Rotor structure of a micro direct current motor

Abstract

The utility model discloses a rotor structure of micro direct current motor, including the end head iron core and intermediate iron core of movable installation in the lateral surface of rotor shaft side and the positioning mechanism for locking the position of intermediate iron core and end head iron core, the utility model discloses the end head iron core and intermediate iron core of setting, and the connecting arm width of end head iron core is less than the width of intermediate iron core, forms the step through the connecting arm between two, when the copper wire passes through the corner in the winding process of micro direct current motor rotor, can gradually adjust the bending angle in two point support's mode, avoids the copper wire and directly bends into 90 degrees, thereby effectively reduces the broken wire phenomenon of copper wire in winding because of folding excessively, has improved copper wire broken wire abnormal problem significantly, has promoted the stability and reliability of winding, is especially suitable for the production and manufacture of micro direct current motor coating rotor.

Description

Technical Field

[0001] This utility model relates to the field of micro DC motor technology, and in particular to a rotor structure for a micro DC motor. Background Technology

[0002] A miniature DC motor is a compact and efficient electric drive device that uses DC power to generate power. It is widely used in various small electronic devices, such as toys, home appliances, and medical devices. This type of motor has advantages such as small size, light weight, fast response, and simple control. Its core components include the stator, rotor, and commutator. In a miniature DC motor, the rotor commutator plays a crucial role, responsible for converting electrical energy into mechanical energy and ensuring the motor's continuous and stable operation.

[0003] In the current market, the rotor design of common DC brushed motors typically uses a right-angle design at the winding corner. This design has certain technical defects in the motor manufacturing process, especially during the copper wire winding operation. When the copper wire passes through the right-angle corner of the rotor during winding, it needs to be bent at a 90-degree angle. This bending angle puts significant stress on the copper wire. Because the bending radius of the copper wire at the corner is small, it is easily scratched by the rotor corner, which can lead to copper wire breakage and cause wire breakage problems. This phenomenon not only reduces production efficiency but also affects the reliability and service life of the motor. Utility Model Content

[0004] One objective of this invention is to provide a rotor structure for a micro DC motor. This invention addresses the problem mentioned in the background where, during the winding process, the copper wire needs to be bent at a 90-degree angle at the right-angle corner of the rotor. This bending angle causes significant stress on the copper wire. Because the bending radius of the copper wire at the corner is small, it is easily scratched by the rotor at the corner, leading to copper wire breakage and poor wire quality. This phenomenon not only reduces production efficiency but also affects the reliability and service life of the motor.

[0005] According to an embodiment of the present invention, a rotor structure of a micro DC motor includes an end core and an intermediate core movably mounted on the side surface of the rotor shaft, and a positioning mechanism for locking the positions of the intermediate core and the end core. The end core includes a first inner ring, a first connecting arm, and a first outer ring. The intermediate core includes a second inner ring, a second connecting arm, and a second outer ring. The width of the first connecting arm is smaller than the width of the second connecting arm. Two sets of end cores are provided, and the two sets of end cores are respectively mounted at both ends of the intermediate core. A step is formed between the first connecting arm and the second connecting arm. The positioning mechanism includes a positioning hole, an upper positioning block, and a lower positioning block. The positioning hole is opened through the surface of the rotor shaft, and the upper positioning block and the lower positioning block are both inserted into the positioning hole.

[0006] Preferably, a baffle is movably connected to the side surface of the rotor shaft, and a coil hook is fixedly connected to the outer surface of the baffle.

[0007] Preferably, the outer surfaces of the intermediate iron core, the end iron core, and the coil hook are wound with coils.

[0008] Preferably, the upper positioning block is detachably fixed to the surface of the baffle by positioning bolts, and the lower positioning block is detachably fixed to the lower surface of the lower end iron core by positioning bolts.

[0009] Preferably, a stop bar is fixedly connected to the lower end of the rotor shaft, and both ends of the side surface of the stop bar are fixedly connected to the fixed end of the elastic telescopic rod.

[0010] Preferably, a top block is engaged with the lower surface of the end core at the lower end, and the top block is fixedly connected to the telescopic end of the elastic telescopic rod.

[0011] The beneficial effects of this utility model are:

[0012] This invention features an end core and an intermediate core, with the connecting arm of the end core being narrower than that of the intermediate core. Through the step formed between these connecting arms, during the winding process of a micro DC motor rotor, when the copper wire passes a corner, the bending angle can be gradually adjusted using a two-point support method. This prevents the copper wire from bending directly to 90 degrees, effectively reducing wire breakage due to excessive bending during winding. It significantly improves the problem of copper wire breakage, enhances the stability and reliability of winding, and is particularly suitable for the production and manufacturing of coated rotors for micro DC motors.

[0013] This invention, through its positioning mechanism, allows for positional adjustment of the structure on the outer side of the rotor shaft on its surface. After adjusting the structure according to different needs, the upper positioning block is inserted into the positioning hole, and the lower positioning block is inserted into the positioning hole at the bottom of the lower end core. The upper and lower positioning blocks are then fixed with positioning bolts, locking the core position. An elastic telescopic rod pushes the top block against the surface of the end core, achieving flexible adjustment of the rotor shaft's outer structure position and reliable locking of the core position. This improves equipment adaptability, optimizes performance, reduces vibration, extends service life, facilitates maintenance and installation, and allows for customized adjustments based on specific needs, thereby enhancing overall work efficiency and stability. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a three-dimensional schematic diagram of the rotor structure of a micro DC motor proposed in this utility model;

[0016] Figure 2 This is a three-dimensional schematic diagram from another angle of the rotor structure of a micro DC motor proposed in this utility model;

[0017] Figure 3 The present invention proposes a rotor structure for a micro DC motor. Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 This is a perspective view of the lower surface structure of the rotor structure of a micro DC motor proposed in this utility model;

[0019] Figure 5 The present invention proposes a rotor structure for a micro DC motor. Figure 4 Enlarged view of point B in the middle;

[0020] In the diagram: 1. Rotor shaft; 2. End core; 21. First inner ring; 22. First connecting arm; 23. First outer ring; 3. Intermediate core; 31. Second inner ring; 32. Second connecting arm; 33. Second outer ring; 4. Winding coil; 5. Coil hook; 6. Baffle; 7. Positioning mechanism; 71. Upper positioning block; 72. Positioning bolt; 73. Lower positioning block; 74. Positioning hole; 75. Stop bar; 76. Elastic telescopic rod; 77. Top block. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] refer to Figure 1-5 A rotor structure for a miniature DC motor includes an end core 2 and an intermediate core 3 movably mounted on the side surface of a rotor shaft 1, and a positioning mechanism 7 for locking the positions of the intermediate core 3 and the end core 2. The end core 2 includes a first inner ring 21, a first connecting arm 22, and a first outer ring 23. The intermediate core 3 includes a second inner ring 31, a second connecting arm 32, and a second outer ring 33. The width of the first connecting arm 22 is smaller than the width of the second connecting arm 32. Two sets of end cores 2 are provided, and the two sets of end cores 2 are respectively installed at both ends of the intermediate core 3. A step is formed between the first connecting arm 22 and the second connecting arm 32. The positioning mechanism 7 includes a positioning hole 74, an upper positioning block 71, and a lower positioning block 73. The positioning hole 74 is opened through the surface of the rotor shaft 1. The upper positioning block 71 and the lower positioning block 73 are both inserted into the positioning hole 74. Through the set end iron core 2 and the middle iron core 3, and the width of the connecting arm of the end iron core 2 is smaller than the width of the middle iron core 3, through the step formed between the two connecting arms, when the copper wire passes through the corner during the winding process of the micro DC motor rotor, the bending angle can be gradually adjusted by two-point support, avoiding the copper wire from being directly bent to 90 degrees. This effectively reduces the phenomenon of copper wire breakage caused by excessive bending during winding, significantly improves the abnormal problem of copper wire breakage, and enhances the stability and reliability of winding. It is particularly suitable for the production and manufacturing of coated rotors of micro DC motors.

[0023] Example 1: A baffle 6 is movably connected to the side surface of the rotor shaft 1. A coil hook 5 is fixedly connected to the outer surface of the baffle 6. A winding coil 4 is wound around the outer surface of the middle iron core 3, the end iron core 2 and the coil hook 5. The upper positioning block 71 is detachably fixed to the surface of the baffle 6 by positioning bolts 72. The lower positioning block 73 is detachably fixed to the lower surface of the lower end iron core 2 by positioning bolts 72.

[0024] Example 2: A stop bar 75 is fixedly connected to the lower end of the rotor shaft 1. Both ends of the side surface of the stop bar 75 are fixedly connected to the fixed end of the elastic telescopic rod 76. A top block 77 is engaged with the lower surface of the end core 2 at the lower end. The top block 77 is fixedly connected to the telescopic end of the elastic telescopic rod 76. Through the positioning mechanism 7, the structure on the outside of the rotor shaft 1 can be adjusted in position on the surface of the rotor shaft 1. After adjusting the structure on the outside of the rotor shaft 1 according to different needs, the upper positioning block 71 is inserted into the positioning hole 74, and the lower positioning block 73 is inserted into the positioning hole 74 at the lower part of the lower end core 2. The upper positioning block 71 and the lower positioning block 73 are fixed by the positioning bolt 72 to lock the position of the core. The top block 77 is pushed against the surface of the end core 2 by the elastic telescopic rod 76, realizing the flexible adjustment of the position of the structure on the outside of the rotor shaft 1 and the reliable locking of the position of the core. This improves the adaptability of the equipment, optimizes performance, reduces vibration, extends service life, facilitates maintenance and installation, and allows for customized adjustments according to specific needs, thereby improving overall work efficiency and stability.

[0025] In use, two sets of end cores 2 are respectively installed at both ends of the middle core 3, and the width of the first connecting arm 22 of the end core 2 is smaller than the width of the second connecting arm 32 of the middle core 3. This design allows the bending angle to be gradually adjusted by two-point support when the copper wire passes through a corner during the winding process of the micro DC motor rotor, avoiding the copper wire from bending directly to 90 degrees. This effectively reduces the phenomenon of wire breakage caused by excessive bending during winding, significantly improves the problem of abnormal copper wire breakage, and enhances the stability and reliability of winding. The upper positioning block 71 is detachably fixed to the surface of the baffle 6 by positioning bolts 72, and the lower positioning block 73 is detachably fixed to the lower surface of the lower end core 2 by positioning bolts 72. A stop bar 75 is fixedly connected to the lower end of the rotor shaft 1, and both ends of the side surface of the stop bar 75 are fixedly connected to the fixed end of the elastic telescopic rod 76. A top block 77 is engaged with the lower surface of the lower end core 2, and the top block 77 is fixedly connected to the telescopic end of the elastic telescopic rod 76. The positioning mechanism 7 allows the structure on the outer side of the rotor shaft 1 to be adjusted in position on the surface of the rotor shaft 1. After adjusting the structure on the outer side of the rotor shaft 1 according to different needs, the upper positioning block 71 is inserted into the positioning hole 74, and the lower positioning block 73 is inserted into the positioning hole 74 at the bottom of the lower end core 2. The upper positioning block 71 and the lower positioning block 73 are then fixed with positioning bolts 72, thus locking the core position. The elastic telescopic rod 76 presses the top block 77 against the surface of the end core 2, achieving flexible adjustment of the outer structure position of the rotor shaft 1 and reliable locking of the core position. This design not only improves equipment adaptability, optimizes performance, reduces vibration, and extends service life, but also facilitates maintenance and installation, and allows for customized adjustments according to specific needs, thereby improving overall work efficiency and stability. Through its ingenious structural design and operating principle, the entire device achieves efficient and stable production of coated rotors for micro DC motors.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rotor structure for a miniature DC motor, characterized in that, The device includes an end core (2) and an intermediate core (3) movably mounted on the side surface of the rotor shaft (1), and a positioning mechanism (7) for locking the positions of the intermediate core (3) and the end core (2). The end core (2) includes a first inner ring (21), a first connecting arm (22), and a first outer ring (23). The intermediate core (3) includes a second inner ring (31), a second connecting arm (32), and a second outer ring (33). The width of the first connecting arm (22) is smaller than that of the second connecting arm (32). The width of the end core (2) is provided in two sets. The two sets of end cores (2) are respectively installed at both ends of the middle core (3). A step is formed between the first connecting arm (22) and the second connecting arm (32). The positioning mechanism (7) includes a positioning hole (74), an upper positioning block (71) and a lower positioning block (73). The positioning hole (74) is opened through the surface of the rotor shaft (1). The upper positioning block (71) and the lower positioning block (73) are both inserted into the positioning hole (74).

2. The rotor structure of a micro DC motor according to claim 1, characterized in that, A baffle (6) is movably connected to the side surface of the rotor shaft (1), and a coil hook (5) is fixedly connected to the outer surface of the baffle (6).

3. The rotor structure of a micro DC motor according to claim 1, characterized in that, The outer surfaces of the intermediate iron core (3), the end iron core (2) and the coil hook (5) are wound with coils (4).

4. The rotor structure of a micro DC motor according to claim 1, characterized in that, The upper positioning block (71) is detachably fixed to the surface of the baffle (6) by positioning bolts (72), and the lower positioning block (73) is detachably fixed to the lower surface of the lower end iron core (2) by positioning bolts (72).

5. The rotor structure of a micro DC motor according to claim 1, characterized in that, The lower end of the rotor shaft (1) is fixedly connected to a stop bar (75), and both ends of the side surface of the stop bar (75) are fixedly connected to the fixed end of the elastic telescopic rod (76).

6. The rotor structure of a micro DC motor according to claim 1, characterized in that, A top block (77) is engaged with the lower surface of the end core (2) at the lower end, and the top block (77) is fixedly connected to the telescopic end of the elastic telescopic rod (76).

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