Permanent magnet synchronous motor for hoisting mechanism of direct-drive crane

Abstract

The invention discloses a permanent magnet synchronous motor for a hoisting mechanism of a direct-drive crane; the permanent magnet synchronous motor comprises a permanent magnet synchronous motor shell, a stator winding, a stator iron core, a permanent magnet, a rotor, a winding drum revolving shaft and a winding drum; and the permanent magnet synchronous motor has more than 20 poles. In the invention, by increasing the number of the poles of the permanent magnet motor, a variable-frequency power source is adopted to realize low-speed operation of the motor, high torque is output, the motor directly drives the load to work, a speed reducer is canceled, the structure is simple and practical, and the working efficiency of the system is improved; a rotor structure adopted by the invention can effectively solve the problem of difficult assembly of the permanent magnet motor; rotor magnetic poles and magnetic separation steel rings commonly protect the permanent magnet from being damaged when in assembly; reluctance torque is reduced to be zero in the installation process, the installation difficulty is reduced, and requirements and dependence to installation tools (special mounting equipment) is reduced, and the quality of the rotor and the complexity of the rotor structure are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a permanent magnet synchronous motor for a hoisting mechanism of a direct-drive crane. Background technique [0002] As a typical mechanical and electrical equipment, the crane lifting mechanism is responsible for the important task of lifting various items and moving. It is the main core component of the crane, so the motor is its "heart" part, that is, the power source part. [0003] At present, the motor drive system mainly used in the hoisting mechanism of the crane can be divided into the following three categories: [0004] 1. Three-phase asynchronous AC motor drive system This is the first stage of the development of electric drive for crane hoisting mechanisms. Ordinary three-phase asynchronous AC motors meet the requirements of crane lifting through measures such as coupling, transmission rod, and deceleration of the reducer. The performance and requirements of the orga...

AI Technical Summary

Problems solved by technology

[0010] In order to overcome the problems of high cost (such as the existence of a reducer), low efficiency, and difficult maintenance of the above-mentioned existing crane lifting mechanism drag system, the present invention provides a permanent magnet synchronous motor for a direct drive crane lifting mechanism. Realize the low-speed operation of the motor, output a large torque, directly drive the load to work, greatly reduce the cost (eliminate the reducer and a series of other transmission mechanisms), improve the system work efficiency, and enhance the reliability of the system operation. maintenance difficulty

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