Axial-radial flux permanent magnet motor

Abstract

The application provides a shaft radial flux permanent magnet motor, which comprises a shell assembly, an axial stator assembly, an axial rotor assembly, a radial rotor assembly and a radial stator assembly; the shell assembly comprises two end covers and a circular ring-shaped shell; the axial stator assembly comprises an axial stator fixing shaft, an axial stator fixing ring, a plurality of axial stator cores and a plurality of axial stator coils; the axial rotor assembly comprises two axial bearings, two axial magnetic yokes and a plurality of axial permanent magnets; the radial rotor assembly comprises two radial bearings, a radial magnetic yoke and a plurality of radial permanent magnets; and the radial stator assembly comprises a radial stator fixing frame, a plurality of radial stator cores, a plurality of radial stator coils and a radial stator fixing ring. The axial rotor assembly and the radial rotor assembly are integrated into a structure, so that the structural strength of the entire motor rotor is enhanced, the weight is reduced, the gap between the electromagnet and the permanent magnet is ensured to change within a certain range, the motor power variation range is ensured to be small, and the start-stop kinetic energy loss is reduced.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and specifically to a radial flux permanent magnet motor. Background Technology

[0002] Permanent magnet motors possess advantages such as easily adjustable air gap magnetic field, small magnetic adjustment amount, high operating efficiency, and high torque density, making them highly valuable for research. Torque density and torque ripple are two crucial indicators in motor design. Cogging torque caused by stator slotting is a significant source of torque ripple, making it essential to improve torque density and reduce torque ripple.

[0003] Permanent magnet motors can be classified into radial, axial, and transverse flux permanent magnet motors according to their magnetic flux path. Among them, axial flux permanent magnet motors have the characteristics of high power density and short axial length, making them suitable for low-speed, high-torque applications. In specific applications of permanent magnet motors, their speed is inversely proportional to the number of poles. At a fixed frequency, only increasing the number of poles can achieve a lower speed, but this also increases the motor's size. Therefore, existing axial and radial flux permanent magnet motors have the following technical problems:

[0004] 1. The existing axial flux motor rotor has low structural strength, resulting in a high failure rate;

[0005] 2. The lever arm length of the motor's magnetic force was not maximized;

[0006] 3. The length of the motor's magnetic circuit is too long, which affects the motor's efficiency;

[0007] 4. The energy conversion efficiency of motors is relatively low; currently, the energy conversion efficiency of motors in China is between 70% and 90%.

[0008] 5. The energy-to-mass ratio of the motor is 1-3 KW / kg, therefore it cannot meet the requirements for use in fields with mass restrictions, especially in the aerospace field;

[0009] 6. Currently available motors that can meet energy requirements are all too large, making installation inconvenient and preventing their application in fields with size or space constraints.

[0010] In view of the above problems, the designer, based on years of practical experience and professional knowledge in engineering applications of such products, actively researched and innovated in order to create a radial flux permanent magnet motor that is more practical. Summary of the Invention

[0011] The present invention was made to solve the above-mentioned problems, and its purpose is to provide an axial-radial flux permanent magnet motor.

[0012] This invention provides an axial-radial flux permanent magnet motor, characterized by comprising: a housing assembly including two end caps and an annular outer shell, the two end caps being respectively disposed at both ends of the outer shell.

[0013] An axial stator assembly includes an axial stator fixed shaft, an axial stator fixed ring, multiple axial stator cores, and multiple axial stator coils.

[0014] The axial stator fixing shaft is located inside the housing assembly, with one end fixed to an end cover. The axial stator fixing shaft has a shaft portion and a roller portion located on the shaft portion.

[0015] An axial stator retaining ring is sleeved on the roller section, and multiple retaining holes arranged circumferentially are opened on the axial end face of the axial stator retaining ring.

[0016] Multiple axial stator cores are all in the shape of a bobbin, each axial stator core is located in a fixed hole, and each axial stator coil is sleeved on an axial stator core;

[0017] The axial rotor assembly includes two axial bearings, two axial yokes, and multiple axial permanent magnets.

[0018] Both axial bearings are mounted on the fixed shaft of the axial stator and are located on the shaft sections on both sides of the roller section.

[0019] Each axial magnetic yoke has a flat plate portion and a boss portion located on one end face of the flat plate portion. Multiple fixing grooves arranged in a circumferential direction are opened on the other end face of the flat plate portion facing the axial stator fixing ring. Each fixing groove has a corresponding fixing hole. The middle part of the other end face of the flat plate portion has a groove or hole that allows the two axial magnetic yokes to be respectively fitted onto two axial bearings.

[0020] Each axial permanent magnet is housed in a fixed slot;

[0021] The radial rotor assembly includes two radial bearings, a radial yoke, and multiple radial permanent magnets.

[0022] Two radial bearings are respectively fitted onto the boss portions of two axial magnetic yokes.

[0023] The radial magnetic yoke is in the shape of a ring and is fitted on the axial stator fixing ring. Multiple grooves are arranged in a circumferential direction on the outer ring surface of the radial magnetic yoke, and each radial permanent magnet is located in one groove.

[0024] The radial stator assembly includes a radial stator retainer, multiple radial stator cores, multiple radial stator coils, and a radial stator retaining ring.

[0025] The radial stator retainer is fitted onto the radial magnetic yoke, and the outer ring surface of the radial stator retainer has multiple through holes arranged circumferentially.

[0026] Each radial stator core is shaped like a bobbin and is fitted into a through hole. Each radial stator coil is fitted onto one radial stator core.

[0027] The radial stator retaining ring is fitted onto the radial stator retaining frame. Multiple slots arranged circumferentially are provided on the inner ring surface of the radial stator retaining ring, and each slot corresponds to a radial stator core.

[0028] The axial-radial flux permanent magnet motor provided by this invention also has the following feature: the diameter of the two end caps is equal to the outer diameter of the outer shell.

[0029] The axial and radial flux permanent magnet motor provided by the present invention also has the following feature: both the axial stator fixing ring and the radial stator fixing bracket are made of epoxy resin.

[0030] The radial flux permanent magnet motor provided by the present invention also has the following features: both flat plates are disc-shaped, and both flat plates have multiple circumferentially arranged teeth on their annular end faces; the two annular ends of the radial yoke have multiple circumferentially arranged holes, and each hole has a corresponding tooth.

[0031] The axial-radial flux permanent magnet motor provided by the present invention also has the following feature: there are gaps between the two axial magnetic yokes and the axial stator fixing ring, and between the radial magnetic yoke and the radial stator fixing frame.

[0032] The radial flux permanent magnet motor provided by the present invention also has the following feature: the radial stator fixing frame is in the shape of a spool, and the width of the spool of the radial stator fixing frame is equal to the width of the radial stator fixing ring.

[0033] The role and effect of invention

[0034] According to the axial and radial flux permanent magnet motor of the present invention, by forming the axial rotor assembly and the radial rotor assembly into an integral structure, the structural strength of the entire motor rotor is enhanced and the weight is reduced. This ensures that the gap between the electromagnet and the permanent magnet varies within a certain range, thereby ensuring a smaller range of motor power variation, reducing start-stop kinetic energy loss, and thus improving the fatigue strength and service life of the motor. Furthermore, the energy conversion efficiency of the motor can reach over 96%. Moreover, by combining the axial and radial motors, and utilizing the outer ring of the axial motor for the radial motor, the lever arm of the motor's magnetic force is maximized. Additionally, the present invention uses dual electromagnets to strengthen the magnetic circuit, thereby compensating for the drawback of excessively long magnetic circuit length. Attached Figure Description

[0035] Figure 1 This is an exploded view of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the housing assembly in this invention;

[0037] Figure 3 This is a schematic diagram of the end cap structure in this invention;

[0038] Figure 4 This is a partial structural schematic diagram of the axial stator assembly in this invention;

[0039] Figure 5 This is a partial structural schematic diagram of the axial stator assembly in this invention;

[0040] Figure 6 This is a schematic diagram of the structure of a portion of the axial rotor assembly in this invention;

[0041] Figure 7 This is a schematic diagram of the structure of a portion of the radial rotor assembly in this invention;

[0042] Figure 8 This is a schematic diagram of the structure of a portion of the radial stator assembly in this invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 10. Housing assembly; 11. End cap; 12. Housing; 20. Axial stator assembly; 21. Axial stator fixing shaft; 22. Axial stator fixing ring; 221. Fixing hole; 23. Axial stator core; 24. Axial stator coil; 30. Axial rotor assembly; 31. Axial bearing; 32. Axial yoke; 321. Fixing groove; 322. Clamping tooth; 33. Axial permanent magnet; 40. Radial rotor assembly; 41. Radial bearing; 42. Radial yoke; 421. Groove; 422. Clamping hole; 43. Radial permanent magnet; 50. Radial stator assembly; 51. Radial stator fixing bracket; 52. Radial stator core; 53. Radial stator coil; 54. Radial stator fixing ring; 541. Clamping groove. Detailed Implementation

[0045] To make the technical means, creative features, objectives and effects of this invention easier to understand, the following embodiments are described in detail with reference to the accompanying drawings.

[0046] Example

[0047] Figure 1 This is an exploded view of the overall structure of the invention. Figure 2 This is a schematic diagram of the housing assembly in this invention. Figure 3 This is a schematic diagram of the end cap structure in this invention. Figure 4 This is a partial structural schematic diagram of the axial stator assembly in this invention. Figure 5 This is a partial structural schematic diagram of the axial stator assembly in this invention. Figure 6This is a schematic diagram of the structure of a portion of the axial rotor assembly in this invention. Figure 7 This is a schematic diagram of the structure of a portion of the radial rotor assembly in this invention. Figure 8 This is a schematic diagram of the structure of a portion of the radial stator assembly in this invention.

[0048] like Figures 1 to 8 As shown, this embodiment provides an axial-radial flux permanent magnet motor, including: a housing assembly 10, an axial stator assembly 20, an axial rotor assembly 30, a radial rotor assembly 40, and a radial stator assembly 50.

[0049] like Figures 1 to 3 As shown, the housing assembly 10 includes two end caps 11 and an annular outer shell 12, with the two end caps 11 respectively located at both ends of the outer shell 12.

[0050] In this embodiment, the two end caps 11 have frustum-shaped protrusions on their opposing surfaces for engaging with the outer casing 12, and a first annular protrusion for engaging the axial magnetic yoke 32. Furthermore, one end cap 11 also has a second annular protrusion for fixing the axial stator fixing shaft 21, and the other end cap 11 has a circular hole for the axial magnetic yoke 32 to extend from. The inner diameter of the second annular protrusion is equal to the diameter of the axial stator fixing shaft 21, the diameter of the frustum-shaped protrusion is equal to the inner diameter of the annular outer casing 12, and the inner diameter of the first annular protrusion is equal to the diameter of the protrusion portion of the axial magnetic yoke 32.

[0051] In this embodiment, the diameters of the two end caps 11 are equal to the outer diameter of the outer shell 12.

[0052] like Figure 1 , Figure 4 as well as Figure 5 As shown, the axial stator assembly 20 includes an axial stator fixing shaft 21, an axial stator fixing ring 22, multiple axial stator cores 23, and multiple axial stator coils 24. The axial stator fixing shaft 21 is disposed within the housing assembly 10, with one end fixed to an end cover 11. The axial stator fixing shaft 21 has a shaft portion and a roller portion located on the shaft portion. The axial stator fixing ring 22 is sleeved on the roller portion, and multiple circumferentially arranged fixing holes 221 are formed on the axial end face of the axial stator fixing ring 22. Each of the multiple axial stator cores 23 is in the shape of a bobbin, with each axial stator core 23 disposed within a fixing hole 221, and each axial stator coil 24 sleeved on an axial stator core 23.

[0053] In this embodiment, the number of axial stator cores 23 and axial stator coils 24 is preferably set to ten.

[0054] like Figure 1 and Figure 6As shown, the axial rotor assembly 30 includes two axial bearings 31, two axial yokes 32, and multiple axial permanent magnets 33. The two axial bearings 31 are both mounted on the axial stator fixed shaft 21 and are located on the shaft portions on both sides of the roller portion. Each axial yoke 32 has a flat plate portion and a boss portion located on one end face of the flat plate portion. Multiple circumferentially arranged fixing grooves 321 are formed on the other end face of the flat plate portion facing the axial stator fixed ring 22. Each fixing groove 321 has a corresponding fixing hole 221. The middle of the other end face of the flat plate portion has a groove or hole that allows the two axial yokes 32 to be respectively fitted onto the two axial bearings 31. Each axial permanent magnet 33 is disposed within a fixing groove 321.

[0055] In this embodiment, both the axial stator retaining ring 22 and the radial stator retaining bracket 51 are made of epoxy resin.

[0056] In this embodiment, both flat plates are disc-shaped, and both flat plates have multiple circumferentially arranged teeth 322 on their annular end faces. The two annular ends of the radial magnetic yoke 42 have multiple circumferentially arranged holes 422, and each hole 422 has a corresponding tooth 322.

[0057] like Figure 1 and Figure 7 As shown, the radial rotor assembly 40 includes two radial bearings 41, a radial yoke 42, and a plurality of radial permanent magnets 43. The two radial bearings 41 are respectively sleeved on the bosses of the two axial magnetic yokes 32. The radial magnetic yoke 42 is annular and is sleeved on the axial stator fixing ring 22. A plurality of grooves 421 arranged circumferentially are formed on the outer annular surface of the radial magnetic yoke 42, and each radial permanent magnet 43 is disposed in one groove 421.

[0058] In this embodiment, the number of radial permanent magnets 43 is preferably set to ten.

[0059] like Figure 1 and Figure 8 As shown, the radial stator assembly 50 includes a radial stator retainer 51, multiple radial stator cores 52, multiple radial stator coils 53, and a radial stator retaining ring 54. The radial stator retainer 51 is sleeved on the radial magnetic yoke 42, and multiple through holes arranged circumferentially are formed on the outer ring surface of the radial stator retainer 51. Each radial stator core 52 is spool-shaped and is fitted into a through hole, and each radial stator coil 53 is sleeved on a radial stator core 52. The radial stator retaining ring 54 is sleeved on the radial stator retainer 51, and multiple slots 541 arranged circumferentially are formed on the inner ring surface of the radial stator retaining ring 54, each slot 541 corresponding to a radial stator core 52.

[0060] In this embodiment, the radial stator fixing bracket 51 is in the shape of a spool, and the width of the spool of the radial stator fixing bracket 51 is equal to the width of the radial stator fixing ring 54.

[0061] In this embodiment, there are gaps between the two axial magnetic yokes 32 and the axial stator fixing ring 22, and between the radial magnetic yoke 42 and the radial stator fixing frame 51.

[0062] The role and effect of the embodiments

[0063] According to the axial and radial flux permanent magnet motor of the present invention, by forming the axial rotor assembly and the radial rotor assembly into an integral structure, the structural strength of the entire motor rotor is enhanced and the weight is reduced. This ensures that the gap between the electromagnet and the permanent magnet varies within a certain range, thereby ensuring a smaller range of motor power variation, reducing start-stop kinetic energy loss, and thus improving the fatigue strength and service life of the motor. Furthermore, the energy conversion efficiency of the motor can reach over 96%. Moreover, by combining the axial and radial motors, and utilizing the outer ring of the axial motor for the radial motor, the lever arm of the motor's magnetic force is maximized. Additionally, the present invention uses dual electromagnets to strengthen the magnetic circuit, thereby compensating for the drawback of excessively long magnetic circuit length.

[0064] The above embodiments are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A axial-radial flux permanent magnet motor, characterized in that, include: The housing assembly includes two end caps and an annular outer shell, with the two end caps respectively located at both ends of the outer shell. An axial stator assembly includes an axial stator fixed shaft, an axial stator fixed ring, multiple axial stator cores, and multiple axial stator coils. The axial stator fixing shaft is disposed within the housing assembly, with one end fixed to an end cover. The axial stator fixing shaft has a shaft portion and a roller portion located on the shaft portion. The axial stator retaining ring is sleeved on the roller portion, and the axial end face of the axial stator retaining ring has a plurality of retaining holes arranged in a circumferential direction. The plurality of axial stator cores are all in the shape of a bobbin, each axial stator core is disposed in a fixing hole, and each axial stator coil is sleeved on an axial stator core; The axial rotor assembly includes two axial bearings, two axial yokes, and multiple axial permanent magnets. Both axial bearings are mounted on the fixed shaft of the axial stator and are located on the shaft portions on both sides of the roller portion. Each of the axial magnetic yokes has a flat plate portion and a boss portion located on one end face of the flat plate portion. The other end face of the flat plate portion facing the axial stator fixing ring has a plurality of fixing grooves arranged in a circumferential direction. Each fixing groove has a corresponding fixing hole. The middle part of the other end face of the flat plate portion has a groove or hole that allows the two axial magnetic yokes to be respectively fitted onto the two axial bearings. Each of the axial permanent magnets is disposed in one of the fixed slots; The radial rotor assembly includes two radial bearings, a radial yoke, and multiple radial permanent magnets. Two radial bearings are respectively fitted onto the boss portions of the two axial magnetic yokes. The radial magnetic yoke is annular and is fitted onto the axial stator fixing ring. The outer ring surface of the radial magnetic yoke has multiple grooves arranged circumferentially, and each radial permanent magnet is disposed in one of the grooves. The radial stator assembly includes a radial stator retainer, multiple radial stator cores, multiple radial stator coils, and a radial stator retaining ring. The radial stator fixing bracket is sleeved on the radial magnetic yoke, and the outer ring surface of the radial stator fixing bracket has a plurality of through holes arranged circumferentially. Each of the radial stator cores is spool-shaped and is fitted into one of the through holes; each of the radial stator coils is sleeved on one of the radial stator cores. The radial stator fixing ring is sleeved on the radial stator fixing frame. The inner ring surface of the radial stator fixing ring has multiple slots arranged in a circumferential direction, and each slot corresponds to one of the radial stator cores.

2. The axial-radial flux permanent magnet motor according to claim 1, characterized in that: in, The diameters of the two end caps are equal to the outer diameter of the outer casing.

3. The axial-radial flux permanent magnet motor according to claim 1, characterized in that: in, Both the axial stator retaining ring and the radial stator retaining bracket are made of epoxy resin.

4. The axial-radial flux permanent magnet motor according to claim 1, characterized in that: in, Both of the flat plates are disc-shaped, and both of the flat plates have multiple circumferentially arranged teeth on their annular end faces. The two annular ends of the radial magnetic yoke have multiple circumferentially arranged holes, and each hole has a corresponding tooth.

5. The axial-radial flux permanent magnet motor according to claim 1, characterized in that: in, There are gaps between the two axial magnetic yokes and the axial stator fixing ring, and between the radial magnetic yoke and the radial stator fixing frame.

6. The axial-radial flux permanent magnet motor according to claim 1, characterized in that: in, The radial stator retainer is in the shape of a spool, and the width of the spool is equal to the width of the radial stator retaining ring.

Images