Motor rotor

Abstract

A motor rotor comprises a rotating shaft, at least one coupling part and a plastic magnet. The outside of the rotating shaft is provided with a combination portion. The coupling part is provided with a combination hole for the rotating shaft to penetrate and is combined with the combination portion of the rotating shaft in tight combination fit. The plastic magnetic wraps the rotating shaft and the coupling part in an injection moulding type. Therefore, the coupling part can guarantee that the plastic magnet does not fall off the rotating shaft, thereby having a stable and firm combination effect, simplifying the whole structure and facilitating assembly.

Description

technical field [0001] The invention relates to a motor rotor, in particular to a rotor structure of an inner rotor motor. Background technique [0002] Currently, the common motor structures in the market can be roughly divided into outer rotor motors and inner rotor motors. Compared with inner rotor motors, outer rotor motors generally have problems such as poorer rotation stability. Therefore, under the premise that electronic products are generally developed and designed in the direction of high speed, functional integration and miniaturization, compared with external rotor motors, inner rotor motors can better meet the heat dissipation requirements of the aforementioned electronic products. [0003] The rotors of existing internal rotor motors can be roughly divided into the following types: [0004] Please refer to figure 1 As shown, the rotor 5 of the first existing internal rotor motor is disclosed. The rotor 5 generally includes a rotating shaft 51 and a magnet 52...

AI Technical Summary

Problems solved by technology

Although the existing rotor 8 can ensure better bonding stability between the rotating shaft 81 and the plastic magnet 82; however, the rotor 8 still has to be additionally processed to form the positioning portion 811 on the outer peripheral surface of the rotating shaft 81, Cause this existing rotor 8 many inconveniences in making molding, moreover, also because the positioning part 811 that this rotating shaft 81 forms can provide the area that this plastic magnet 82 combines is still quite limited, cause this plastic magnet 82 and this rotating The combination of shaft 81 is not stable

[0008] Please refer to Figure 5 As shown, the Chinese Patent No. CN201118294 "Motor Rotor" invention patent case discloses the rotor 9 of the fifth existing inner rotor motor. The rotor 9 includes a magnetic hub 91, a coupling 92 and a shaft 93, mainly Put the magnetic hub 91 and the shaft 93 into a mold for injection molding, first form the joint 92 integrated with the shaft 93, and synchronously form the magnetic hub 91 and the joint 92 integrally, so that the magnetic The hub 91, the joint 92 and the shaft 93 are less likely to loosen; however, when the rotor 9 rotates at a high speed, the joint 92 is easily overheated and deformed, which may cause poor rotation balance of the rotor 9 , will also cause the magnetic hub 91, the joint 92 and the shaft rod 93 to still be loose and so on. Therefore, the overall joint stability of the existing rotor 9 is still not good.

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