Outer rotor permanent magnet motor for cooling fan of direct-cooled thermal power plant

Abstract

The invention provides an outer rotor permanent magnet rotor for a cooling fan of a direct-cooled thermal power plant. An outer rotor permanent magnet motor type is used for the motor. Vertical mounting and stator fixation are performed. Fan blades are connected with outside of the rotor, and furthermore can be arranged at random portions on outer side of the rotor along an axial direction according to an actual working condition requirement. The stator has a hollow structure and is internally provided with heat radiating fins. The motor can be cooled in a manner of natural cooling or fixing the cooling fan at the inner part. The motor of the cooling fan can be an outer rotor structured motor or an inner rotor structured motor. The motor of the cooling fan can operate in a constant rotating speed, and furthermore the rotating speed of the motor can be automatically adjusted according to an actual working condition, thereby realizing intelligent control. A wiring box is fixed at the top part of the stator.

Description

technical field [0001] The invention relates to a cooling fan system for a direct cooling thermal power plant, in particular to an outer rotor permanent magnet motor. Background technique [0002] Direct air cooling system, also known as air cooling system, is a thermal power plant cooling technology aimed at saving water. It is a cooling method that uses air instead of water as the cooling medium. The device uses air to condense, and the air and steam perform heat exchange. The required cooling air is usually supplied by mechanical ventilation, and the condensed water is discharged into the heat recovery system of the steam turbine unit by the condensed water pump. The air cooling system is an important part of the safe and economical operation of the turbogenerator set in a power plant. It can operate automatically, quickly and efficiently, and the operation process has no pollution to the environment. The cooling fan system is an important part of the air cooling system ...

AI Technical Summary

Problems solved by technology

[0003] At present, the driving motor used in the cooling fan system of the known direct-cooling thermal power plant is a vertical asynchronous motor. The high-speed operation of the asynchronous motor shortens the life of the bearing to a certain extent. However, the fan system of the direct cooling thermal power plant will adjust the fan blade speed at any time according to the season and weather changes, and the overall efficiency of the asynchronous motor is low under this working condition

In order to match the speed requirements of the fan blades, the asynchronous motor must be decelerated by the reducer to drive the fan blades. The use of the reducer reduces the overall efficiency of the entire cooling fan system, and because the reducer itself has a high failure rate and a large amount of maintenance, maintenance Problems such as high cost and long maintenance cycle have greatly reduced the overall performance of the traditional cooling fan system

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