Study On The Energy-Saving Technology For Motors Based On Heat Conduction And Dissipation And Its Applications

Motor as the main power consumption equipment in the national economy,running or not,the most important index is the degree of heat of the motor.Heat of the motor is mainly generated in the stator and rotor part.Heat of the stator part is transmitted through the shell directly.However,low heat transfer efficiency of the rotor in a relatively closed environment results in producing heat accumulation,which not only reduces the motor ability of the work,but also makes motor life greatly reduced.Therefore,heat dissipated from the rotor is the bottleneck for the motor cooling.For the motor working in a closed environment,such as explosion-proof motors,textile machinery special motors,heat dissipated from the rotor is more necessary.Heat pipe is a thermally conductive element which works on its own internal liquid phase change to achieve heat transfer.As a result of the gas-liquid phase change and heat transfer of the working liquid inside the heat pipe,thermal resistance is very small.Therefore,heat pipe has high efficient heat transfer characteristics and superiority of isothermal.In this thesis,heat pipe is installed in the motor rotor to enhance the heat conduction and dissipation of the rotor to ensure motor's reliability and economy in the running process.This will extend the life of the motor,improve the efficiency of motor output,and realize the purpose of saving energy and reducing consumption.The following work has been carried out:(1)The deep hole of the rotor is manufactured and the heat pipe is embedded into the deep hole of the rotor through interference fit connection to ensure that the heat pipe wall contacts with the inner hole of the rotor closely.A cooling device is designed to ensure that heat pipe fully conducts heat from the motor.(2)Mechanical properties of the rotor axis are changed,when deep hole is processed in motor rotor.The changes of mechanical properties of the motor rotor after the deep hole processing is analyzed with the finite element method.The FEA(finite element analysis)model of interference fit between heat pipe and the motor rotor is built,and effects of static and dynamic performance with interference,friction factor and matched length are analyzed.Furthermore,on the basis of the FEA,multi-objective optimization is taken to analyze the normal maximum contact stress of interference fit between heat pipe and the motor rotor.The minimum contact state of maximum normal contact stress on the heat pipe and the rotor are found,which improves the reliability of fit between heat pipe and motor rotor's hole and service life of motor rotor.(3)A new type of energy-saving motor is designed using heat pipe which has excellent heat transfer characteristics to improve the motor cooling.The performances of energy-saving motor is tested through the EM-? motor integrated test system,and experiment data show that the motor with heat pipe is more efficient and has better energy-saving characteristic.(4)We apply the improved energy-saving motor to the spinning frames,which has been used in textile industry on a large scale to verify the efficiency of energy saving motor through the field test and explore energy-saving technology which might be implemented towards the spinning frames.