阅读说明：本技术 自屏蔽性磁体结构主动悬架电磁作动器 (Self-shielding magnetic structure active suspension electromagnetic actuator ) 是由 邓召学 李旭 刘天琴 于 2019-11-15 设计创作，主要内容包括：本发明提供一种自屏蔽性磁体结构主动悬架电磁作动器,包括具有轴孔状通孔的初级装配和装配于初级装配通孔内的次级装配；所述初级装配包括套筒、贴合套筒内周设置的筒形电枢芯及嵌装于所述筒形电枢芯内的线圈绕组；所述次级装配包括支撑轴、沿轴向套设于支撑轴外的双层筒形永磁体；所述双层筒形永磁体包括内层永磁体和套设于内层永磁体外的外层永磁体；内层永磁体由多个轴向环形永磁体III与多个导磁圆环背铁交替设置形成,并相邻轴向环形永磁体III间充磁方向相反；外层永磁体采用哈尔巴赫磁化阵列；利于增加磁力线聚集效应与自屏蔽性,提高作动器推力密度,具有响应速度块、控制精度高等优点,利于提高行车平顺性及操作稳定性,且装配简单方便。(The invention provides a self-shielding magnetic structure active suspension electromagnetic actuator, which comprises a primary assembly with a shaft hole-shaped through hole and a secondary assembly assembled in the primary assembly through hole; the primary assembly comprises a sleeve, a cylindrical armature core attached to the inner periphery of the sleeve and a coil winding embedded in the cylindrical armature core; the secondary assembly comprises a support shaft and a double-layer cylindrical permanent magnet sleeved outside the support shaft along the axial direction; the double-layer cylindrical permanent magnet comprises an inner permanent magnet and an outer permanent magnet sleeved outside the inner permanent magnet; the inner layer permanent magnet is formed by alternately arranging a plurality of axial annular permanent magnets III and a plurality of magnetic conductive annular back irons, and the magnetizing directions of the adjacent axial annular permanent magnets III are opposite; the outer layer permanent magnet adopts a Halbach magnetized array; the magnetic force line aggregation effect and the self-shielding property are favorably increased, the thrust density of the actuator is improved, the advantages of high response speed block and control precision are realized, the driving smoothness and the operation stability are favorably improved, and the assembly is simple and convenient.)

1. A self-shielding magnetic structure active suspension electromagnetic actuator is characterized in that: the assembly comprises a primary assembly with a shaft hole-shaped through hole and a secondary assembly assembled in the through hole of the primary assembly; the primary assembly comprises a sleeve, a cylindrical armature core attached to the inner periphery of the sleeve and a coil winding embedded in the cylindrical armature core; the secondary assembly comprises a support shaft and a double-layer cylindrical permanent magnet sleeved outside the support shaft along the axial direction; the double-layer cylindrical permanent magnet comprises an inner layer permanent magnet and an outer layer permanent magnet sleeved outside the inner layer permanent magnet; the inner layer permanent magnet is formed by alternately arranging a plurality of axial annular permanent magnets III and a plurality of magnetic conductive annular back irons, and the magnetizing directions of the adjacent axial annular permanent magnets III are opposite; the outer layer permanent magnet adopts a Halbach magnetization array.

2. The self-shielding magnet structure active suspension electromagnetic actuator of claim 1, wherein: the outer layer permanent magnet is formed by alternately arranging a plurality of annular permanent magnets I and annular permanent magnets II with trapezoidal axial sections along the axial direction, and the adjacent annular permanent magnets I and the annular permanent magnets II are attached to each other along the axial direction.

3. The self-shielding magnet structure active suspension electromagnetic actuator of claim 2, wherein: the long bottom side of the trapezoid of the axial section of the annular permanent magnet I is arranged close to the side of the axial annular permanent magnet III, and the long bottom side of the trapezoid is equal to the axial length of the corresponding axial annular permanent magnet III; the trapezoidal short bottom edge of the axial section of the annular permanent magnet II is arranged close to the side of the magnetic conductive ring back iron, and the axial length of the trapezoidal short bottom edge is equal to that of the corresponding magnetic conductive ring back iron; the annular permanent magnet II is arranged corresponding to the coil winding.

4. The self-shielding magnet structure active suspension electromagnetic actuator of claim 3, wherein: the annular permanent magnet I is formed by splicing a plurality of magnetic blocks I with fan-like structures, and each magnetic block I correspondingly forms two spliced surfaces; an axial through groove I is formed in one of the splicing surfaces of the magnetic blocks I, the radial width of the groove bottom of the axial through groove I is larger than that of the groove opening, a protruding portion I is arranged on the splicing surface, correspondingly matched with the adjacent magnet I, in a conformal mode, the adjacent magnet I is inserted into the axial through groove I in the axial direction, and the axial inserting assembly between the adjacent magnetic blocks I is formed.

5. The self-shielding magnet structure active suspension electromagnetic actuator of claim 3, wherein: the annular permanent magnet II is formed by splicing a plurality of similar fan-shaped magnetic blocks II, and each magnetic block II correspondingly forms two spliced surfaces; an axial through groove II is formed in one of the splicing surfaces of the magnetic blocks II, the radial width of the groove bottom of the axial through groove II is larger than that of the groove opening, a protruding portion II is arranged on the splicing surface, correspondingly matched with the adjacent magnet II, of the adjacent magnet II in a conformal mode, the protruding portion II is inserted into the axial through groove II along the axial direction, and the axial inserting assembly between the adjacent magnetic blocks II is formed.

6. The self-shielding magnet structure active suspension electromagnetic actuator of claim 1, wherein: the assembly clearance between the primary assembly and the secondary assembly is 0.5mm to 2 mm.

7. The self-shielding magnet structure active suspension electromagnetic actuator of claim 1, wherein: the primary assembly and the secondary assembly are clamped and fixed through end covers arranged at two axial ends, and linear bearings are arranged between the end covers at the two ends and the secondary assembly and used for linear reciprocating motion of the secondary assembly relative to the primary assembly.

8. The self-shielding magnet structure active suspension electromagnetic actuator of claim 7, wherein: the driving end of the secondary assembly is sleeved with an end cover I, and the free end of the secondary assembly is arranged on an end cover II; a buffer block is arranged between the free end of the secondary assembly and the end cover II, a certain gap is reserved between the buffer block and the top end of the end cover II, and the radial size of the buffer block is larger than that of the through hole of the primary assembly and used for axial limiting when the secondary assembly linearly reciprocates relative to the primary assembly.

9. The self-shielding magnet structure active suspension electromagnetic actuator of claim 8, wherein: a hanging ring structure I is arranged at the end part of the driving end of the secondary assembly; and the outer top end of the end cover II is provided with a lifting ring structure II.

10. The self-shielding magnet structure active suspension electromagnetic actuator of claim 1, wherein: the coil windings are multiple and are arranged in the armature core at intervals along the axial direction; the armature core is formed by laminating and clamping a plurality of stator punching sheets and is provided with a plurality of spaces for containing coil windings; the coil winding is a double-layer coil winding excited by a three-phase alternating current power supply in a lap winding wire embedding mode; the outer peripheral edges of the stator punching sheets are provided with punching sheet burrs, and the punching sheet burrs are not more than 0.05mm in length.

Technical Field

The invention relates to the field of vehicle active suspensions, in particular to an active suspension electromagnetic actuator with a self-shielding magnet structure.

Background

The active suspension system is a novel suspension system developed in recent years and has a function of controlling the motion of a vehicle body. When the spring is deformed due to inertia during braking or cornering of the vehicle, the active suspension system generates a force opposing the inertial force to reduce the vertical position change of the vehicle body.

The design of the active suspension actuator plays a crucial role in the effectiveness of the active control. The traditional active suspension actuator mostly adopts a hydraulic structure or a mode of adding a ball screw into a rotating motor, but has the problems of complex structure, poor reliability, slow response and the like. Electromagnetic actuators have been developed rapidly in recent years as force generators for active suspension systems, but they generally have disadvantages such as low magnetic flux density of the magnet structure and low actuator peak thrust. Therefore, it is important to find a special magnet structure to increase the magnetic line concentration effect and the self-shielding property, and to improve the thrust density of the actuator.

In view of the above, the present invention provides a self-shielding magnet structure active suspension electromagnetic actuator. This from shielding nature magnet structure initiative suspension electromagnetic actuator does benefit to and increases magnetic line of force gathering effect and from shielding nature, does benefit to and improves actuator thrust density, has the advantage that response speed piece, control accuracy are high, does benefit to the ride comfort and the operating stability that improve the driving, and the assembly is simple and convenient.

Disclosure of Invention

In view of the above, the invention provides an active suspension electromagnetic actuator with a self-shielding magnet structure, which is beneficial to increasing the magnetic line aggregation effect and the self-shielding property, improving the thrust density of the actuator and the thrust peak value of the actuator, has the advantages of a response speed block, high control precision, and is beneficial to improving the smoothness and the operation stability of a travelling crane, and is simple and convenient to assemble.

The invention relates to a self-shielding magnetic structure active suspension electromagnetic actuator, which comprises a primary assembly with a shaft hole-shaped through hole and a secondary assembly assembled in the through hole of the primary assembly; the primary assembly comprises a sleeve, a cylindrical armature core attached to the inner periphery of the sleeve and a coil winding embedded in the cylindrical armature core; the secondary assembly comprises a support shaft and a double-layer cylindrical permanent magnet sleeved outside the support shaft along the axial direction; the double-layer cylindrical permanent magnet comprises an inner layer permanent magnet and an outer layer permanent magnet sleeved outside the inner layer permanent magnet; the inner layer permanent magnet is formed by alternately arranging a plurality of axial annular permanent magnets III and a plurality of magnetic conductive annular back irons, and the magnetizing directions of the adjacent axial annular permanent magnets III are opposite; the outer layer permanent magnet adopts a Halbach magnetization array; the primary assembly is equivalent to an outer stator, the secondary assembly is equivalent to an inner rotor, the arrangement of the double-layer permanent magnet of the inner rotor is favorable for exciting the magnetic flux generated by the outer stator to be transmitted to the inner permanent magnet of the directional magnetic conduction through the outer Halbach array permanent magnet of the directional magnetic conduction and then transmitted back to the outer Halbach array permanent magnet, but not transmitted to the supporting shaft after being transmitted to the outer-layer Halbach array permanent magnet, is beneficial to avoiding the magnetic flux loss caused by being transmitted to the supporting shaft, the plurality of axial annular permanent magnets III and the plurality of magnetic conductive circular ring back irons are alternately arranged, so that the magnetic paths are favorably guided to ensure that the opposite magnetic paths cannot interfere with each other, the self-shielding characteristic of the outer-layer Halbach array permanent magnet is favorably improved, the magnetic leakage phenomenon is effectively inhibited, the aggregation of magnetic lines of force is favorably realized, and the smoothness and the operation stability of driving are favorably improved; the outer layer permanent magnet adopts a Halbach array permanent magnet, which is beneficial to increasing the area space of the interaction of the permanent magnet and a magnetic field generated by a coil winding, increasing the air gap flux density and improving the thrust peak value of the actuator; the axial direction here corresponds to the axial direction of the support shaft; the armature core is preferably an armature core; the selection of the material of inlayer permanent magnet, outer permanent magnet, magnetic conduction annular back iron, back shaft belongs to prior art, if the material of inlayer permanent magnet and outer permanent magnet is the neodymium iron boron material, the material of back shaft is for not leading magnetism thermal treatment to strengthen the aluminum alloy material, the material of magnetic conduction annular back iron is the silicon steel material that the magnetic conductivity is good, no longer gives details here.

Further, the outer layer permanent magnet is formed by alternately arranging a plurality of annular permanent magnets I and annular permanent magnets II with trapezoidal axial sections along the axial direction, and the adjacent annular permanent magnets I and the annular permanent magnets II are attached to each other along the axial direction; the axial force of the movement of the outer permanent magnet is favorably reduced, and the possibility that the outer permanent magnet is broken and falls off due to overlarge axial extrusion when a high-speed overload condition occurs is reduced; the axial direction here corresponds to the axial direction of the support shaft;

further, the long bottom side of the trapezoid of the axial section of the annular permanent magnet I is arranged close to the side of the axial annular permanent magnet III, and the long bottom side of the trapezoid is equal to the axial length of the corresponding axial annular permanent magnet III; the trapezoidal short bottom edge of the axial section of the annular permanent magnet II is arranged close to the side of the magnetic conductive ring back iron, and the axial length of the trapezoidal short bottom edge is equal to that of the corresponding magnetic conductive ring back iron; the annular permanent magnet II is arranged corresponding to the coil winding; the magnetic flux is transmitted to the inner permanent magnet through the outer Halbach array permanent magnet and then transmitted back to the outer Halbach array permanent magnet, mutual interference among opposite magnetic flux paths is avoided, the self-shielding characteristic of the outer Halbach array permanent magnet is improved, the magnetic leakage phenomenon is effectively inhibited, the area space of the interaction of the permanent magnet and a magnetic field generated by a coil winding is increased, the concentration density of magnetic force lines is increased, and the thrust peak value of the actuator is improved; the radial direction and the axial direction here correspond to the radial direction and the axial direction of the support shaft;

further, the annular permanent magnet I is formed by splicing a plurality of similar fan-shaped magnetic blocks I, and each magnetic block I correspondingly forms two spliced surfaces; an axial through groove I is formed in one of the splicing surfaces of the magnetic blocks I, the radial width of the groove bottom of the axial through groove I is larger than that of the groove opening, a protruding part I is arranged on the splicing surface, correspondingly matched with the adjacent magnet I, in a form-fitting manner and is inserted into the axial through groove I along the axial direction, and the axial inserting assembly between the adjacent magnetic blocks I is formed; preferably, the annular permanent magnet I is formed by splicing three 120-degree-angle radian magnetic blocks I, so that the manufacturing and processing difficulty of the annular permanent magnet I is reduced to a certain extent, and meanwhile, the dovetail embedded connection assembly mode among the magnetic blocks I of the annular permanent magnet I is favorable for greatly reducing the complexity of the assembly process and ensuring the cylindricity tolerance of the support shaft in the assembly process; the radial direction and the axial direction here correspond to the radial direction and the axial direction of the support shaft;

further, the annular permanent magnet II is formed by splicing a plurality of similar fan-shaped magnetic blocks II, and each magnetic block II correspondingly forms two spliced surfaces; an axial through groove II is formed in one of the splicing surfaces of the magnetic blocks II, the radial width of the groove bottom of the axial through groove II is larger than that of the groove opening, a protruding part II is arranged on the splicing surface, correspondingly matched with the adjacent magnet II, in a conformal manner and is inserted into the axial through groove II along the axial direction, and the axial insertion assembly between the adjacent magnetic blocks II is formed; preferably, the annular permanent magnet II is formed by splicing three 120-degree-angle radian magnetic blocks II, so that the manufacturing and processing difficulty of the annular permanent magnet II is reduced to a certain extent, and meanwhile, the dovetail embedded connection assembly mode among the magnetic blocks II of the annular permanent magnet II is favorable for greatly reducing the complexity of the assembly process and ensuring the cylindricity tolerance of the support shaft in the assembly process;

further, the assembly gap between the primary assembly and the secondary assembly is 0.5mm to 2mm, preferably 1 mm; the assembly gap between the primary assembly and the secondary assembly is the gap between the inner periphery of the through hole of the primary assembly and the outer permanent magnet; the stability of the assembly structure is improved; the radial direction and the axial direction here correspond to the radial direction and the axial direction of the support shaft;

further, the primary assembly and the secondary assembly are clamped and fixed through end covers arranged at two axial ends, and linear bearings are arranged between the end covers at the two ends and the secondary assembly and used for linear reciprocating motion of the secondary assembly relative to the primary assembly; the axial limit of the primary assembly and the secondary assembly is facilitated, and the linear reciprocating motion effect of the secondary assembly relative to the primary assembly is facilitated; the end covers at the two axial ends are respectively provided with a mounting hole, correspondingly, the end part of the primary assembly is correspondingly provided with a mounting hole for mounting the end cover on the primary assembly, and the fixed connection between the end covers at the two axial ends and the primary assembly belongs to the prior art, for example, the end covers are connected through screws or bolts, and the details are not repeated; the axial direction here refers to the axial direction of the support shaft;

furthermore, the driving end of the secondary assembly is sleeved with an end cover I, and the free end of the secondary assembly is arranged on an end cover II; the end cover I is provided with a through hole for the driving end of the secondary assembly to pass through, so that the driving end of the secondary assembly passes through the end cover to form connection with a corresponding part to transmit pushing force; a buffer block is arranged between the free end of the secondary assembly and the end cover II, a certain gap is reserved between the buffer block and the top end of the end cover II, the radial size of the buffer block is larger than that of the through hole of the primary assembly, and the buffer block is used for axial limiting when the secondary assembly linearly reciprocates relative to the primary assembly; the bumper is preferably fixed to the secondary assembly; the buffer block is arranged at the end part of the secondary assembly and has a certain gap with the top end of the end cover II, so that the axial buffer of the linear reciprocating motion of the secondary assembly relative to the primary assembly is facilitated; preferably, the buffer block is provided with an annular bulge outwards along the radial direction, and the annular bulge is used for forming buffer support on the radial inner side of the secondary assembly corresponding to the free end when the secondary assembly linearly reciprocates relative to the primary assembly and facilitating axial limit of the secondary assembly when the secondary assembly linearly reciprocates relative to the primary assembly; the outer end of the end cover I in the axial direction is also provided with a cover plate, and the fixed connection between the end cover I and the cover plate belongs to the prior art, for example, the connection is realized through screws or bolts, and the details are not repeated; an annular sealing ring is also arranged between the end cover I and the secondary assembly, namely the outer permanent magnet, and the annular sealing ring is arranged between the cover plate at the corresponding end and the linear bearing, so that axial sealing is facilitated; the axial and radial directions here correspond to the axial and radial directions of the support shaft;

further, a hanging ring structure I is arranged at the end part of the driving end of the secondary assembly; a lifting ring structure II is arranged at the outer top end of the end cover II; the arrangement of the hanging ring structure I and the hanging ring structure II is beneficial to forming connection with a vehicle body and wheels;

further, the coil windings are multiple and are arranged in the armature core at intervals along the axial direction; the armature core is formed by laminating and clamping a plurality of stator punching sheets and is provided with a plurality of spaces for containing coil windings; an insulation retainer ring is arranged at the radial outer end of the coil winding; the coil winding is a double-layer coil winding excited by a three-phase alternating current power supply in a lap winding wire embedding mode; the stator punching sheet is made of cold-rolled silicon steel sheets subjected to cold punching, and preferably made of DR530 silicon steel sheets with the thickness of 0.5mm and punched with teeth and grooves; punching sheet burrs are arranged on the outer periphery of the stator punching sheet, and the length of the punching sheet burrs is less than or equal to 0.05 mm; the processing precision is guaranteed.

The invention has the beneficial effects that: according to the active suspension electromagnetic actuator with the self-shielding magnet structure, due to the double-layer structure of the inner-layer outer-layer permanent magnet and the structure and the assembly arrangement of the inner-layer outer-layer permanent magnet, the increase of the area space of the interaction of the permanent magnet and a magnetic field generated by an electrified coil winding is facilitated, the guidance of a magnetic path is facilitated to ensure that the opposite magnetic paths do not interfere with each other, the increase of the magnetic line aggregation effect and the self-shielding property is facilitated, the improvement of the thrust density of the actuator and the improvement of the thrust peak value of the actuator are facilitated, the advantages of high response speed block and high control precision are achieved, the improvement of the smoothness.

Drawings

The invention is further described below with reference to the following figures and examples:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a secondary assembly of the present invention;

FIG. 3 is a schematic cross-sectional view of the arrangement of the secondary assembly corresponding to the annular permanent magnet I;

FIG. 4 is a schematic structural diagram of a magnetic block I according to the present invention;

FIG. 5 is a schematic structural diagram of a magnetic block II according to the present invention;

fig. 6 is a schematic diagram of the distribution of magnetic lines of force according to the present invention.

Detailed Description

FIG. 1 is a schematic structural view of the present invention, and FIG. 2 is a schematic structural view of a sub-assembly of the present invention; fig. 3 is a schematic cross-sectional view of a position where the annular permanent magnet I is disposed in a secondary assembly according to the present invention, fig. 4 is a schematic structural view of the present invention, fig. 5 is a schematic structural view of the present invention, and fig. 6 is a schematic magnetic force line distribution view of the present invention, as shown in the drawings: the self-shielding magnetic structure active suspension electromagnetic actuator of the embodiment comprises a primary assembly with a shaft hole-shaped through hole 22 and a secondary assembly assembled in the through hole 22 of the primary assembly; the primary assembly comprises a sleeve 1, a cylindrical armature core 23 attached to the inner periphery of the sleeve 1 and a coil winding 5 embedded in the cylindrical armature core 23; the secondary assembly comprises a support shaft 17 and a double-layer cylindrical permanent magnet sleeved outside the support shaft 17 along the axial direction; the double-layer cylindrical permanent magnet comprises an inner layer permanent magnet and an outer layer permanent magnet sleeved outside the inner layer permanent magnet; the inner layer permanent magnet is formed by alternately arranging a plurality of axial annular permanent magnets III9 and a plurality of magnetic conductive annular back irons 8, and the magnetizing directions of the adjacent axial annular permanent magnets III9 are opposite; the outer layer permanent magnet adopts a Halbach magnetization array; the outer layer permanent magnet comprises a plurality of annular permanent magnets I7 and an annular permanent magnet II 6; the primary assembly is equivalent to an outer stator, the secondary assembly is equivalent to an inner rotor, the arrangement of the double-layer permanent magnet of the inner rotor is favorable for exciting the magnetic flux generated by the outer stator to be transmitted to the inner permanent magnet of the directional magnetic conduction through the outer Halbach array permanent magnet of the directional magnetic conduction and then transmitted back to the outer Halbach array permanent magnet, but not transmitted into the supporting shaft after being transmitted to the outer-layer Halbach array permanent magnet, is beneficial to avoiding the magnetic flux loss caused by being transmitted to the supporting shaft, the plurality of axial annular permanent magnets III9 and the plurality of magnetic conductive circular ring back iron 8 are alternately arranged, so that the magnetic paths are favorably guided to ensure that the opposite magnetic paths cannot interfere with each other, the self-shielding characteristic of the outer-layer Halbach array permanent magnet is favorably improved, the magnetic leakage phenomenon is effectively inhibited, the aggregation of magnetic lines of force is favorably realized, and the smoothness and the operation stability of driving are favorably improved; the outer layer permanent magnet adopts a Halbach array permanent magnet, which is beneficial to increasing the area space of the interaction of the permanent magnet and the magnetic field generated by the coil winding 5, increasing the air gap flux density and improving the thrust peak value of the actuator; the axial direction here corresponds to the axial direction of the support shaft 17; the armature core 23 is preferably an armature core; the selection of inlayer permanent magnet, outer permanent magnet, magnetic conduction annular back iron 8, back shaft 17's material belongs to prior art, if the material of inlayer permanent magnet and outer permanent magnet is the neodymium iron boron material, back shaft 17's material is for not leading magnetism thermal treatment to strengthen the aluminum alloy material, magnetic conduction annular back iron 8's material is the silicon steel material that the magnetic conductivity is good, no longer gives unnecessary details here.

In the embodiment, the outer layer permanent magnet is formed by alternately arranging a plurality of annular permanent magnets I7 and II6 with trapezoidal axial sections along the axial direction, and the adjacent annular permanent magnets I7 and II6 are axially attached to each other; the axial force of the movement of the outer permanent magnet is favorably reduced, and the possibility that the outer permanent magnet is broken and falls off due to overlarge axial extrusion when a high-speed overload condition occurs is reduced; the axial direction here corresponds to the axial direction of the support shaft 17.

In the embodiment, the long bottom edge of the trapezoid of the axial section of the annular permanent magnet I7 is arranged close to the axial annular permanent magnet III9 side, and the long bottom edge of the trapezoid is equal to the axial length of the corresponding axial annular permanent magnet III 9; the trapezoid short bottom edge of the axial section of the annular permanent magnet II6 is arranged close to the side of the magnetic conductive circular ring back iron 8, and the length of the trapezoid short bottom edge is equal to the axial length of the corresponding magnetic conductive circular ring back iron 8; the annular permanent magnet II6 is arranged corresponding to the coil winding 5; the magnetic flux is transmitted to the inner permanent magnet through the outer Halbach array permanent magnet and then transmitted back to the outer Halbach array permanent magnet, mutual interference among opposite magnetic flux paths is avoided, the self-shielding characteristic of the outer Halbach array permanent magnet is improved, the magnetic leakage phenomenon is effectively inhibited, the area space of the interaction of the permanent magnet and the magnetic field generated by the coil winding 5 is increased, the concentration density of the magnetic force lines is increased, and the thrust peak value of the actuator is improved; the radial and axial directions herein correspond to the radial and axial directions of the support shaft.

In the embodiment, the annular permanent magnet I7 is formed by splicing a plurality of fan-like magnetic blocks I71, and each magnetic block I71 correspondingly forms two spliced surfaces; an axial through groove I711 is formed in one of the splicing surfaces of the magnetic blocks I, the radial width of the groove bottom of the axial through groove I711 is larger than that of the groove opening, a protruding part I712 is arranged on the splicing surface, correspondingly matched with the adjacent magnet I71, in a form-fitting manner and is inserted into the axial through groove I711 along the axial direction, and the axial insertion assembly between the adjacent magnetic blocks I71 is formed; preferably, the annular permanent magnet I7 is formed by splicing three 120-degree-angle radian magnetic blocks I71, so that the manufacturing and processing difficulty of the annular permanent magnet I7 is reduced to a certain extent, and meanwhile, the dovetail embedded connection assembly mode among the magnetic blocks I71 of the annular permanent magnet I7 is favorable for greatly reducing the complexity of the assembly process and ensuring the cylindricity tolerance of the support shaft 17 in the assembly process; the radial direction and the axial direction here correspond to the radial direction and the axial direction of the support shaft 17.

In the embodiment, the annular permanent magnet II6 is formed by splicing a plurality of fan-like magnetic blocks II61, and each magnetic block II61 correspondingly forms two spliced surfaces; an axial through groove II611 is formed in one of the splicing surfaces of the magnetic blocks II61, the radial width of the groove bottom of the axial through groove II611 is larger than that of the groove opening, a protruding part II612 is arranged on the splicing surface, corresponding to the adjacent magnet II61, in a form-fitting manner and is inserted into the axial through groove II611 along the axial direction, and the axial insertion assembly between the adjacent magnetic blocks II61 is formed; preferably, the annular permanent magnet II6 is formed by splicing three 120-degree-angle radian magnetic blocks II61, so that the manufacturing and processing difficulty of the annular permanent magnet II6 is reduced to a certain extent, and meanwhile, the dovetail embedded connection assembly mode among the magnetic blocks II61 of the annular permanent magnet II6 is favorable for greatly reducing the complexity of the assembly process and ensuring the cylindricity tolerance of secondary assembly in the assembly process.

In this embodiment, the assembly gap between the primary assembly and the secondary assembly is 0.5mm to 2mm, preferably 1 mm; the assembly gap between the primary assembly and the secondary assembly is the gap between the inner periphery of the through hole 20 of the primary assembly and the outer permanent magnet; the stability of the assembly structure is improved; the radial direction and the axial direction here correspond to the radial direction and the axial direction of the support shaft 17.

In this embodiment, the primary assembly and the secondary assembly are clamped and fixed by end caps arranged at two axial ends, and linear bearings (including the linear bearing 15 arranged at the end corresponding to the end cap I2 and the linear bearing 19 arranged at the end corresponding to the end cap II 10) are arranged between the end caps at two ends and the secondary assembly and are used for the linear reciprocating motion of the secondary assembly relative to the primary assembly; the axial limit of the primary assembly and the secondary assembly is facilitated, and the linear reciprocating motion effect of the secondary assembly relative to the primary assembly is facilitated; the end covers at two axial ends are respectively provided with a mounting hole, correspondingly, the end part of the primary assembly is correspondingly provided with a mounting hole for mounting the end cover on the primary assembly, and the fixed connection between the end covers at two axial ends and the primary assembly belongs to the prior art, such as the connection through screws or bolts (for example, the bolt 16 is arranged at the end corresponding to the end cover I2 and the bolt 18 is arranged at the end corresponding to the end cover II 10), and the description is omitted; the axial direction here refers to the axial direction of the support shaft 17.

In this embodiment, the driving end of the secondary assembly is sleeved with an end cover I2, and the free end of the secondary assembly is arranged on an end cover II 10; the end cover I2 is provided with a through hole for the driving end of the secondary assembly to pass through, so that the driving end of the secondary assembly passes through the end cover I2 to form connection with a corresponding part so as to transmit pushing force; a buffer block 11 is arranged between the free end of the secondary assembly and the end cover II10, a certain gap is reserved between the buffer block 11 and the top end of the end cover II10, and the radial size of the buffer block 10 is larger than that of the through hole of the primary assembly and is used for axial limiting when the secondary assembly linearly reciprocates relative to the primary assembly; the buffer block 11 is preferably fixed to the secondary assembly; the buffer block 11 is arranged at the end part of the secondary assembly and has a certain gap with the top end of the end cover II10, so that the axial buffer of the linear reciprocating motion of the secondary assembly relative to the primary assembly is facilitated; preferably, the buffer block 11 is provided with an annular protrusion 21 radially outwards, so that when the secondary assembly linearly reciprocates relative to the primary assembly, a buffer support for the radial inner side of the secondary assembly corresponding to the free end is formed, and axial limit of the secondary assembly during linear reciprocating relative to the primary assembly is facilitated; the cover plate 20 is further arranged at the outer end of the end cover I2 along the axial direction, and the fixed connection between the end cover I2 and the cover plate 20 belongs to the prior art, for example, the connection is through screws or bolts 14, which is not described herein again; an annular sealing ring 1 is arranged between the end cover I2 and a secondary assembly, namely an outer layer permanent magnet, and the annular sealing ring 1 is arranged between the cover plate 20 at the corresponding end and the linear bearing 15, so that axial sealing is facilitated; the axial direction and the radial direction here correspond to the axial direction and the radial direction of the support shaft 17.

In this embodiment, the driving end of the secondary assembly is provided with a hanging ring structure I13; the outer top end of the end cover II10 is provided with a hanging ring structure II 12; the arrangement of the hanging ring structure I13 and the hanging ring structure II12 is beneficial to forming connection with a vehicle body and wheels.

In this embodiment, the coil windings 5 are plural and are axially spaced in the armature core 23; the armature core 23 is formed by laminating and clamping a plurality of stator punching sheets and is provided with a plurality of spaces for accommodating the coil windings 5; the radial outer end of the coil winding 5 is provided with an insulating retainer ring 4; the coil winding 5 is a double-layer coil winding 5 excited by a three-phase alternating current power supply in a lap winding wire embedding mode; the stator punching sheet is made of cold-rolled silicon steel sheets subjected to cold punching, and preferably made of DR530 silicon steel sheets with the thickness of 0.5mm and punched with teeth and grooves; punching sheet burrs are arranged on the outer periphery of the stator punching sheet, and the length of the punching sheet burrs is less than or equal to 0.05 mm; the processing precision is guaranteed.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.