Cooling system of main bearing mechanism of direct drive generator and direct drive generator

Abstract

The invention discloses a cooling system of a main bearing mechanism of a direct-drive generator and a direct-drive generator. The cooling system of the main bearing mechanism of a direct-drive generator includes: a radiator on the surface of an outer shaft and a cooling fin on the surface of the outer shaft. The radiator on the surface of the outer shaft and the radiator on the surface of the outer shaft are arranged on the side of the outer shaft of the main bearing, wherein the radiator on the surface of the outer shaft communicates with a cooling medium, and the flow rate of the cooling medium of the radiator on the surface of the outer shaft is controlled by The setting is adjustable; the radiator on the surface of the inner shaft and the cooling fin on the surface of the inner shaft are arranged on the side of the inner shaft of the main bearing, wherein the radiator on the surface of the inner shaft A cooling medium is communicated, and the flow rate of the cooling medium of the inner shaft surface radiator is set to be adjustable. The invention can reduce the surface temperature difference between the inner and outer shafts of the main bearing and increase the service life of the bearing.

Description

technical field [0001] The invention relates to a cooling system of a main bearing mechanism of a direct drive generator and a direct drive generator. Background technique [0002] Wind turbines are divided into two types according to the type of drive chain: gearbox-type wind turbines, in which the generator is driven by a speed-increasing gearbox, and direct-drive wind turbines, in which the wind wheel directly drives the generator to generate electricity. [0003] There are two types of main bearings for direct-drive wind turbines: 1. The inner shaft of the main bearing is stationary, and the outer shaft of the main bearing rotates together with the generator rotor and hub; 2. The inner shaft of the main bearing rotates, and the outer shaft of the main bearing is stationary. [0004] Since a large amount of heat will be generated during the operation of the bearing, which will cause the temperature of the bearing to rise and affect the life of the bearing, it is necessary...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the temperature difference between the inner and outer shaft surfaces of the bearing is too large, which seriously affects the normal operation of the bearing, and to provide a cooling system for the main bearing mechanism of a direct drive generator and a direct drive power generation system. machine

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