Small brushless DC telescopic motor

Abstract

The utility model relates to the field of telescopic motor small -size brushless DC telescopic motor, including casing, stator subassembly and rotor subassembly, stator subassembly and rotor subassembly install in the casing, one end of rotor subassembly is provided with telescopic head, stator subassembly includes stator core and guide rail, the inner wall of stator core is provided with guide rail, the axis of guide rail is parallel with the axis of stator core, stator core fixed mounting is in the casing, rotor subassembly includes rotor frame and rotor core, rotor core fixed mounting is in the center of rotor frame, telescopic head is coaxially arranged in one end of rotor frame, one end of casing is provided with telescopic opening, and telescopic head extends to the outside of casing through telescopic opening, and the middle part of rotor frame and rotor core passes through stator core, and the side wall of rotor frame extends and has guide side wing, and the guide side wing and guide rail are slidably connected, and rotor frame can move in parallel in the casing along guide rail, has small friction, no back gap, the characteristic of quick response.

Description

Technical Field

[0001] This utility model relates to the field of telescopic motors, and in particular to small brushless DC telescopic motors. Background Technology

[0002] Telescopic motors, as actuators that convert rotary motion into linear reciprocating motion, are widely used in industrial automation positioning devices, robot joints, and various mechanical end effectors. For example, in home robotic vacuum cleaners, telescopic motors are often used to drive the raising and lowering of side brushes, the lifting of roller brushes, or the control of water tank dripping, enabling more intelligent and precise operations. As intelligent devices develop towards miniaturization, quieter operation, and higher reliability, higher requirements are being placed on the telescopic motors that drive their movements.

[0003] Currently, most common telescopic motors employ a structure combining a brushed DC motor with a lead screw, nut, and other transmission mechanisms. During operation, these motors generate continuous sliding contact and friction between the internal brushes and commutator. This not only produces unavoidable mechanical noise, affecting user experience, but also leads to rapid wear of the brushes and commutator, thus shortening the overall lifespan of the motor. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a small brushless DC telescopic motor, which can effectively solve the technical problem of continuous sliding contact and friction between the brush and the commutator.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A small brushless DC telescopic motor includes a housing, a stator assembly, and a rotor assembly. The stator assembly and rotor assembly are installed inside the housing. A telescopic head is provided at one end of the rotor assembly. The stator assembly includes a stator core and a guide rail. The guide rail is disposed on the inner wall of the stator core, and the axis of the guide rail is parallel to the axis of the stator core. The stator core is fixedly installed inside the housing. The rotor assembly includes a rotor frame and a rotor core. The rotor core is fixedly installed at the center of the rotor frame, and the axis of the rotor core coincides with the axis of the rotor frame. The telescopic head is coaxially disposed at one end of the rotor frame. A telescopic opening is provided at one end of the housing. The telescopic head extends through the telescopic opening to the outside of the housing. The rotor frame and rotor core pass through the middle of the stator core. Guide wings extend from the side wall of the rotor frame. The guide wings slide with the guide rail, and the rotor frame can move parallel to the guide rail within the housing.

[0007] Furthermore, the side wall of the telescopic head is provided with a sealing groove and a sealing ring, the sealing ring being disposed in the sealing groove and fitting against the inner wall of the telescopic opening.

[0008] Furthermore, the sealing ring has a U-shaped cross-section, with the inner ring of the sealing ring fitting against the inner wall of the sealing groove, the outer ring of the sealing ring having a raised sealing boss that fits against the inner wall of the telescopic opening, and an adjustment groove in the middle of the sealing ring.

[0009] Furthermore, a winding frame is installed inside the stator core. The winding frame consists of a front frame and a rear frame, which are symmetrically inserted into the wire slots of the winding frame from both ends.

[0010] Furthermore, the stator core is a spliced ​​core, consisting of a first core block and a second core block. Both the first and second core blocks are provided with winding leads. The first core block is provided with a locking interface, and the second core block is provided with a locking part. The locking interface and the locking part engage.

[0011] Furthermore, the stator core has a positioning boss on its side wall and a matching positioning groove on the inner wall of the housing.

[0012] Furthermore, the housing consists of a front cover and a rear cover, with a telescopic opening located at the end of the front cover away from the rear cover, and aligned positioning grooves provided on the inner walls of both the front cover and the rear cover.

[0013] Furthermore, the inner wall of the guide rail is provided with an oil reservoir.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: By replacing the traditional telescopic mechanism with a sliding fit structure of guide rails and guide wings, the rotor assembly, driven by the alternating magnetic field generated by the stator assembly, can smoothly and accurately perform linear reciprocating motion along the guide rail through the direct magnetic interaction between the rotor core and the stator core magnetic fields. It features low friction, zero backlash, and fast response, completely eliminating easily damaged components such as brushes, commutators, and bearings in traditional brushed motors. This fundamentally eliminates the main mechanical noise generated by high-speed friction between the brushes and the commutator, and also avoids motor failures caused by brush wear, making the motor run quieter, especially suitable for noise-sensitive environments such as homes and offices. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present utility model;

[0016] Figure 2 This is a radial cross-sectional view of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of this utility model;

[0018] Figure 4 This is an exploded view of the present invention;

[0019] Figure 5This is an assembly diagram of the front cover, rear shell, stator assembly, and rotor assembly in this utility model.

[0020] Figure 6 This is a perspective view of the stator assembly and rotor assembly in this utility model;

[0021] In the diagram, the numbers are: 1-shell, 101-front cover, 102-rear shell, 103-telescopic opening, 104-positioning groove, 2-stator assembly, 201-stator core, 2011-first core block, 2012-second core block, 2013-positioning boss, 202-guide rail, 203-winding frame, 2031-front frame, 2032-rear frame, 3-rotor assembly, 301-rotor frame, 3011-guide wing, 302-rotor core, 303-telescopic head, 3031-sealing groove, 304-sealing ring, 3041-adjusting groove, 3042-sealing boss. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The following is combined with Figures 1-6 A detailed description of the small brushless DC telescopic motor of this utility model is provided below:

[0024] A small brushless DC telescopic motor includes a housing 1, a stator assembly 2, and a rotor assembly 3.

[0025] The housing 1 is composed of a front cover 101 and a rear cover 102 connected by screws, which facilitates assembly and maintenance. A telescopic opening 103 is provided at the center of the end of the front cover 101. The rear cover 102 is used to close the housing 1 and accommodate electrical connection components.

[0026] The stator assembly 2 is fixedly installed inside the housing 1. The stator assembly 2 mainly includes a stator core 201, a guide rail 202, and a winding frame 203. The stator core 201 has a spliced ​​structure, which is formed by splicing a first core block 2011 and a second core block 2012. The first core block 2011 is provided with a snap-fit ​​interface, and the second core block 2012 is provided with a corresponding snap-fit ​​part. The complete stator core 201 is formed by the precise engagement of the snap-fit ​​interface and the snap-fit ​​part. This splicing design allows the winding operation to be performed externally before the core assembly, which greatly facilitates production. A positioning boss 2013 is provided on the side wall of the stator core 201, which cooperates with the positioning groove 104 on the inner wall of the housing 1 to prevent the stator assembly 2 from rotating or shifting during operation. The winding frame 203 is installed inside the stator core 201. It consists of a front frame 2031 and a rear frame 2032, which are symmetrically inserted into the wire slots at both ends of the winding frame 203. The coil is wound on the winding frame 203. Two parallel guide rails 202 are fixedly installed on the inner wall of the stator core 201, with their axes parallel to the axis of the stator core 201. The guide rails 202 are recessed grooves, and their inner walls can also be provided with oil reservoirs to store grease for long-term lubrication.

[0027] The modular stator core 201 represents a structural transformation from an inner stator to an outer winding system. This modular design allows the winding operation to be performed externally before the core assembly, completely solving the problems of narrow winding space and low efficiency in traditional inner stator motors. This results in significantly higher motor production efficiency compared to the inner winding method. It greatly facilitates the automated winding process, simplifies the assembly process, reduces production costs, and ensures the consistency and quality of coil winding.

[0028] The rotor assembly 3 is slidably disposed inside the stator assembly 2. The rotor assembly 3 includes a rotor frame 301, a rotor core 302, and a telescopic head 303. The rotor core 302 is fixedly installed at the center of the rotor frame 301, and its axis coincides with the axis of the rotor frame 301. The rotor core 302 is composed of two radially magnetized permanent magnets, with the magnetic poles of the upper and lower sections aligned but in opposite directions of magnetization, i.e., the upper section is the N pole and the lower section is the S pole, thus forming an optimized magnetic circuit. The telescopic head 303 is coaxially fixedly disposed at one end of the rotor frame 301. The sidewall of the rotor frame 301 extends outward with guide wings 3011, the end shape of which matches the recessed groove of the guide rail 202, forming a sliding fit, so that the rotor frame 301 can move smoothly in a straight line reciprocating along the guide rail 202 within the housing 1. The telescopic head 303 extends through the telescopic opening 103 of the front cover 101 to the outside of the housing 1 to perform a push-pull action. To improve wear resistance and self-lubricating properties, the rotor frame 301 and guide rail 202 are preferably made of POM engineering plastic.

[0029] The rotor core 302 is composed of two sections of radially magnetized magnets with opposite magnetic poles. This design creates a more optimized and concentrated magnetic field path, which can interact efficiently and synchronously with the alternating magnetic field generated by the stator winding, thereby providing a stronger and smoother linear electromagnetic thrust and improving the power density and response speed of the motor.

[0030] By replacing the traditional telescopic mechanism with a sliding fit structure of guide rail 202 and guide wing 3011, the rotor assembly 3, driven by the alternating magnetic field generated by the stator assembly 2, can smoothly and precisely perform linear reciprocating motion along the guide rail 202 through the direct magnetic interaction between the rotor core 302 and the stator core 201. This design features low friction, zero backlash, and fast response, completely eliminating easily worn components such as brushes, commutators, and bearings found in traditional brushed motors. This fundamentally eliminates the main mechanical noise generated by high-speed friction between the brushes and commutator, and also avoids motor failures caused by brush wear, making the motor run quieter, especially suitable for noise-sensitive environments such as homes and offices.

[0031] By eliminating the easily damaged brushes and commutator, the motor's main moving parts no longer require periodic replacement, resulting in a significant improvement in its lifespan and reliability. This structural simplification also reduces potential failure points, leading to a substantial increase in the overall lifespan of the motor compared to traditional brushed motors.

[0032] To further improve the reliability of the motor in harsh environments, a sealing groove 3031 is provided on the side wall of the telescopic head 303. A sealing ring 304 is disposed within the sealing groove 3031 and tightly fits against the inner wall of the telescopic opening 103. In this embodiment, the sealing ring 304 has a U-shaped cross-section. Its inner ring is fixedly fitted against the inner wall of the sealing groove 3031. Its outer ring is provided with a raised sealing boss 3042, which elastically fits against the inner wall of the telescopic opening 103, providing the main sealing function. An adjusting groove 3041 is provided in the middle of the sealing ring 304. This structure gives the sealing ring 304 good elastic deformation ability, ensuring excellent dustproof and waterproof sealing effect, and avoiding excessive frictional resistance due to excessive sealing, thus preventing the rotor assembly 3 from jamming.

[0033] The working principle is as follows:

[0034] When a specific sequence of alternating current is applied to the coils of stator assembly 2, a traveling alternating magnetic field is generated inside the stator core 201. This magnetic field interacts with the fixed magnetic field of rotor core 302, generating magnetic force. Since rotor assembly 3 is restricted to moving only along the axial direction through the sliding fit between guide wings 3011 and guide rail 202, the magnetic force is converted into a thrust that drives rotor assembly 3 to move linearly. By controlling the direction and timing of the current, the direction and stroke of rotor assembly 3 can be precisely controlled, thereby causing telescopic head 303 to extend or retract, realizing the push-pull function.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A small brushless DC telescopic motor, comprising a housing, a stator assembly, and a rotor assembly, wherein the stator assembly and the rotor assembly are installed within the housing, and a telescopic head is provided at one end of the rotor assembly, characterized in that: The stator assembly includes a stator core and a guide rail. The guide rail is disposed on the inner wall of the stator core, and the axis of the guide rail is parallel to the axis of the stator core. The stator core is fixedly installed inside the housing. The rotor assembly includes a rotor frame and a rotor core. The rotor core is fixedly installed at the center of the rotor frame, and the axis of the rotor core coincides with the axis of the rotor frame. A telescopic head is coaxially disposed at one end of the rotor frame. One end of the housing is provided with a telescopic opening. The telescopic head extends through the telescopic opening to the outside of the housing. The rotor frame and the rotor core pass through the middle of the stator core. The side wall of the rotor frame extends with guide wings. The guide wings slide with the guide rail, and the rotor frame can move parallel to the guide rail inside the housing.

2. The small brushless DC telescopic motor according to claim 1, characterized in that: The side wall of the telescopic head is provided with a sealing groove and a sealing ring, and the sealing ring is disposed in the sealing groove and fits against the inner wall of the telescopic opening.

3. The small brushless DC telescopic motor according to claim 2, characterized in that: The sealing ring has a U-shaped cross-section. The inner ring of the sealing ring fits against the inner wall of the sealing groove. The outer ring of the sealing ring is provided with a raised sealing boss, which fits against the inner wall of the telescopic opening. An adjustment groove is provided in the middle of the sealing ring.

4. The small brushless DC telescopic motor according to any one of claims 1-3, characterized in that: The stator core is equipped with a winding frame, which consists of a front frame and a rear frame. The front frame and the rear frame are symmetrically inserted into the wire slots of the winding frame from both ends.

5. The small brushless DC telescopic motor according to any one of claims 1-3, characterized in that: The stator core is a spliced ​​core, consisting of a first core block and a second core block. Both the first and second core blocks are provided with winding feet. The first core block is provided with a locking interface, and the second core block is provided with a locking part. The locking interface and the locking part engage.

6. The small brushless DC telescopic motor according to any one of claims 1-3, characterized in that: The stator core has a positioning boss on its side wall and a matching positioning groove on the inner wall of the housing.

7. The small brushless DC telescopic motor according to claim 6, characterized in that: The housing consists of a front cover and a rear cover. The telescopic opening is located at the end of the front cover away from the rear cover. The inner walls of both the front cover and the rear cover are provided with aligned positioning grooves.

8. The small brushless DC telescopic motor according to any one of claims 1-3, characterized in that: The inner wall of the guide rail is provided with an oil storage port.

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