Permanent magnet synchronous motor and cambered rotor structure thereof

Abstract

The invention discloses a permanent magnet synchronous motor and a cambered rotor structure thereof. The cambered rotor structure has a rotor core of which each pole is provided with at least two permanent magnets and magnetic isolation bridges. Mounting holes in a number which corresponds to that of the permanent magnets are formed on the rotor core, and are used for arranging the permanent magnets. Reinforcing ribs are formed on the parts, between every two adjacent mounting holes, of the rotor core. The permanent magnets in each pole are arranged to form a cambered shape of which an opening faces the center of the rotor core. The reinforcing ribs are formed between the permanent magnets in each pole of the rotor structure, and bear centrifugal forces produced by the mass of the rotor core and the mass of each permanent magnet, so that the influence of the centrifugal forces on the strength of the magnetic isolation bridge is reduced; moreover, the reinforcing ribs have magnetic isolation effects.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a permanent magnet synchronous motor and its arc-shaped rotor structure. Background technique [0002] With the gradual maturity of the development and control technology of permanent magnet synchronous motors, and the continuous development of permanent magnets in terms of performance and industrialization, there is increasing interest and demand for permanent magnet synchronous motors in various fields, especially permanent magnet synchronous variable frequency speed control motors. bigger. At present, permanent magnet synchronous motors are widely used in various servo motors, wind power generation fields, oil drilling and electric vehicle drive motors, etc. [0003] The permanent magnet synchronous motor includes a stator structure, a rotor structure and a rotating shaft, and the rotating shaft drives the rotor structure to rotate. Each pole of the rotor core is equipped wit...

AI Technical Summary

Problems solved by technology

[0004] However, the existing rotor structure has the following technical problems: the centrifugal force caused by the mass of the permanent magnet and the rotor core itself will act on the magnetic isolation bridge, and the magnetic isolation bridge needs to bear relatively large pressure, which affects the strength of the magnetic isolation bridge , and thus cannot meet the electromagnetic performance requirements of the motor, and the rotor structure of the traditional structure also has problems such as poor manufacturability and low installation efficiency of permanent magnets.

Especially when the power of the motor is large, such as above 100kW, and the speed is also high, such as the permanent magnet synchronous motor application field above 1000r / min, such as the permanent magnet direct drive field of the central air-conditioning compressor, the centrifugal force of the permanent magnet and the rotor core has an effect on the isolation The influence of the magnetic bridge is more obvious, and it is more difficult to meet the requirements with the traditional rotor magnetic circuit structure

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