Rotor core and high-efficiency frequency conversion speed regulating permanent magnet synchronous motor

Abstract

The invention discloses a rotor core and a high-efficiency frequency conversion speed regulating permanent magnet synchronous motor. The rotor core comprises a core body and a plurality of N pole and S pole permanent magnet magnetic steels, wherein 2n magnetic steel slot groups are uniformly distributed on the outer surface of the core body around the center, wherein n is a positive integer; a homopolar permanent magnet magnetic steel is arranged in each magnetic steel slot in the same group; and the permanent magnetic steels between every two groups are sequentially and are alternatively arranged according to the S pole and N pole. The rotor core disclosed by the invention has the characteristics of high strength, material economization, simple manufacturing process and the like. The high-efficiency frequency conversion speed regulating permanent magnet synchronous motor disclosed by the invention has the characteristics of simple structure, high reliability, high efficiency, low cost and the like.

Description

technical field [0001] The invention relates to a permanent magnet rotor core, in particular to a rotor core and a high-efficiency variable-frequency speed-regulating permanent magnet synchronous motor with the rotor core. Background technique [0002] With the rapid development of permanent magnet materials and electronic power technology, permanent magnet synchronous motors are widely used in daily life and in various fields of industry and agriculture, and rational design, manufacture and application of permanent magnet synchronous motors have become an inevitable trend in the development of motors. As we all know, permanent magnet motors have obvious efficiency advantages compared with traditional ordinary induction motors. However, due to the particularity of the characteristics of permanent magnet materials used in permanent magnet motors, the selection of permanent magnet materials, the design of magnetic circuit structures and the fixing of permanent magnet materi...

AI Technical Summary

Problems solved by technology

[0007] 1. The assembly and positioning of the permanent magnet 1′ is difficult: in the assembly process of the permanent magnet 1′ magnetic steel, it is necessary to pre-position the position of the magnetic steel with the help of tooling, and then apply glue evenly, and then cancel the tooling after affixing the magnetic steel according to the law , and some will add fixed blocks, etc., the assembly process will be elongated and difficult

At the same time, the surface-mounted rotor structure requires a very strict design of the magnetic circuit and guarantees the relevant dimensions. If the machining accuracy of the parts is low, the performance of the motor will be greatly affected

[0008] 2. The reliability of permanent magnets is poor: the NdFeB magnets commonly used at present are very easy to oxidize materials, while the surface-mounted magnets are a completely exposed structure, which is easily oxidized by smoke, humidity and other factors. It has an impact on its performance, especially in permanent magnet motors with a low protection level and a relatively harsh environment, the possibility of oxidation of the permanent magnet 1' will increase, reducing the service life

[0009] 3. Low strength, not suitable for high-speed operation: There are some problems in this way of fixing with glue, such as the uniformity of the glue and whether the bonding strength of the glue can completely ensure that the magnetic steel and the yoke will not fall off, etc. It brings risks to the strength of the rotor, especially in high-speed rotating or high-torque motors, the risk factor of this structure is further increased

[0011] like figure 2 As shown, the embedded structure is slotted in the iron core body 2′ formed by superimposed rotor punches and then inserted into the permanent magnet 1′ magnetic steel, and is designed as a one-pole structure. This type of rotor has high structural strength and permanent magnets 1' has high safety, but because the magnetic steel is built into the rotor punched iron core body 2', the distance between the rotor permanent magnet 1' and the stator core is too large, the material utilization rate is low, and it is difficult to obtain high air flux Density, for the whole machine, more materials are needed to make up for the performance, which is not economical, especially in permanent magnet motors with a small number of poles.

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