic conductive splicing block 6 being made of permanent magnetic material, in another possible embodiment, the inner magnetized splicing block 7 and the forward magnetic conductive splicing block 4 are made of magnetic conductive material to guide the magnetic field from the inner magnetized splicing block 7 to the outer magnetized splicing block 5.

[0072] In some embodiments, at least part of the first splicing block 81 is an inner magnetizing splicing block 7, and another part of the first splicing block 81 is an outer magnetizing splicing block 5. It can be understood that the inner magnetizing splicing block 7 and the outer magnetizing splicing block 5 adopt the structural form of the first splicing block 81, and the inner magnetizing splicing block 7 and the outer magnetizing splicing block 5 can effectively guide the magnetic field in the radial direction to reduce the risk of magnetic leakage.

[0073] In some embodiments, reference Figure 6 At least part of the second splicing block 82 is a forward magnetic conductive splicing block 4, and another part of the second splicing block 82 is a reverse magnetic conductive splicing block 6. It can be understood that the forward magnetic conductive splicing block 4 and the reverse magnetic conductive splicing block 6 adopt the structural form of the second splicing block 82, and the forward magnetic conductive splicing block 4 and the reverse magnetic conductive splicing block 6 can effectively guide the magnetic field in the lateral direction to reduce the risk of magnetic leakage.

[0074] In some embodiments, reference Figure 6 The angle between the side waist of each magnetic circuit splicing block and the chord corresponding to the longer arc surface is α, where: α=(2Π / LCM(Z, 2p))×GCD(Z, 2p)×p), where Z is the number of slots, 2P is the number of series, LCM is the least common multiple of the number of slots and the number of series, GCD is the greatest common divisor of the number of slots and the number of series, and P is the number of poles, which is half of the number of series.

[0075] The included angle α between the side waist of each magnetic circuit splicing block and the chord corresponding to the longer arc surface is usually set at 30 degrees, 60 degrees or other angles, that is, it satisfies the above calculation formula.

[0076] It can be understood that the angle α between the side waist of the magnetic circuit splicing block and the chord corresponding to the longer arc surface is selected and calculated using the above formula. The advantage of the magnetic circuit splicing block in matching can better improve the position accuracy of the rotor magnetic pole, reduce the torque of the tooth slot, and improve the structural strength of the rotor magnetic ring 8. Figure 7 If the matching accuracy of the magnetic circuit splicing blocks is poor, the magnetic field is dispersed, which can easily lead to more messy and invalid magnetic fields; refer to Figure 8 If the angle α is selected as the above-mentioned adaptation angle, the magnetic field is more concentrated on the magnetic circuit, which can effectively reduce the chaotic and invalid magnetic field, thereby reducing the torque of the tooth slot.

[0077] Instead of adopting the above structure for the rotor magnetic ring 8, in other possible embodiments, along the circumferential direction of the rotor magnetic ring 8, the magnetic circuit splicing blocks of the rotor magnetic ring 8 are just one splicing block group; or, along the circumferential direction of the rotor magnetic ring 8, the rotor magnetic ring 8 is divided into a plurality of splicing block groups in sequence. Among them, each splicing block group includes a plurality of magnetic circuit splicing blocks spliced ​​in sequence, which are divided into an inner magnetizing splicing block 7, at least two forward magnetizing splicing blocks 4 spliced ​​in sequence, an outer magnetizing splicing block 5, and at least two reverse magnetizing splicing blocks 6 spliced ​​in sequence, wherein: the inner magnetizing splicing block 7 is made of permanent magnetic material, and is a magnetic circuit splicing block for radially inward magnetization; the forward magnetizing splicing block 4 is made of permanent magnetic material or magnetic conductive material, and is a magnetic circuit splicing block for magnetizing from the inner magnetizing splicing block 7 in the positive direction toward the outer magnetizing splicing block 5, that is, the forward magnetizing splicing block 4 is along The rotor magnetic ring conducts magnetism in the clockwise direction in the circumferential direction to realize the magnetic field flowing from the inner magnetized splicing block 7 to the outer magnetized splicing block 5; the outer magnetized splicing block 5 is made of permanent magnetic material, and is a magnetic circuit splicing block used for radially outward magnetization; the reverse magnetic conductive splicing block 6 is made of permanent magnetic material or magnetic conductive material, and is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block 7 in the reverse direction toward the outer magnetized splicing block 5, that is, the reverse magnetic conductive splicing block 6 conducts magnetism along the rotor magnetic ring in the counterclockwise direction in the circumferential direction to realize the magnetic field flowing from the inner magnetized splicing block 7 to the outer magnetized splicing block 5.

[0078] More specifically, instead of setting a magnetic conductive splicing block (forward magnetic conductive splicing block 4 or reverse magnetic conductive splicing block 6) between the inner magnetizing splicing block 7 and the outer magnetizing splicing block 5, two or more magnetic conductive splicing blocks are set between the inner magnetizing splicing block 7 and the outer magnetizing splicing block 5, and the multiple magnetic conductive splicing blocks cooperate to guide the magnetic field from the inner magnetizing splicing block 7 toward the outer magnetizing splicing block 5.

[0079] In some embodiments, reference Figure 2 and Figure 3Along the radial direction of the rotor magnetic ring 8, the first splicing block 81 and the second splicing block 82 are arranged at the same height, the side waists of the first splicing block 81 and the second splicing block 82 match, the outer arc surface of the first splicing block 81 and the outer arc surface of the second splicing block 82 are arranged cocircularly, and the inner arc surface of the first splicing block 81 and the inner arc surface of the second splicing block 82 are arranged cocircularly, thereby, n first splicing blocks 81 and n second splicing blocks 82 are just spliced ​​into a rotor magnetic ring 8 with smooth inner and outer peripheral surfaces, so that it can be more conveniently used as a rotor of a frameless motor.

[0080] In some embodiments, reference Figure 5 and Figure 6 The magnetic circuit splicing blocks of the rotor magnetic ring 8 are divided into several splicing block groups, as described above. The number of splicing block groups is set according to the number of winding slots of the iron core, so that during the rotation of the rotor magnetic ring 8, the position of each winding slot can form a magnetic circuit to provide a rotational force for the rotor magnetic ring 8.

[0081] The present application discloses a frameless motor, referring to Figure 5 and Figure 6 , including the above-mentioned rotor magnetic ring 8 and iron core 9, the iron core 9 is provided with multiple, the multiple iron cores 9 are spliced ​​in sequence in a ring shape, and are arranged around the outer periphery of the rotor magnetic ring 8.

[0082] It is understandable that the frameless motor adopts the above-mentioned rotor magnetic ring 8, which is equivalent to canceling the magnetic conductive ring 3. Therefore, the rotor magnetic ring 8 occupies a smaller space, thereby saving the space occupied by the rotor magnetic ring, and further significantly reducing the overall size of the frameless motor.

[0083] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A rotor magnetic ring, characterized in that: The rotor magnetic ring includes m magnetic circuit splicing blocks spliced ​​in sequence in a ring shape, and the m magnetic circuit splicing blocks are divided into: n first splicing blocks, each of which has a first inner curved surface and a first outer curved surface, and a chord length of the first outer curved surface is greater than a chord length of the first inner curved surface; n second splicing blocks, each of which has a second inner curved surface and a second outer curved surface, a chord length of the second outer curved surface is smaller than a chord length of the second inner curved surface, m≥2 and m=2n; The first assembling block and the second assembling block are in contact with each other at their side waists, and the first assembling block and the second assembling block are alternately arranged in the circumferential direction.

2. A rotor magnetic ring according to claim 1, characterized in that: Along the circumferential direction of the rotor magnetic ring, the magnetic circuit splicing blocks of the rotor magnetic ring are divided into one splicing block group or are sequentially divided into multiple splicing block groups; Each of the splicing block groups includes four magnetic circuit splicing blocks spliced ​​in sequence, which are divided into an inner magnetizing splicing block, a forward magnetic guiding splicing block, an outer magnetizing splicing block, and a reverse magnetic guiding splicing block, wherein: The inner magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially inwards; The forward magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the forward direction toward the outer magnetized splicing block; The external magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially outward; The reverse magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the reverse direction toward the outer magnetized splicing block.

3. A rotor magnetic ring according to claim 2, characterized in that: The forward magnetic conductive splicing block and the reverse magnetic conductive splicing block are both made of permanent magnetic materials. The forward magnetic conductive splicing block is divided into an S pole and an N pole along its radial direction, and the reverse magnetic conductive splicing block is divided into an N pole and an S pole along its radial direction.

4. A rotor magnetic ring according to claim 2, characterized in that: The angle between the side waist of each magnetic circuit splicing block and the chord corresponding to the longer arc surface is α, where: α=(2Π / LCM(Z, 2p))×GCD(Z, 2p)×p), where Z is the number of slots, 2P is the number of series, LCM is the least common multiple of the number of slots and the number of series, GCD is the greatest common divisor of the number of slots and the number of series, and P is the number of poles, which is half of the number of series.

5. A rotor magnetic ring according to claim 4, characterized in that: The included angle α between the side waist of each magnetic circuit splicing block and the chord corresponding to the longer arc surface is set to 30 degrees or 60 degrees.

6. A rotor magnetic ring according to claim 1, characterized in that: Along the circumferential direction of the rotor magnetic ring, the magnetic circuit splicing blocks of the rotor magnetic ring are divided into one splicing block group or are sequentially divided into multiple splicing block groups; Each of the splicing block groups includes a plurality of sequentially spliced ​​magnetic circuit splicing blocks, which are sequentially divided into an inner magnetizing splicing block, at least two sequentially spliced ​​forward magnetic guiding splicing blocks, an outer magnetizing splicing block, and at least two sequentially spliced ​​reverse magnetic guiding splicing blocks, wherein: The inner magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially inwards; The forward magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the forward direction toward the outer magnetized splicing block; The external magnetization splicing block is made of permanent magnetic material and is a magnetic circuit splicing block used for magnetization radially outward; The reverse magnetically conductive splicing block is a magnetic circuit splicing block used for conducting magnetism from the inner magnetized splicing block in the reverse direction toward the outer magnetized splicing block.

7. A rotor magnetic ring according to claim 2 or 6, characterized in that: At least part of the first splicing blocks are the internally magnetized splicing blocks, and another part of the first splicing blocks are the externally magnetized splicing blocks; And / or, at least part of the second splicing blocks are the forward magnetic conductive splicing blocks, and another part of the second splicing blocks are the reverse magnetic conductive splicing blocks.

8. A rotor magnetic ring according to claim 2 or 6, characterized in that: The number of the splicing block groups is set according to the number of winding slots of the iron core.

9. A rotor magnetic ring according to any one of claims 1 to 6, characterized in that: Along the radial direction of the rotor magnetic ring, the first splicing block and the second splicing block are arranged at the same height, the inner arc surface of the first splicing block and the inner arc surface of the second splicing block are arranged cocircularly, and the outer arc surface of the first splicing block and the outer arc surface of the second splicing block are arranged cocircularly.

10. A frameless motor, characterized in that: include: A rotor magnetic ring as claimed in any one of claims 1 to 9; The iron core is arranged on the outer periphery of the rotor magnetic ring.

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