Radial magnetizing ring winding single-phase permanent magnet motor

Abstract

The single-phase permanent magnet motor comprises a casing, a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are mounted in the casing, the stator assembly comprises a stator support, a U-shaped stator iron core, a thin annular stator iron core and an annular armature winding, and the stator support is provided with an annular winding groove and a U-shaped stator iron core clamping groove along the circumferential direction. The thin annular stator iron core and the annular armature winding are arranged in the annular winding groove, the U-shaped stator iron core is clamped in the U-shaped stator iron core clamping groove, the rotor assembly is arranged in the center of the stator support and comprises a rotor iron core and permanent magnets distributed in the circumferential direction of the rotor iron core, the permanent magnets are magnetized in the radial direction, and the magnetizing directions of the adjacent permanent magnets are opposite. According to the utility model, the advantage of high torque / power density is maintained, the problem that the micro motor is easy to manufacture is solved, the production cost is reduced, and meanwhile, a stable power supply voltage range can be provided and the output capability of the motor can be improved under the condition that the motor is at a high rotating speed.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a radially magnetized annular winding single-phase permanent magnet motor. Background Art

[0002] In recent years, with the development of distributed power supply and multi-electric technology, the power system has gradually replaced the hydraulic, pneumatic and other mechanical systems in traditional aircraft, making the secondary power system distributed in the form of electricity. Multi-electric and all-electric aircraft have become a new development direction in the contemporary era. The power supply system with ultra-high-speed turbine generator as the main body will become an important research direction of the power supply system of the new generation of multi-electric aircraft. Its principle is to use the gas tail flame and the high-speed airflow during the flight of the aircraft to drive the turbine to rotate and generate electricity.

[0003] The air flow of hypersonic vehicles reaches 400m / s. Therefore, the speed of the generator can reach 100,000r / min. Generally speaking, the electronic control system requires less power, about 50W. This will result in a very small size of the generator belonging to the micro motor. Therefore, for traditional generators, manufacturing will become a serious problem (stator / rotor core and wire embedding process issues).

[0004] The current motor system power density is still insufficient to meet the needs of large electric propulsion systems. The motor needs to provide sufficient power at high speeds and is lightweight. Permanent magnet motors have the characteristics of high power density, simple and strong structure, excellent high-speed performance, high reliability, strong fault tolerance, and good adaptability to harsh environments. They have significant technical advantages in ultra-high-speed working environments.

[0005] Patent CN 205154403 U proposes a micro high-speed power generation system for a turbojet engine. The independently designed high-speed AC three-phase permanent magnet generator includes a generator shaft, magnetic steel, generator stator laminations, generator stator coils and a housing, which can replace the battery to supply power to the engine's accessory system and the aircraft's electronic equipment. However, its structure is relatively complex and difficult to manufacture. Patent CN 103291381 A proposes a high-speed generator directly driven by an air turbine, including a generator housing, a casing, a turbine rotor, a permanent magnet assembly, and a coil winding, but it cannot generate enough electrical energy. The permanent magnets are also subject to large centrifugal forces and the electromagnetic attraction of the stator, and the installation and protection of the permanent magnets has become a technical difficulty.

[0006] Therefore, how to make the micro motor easy to manufacture, ensure a stable power supply voltage range under large speed changes, and improve the output capacity of the motor are technical problems that need to be solved urgently in this field. Utility Model Content

[0007] The purpose of the utility model is to provide a radially magnetized toroidal winding single-phase permanent magnet generator to solve the problems existing in the prior art. The permanent magnet generator provided by the utility model has a simple structure, is easy to manufacture, and can ensure a stable power supply voltage range under large speed changes.

[0008] To achieve the above purpose, the utility model provides the following solutions:

[0009] A radially magnetized annular winding single-phase permanent magnet motor comprises a casing, a stator assembly and a rotor assembly installed inside the casing, wherein the stator assembly comprises a stator bracket, a U-shaped stator core, a thin annular stator core and an annular armature winding, wherein the annular armature winding is a single-phase winding, and an annular winding slot and a U-shaped stator core clamping slot are circumferentially provided on the stator bracket, wherein the annular winding slot is located in the middle of the stator bracket in the axial direction, and a plurality of U-shaped stator core clamping slots are circumferentially spaced, wherein the thin annular stator core and the annular armature winding are placed in the annular winding slot, and the U-shaped stator core is clamped in the U-shaped stator core clamping slot, and the rotor assembly is arranged at the center of the stator bracket, and comprises a rotor core and permanent magnets distributed along the circumference of the rotor core, wherein the permanent magnets are radially magnetized, and the magnetization directions of adjacent permanent magnets are opposite.

[0010] Further, the U-shaped stator core includes an inner opening U-shaped stator core and an outer opening U-shaped stator core, the U-shaped stator core slot includes an inner opening U-shaped stator core slot and an outer opening U-shaped stator core slot, the inner opening U-shaped stator core slot and the outer opening U-shaped stator core slot are alternately distributed along the circumference of the stator bracket, the inner opening U-shaped stator core is clamped in the inner opening U-shaped stator core slot, and the outer opening U-shaped stator core is clamped in the outer opening U-shaped stator core slot.

[0011] Furthermore, the axial end surfaces of the inner opening U-shaped stator core and the outer opening U-shaped stator core are flush with the axial end surfaces of the stator bracket.

[0012] Furthermore, the sum of the number of the inner open U-shaped stator cores and the outer open U-shaped stator cores is consistent with the number of poles of the permanent magnet.

[0013] Furthermore, the inner opening U-shaped stator core and the outer opening U-shaped stator core are both formed by laminating silicon steel sheets.

[0014] Furthermore, the rotor core is in a thin cylindrical shape, and a plurality of permanent magnets are distributed along the circumference of the rotor core to form a circular ring, and the axial length of the rotor core is consistent with that of the circular ring.

[0015] Furthermore, a wire outlet hole is provided on the stator bracket.

[0016] The beneficial effects of the utility model are:

[0017] The permanent magnet motor provided by the utility model proposes a new topological structure of annular winding, which solves the problem of easy manufacturing of micro motors while retaining the advantages of high torque / power density, thereby reducing production costs; at the same time, the U-shaped stator core and the thin annular stator core are combined, and the U-shaped stator core can enhance the structural stability of the entire stator assembly while optimizing the magnetic field distribution, thereby ensuring the stability of the stator assembly of the motor at high speeds, thereby reducing the vibration and deformation of the rotor assembly caused by centrifugal force during rotation, and at the same time can also reduce the electromagnetic attraction of the permanent magnet, thereby ensuring that the motor provides a stable power supply voltage range under high speed conditions, thereby improving the output capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of the radially magnetized annular winding single-phase permanent magnet motor in the utility model;

[0020] Figure 2 This is a schematic structural diagram of the radially magnetized annular winding single-phase permanent magnet motor of the utility model after omitting the bottom plate;

[0021] Figure 3 It is a schematic diagram of the matching structure of the stator assembly and the rotor assembly of the radially magnetized annular winding single-phase permanent magnet motor in the utility model;

[0022] Figure 4 It is an exploded structural schematic diagram of the stator assembly of the radially magnetized annular winding single-phase permanent magnet motor in the utility model;

[0023] Figure 5 It is a schematic diagram of the stator support structure of the radially magnetized annular winding single-phase permanent magnet motor in the utility model;

[0024] Figure 6 It is a schematic diagram of the structure of an externally open U-shaped stator core of a radially magnetized annular winding single-phase permanent magnet motor in the utility model;

[0025] Figure 7 It is a schematic diagram of the structure of an inner-opening U-shaped stator core of a radially magnetized annular winding single-phase permanent magnet motor in the utility model;

[0026] Figure 8It is a schematic diagram of the permanent magnet structure of the radially magnetized annular winding single-phase permanent magnet motor in the utility model;

[0027] Fig. 9 It is a schematic diagram of the magnetic flux principle of the radially magnetized annular winding single-phase permanent magnet motor in the utility model.

[0028] in,

[0029] 1. Casing; 11. Lug; 12. Connection hole;

[0030] 2. stator assembly; 21. stator bracket; 211. annular winding slot; 212. inner opening U-shaped stator core slot; 213. outer opening U-shaped stator core slot; 214. outlet hole; 215. wire slot;

[0031] 22. Inner-open U-shaped stator core; 23. Outer-open U-shaped stator core; 24. Thin annular stator core; 25. Annular armature winding;

[0032] 3. rotor assembly; 31. rotor core; 32. permanent magnet;

[0033] 4. Rotating shaft;

[0034] 5. Base plate; 51. Mounting hole. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] refer to Figures 1 to 9As shown, this embodiment provides a novel radially magnetized annular winding single-phase permanent magnet generator structure, including a housing 1, a stator assembly 2 and a rotor assembly 3 installed inside the housing 1, the stator assembly 2 includes a stator bracket 21, a U-shaped stator core, a thin annular stator core 24 and an annular armature winding 25, the annular armature winding 25 is a single-phase winding, the manufacturing and winding are simple, and there is no need to consider the matching and constraint of the number of pole slots, etc. The stator bracket 21 is made of non-magnetic conductive material, and an annular winding slot 211 is opened on it along the circumferential direction. and a U-shaped stator core slot, the annular winding slot 211 is located in the axial middle part of the stator bracket 21, a plurality of U-shaped stator core slots are arranged at circumferential intervals, a thin annular stator core 24 and an annular armature winding 25 are placed in the annular winding slot 211, the U-shaped stator core is clamped in the U-shaped stator core slot, and the rotor assembly 3 is arranged at the center of the stator bracket 21, which includes a rotor core 31 and permanent magnets 32 distributed circumferentially along the rotor core 31, the permanent magnets 32 are radially magnetized, and the magnetization directions of adjacent permanent magnets 32 are opposite.

[0037] In this embodiment, at least two lugs 11 are formed on the circumferential surface of the casing 1, and a connecting hole 12 is opened on the lug 11. One end of the casing 1 is connected to a base plate 5, and the base plate 5 and the connecting hole 12 can be fixed by bolts, so that the stator assembly 2 and the rotor assembly 3 are accommodated and installed in the casing 1. A plurality of mounting holes 51 are arranged in a circumferential array on the base plate 5, so as to facilitate the installation and fixation of the entire permanent magnet motor; the rotor core 31 can be connected to the rotating shaft 4 through components such as a sleeve and a gasket, and the output end of the rotating shaft 4 extends to the outside of the casing 1 and can be connected to other components for transmission.

[0038] The permanent magnet motor provided in this embodiment proposes a new topological structure of annular winding, which has a simple overall structure, simple manufacturing and winding, and does not need to consider issues such as pole slot number matching and constraints. At the same time, the U-shaped stator core and the thin annular stator core 24 are combined. The U-shaped stator core can enhance the structural stability of the entire stator assembly 2 and optimize the magnetic field distribution, thereby ensuring the stability of the stator assembly 2 of the motor at high speeds, thereby reducing the vibration and deformation of the rotor assembly 3 caused by centrifugal force during rotation, and also reducing the electromagnetic attraction of the permanent magnet 32, thereby ensuring that the motor provides a stable power supply voltage range under high speed conditions, thereby improving the output capacity of the motor.

[0039] Continue to combine Figures 3 to 7As shown, in this embodiment, the U-shaped stator core includes an inner opening U-shaped stator core 22 and an outer opening U-shaped stator core 23, and the U-shaped stator core slot includes an inner opening U-shaped stator core slot 212 and an outer opening U-shaped stator core slot 213. The inner opening U-shaped stator core slot 212 and the outer opening U-shaped stator core slot 213 are alternately spaced along the circumference of the stator bracket 21, and the inner opening U-shaped stator core 22 is clamped in the inner opening U-shaped stator core slot 212, and the outer opening U-shaped stator core 23 is clamped in the outer opening U-shaped stator core slot 213; specifically, the non-slot portion on the stator bracket 21 protrudes outward like a tooth, and the left and right slot plates are the same in size and shape. The inner opening U-shaped stator core 22 and the outer opening U-shaped stator core 23 are axially connected and clamped in the corresponding U-shaped stator core slots on the stator bracket 21.

[0040] In this embodiment, by alternately arranging the inner open U-shaped stator core 22 and the outer open U-shaped stator core 23 at intervals, the structure of the stator assembly 2 can be made more stable, and at the same time it helps to optimize the magnetic field distribution, reduce magnetic resistance, and improve the magnetic flux efficiency of the motor, thereby improving the operating efficiency of the motor.

[0041] Furthermore, a wire outlet hole 214 is provided on the stator bracket 21, and the wire outlet hole 214 is located at a position on the stator bracket where the inner opening U-shaped stator core slot 212 and the outer opening U-shaped stator core slot 213 are not provided. At the same time, a wire passing groove 215 is formed radially outward along the wire outlet hole 214 toward the stator bracket 21. The wire outlet hole 214 and the wire passing groove 215 are provided to facilitate the lead wire of the annular armature winding 25 to pass directly from the stator bracket 21 without passing through other complex structures, thereby simplifying the wiring process and also providing a certain protection for the line. The lead wire can be connected to the external circuit after passing through the wire outlet hole 214 and the wire passing groove 215.

[0042] Combination Figure 3 It can be understood that the stator bracket 21 in the stator assembly 2 is concentrically arranged with the rotor core 31 and the permanent magnet 32 ​​in the rotor assembly 3. From the center of the circle along the radius outward, they are the rotor core 31, the permanent magnet 32, the outer open U-shaped stator core 23 or the inner open U-shaped stator core 22, the stator bracket 21, the annular armature winding 25, and the thin annular stator core 24; there is a radial air gap between the permanent magnet 32 ​​and the outer open U-shaped stator core 23 and the inner open U-shaped stator core 22.

[0043] Combination Fig. 9 The magnetic flux passes through the permanent magnet 32, the air gap, the outer open U-shaped stator core 23, the thin ring-shaped stator core 24, the inner open U-shaped stator core 22, the air gap, and the permanent magnet 32 ​​to form a main magnetic flux closed loop.

[0044] In some embodiments, the axial end faces of the inner opening U-shaped stator core 22 and the outer opening U-shaped stator core 23 are flush with the axial end faces of the stator bracket 21. That is, after the inner opening U-shaped stator core 22 is inserted into the inner opening U-shaped stator core slot 212 on the stator bracket 21, the two long tooth end faces (i.e., two vertical sides) of the inner opening U-shaped stator core 22 are flush with the axial end face of the stator bracket 21, just surrounding the annular armature winding 25, and the side end face of the inner opening U-shaped stator core 22 (i.e., the bottom edge connecting the two vertical sides) fills the inwardly concave portion of the left disk of the stator bracket 21. After the outer opening U-shaped stator core 23 is inserted into the outer opening U-shaped stator core slot 213 on the stator bracket 21, the two long tooth end faces (i.e., two vertical sides) of the outer opening U-shaped stator core 23 are flush with the axial end face of the stator bracket 21, and at the same time, they just surround the annular armature winding 25, and the side end face of the outer opening U-shaped stator core 23 (i.e., the bottom edge connecting the two vertical sides) fills the inwardly concave part of the right side of the stator bracket 21. When assembling, the annular armature winding 25 is first wound on the stator bracket 21, and then the thin annular stator core 23 is put on the stator bracket 21, and finally the outer opening U-shaped stator core 23 and the inner opening U-shaped stator core 22 are inserted, and the overall structure is neat and reasonable, which is convenient for assembly.

[0045] In this embodiment, the sum of the number of inner open U-shaped stator cores 22 and outer open U-shaped stator cores 23 is consistent with the number of poles of the permanent magnet 32 ​​, which can simplify the design and manufacturing process of the motor and make the magnetic field distribution of the motor more uniform.

[0046] refer to Figure 6 and Figure 7 In some preferred embodiments, the inner open U-shaped stator core 22 and the outer open U-shaped stator core 23 are both formed by laminating silicon steel sheets. Silicon steel sheets have the characteristics of high magnetic permeability, low hysteresis loss and low coercive force. The inner open U-shaped stator core 22 and the outer open U-shaped stator core 23 are made by laminating multiple layers of silicon steel sheets, which can reduce the hysteresis loss and eddy current loss generated by the magnetic field in the core, thereby reducing the heating of the core and improving the efficiency of the motor; at the same time, the silicon steel sheets have good mechanical strength and corrosion resistance, and can withstand the vibration and high temperature when the motor is running, ensuring the stable operation of the motor.

[0047] refer to Figure 2 and Figure 3 In this embodiment, the rotor core 31 is in a thin cylindrical shape, and a plurality of permanent magnets 32 are distributed along the circumference of the rotor core 31 to form a circular ring, and the axial length of the rotor core 31 is consistent with that of the circular ring; this can make the rotor assembly 3 more balanced in structure, help simplify the manufacturing process, reduce alignment and positioning errors during the assembly process, and ensure the performance consistency of the motor during the production process.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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.

[0050] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] Adaptive changes made according to actual needs are all within the protection scope of this utility model.

[0053] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

Claims

1. A radially magnetized toroidal winding single-phase permanent magnet motor, characterized in that: The invention comprises a casing, a stator assembly and a rotor assembly installed inside the casing, wherein the stator assembly comprises a stator bracket, a U-shaped stator core, a thin annular stator core and an annular armature winding, wherein the annular armature winding is a single-phase winding, and an annular winding slot and a U-shaped stator core clamping slot are circumferentially provided on the stator bracket, wherein the annular winding slot is located in the middle of the stator bracket in the axial direction, and a plurality of U-shaped stator core clamping slots are circumferentially spaced, wherein the thin annular stator core and the annular armature winding are placed in the annular winding slots, and the U-shaped stator core is clamped in the U-shaped stator core clamping slots, and the rotor assembly is arranged at the center of the stator bracket, and comprises a rotor core and permanent magnets distributed along the circumference of the rotor core, wherein the permanent magnets are radially magnetized, and adjacent permanent magnets are magnetized in opposite directions.

2. The radially magnetized toroidal winding single-phase permanent magnet motor according to claim 1, characterized in that: The U-shaped stator core includes an inner opening U-shaped stator core and an outer opening U-shaped stator core, the U-shaped stator core slot includes an inner opening U-shaped stator core slot and an outer opening U-shaped stator core slot, the inner opening U-shaped stator core slot and the outer opening U-shaped stator core slot are alternately distributed along the circumference of the stator bracket, the inner opening U-shaped stator core is clamped in the inner opening U-shaped stator core slot, and the outer opening U-shaped stator core is clamped in the outer opening U-shaped stator core slot.

3. The radially magnetized toroidal winding single-phase permanent magnet motor according to claim 2, characterized in that: The axial end surfaces of the inner opening U-shaped stator core and the outer opening U-shaped stator core are flush with the axial end surfaces of the stator bracket.

4. The radially magnetized toroidal winding single-phase permanent magnet motor according to claim 2, characterized in that: The sum of the number of the inner open U-shaped stator cores and the outer open U-shaped stator cores is consistent with the number of poles of the permanent magnet.

5. The radially magnetized toroidal winding single-phase permanent magnet motor according to claim 2, characterized in that: The inner opening U-shaped stator core and the outer opening U-shaped stator core are both formed by laminating silicon steel sheets.

6. The radially magnetized toroidal winding single-phase permanent magnet motor according to claim 1, characterized in that: The rotor core is in a thin cylindrical shape, and a plurality of permanent magnets are distributed along the circumference of the rotor core to form a circular ring. The axial length of the rotor core is consistent with that of the circular ring.

7. The radially magnetized toroidal winding single-phase permanent magnet motor according to claim 1, characterized in that: The stator bracket is provided with a wire outlet hole.

Images