Agilent technologies, inc.

Abstract

The application discloses an AGS brushless motor which comprises a stator and a rotor, the rotor is arranged inside an outer ring body, the rotor holder is provided with a shaft hole in the center, a fixed shaft is inserted into the shaft hole, an outwardly expanding mounting cavity is arranged on the lower end of the inner wall of the shaft hole of the rotor holder, the mounting cavity is communicated with the shaft hole, a spring sheet is arranged on the mounting cavity and abuts against the fixed shaft penetrating through the shaft hole, the spring sheet rotates with the rotor, the spring sheet abuts against the fixed shaft and applies force to the fixed shaft in the axial direction, the radial shaking of the fixed shaft is prevented, the generation of noise is reduced, the axial shaking of the fixed shaft is also prevented due to the friction force between the spring sheet and the fixed shaft, and the self-closing force of the brushless motor under the power-off state is increased when the rotor is static.

Description

Technical Field

[0001] This invention relates to an AGS brushless motor. Background Technology

[0002] Brushless motors, with their advantages of electronic commutation, precise control, and high-efficiency conversion, are widely used in automotive actuators. To achieve power transmission, signal interaction, and intelligent control of brushless motors, fixed-shaft brushless motors are typically used in automotive actuators. A fixed shaft passes through the rotor shaft hole of a fixed-shaft brushless motor, and its upper and lower ends are fixed to the actuator housing. The fixed shaft serves to support and fix the mounting reference. The diameter of the fixed shaft is smaller than the inner diameter of the rotor shaft hole. When the rotor rotates at high speed, the fixed shaft will experience radial wobble, and during startup, there will also be axial wobble, thus generating some noise. Summary of the Invention

[0003] This invention provides an AGS brushless motor.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0005] An AGS brushless motor includes a stator and a rotor. The rotor is located inside the outer ring body and includes a rotor cage. The rotor cage has a central shaft hole, into which a fixed shaft is inserted. The lower end of the inner wall of the shaft hole of the rotor cage has an outwardly expanding mounting cavity, which is connected to the shaft hole. An outwardly protruding mounting post is provided on the rotor cage at the bottom outer side of the mounting cavity. A spring is provided inside the mounting cavity. One end of the spring is fixed to the rotor support frame, and the other end always abuts against the fixed shaft and applies a force towards the axis.

[0006] Preferably, the spring includes an elastic part and a fixed part. The elastic part includes a bending arm and a supporting arm. The top of the bending arm and the top of the supporting arm are bent and connected to form a U-shaped structure. The bending arm protrudes outward and arches to form an arched contact surface that abuts against the side wall of the fixed shaft.

[0007] Preferably, the outer side of the support arm is attached to the side wall of the mounting cavity opposite to the fixed shaft, the fixing part is the vertically outward extension of the bottom of the support arm, the fixing part abuts against the outer wall of the rotor cage, and the fixing part is provided with a fixing hole to cooperate with the mounting column.

[0008] Preferably, the rotor cage has an inwardly recessed magnet mounting groove on its side wall, and the magnet is fixed in the magnet mounting groove; the upper and lower ends of the fixed shaft are fixed to the actuator housing; there is a gap between the magnet and the inner wall of the outer ring body, and the diameter of the fixed shaft is smaller than the diameter of the shaft hole, that is, there is a gap between the fixed shaft and the shaft hole, and the gap between the fixed shaft and the shaft hole is smaller than the gap between the magnet and the inner wall of the outer ring body.

[0009] Preferably, the stator includes an iron core and an outer ring body sleeved outside the iron core. Several winding portions extend from the inner side of the outer ring body towards the center, and three-phase copper coils are wound at intervals around these winding portions. The three identical windings are spaced 120° apart. o Uniformly distributed.

[0010] Preferably, the bottom of the outer ring body is provided with a plurality of downwardly protruding transition portions that are opposite to the winding portion.

[0011] Preferably, three through holes are provided at intervals on the outer wall of the outer ring body, and a pin is inserted through the through hole. The enameled wire after winding is fixed to the bottom of the pin, and the top of the pin is soldered to the PCBA board.

[0012] Preferably, a gear is provided on the outer periphery of the top of the shaft hole of the rotor.

[0013] Preferably, the top of the outer ring body is provided with a plurality of positioning posts evenly spaced and opposite to the winding part, the positioning posts are located on the outside of the winding part, and the height of the positioning posts is higher than the height of the winding part.

[0014] Preferably, the upper end of the outer ring body has an outwardly extending protruding ear; the lower end of the outer ring body has an outwardly extending positioning block, which cooperates with the housing of the actuator; a grounding pin is also inserted on the outer side of the outer ring body, with the upper end of the grounding pin exposed on the outer side of the outer ring body and the lower end connected to the inside of the outer ring body.

[0015] Compared with the prior art, the AGS brushless motor of the present invention has an outwardly expanding mounting cavity at the bottom end of the shaft hole of the rotor. The mounting cavity is connected to the shaft hole, and a spring piece is provided at the mounting cavity to abut against the fixed shaft that passes through the shaft hole. When the rotor rotates, the spring piece rotates with the rotor. The spring piece always abuts against and applies a force in the axial direction to the fixed shaft, preventing radial wobbling of the fixed shaft and reducing noise generation. At the same time, since there is friction between the spring piece and the fixed shaft, it can also prevent axial wobbling of the fixed shaft. Furthermore, when the rotor is stationary, the spring piece can also increase the self-coupling force of the brushless motor in the power-off state. Attached Figure Description

[0016] Figure 1 This is a first three-dimensional schematic diagram of the AGS brushless motor of the present invention.

[0017] Figure 2 This is a second three-dimensional schematic diagram of the AGS brushless motor of the present invention.

[0018] Figure 3 This is a cross-sectional view of the AGS brushless motor of the present invention.

[0019] Figure 4 This is a schematic diagram of the spring contact of the AGS brushless motor of the present invention. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 4 As shown, the AGS brushless motor includes a stator 1 and a rotor 2. The stator 1 includes an iron core and an outer ring body 11 sleeved outside the iron core. Several winding portions 111 are arranged on the inner side of the outer ring body 11 extending towards the center. Three-phase copper coils are wound at intervals in the winding portions 111, and the three identical windings are spaced 120° apart. o Evenly distributed; nine winding sections 111 are provided.

[0022] The bottom of the outer ring body 11 is provided with a plurality of downwardly protruding transition portions 112 that are opposite to the winding portions 111. There are nine transition portions 112 in total. When the enameled wire of the same phase is wound on the winding portion 111, it transitions to another winding portion 111 through the transition portion 112. The transition portion 112 is provided at the bottom of the outer ring body 11 to prevent the enameled wire from contacting other components and causing mutual interference.

[0023] Three through holes 113 are spaced apart on the outer wall of the outer ring body 11. A pin 3 is inserted through the through hole 113. The enameled wire after winding is fixed to the bottom of the pin 3. The top of the pin 3 is welded to the PCBA board. The pin 3 isolates the welding point between the enameled wire and the PCBA board, ensuring that the enameled wire will not be damaged when welding the PCBA board. The PCBA board transmits current signals to the enameled wire through the pin, so that an electromagnetic field is generated inside the stator 1, thereby driving the rotor 2 to rotate.

[0024] The rotor 2 is located inside the outer ring body 11 and includes a rotor retainer 21. The side wall of the rotor retainer 21 is provided with an inwardly recessed magnet mounting groove, and the magnet 22 is fixed in the magnet mounting groove. There is a gap between the magnet 22 and the inner wall of the outer ring body 11.

[0025] The rotor cage 21 has a shaft hole 211 at its center, and a fixed shaft 4 is inserted into the shaft hole 211. The upper and lower ends of the fixed shaft 4 are fixed to the housing of the actuator, providing a rigid and constant support center for the rotor assembly. The diameter of the fixed shaft 4 is smaller than the diameter of the shaft hole 211, that is, there is a gap between the fixed shaft 4 and the shaft hole 211. The gap between the fixed shaft 4 and the shaft hole 211 is smaller than the gap between the magnet 22 and the inner wall of the outer ring body 11.

[0026] The rotor cage 21 has an outwardly expanding mounting cavity 212 on one side of the lower end of the inner wall of the shaft hole 211. The mounting cavity 212 is connected to the shaft hole 211 and is a square cavity. The rotor cage 21 on the bottom outer side of the mounting cavity 212 has an outwardly protruding mounting post 23.

[0027] The mounting cavity 212 is equipped with a spring piece 5, which includes an elastic part 51 and a fixing part 52. The elastic part 51 is roughly U-shaped and includes a bending arm 511 and a supporting arm 512. The top of the bending arm 511 and the top of the supporting arm 512 are bent and connected to form a U-shaped structure. The bending arm 511 arches outward to form an arched contact surface that abuts against the side wall of the fixed shaft 4. The outer side of the supporting arm 512 is attached to the side wall of the mounting cavity 212 opposite to the fixed shaft 4. The fixing part 52 is the vertically outward extension of the bottom of the supporting arm 512. The fixing part 52 abuts against the outer wall of the rotor retainer 21, and the fixing part 52 is provided with a fixing hole 521 that cooperates with the mounting post 23 to prevent the spring piece 5 from shifting.

[0028] When the stator 1 is energized, an electromagnetic field is generated on the inner side, which drives the rotor 2 to rotate. During the rotation of the rotor, the spring piece 5 rotates with the rotor 2 but always abuts against the fixed shaft 4 to prevent the fixed shaft 4 from wobbling radially and reduce the generation of noise. At the same time, since there is friction between the spring piece 5 and the fixed shaft 4, it can also prevent the fixed shaft 4 from wobbling axially.

[0029] A gear is provided on the outer periphery of the top of the shaft hole 211 of the rotor 2, so as to transmit torque to the next stage gear.

[0030] The top of the outer ring body 11 is evenly spaced with multiple positioning posts 114 that are opposite to the winding part 111. The positioning posts 114 are located on the outside of the winding part 111, and the height of the positioning posts 114 is higher than the height of the winding part 111. The functions of the positioning posts 114 are: i. to prevent the enameled wire wound at the winding part 111 from contacting with external components and causing interference between components; ii. to prevent the PCBA board from pressing on the coil at the winding part 111 and to protect the circuit safety.

[0031] The outer ring body 11 has an outwardly extending protruding ear 115 at the upper end of its outer wall, which serves a positioning function.

[0032] The lower end of the outer wall of the outer ring body 11 is provided with an outwardly extending positioning block 116. The positioning block 116 cooperates with the housing of the actuator to stably fix the brushless motor inside the actuator. Some of the positioning blocks 116 can also be located below the protruding ear 115, which can save space occupied by the brushless motor.

[0033] A grounding pin 6 is also inserted on the outer side of the outer ring body 11. The upper end of the grounding pin 6 is exposed on the outer side of the outer ring body 11, and the lower end is connected to the inside of the outer ring body 11, which increases the anti-interference ability and safety.

[0034] The AGS brushless motor of the present invention has an outwardly expanding mounting cavity 212 at the bottom end of the shaft hole 211 of the rotor 2. The mounting cavity 212 communicates with the shaft hole 211. A spring piece 5 is provided at the mounting cavity 212 to abut against the fixed shaft 4 that passes through the shaft hole 211. When the rotor 2 rotates, the spring piece 5 rotates with the rotor 2. The spring piece 5 always abuts against and applies a force to the fixed shaft 4 in the axial direction to prevent the fixed shaft 4 from wobbling radially and reduce noise generation. At the same time, since there is friction between the spring piece 5 and the fixed shaft 4, it can also prevent the fixed shaft 4 from axially wobbling. Furthermore, when the rotor 2 is stationary, the spring piece 5 can also increase the self-binding force of the brushless motor in the power-off state.

[0035] Finally, it should be noted that the above embodiments are only illustrative of the technical solutions of the present invention, and not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An AGS brushless motor, comprising a stator (1) and a rotor (2), wherein the stator (1) comprises an iron core and an outer ring body (11) sleeved outside the iron core, and the rotor (2) is disposed inside the outer ring body (11) and comprises a rotor cage (21), wherein a shaft hole (211) is provided at the center of the rotor cage (21), and a fixed shaft (4) is inserted into the shaft hole (211); characterized in that, The rotor cage (21) has an outwardly expanding mounting cavity (212) on one side of the lower end of the inner wall of the shaft hole (211). The mounting cavity (212) is connected to the shaft hole (211). The rotor cage (21) on the bottom outer side of the mounting cavity (212) has an outwardly protruding mounting post (23). The mounting cavity (212) has a spring piece (5) inside. One end of the spring piece (5) is fixed on the rotor cage (21), and the other end always abuts against the fixed shaft (4) and applies a force towards the axis.

2. The AGS brushless motor according to claim 1, characterized in that, The spring (5) includes an elastic part (51) and a fixed part (52). The elastic part (51) includes a bending arm (511) and a supporting arm (512). The top of the bending arm (511) and the top of the supporting arm (512) are bent and connected to form a U-shaped structure. The bending arm (511) arches outward to form an arched contact surface that abuts against the side wall of the fixed shaft (4).

3. The AGS brushless motor according to claim 2, characterized in that, The outer side of the support arm (512) is attached to the side wall of the mounting cavity (212) opposite to the fixed shaft (4). The fixing part (52) is the vertically outward extension of the bottom of the support arm (512). The fixing part (52) abuts against the outer wall of the rotor retainer (21), and the fixing part (52) is provided with a fixing hole (521) that cooperates with the mounting column (23).

4. The AGS brushless motor according to claim 1, characterized in that, The rotor cage (21) has an inwardly recessed magnet mounting groove on its side wall, and the magnet (22) is fixed in the magnet mounting groove; the upper and lower ends of the fixed shaft (4) are fixed to the housing of the actuator; there is a gap between the magnet (22) and the inner wall of the outer ring body (11), and the diameter of the fixed shaft (4) is smaller than the diameter of the shaft hole (211), that is, there is a gap between the fixed shaft (4) and the shaft hole (211), and the gap between the fixed shaft (4) and the shaft hole (211) is smaller than the gap between the magnet (22) and the inner wall of the outer ring body (11).

5. The AGS brushless motor according to claim 1, 2, or 3, characterized in that, The stator (1) includes an iron core and an outer ring body (11) sleeved outside the iron core. Several winding portions (111) are provided on the inner side of the outer ring body (11) extending towards the center. Three-phase copper coils are wound at intervals in the winding portions (111), with the three identical windings spaced 120° apart. o Uniformly distributed.

6. The AGS brushless motor according to claim 5, characterized in that, The bottom of the outer ring body (11) is provided with a plurality of downwardly protruding transition portions (112) that are opposite to the winding portion (111).

7. The AGS brushless motor according to claim 5, characterized in that, The outer ring body (11) has three through holes (113) spaced apart on its outer wall. A pin (3) is inserted through the through hole (113). The enameled wire after winding is fixed to the bottom of the pin (3), and the top of the pin (3) is welded and fixed to the PCBA board.

8. The AGS brushless motor according to claim 1, characterized in that, A gear is provided on the outer periphery of the top of the shaft hole (211) of the rotor (2).

9. The AGS brushless motor according to claim 5, characterized in that, The top of the outer ring body (11) is provided with a plurality of positioning posts (114) that are evenly spaced and opposite to the winding part (111). The positioning posts (114) are located on the outside of the winding part (111), and the height of the positioning posts (114) is higher than the height of the winding part (111).

10. The AGS brushless motor according to claim 5, characterized in that, The outer ring body (11) has an outwardly extending protruding ear (115) at the upper end of its outer wall; the outer ring body (11) has an outwardly extending positioning block (116) at the lower end of its outer wall, which cooperates with the housing of the actuator; a grounding pin (6) is also inserted on the outer side of the outer ring body (11), with the upper end of the grounding pin (6) exposed on the outer side of the outer ring body (11) and the lower end connected to the inside of the outer ring body (11).

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