Micromotor rotor skewed slot structure

Abstract

The utility model discloses a micro-motor rotor skewed slot structure, comprising a rotor iron core which is formed by a plurality of iron core sheets which rotate and are laminated along the axial direction of the rotor iron core. The iron core sheet comprises a punching sheet yoke part and a punching sheet tooth part, the punching sheet tooth part is of a T-shaped structure, and the side wall, far away from the punching sheet yoke part, of the punching sheet tooth part is provided with a transition cambered surface; a winding chute is formed between two adjacent rows of punching sheet tooth parts in the rotor iron core; and an included angle is formed between the central axis of the winding chute and the central axis of the shaft hole. Compared with a straight groove structure, the winding skewed slot can reduce the static friction force of the rotor of the micromotor during operation, reduce the loss, and further improve the operation efficiency and performance of the micromotor; when a magnetic field passes through the transition cambered surface on the side wall of the punching sheet tooth part, the transition cambered surface enables a magnetic field conduction path to become smoother, so that the resistance of magnetic field conduction is reduced, and the operation efficiency of the micromotor is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of micro motors, in particular to a micro motor rotor skew slot structure. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy according to the law of electromagnetic induction. Its main function is to generate driving torque. It is used as a power source for electrical appliances or various machines. It can be divided into large, medium and micro motors according to size. The rotor is the rotating part of the motor. It is a component used to convert electrical energy into mechanical energy or mechanical energy into electrical energy.

[0003] In the prior art, the stamping sheets of the rotor core are laminated in an up-and-down straight stacking process, which results in the rotor winding slots of the micromotor being a straight slot structure. The straight slot shape in the rotor core with the straight slot structure makes the static friction of the rotor relatively high, thereby increasing the mechanical loss of the micromotor and reducing the rotor operation efficiency. In addition, the rotor core with the straight slot structure has a large magnetic field leakage, and the magnetic field cannot be completely concentrated in the rotor core, so that part of the magnetic field leaks into the surrounding space, causing energy loss.

[0004] Therefore, the prior art has defects and needs to be improved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a micro-motor rotor skew slot structure with low static friction and reduced magnetic field leakage.

[0006] To achieve this purpose, the utility model adopts the following technical solutions: a micro-motor rotor skew slot structure, including a rotor core, the rotor core is formed by rotating and stacking a plurality of iron sheets along the axial direction;

[0007] The core sheet includes a punching sheet yoke and a punching sheet tooth portion, and a plurality of the punching sheet teeth portions are arranged equidistantly along the circumference of the punching sheet yoke portion;

[0008] The middle part of the punching plate yoke is provided with an axial hole connected to the rotor, the punching plate tooth part is in a T-shaped structure, and the side wall of the punching plate tooth part away from the punching plate yoke is provided with a transition arc surface;

[0009] A winding skew groove is formed between two adjacent rows of punching teeth in the rotor core;

[0010] An angle is formed between the central axis of the winding inclined groove and the central axis of the axial hole, and the angle range of the angle is 8-15°.

[0011] By adopting the above technical solution, in the micromotor rotor skew slot structure, the angle between the central axis of the winding skew slot and the central axis of the shaft hole is 12°.

[0012] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, the iron core sheet is made of silicon steel.

[0013] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, the number of punching teeth of each iron core sheet is six or eight groups.

[0014] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, the punching sheet yoke part and the punching sheet tooth part are an integrally formed structure.

[0015] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, the surface of the rotor core is coated with an insulating paint layer.

[0016] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, both ends of the punching sheet tooth portion are respectively provided with a first transition fillet.

[0017] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, a second transition fillet is provided at the junction between the punching tooth portion and the punching yoke portion.

[0018] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, the thickness of the iron core sheet is 1-3 mm.

[0019] By adopting the above-mentioned technical solutions, in the micromotor rotor skew slot structure, the slot width of the winding skew slot is 1-4 mm.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The rotor core of the utility model is formed by rotating and stacking a plurality of iron core sheets along the axial direction thereof, so that the rotor core can form winding bevel grooves, which can reduce magnetic resistance loss. Compared with the straight slot structure, the winding bevel grooves can reduce the static friction of the rotor of the micromotor during operation, reduce losses, and thus improve the operating efficiency and performance of the micromotor; the iron core sheet includes a punching sheet yoke portion and a punching sheet tooth portion, and the side wall of the punching sheet tooth portion away from the punching sheet yoke portion is provided with a transition arc surface. When the magnetic field passes through the transition arc surface on the side wall of the punching sheet tooth portion, the path of magnetic field conduction can be made smoother, thereby reducing the resistance to magnetic field conduction, reducing magnetic resistance loss, and effectively improving the operating efficiency of the micromotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0026] Figure 3 It is a front structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0027] In order to make the utility model's purpose, features, and advantages more obvious and easy to understand, the following will be combined with the drawings in the utility model embodiments to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the embodiments described below are only part of the utility model embodiments, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0029] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0030] like Figures 1 to 3 As shown, the embodiment of the utility model provides a micro-motor rotor skew slot structure, including a rotor core 1, wherein the rotor core 1 is formed by rotating and stacking a plurality of iron core sheets 10 along the axial direction thereof;

[0031] The iron core sheet 10 includes a punching sheet yoke 101 and a punching sheet tooth portion 102, and a plurality of the punching sheet tooth portions 102 are equidistantly arranged along the circumferential direction of the punching sheet yoke portion 101; the punching sheet yoke portion 101 can provide a stable structural support for transmitting torque and rotational motion; when current passes through the coil winding of the rotor, a magnetic field is generated under the action of the punching sheet tooth portion 102, and then a magnetic flux is formed in the iron core sheet 10, and these magnetic fluxes form a closed magnetic circuit through the punching sheet tooth portion 102, so that the magnetic field can generate and transmit torque.

[0032] The middle part of the punching plate yoke 101 is provided with an axial hole 100 connected to the rotor, the punching plate tooth portion 102 is in a T-shaped structure, and the side wall of the punching plate tooth portion 102 away from the punching plate yoke portion 101 is provided with a transition arc surface 103; when the magnetic field passes through the side wall of the punching plate tooth portion 102, the transition arc surface 103 can make the path of magnetic field conduction smoother, thereby reducing the resistance of magnetic field conduction, reducing magnetic resistance loss, and effectively improving the operation efficiency of the micro motor;

[0033] like Figures 1 to 3 As shown, a winding bevel groove 104 is formed between two adjacent rows of the punching teeth 102 in the rotor core 1; the rotor core 1 is formed by rotating and stacking a plurality of iron core sheets 10 along its axial direction, so that the rotor core 1 can form a winding bevel groove 104, and the winding bevel groove 104 can reduce the magnetic resistance loss. Compared with the straight slot structure, the winding bevel groove 104 can provide a shorter magnetic field conduction path, thereby reducing the static friction of the rotor of the micromotor during operation, thereby improving the operation efficiency and performance of the micromotor.

[0034] like Figure 3 As shown, an angle α is formed between the central axis of the winding chute 104 and the central axis of the shaft hole 100, and the angle range of the angle α is 8-15°. In this embodiment, the angle α is 12°. It should be noted that if the angle α is too large, it will limit the winding layout and design of the enameled wire, causing winding difficulties.

[0035] Furthermore, the core sheet 10 is made of silicon steel, which has a relatively low magnetic permeability, that is, a relatively poor ability to conduct magnetic fields, which helps to reduce eddy current losses in the core sheet 10, thereby improving the efficiency of the motor.

[0036] like Figure 1 and Figure 2As shown, further, the number of the punching teeth 102 of each core sheet 10 is six groups or eight groups. In this embodiment, the number of the punching teeth 102 of the core sheet 10 is six groups. The number of the punching teeth 102 can affect the uniformity of the magnetic field distribution. More punching teeth 102 means more magnetic field paths, which can make the magnetic field more evenly distributed in the core sheet 10, thereby improving the performance and efficiency of the motor.

[0037] Furthermore, the punching yoke 101 and the punching tooth 102 are an integrally formed structure. The integrally formed structure can improve the continuity of the magnetic circuit, and there is no gap or gap between the punching yoke 101 and the punching tooth 102, so the magnetic field is conducted more smoothly in the rotor core 1, reducing magnetic resistance and magnetic field leakage.

[0038] Furthermore, the surface of the rotor core 1 is coated with an insulating paint layer (not shown). The insulating paint layer can form an insulating layer on the surface of the rotor core 1 to prevent current from passing through the rotor core 1, thereby achieving electrical insulation, preventing short circuits and reducing electrical failures, and ensuring the normal operation of the motor.

[0039] like Figure 1 and Figure 2 As shown, further, first transition fillets 105 are respectively provided at both ends of the punching sheet tooth portion 102. The first transition fillets 105 can reduce the sharp angles at both ends of the punching sheet tooth portion 102, so that the magnetic field is transmitted more smoothly in the rotor core 1, and the magnetic resistance loss is reduced; it should be noted that the sharp angles will cause the magnetic field to have a larger magnetic resistance in the rotor core 1, thereby generating energy loss and heat. By setting up the first transition fillets 105, the magnetic field can be transmitted more evenly.

[0040] like Figure 1 and Figure 2 As shown, further, a second transition fillet 106 is provided at the connection between the punching tooth portion 102 and the punching yoke portion 101. The provision of the second transition fillet 106 can improve the mechanical strength and stability of the rotor, reduce stress concentration at sharp corners, improve the connection strength between the punching tooth portion 102 and the punching yoke portion 101, and enhance the overall rigidity and stability of the rotor.

[0041] Furthermore, the thickness of the core sheet 10 is 1-3 mm. In this embodiment, the thickness of the core sheet 10 is 2 mm.

[0042] Furthermore, the width of the winding inclined groove 104 is 1-4 mm. In this embodiment, the width of the winding inclined groove 104 is 3 mm.

[0043] The rotor core 1 of the utility model is formed by rotating and stacking multiple iron core pieces 10 along their axial direction, so that the rotor core 1 can form a winding bevel groove 104, and the winding bevel groove 104 can reduce the magnetic resistance loss. Compared with the straight slot structure, the winding bevel groove 104 can reduce the static friction of the rotor of the micromotor during operation, reduce the loss, and thus improve the operation efficiency and performance of the micromotor; the iron core piece 10 includes a punching yoke portion 101 and a punching tooth portion 102, and the side wall of the punching tooth portion 102 away from the punching yoke portion 101 is provided with a transition arc surface 103. When the magnetic field passes through the transition arc surface 103 on the side wall of the punching tooth portion 102, the path of magnetic field conduction can be made smoother, thereby reducing the resistance to magnetic field conduction, reducing magnetic resistance loss, and effectively improving the operation efficiency of the micromotor.

[0044] As described above, the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A micromotor rotor skew slot structure, characterized in that: The rotor core comprises a rotor core, wherein the rotor core is formed by rotating and stacking a plurality of iron sheets along the axial direction thereof; The core sheet includes a punching sheet yoke and a punching sheet tooth portion, and a plurality of the punching sheet teeth portions are arranged equidistantly along the circumference of the punching sheet yoke portion; The middle part of the punching plate yoke is provided with an axial hole connected to the rotor, the punching plate tooth part is in a T-shaped structure, and the side wall of the punching plate tooth part away from the punching plate yoke is provided with a transition arc surface; A winding skew groove is formed between two adjacent rows of the punching teeth in the rotor core; An angle is formed between the central axis of the winding inclined groove and the central axis of the axial hole, and the angle range of the angle is 8-15°.

2. The micromotor rotor skew slot structure according to claim 1, characterized in that: The angle between the central axis of the winding inclined groove and the central axis of the shaft hole is 12°.

3. The micromotor rotor skew slot structure according to claim 1, characterized in that: The iron core sheet is made of silicon steel.

4. The micromotor rotor skew slot structure according to claim 1, characterized in that: The number of punching teeth of each iron core sheet is six or eight groups.

5. The micromotor rotor skew slot structure according to claim 1, characterized in that: The punching sheet yoke portion and the punching sheet tooth portion are an integrally formed structure.

6. The micromotor rotor skew slot structure according to claim 1, characterized in that: The surface of the rotor core is coated with an insulating paint layer.

7. The micromotor rotor skew slot structure according to claim 1, characterized in that: Both ends of the punching sheet tooth portion are respectively provided with a first transition fillet.

8. The micromotor rotor skew slot structure according to claim 5, characterized in that: A second transition fillet is provided at the junction of the punching sheet tooth portion and the punching sheet yoke portion.

9. The micromotor rotor skew slot structure according to claim 5, characterized in that: The thickness of the iron core sheet is 1-3 mm.

10. The micromotor rotor skew slot structure according to claim 1, characterized in that: The width of the winding inclined groove is 1-4 mm.

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