High-speed dynamic balance driving system and control method for large steam turbine rotor

Abstract

The invention discloses a high-speed dynamic balance driving system for a large steam turbine rotor. The driving system comprises a master motor and a slave motor, wherein the master motor is a motor with double extension shafts, is coaxially connected with the slave motor through a motor shaft at one side of the master motor in series and is connected with an acceleration gearbox through a motor shaft at the other side of the master motor, the acceleration gearbox is connected with the rotor and is connected with a barring gear, the master motor is connected with a master frequency converter, the slave motor is connected with a slave frequency converter, and the master frequency converter and the slave frequency converter are connected with a controller; rotating speed sensors are arranged on the master motor, the slave motor and the rotor and are connected with the controller. The high-speed dynamic balance driving system for the large steam turbine rotor can realize the closed-loop control, effectively improve the accuracy of the high-speed balanced rotating speed of the large steam turbine rotor and increase the acceleration speed of a dynamic balance system. The driving system has the advantages of simple structure, convenient operation, high work efficiency, convenience for repair and maintenance and capability of effectively reducing the test cost.

Description

technical field [0001] The invention relates to the field of steam turbine manufacturing, in particular to a balance drive system for a large steam turbine rotor and a control method for the system. Background technique [0002] The high-speed dynamic balancing of large steam turbine rotors is a key process in the steam turbine manufacturing process. Due to the large load on the rotor of the steam turbine, there are mainly two types of drive systems for steam turbine balance equipment at home and abroad: steam turbine and low-voltage DC drive system. The use of steam turbines for driving generally requires a special boiler to provide steam, which has high energy consumption, low efficiency, and large pollution. In addition, the steam turbine drive uses a steam regulating valve to control the steam, and the entire drive system is an open-loop control, which has poor speed stability, low test repeatability, and cumbersome test process, which will bring many problems to produc...

AI Technical Summary

Problems solved by technology

However, due to the congenital deficiency of the DC motor, there are two major weaknesses in the low-voltage DC drive system. One is that the system is large and complex, the transmission chain is long, and the efficiency of the entire drive system is low; the other is the high failure rate of the system and high maintenance costs. The operating cost of the system is high

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