Permanent-magnet rotor with embedded magnetic steels

Abstract

A permanent-magnet rotor with embedded magnetic steels comprises a rotor core sleeved on a rotor shaft. The magnetic steels are inserted on the rotor core, balancing rings sleeved on the rotor shaft are arranged beside the rotor core and made of non-magnetic conductive materials, an inner ring and an outer ring are arranged on one side of each balancing ring, each inner ring is connected with the corresponding outer ring through more than two reinforcing ribs, counter bores are arranged between each two adjacent reinforcing ribs, each outer ring is provided with more than two uniformly distributed and projecting petal blocks, more than one projecting positioning boss is arranged at the other end of each balancing ring, corresponding positioning holes are arranged on the rotor core, the positioning bosses are inserted into the positioning holes, more than one projecting boss is further arranged at the other end of each balancing ring and arranged on the end faces of the magnetic steels by means of pressure welding, and the number of the bosses is not less than that of the magnetic steels. The permanent-magnet rotor with the embedded magnetic steels has the advantages of simple and reasonable structure, axial fixing reliability of the magnetic steels, low electromagnetic vibration and noise, low temperature rise and less electromagnetic material consumption.

Description

technical field [0001] The invention relates to a permanent magnet rotor, in particular to a permanent magnet rotor embedded in magnetic steel. Background technique [0002] The permanent magnet rotor 1 embedded in traditional magnetic steel, as attached figure 1 As shown, it consists of a rotor shaft 11, a rotor core 12, a magnet 13 and a fixative 14. The rotor core 12 is provided with an installation hole 121 for installing the magnet, and there is a gap between the installation hole 121 and the magnet 13. In cooperation, the fixing agent 14 is coated in the gap between the magnetic steel 13 and the installation hole 121 , and the magnetic steel 13 and the rotor core 12 are fixed together when the fixing agent 14 is cured. [0003] This kind of permanent magnet rotor embedded in magnetic steel has the following three disadvantages: 1) The rotor has no special parts for dynamic balancing. When the rotor is dynamically balanced, only the outer circle of the rotor core can b...

AI Technical Summary

Problems solved by technology

[0003] This kind of permanent magnet rotor embedded in magnetic steel has the following three disadvantages: 1) The rotor has no special parts for dynamic balancing. When the rotor is dynamically balanced, only the outer circle of the rotor core can be milled, or the end face of the rotor core can be milled. Drilling, and these solutions will change the magnetic circuit of the motor, resulting in an imbalance in the magnetic circuit, causing electromagnetic vibration and electromagnetic noise; In occasions with strict temperature rise requirements, it will lead to an increase in the amount of electromagnetic materials; 3) Affected by the assembly process and working environment, the fixing agent has the risk of failure, and the axial fixing method of the magnetic steel is unreliable, which may loosen and cause the motor to fail

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