Embedded double-ended centering frameless motor fixing structure

Abstract

The application discloses an embedded double-end centering frameless motor fixing structure and belongs to the technical field of frameless motors. The embedded double-end centering frameless motor fixing structure comprises a fixing groove for installation and positioning, the inner wall of the fixing groove is provided with two convex edges which are arranged in a radial extension mode, an assembly groove is formed between the convex edges, and a motor stator is detachably installed in the assembly groove. A rotor is assembled in the motor stator, a rotating shaft is pre-inserted and fixed in the rotor, end covers are symmetrically installed on the axial two sides of the motor stator in the fixing groove, and a centering unit is arranged on each end cover in the fixing groove. The centering unit can be centrally positioned through a plurality of limiting blocks on a shaft disc, the coaxiality of the rotating shaft and the motor stator is ensured, the initial acceleration of the rotating shaft is slowed down in the moment of starting rotation under power-on, the instantaneous stress of a transmission component is reduced, and when the rotor rotates stably, the contact between the resistance-increasing wheel and the rotating shaft is separated, and the rotating driving of the rotating shaft under normal speed is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of frameless motors, and particularly relates to an embedded double-end centering frameless motor fixing structure. BACKGROUND

[0002] A frameless motor is a unique electric motor, the biggest feature of which is that there is no frame structure of a traditional motor and the frameless motor can be directly driven; the core advantage of the frameless motor lies in compact structure, light weight and good heat dissipation performance, and the frameless motor is widely applied to fields with high dynamic performance requirements such as robot arms, aerospace and precision machine tools; at present, in the installation and use of the frameless motor, a stator is usually directly fixed in an installation groove through gluing or bolts, and a rotor is supported and positioned by bearings and end covers; since the stator and the rotor lack assembly positioning of a shell, the coaxiality of the stator and the rotor is easily affected by cumulative errors, and air gaps are easily uneven and electromagnetic performance is easily reduced; and the fixing mode of the bearings and the end covers lacks the ability of real-time adjustment and cannot dynamically compensate for offsets in operation, which easily causes misalignment between the rotor and the stator, thereby causing vibration, noise and even performance reduction, especially at the moment of starting of the motor, the rotor may move eccentrically due to inertia or changes in external load.

[0003] Therefore, it is necessary to provide an embedded double-end centering frameless motor fixing structure to solve the problems in the background. SUMMARY

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: an embedded double-end centering frameless motor fixing structure, which comprises: a fixing groove for installation and positioning, two convex edges are arranged on the inner wall of the fixing groove in a radial direction, an assembly groove is formed between the convex edges, and a motor stator is detachably installed in the assembly groove; a rotor is assembled in the motor stator, and a rotating shaft is pre-inserted and fixed in the rotor; end covers are symmetrically installed on the axial two sides of the motor stator in the fixing groove, a plurality of circumferentially distributed heat dissipation holes are formed in the surface of each end cover; and a centering unit is arranged on each end cover in the fixing groove.

[0005] Preferably, two positioning rings I are symmetrically assembled on the two sides of the motor stator, a plurality of arc-shaped installation holes are formed in the positioning ring I, the positioning ring I is fixed to the motor stator by first bolts penetrating through the installation holes, a plurality of threaded holes are distributed on the positioning ring I, second bolts corresponding to the threaded holes are inserted into the convex edges, and the second bolts are threadedly connected with the threaded holes.

[0006] As preferred, the centering unit comprises a shaft sleeve slidingly installed in the end cover, one end of the rotating shaft is inserted into the shaft sleeve, a shaft disc is fixed to the lower end surface of the shaft sleeve, and a plurality of sliding grooves are circumferentially distributed on the shaft disc; a limiting block is assembled in each sliding groove and in sliding contact with the outer circumferential wall of the rotating shaft; a plurality of hinged frames corresponding to the sliding grooves are circumferentially distributed on the inner wall of the end cover, a support is rotatably connected to the hinged frame, one end of each support is connected to the limiting block, and an outer spring is connected between each support and the hinged frame.

[0007] As preferred, the end of the rotating shaft inserted into the shaft sleeve is sleeved with a limiting ring, a second positioning ring is slidingly connected in the shaft sleeve, and the second positioning ring abuts against the limiting ring; a plurality of rolling balls are embedded in the upper end surface of the second positioning ring and in rolling contact with the lower end surface of the limiting ring; and an inner spring is sleeved on the rotating shaft below the second positioning ring.

[0008] As preferred, an outer protection frame is fixed to the outer end surface of the end cover, the cross section of the outer protection frame is in arc shape, an adjusting plate is assembled on one side of the outer protection frame, and a central hole matched with the shaft sleeve is arranged in the center of the adjusting plate; a plurality of through holes are circumferentially and interval ly arranged on the inner circumferential wall of the central hole, and the shaft sleeve is fixedly connected with the adjusting plate through a pin inserted into the through hole.

[0009] As preferred, a sliding shaft is fixedly arranged on one end of the adjusting plate away from the central hole in horizontal direction, one end of the sliding shaft extends into the outer protection frame and slidingly cooperates with a hydraulic cavity formed in the outer protection frame to form an axially adjustable hydraulic guiding structure, and a hydraulic pipe is connected to the outer protection frame.

[0010] As preferred, a guide column is slidingly connected to the center of each limiting block, a fixed plate is fixed in the limiting block, the guide column slidingly penetrates into the fixed plate, a supporting spring is connected to one end of the guide column in the limiting block, and a ball is rollingly arranged on the other end of the guide column.

[0011] As preferred, a connecting rod is parallelly arranged on the left and right sides of the guide column in the fixed plate, the connecting rod is slidingly connected with the fixed plate, and a resistance increasing wheel is rotatably connected to the end of the connecting rod; a micro gear is rotatably arranged between the guide column and each connecting rod in the fixed plate, and each micro gear is in meshing transmission with the guide column and the connecting rod.

[0012] As preferred, the guide column is driven to extend out of the limiting block under the elastic force of the supporting spring, and at this time, the connecting rod is retracted into the fixed plate.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] The motor stator of the frameless motor in the application can be fixed between the assembly grooves composed of two convex edges in the fixed groove through the positioning ring, and the end cover can be installed in the fixed groove after the rotor is assembled, so as to realize the fixation of the motor stator and the rotor of the frameless motor; wherein the centering unit is arranged on the two end covers, the centering unit can be centrally positioned through the plurality of limiting blocks on the shaft disc before the rotor rotates, so as to ensure the coaxiality of the rotating shaft and the motor stator, at this time, the guide column on the limiting block is in contact with the rotating shaft through the ball, and the resistance increasing wheel on the connecting rod can be tightly pressed on the surface of the rotating shaft, which can provide a certain degree of rotation resistance, so as to slow down the initial acceleration of the rotating shaft in the moment of starting rotation, avoid the mechanical impact caused by the sudden increase of electromagnetic torque, reduce the instantaneous stress of the transmission component, prevent eccentric movement, and ensure the accurate alignment of the motor stator magnetic field when the motor starts, and when the rotor enters the stable rotation, the resistance increasing wheel is in contact with the rotating shaft and is separated, so as to realize the rotation driving of the rotating shaft at normal speed. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the frameless motor installation structure of the application;

[0016] Figure 2 It is a schematic diagram of the frameless motor installation structure of the application;

[0017] Figure 3 It is a schematic diagram of the frameless motor installation structure of the application;

[0018] Figure 4 It is a schematic diagram of the frameless motor installation structure of the application;

[0019] Figure 5 It is a schematic diagram of the frameless motor installation structure of the application;

[0020] Figure 6 It is a schematic diagram of the frameless motor installation structure of the application;

[0021] Figure 7 It is a schematic diagram of the frameless motor installation structure of the application;

[0022] Figure 8 It is a schematic diagram of the frameless motor installation structure of the application;

[0023] In the figure: 1, fixed groove; 11, convex edge; 12, end cover; 2, motor stator; 21, rotor; 22, rotating shaft; 23, positioning ring one; 24, first bolt; 25, second bolt; 3, centering unit; 31, shaft sleeve; 32, shaft disc; 33, sliding groove; 34, hinged frame; 35, support; 36, outer spring; 37, limiting ring; 38, positioning ring two; 39, inner spring; 4, outer guard frame; 41, adjusting plate; 42, center hole; 43, through hole; 44, sliding shaft; 5, limiting block; 51, guide column; 52, fixed plate; 53, supporting spring; 54, ball; 55, connecting rod; 56, resistance wheel; 57, micro gear. DETAILED DESCRIPTION

[0024] Please refer to Figures 1-8 In the embodiment of the present application, an embedded double-end centering frameless motor fixing structure comprises a fixed groove 1 for installation and positioning, the inner wall of the fixed groove 1 is provided with two convex edges 11 extending radially, an assembly groove is formed between the two convex edges 11, and a motor stator 2 is detachably installed in the assembly groove. The rigid support of the two symmetric convex edges 11 and the radial limiting of the assembly groove ensure that the motor stator 2 can be pre-positioned with high precision without additional clamps during installation.

[0025] In the embodiment, two positioning rings one 23 are symmetrically assembled on both sides of the motor stator 2, a plurality of arc-shaped installation holes are formed on the positioning ring one 23, the positioning ring one 23 is fixed to the motor stator 2 by the first bolt 24 passing through the installation hole, a plurality of threaded holes are distributed on the positioning ring one 23, the second bolt 25 corresponding to the threaded hole is inserted into the convex edge 11, and the second bolt 25 is threadedly connected with the threaded hole, so as to realize the installation and fixation of the motor stator 2.

[0026] As a preferred embodiment, the centering unit 3 comprises a shaft sleeve 31 slidingly installed in the end cover 12, one end of the rotating shaft 22 is inserted into the shaft sleeve 31, the lower end surface of the shaft sleeve 31 is fixedly provided with a shaft disc 32, and a plurality of sliding grooves 33 are circumferentially distributed on the shaft disc 32; each of the sliding grooves 33 is assembled with a limiting block 5, the limiting block 5 is in contact with the outer circumferential wall of the rotating shaft 22 when sliding in the sliding groove 33, so that the centering effect of the rotating shaft 22 can be achieved, and the coaxial installation of the rotating shaft 22 and the motor stator 2 is ensured; it should be noted that the end cover 12 should be coaxially positioned with the motor stator 2 during installation to prevent errors in subsequent positioning of the rotating shaft 22; a plurality of hinged frames 34 corresponding to the sliding grooves 33 are circumferentially distributed on the inner wall of the end cover 12, a support 35 is rotatably connected to the hinged frame 34, one end of each of the supports 35 is connected to the limiting block 5, and an outer spring 36 is connected between each of the supports 35 and the hinged frame 34, therefore, when the shaft sleeve 31 slides away from the side of the motor stator 2 along the axial direction, each of the hinged frames 34 can be synchronously deflected and push the limiting block 5 into contact with the outer wall of the rotating shaft 22, and as the displacement amount of the shaft sleeve 31 increases, the contact pressure between each of the limiting blocks 5 and the rotating shaft 22 increases, and the centering effect is stronger.

[0027] In the embodiment, the rotating shaft 22 is sleeved with a limiting ring 37 at one end inserted into the shaft sleeve 31, a positioning ring two 38 is slidingly connected in the shaft sleeve 31, and the positioning ring two 38 abuts against the limiting ring 37; a plurality of rolling balls are embedded in the upper end surface of the positioning ring two 38 and rolling contact with the lower end surface of the limiting ring 37; an inner spring 39 is sleeved on the rotating shaft 22 below the positioning ring two 38, so that when the centering units 3 on the two end covers 12 of the motor stator 2 simultaneously center the rotating shaft 22, the shaft sleeves 31 slide in opposite directions at this time, the inner spring 39 is gradually compressed at this time, the rotor 21 is kept stable in the axial direction, the axial movement caused by electromagnetic force or mechanical vibration is prevented, and the axial positioning of the rotor 21 is achieved.

[0028] In the embodiment, the outer side surface of the end cover 12 is fixedly provided with an outer protective frame 4, the cross section of the outer protective frame 4 is arc-shaped, the outer protective frame 4 is assembled with an adjusting plate 41 on one side, the center of the adjusting plate 41 is provided with a center hole 42 matched with the shaft sleeve 31; a plurality of through holes 43 are circumferentially and interval provided on the inner circumferential wall of the center hole 42, and the shaft sleeve 31 is fixedly connected with the adjusting plate 41 through the pins inserted into the through holes 43.

[0029] In the embodiment, the adjusting plate 41 is fixedly provided with a slide shaft 44 at one end away from the center hole 42 in the horizontal direction, one end of the slide shaft 44 extends into the outer guard frame 4 and is in sliding fit with a hydraulic cavity provided in the outer guard frame 4, forming an axially adjustable hydraulic guiding structure; the outer guard frame 4 is connected with a hydraulic pipe (not shown in the figure), that is, when the slide shaft 44 on the outer guard frame 4 slides away from the end cover 12 side under the hydraulic pushing, the adjusting plate 41 can push the shaft sleeve 31 to slide synchronously at this time, so as to realize the axial limiting of the rotor 21 and the radial center positioning of the rotating shaft 22.

[0030] As a preferred embodiment, the center of the limiting block 5 is slidingly connected with a guide column 51, the limiting block 5 is fixedly provided with a fixed plate 52, the guide column 51 slidingly penetrates the fixed plate 52, one end of the guide column 51 located in the limiting block 5 is connected with a supporting spring 53, and the other end is rolling provided with a ball 54, so as to be in rolling contact with the rotating shaft 22, ensuring the normal rotating movement of the rotating shaft 22.

[0031] In the embodiment, the fixed plate 52 is provided with a connecting rod 55 on the left and right sides of the guide column 51, the connecting rod 55 is in sliding fit with the fixed plate 52, and the end of the connecting rod 55 is rotatably connected with a resistance wheel 56; the fixed plate 52 is rotatably provided with a micro gear 57 between the guide column 51 and each connecting rod 55, each micro gear 57 is in meshing transmission with the guide column 51 and the connecting rod 55, wherein, when the resistance wheel 56 is in close contact with the rotating shaft 22, it can provide rotating driving resistance to the rotating shaft 22, especially in the initial stage of starting the rotating shaft 22, a plurality of resistance wheels 56 can be in close contact with the surface of the rotating shaft 22, effectively inhibiting the starting impact, avoiding the mechanical impact caused by the sudden increase of electromagnetic torque, and with the increase of the rotating speed of the rotating shaft 22, the rotating resistance of the resistance wheel 56 is nonlinearly attenuated, realizing smooth transition.

[0032] In the embodiment, the guide column 51 is driven to extend out of the limiting block 5 under the elastic force of the supporting spring 53, at this time, the connecting rod 55 is retracted in the fixed plate 52, specifically, before the frameless motor is started, the adjusting plate 41 on the outer protection frame 4 can drive each shaft sleeve 31 to move away from the motor stator 2, at this time, each limiting block 5 can fully contact the outer circumferential wall of the rotating shaft 22, and the supporting spring 53 in the limiting block 5 is in a completely compressed state, the guide column 51 on the limiting block 5 is in close contact with the rotating shaft 22 through the ball 54 and the resistance increasing wheel 56 and the connecting rod 55, respectively, the resistance increasing wheel 56 provides a rotating driving resistance to the rotating shaft 22 at the moment of starting the frameless motor, so as to ensure that the rotating shaft 22 rotates stably and accelerates, and with the rotating shaft 22 entering normal rotating motion, the shaft sleeve 31 reversely slides and resets, each limiting block 5 can be reset along the sliding groove 33 for a short distance, at this time, the supporting spring 53 drives the guide column 51 to gradually slide and extend out of the limiting block 5, and each resistance increasing wheel 56 can be separated from the rotating shaft 22 along with the connecting rod 55, so as to ensure that the rotating shaft 22 rotates normally at a normal speed.

[0033] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An embedded double-ended centering frameless motor fixing structure, characterized in that, It includes: The fixed groove (1) for installation positioning, the inner wall of the fixed groove (1) is provided with two convex edges (11) extending radially, the convex edges (11) form an assembly groove therebetween, and the motor stator (2) is detachably mounted in the assembly groove; The rotor (21) is assembled in the motor stator (2), and the rotating shaft (22) is pre-inserted and fixed in the rotor (21); The end cover (12) is symmetrically mounted on both axial sides of the motor stator (2) in the fixed groove (1), and a plurality of circumferentially distributed heat dissipation holes are formed in the surface of the end cover (12); The centering unit (3) is arranged on each end cover (12) in the fixed groove (1); The centering unit (3) includes a shaft sleeve (31) slidably mounted in the end cover (12), one end of the rotating shaft (22) penetrates the shaft sleeve (31), the lower end surface of the shaft sleeve (31) is fixedly provided with a shaft disc (32), and a plurality of sliding grooves (33) are circumferentially distributed on the shaft disc (32); A limiting block (5) is assembled in each sliding groove (33), and the limiting block (5) is in contact with the outer peripheral wall of the rotating shaft (22) during sliding in the sliding groove (33); A plurality of hinge frames (34) corresponding to the sliding grooves (33) are circumferentially distributed on the inner wall of the end cover (12), a support (35) is rotatably connected to the hinge frame (34), one end of each support (35) is connected to the limiting block (5), and an outer spring (36) is connected between each support (35) and the hinge frame (34); A guide column (51) is slidably connected to the center of the limiting block (5), a fixed plate (52) is fixed in the limiting block (5), the guide column (51) slidably penetrates the fixed plate (52), a supporting spring (53) is connected to one end of the guide column (51) in the limiting block (5), and a ball (54) is rotatably arranged at the other end of the guide column (51); A connecting rod (55) is parallelly arranged on the left and right sides of the guide column (51) in the fixed plate (52), the connecting rod (55) is slidably connected to the fixed plate (52), and a resistance increasing wheel (56) is rotatably connected to the end of the connecting rod (55); A micro gear (57) is rotatably arranged between the guide column (51) and each connecting rod (55) in the fixed plate (52), and each micro gear (57) is in meshing transmission with the guide column (51) and the connecting rod (55).

2. The fixed structure of an embedded double-ended centering frameless motor according to claim 1, characterized in that, Two positioning rings (23) are symmetrically assembled on both sides of the motor stator (2), a plurality of arc-shaped mounting holes are formed in the positioning ring (23), and the positioning ring (23) is fixed to the motor stator (2) by penetrating the mounting holes with the first bolt (24); A plurality of threaded holes are also distributed on the positioning ring (23), the second bolt (25) corresponding to the threaded holes is inserted into the convex edge (11), and the second bolt (25) is threadedly connected with the threaded hole.

3. The fixed structure of an embedded double-ended centering frameless motor according to claim 1, characterized in that, The end of the rotating shaft (22) sleeved with the limiting ring (37) extends into the shaft sleeve (31), the positioning ring two (38) is slidably connected in the shaft sleeve (31), and the positioning ring two (38) abuts against the limiting ring (37); The upper end surface of the positioning ring two (38) is embedded with a plurality of rolling balls arranged in rolling mode, and each rolling ball is in rolling contact with the lower end surface of the limiting ring (37); The inner spring (39) is sleeved below the positioning ring two (38) on the rotating shaft (22).

4. The fixed structure of the embedded double-ended centering frameless motor according to claim 1, characterized in that, The outer side end surface of the end cover (12) is fixed with the outer protection frame (4), the cross section of the outer protection frame (4) is in arc-shaped structure, one side of the outer protection frame (4) is assembled with the adjusting plate (41), and the center of the adjusting plate (41) is provided with the center hole (42) matched and assembled with the shaft sleeve (31); The inner peripheral wall of the center hole (42) is provided with a plurality of through holes (43) spaced apart in the circumferential direction, and the shaft sleeve (31) is fixedly connected with the adjusting plate (41) through the pin inserted into the through hole (43).

5. The fixed structure of an embedded double-ended centering frameless motor according to claim 4, characterized in that, The end of the adjusting plate (41) away from the center hole (42) is fixedly provided with the sliding shaft (44) in the horizontal direction, one end of the sliding shaft (44) extends into the outer protection frame (4) and is in sliding cooperation with the hydraulic cavity opened in the outer protection frame (4), forming an axially adjustable hydraulic guide structure. The outer protection frame (4) is connected with the hydraulic pipe.

6. The fixed structure of an embedded double-ended centering frameless motor according to claim 1, characterized in that, The guide column (51) is driven to extend out of the limiting block (5) under the elastic force of the supporting spring (53), at this time, the connecting rod (55) is retracted in the fixed plate (52).

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