Integrally-formed rotor

Abstract

The utility model relates to the technical field of stepping motors, and discloses an integrally formed rotor, which comprises a magnet piece and a rotating shaft, the magnet piece is annularly arranged, the rotating shaft is inserted into the magnet piece, the rotating shaft and the magnet piece are integrally injection-molded, the rotating shaft and the magnet piece are coaxially arranged, and the rotating shaft and the magnet piece are integrally injection-molded. And an injection molding part is formed between the inner wall of the magnet part and the outer circumferential wall of the rotating shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of stepper motors, in particular to an integrally formed rotor. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy to obtain power. The main components of a motor are the stator and the rotor. According to the relative position of the rotor and the stator, the motor is divided into an outer rotor motor and an inner rotor motor. The rotor of an inner rotor motor is surrounded by the stator, that is, the rotor is inside.

[0003] The existing inner rotor mainly adopts a split structure, and its assembly is mainly glued. Directly gluing the magnet and the shaft will result in low concentricity and precision of the assembled inner rotor, which will cause rotational imbalance during rotation. The existing technology first installs a cover on both end surfaces of the magnet, and then installs the shaft at the center hole of the cover, so that the shaft is adhered to the center of the magnet. Since the operator needs to concentrically adhere the cover to both ends of the magnet after each part is produced, the installation process is relatively cumbersome and requires a large number of operators. In view of this, researchers in this field have designed an integrated rotor. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an integrally formed rotor which simplifies the processing technology and improves the assembly efficiency.

[0005] The technical solution of the utility model is: an integrally formed rotor, comprising a magnet part and a rotating shaft, the magnet part is arranged in a ring shape, the rotating shaft is inserted in the magnet part and is integrally injection molded with the magnet part, the rotating shaft and the magnet part are arranged coaxially, and an injection molded part is formed between the inner wall of the magnet part and the outer circumferential wall of the rotating shaft.

[0006] It can be seen from the above scheme that the rotating shaft is inserted into the inner ring of the magnet part, and the coaxial setting is used to ensure the concentricity of the inner rotor and achieve the processing accuracy of the parts. The rotor is an inner rotor, and the injection molded part is molded by the molten plastic. The injection molded part is molded on the magnet part and also on the rotating shaft, which is used to fix the rotating shaft at the central axis of the magnet part to achieve a fixed connection between the rotating shaft and the magnet part. When the rotating shaft rotates, it drives the magnet part to achieve coaxial rotation.

[0007] The two ends of the rotating shaft extend out of the magnet part. It can be seen that the magnet part is sleeved on the middle part of the rotating shaft.

[0008] The outer circumference of the middle part of the rotating shaft is provided with knurling. It can be seen that the knurling on the outer surface of the connecting part is used to increase the friction between the inner wall of the magnet part to achieve anti-slip, and is used for the injection molded part to fix the rotating shaft more tightly during injection molding.

[0009] The injection molded part is provided with a weight-reducing hole, which is used to reduce the weight of the inner rotor after injection molding, ensuring that the weight of the shaft and the magnet after combination is the same as the weight of the original structure, and is suitable for the assembly of various products. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model;

[0011] Figure 2 It is a cross-sectional view of the utility model;

[0012] Figure 3 It is a side view of the utility model. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] like Figures 1 to 3 As shown, the utility model is an integrally formed rotor, including a magnet part 1 and a rotating shaft 2, wherein the magnet part 1 is arranged in an annular shape, the diameter of the rotating shaft 2 is smaller than the inner ring diameter of the magnet part 1, the rotating shaft 2 is inserted in the magnet part 1 and is integrally injection molded with the magnet part 1, the rotating shaft 2 is arranged coaxially with the magnet part 1, an injection molded part 3 is formed between the inner wall of the magnet part 1 and the outer circumferential wall of the rotating shaft 2, and the injection molded part 3 is formed by injection molding of molten plastic 3. In this embodiment, the rotor structure formed by the magnet part 1 and the rotating shaft 2 is an inner rotor, and a weight reduction hole 31 is provided on the injection molded part 3.

[0015] The two ends of the rotating shaft 2 extend out of the magnet part 1, and a knurling 21 is provided on the outer circumferential surface of the middle part of the rotating shaft 2. In this embodiment, the rotating shaft 2 is inserted into the magnet part 1 and extends out at both ends, and the knurling 21 is provided at the joint position of the rotating shaft and the injection molded part. The knurling 21 is a mechanical process of rolling patterns on the surface of the workpiece, which is mainly used for anti-slip and makes the connection tighter. The injection molded part 3 is provided with weight-reducing holes, and the weight-reducing holes 31 are irregularly arranged in the injection molded part 3.

[0016] The working process of the utility model is as follows: molten plastic 3 is injected into the inner ring of the magnet part 1 by an injection molding machine, and the rotating shaft 2 is inserted in the center of the injection mold, so that the rotating shaft 2 is integrally injection-molded at the central axis of the magnet part 1, so that the rotating shaft 2 and the magnet part 1 are fixedly connected by the injection molded part 3, completing an inner rotor processing and molding process, simplifying the assembly process, reducing the requirements for personnel, and improving processing efficiency.

[0017] Finally, it should be emphasized that the above is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An integrally formed rotor, comprising a magnet (1) and a rotating shaft (2), characterized in that: The magnet part (1) is arranged in a ring shape, the rotating shaft (2) is inserted into the magnet part (1) and is integrally injection-molded with the magnet part (1), the rotating shaft (2) and the magnet part (1) are arranged coaxially, and an injection-molded part (3) is provided between the inner wall of the magnet part (1) and the outer circumferential wall of the rotating shaft (2).

2. The one-piece rotor according to claim 1, characterized in that: Both ends of the rotating shaft (2) extend out of the magnet part (1).

3. The one-piece rotor according to claim 1, characterized in that: The outer circumferential surface of the middle portion of the rotating shaft (2) is provided with knurling (21).

4. The one-piece rotor according to claim 1, characterized in that: The injection molded part (3) is provided with a weight-reducing hole (31).

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