Hybrid Excitation Turbo Generator with Multi-stage Axial-Centrifugal Ventilation and Cooling System

Abstract

The invention discloses a hybrid excitation turbogenerator with a multistage axial flow-centrifugal ventilation and cooling system, which relates to the field of motors. In order to solve the problems of low power density and high component temperature of the existing turbogenerators, the present invention installs stator core sections with different thicknesses along the axial direction, and radial ventilation grooves are left between the stator core sections. There are axial ventilation holes on the stator yoke and axial ventilation holes on the stator teeth. The multi-stage axial flow-centrifugal hybrid fan is installed on one side of the turbogenerator. The outer surface of the rotor core is provided with fan-shaped grooves and rectangular deep holes. Slots, high-coercivity permanent magnets and low-coercivity permanent magnets are installed in fan-shaped grooves, rotor excitation windings are installed in rectangular deep grooves, rotor internal cooling ventilation channels are opened in rotor excitation windings, and rotor excitation windings are opened below There is a ventilation channel at the bottom of the rotor groove, and an axial ventilation hole of the rotor core is opened under the fan-shaped groove. The invention improves the power density and cooling effect of the generator, has a simple structure and is easy to realize.

Description

Technical field: [0001] The invention relates to a hybrid excitation steam turbine generator with a multi-stage axial flow-centrifugal ventilation cooling system, belonging to the field of electric motors. Background technique: [0002] With the rapid development of the national economy, electric energy has become one of the important power sources and material foundations necessary for social development and residents' life. The capacity of the turbo-generator, the core equipment in a large-scale power station, is relatively large. The traditional turbo-generator only uses the excitation winding to apply the excitation current to generate the magnetic field in the generator, which leads to the low power density of the turbo-generator and the The axial length of the turbogenerator is long, and the temperature difference in the axial direction will lead to large thermal stress and thermal deformation of the stator winding in the axial direction, which directly affects the ser...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a hybrid excitation turbogenerator with a multi-stage axial flow-centrifugal ventilation and cooling system to solve the problems caused by the low power density of the traditional turbogenerator and the unreasonable ventilation design of the stator area and the rotor area. Iron core, stator winding, rotor core, rotor excitation winding and end components are overheated, which significantly improves the power density of the turbogenerator and reduces the volume of the turbogenerator. Through multi-stage axial flow - The design of the centrifugal ventilation cooling system can effectively improve the utilization rate of cooling gas, increase the flow and pressure of cooling gas in the turbogenerator, reduce the temperature of each component and the temperature difference in the axial direction, and improve the power generation of the turbogenerator. Ability to operate safely and stably

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