Electromagnetic Design And Research Of Vibration Of 11kw Induction Motor For Escalator

With the sustained and rapid development of China's economy,the city's large-scale shopping malls and rail transit stations are booming,and the user's demand for convenience has increased,resulting in a gradual increase in elevator configuration density.As the core power component of the escalator,the traction motor needs to meet the requirements of medium and low speed,high torque,good starting performance and low vibration noise.To this end,combined with the above design requirements,a traction motor with three-phase asynchronous motor as the escalator was designed and its performance was studied.The specific research contents are as follows:Firstly,the research background and significance of the subject are expounded,and the research status of traction motors at home and abroad is analyzed.For the escalator,starting from the starting performance,loss characteristics and vibration and noise performance,the overall scheme of the electromagnetic design of the traction three-phase asynchronous motor is determined.Two types of rotor slotted structural designs were chosen and compared with multiple electrical properties to select a rotor slot that is more suitable for this condition.Secondly,two kinds of rotor slot type motor Maxwell models are established,and the electrical performance of the two motor models is compared.The influence of the rotor slot type on the loss characteristics of the motor and the starting performance is analyzed.The analysis results show that the rotor blade groove can produce more obvious skin effect,and the skin effect of the rotor resistance and inductance during the starting process can be used to reduce the starting current and improve the starting torque.Starting performance and can effectively reduce losses.Then,without sacrificing other electrical properties,the blade rotor groove was selected as the groove type of the traction motor.According to the electromagnetic field correlation theory,the finite element analysis method is used to obtain the radial air gap magnetic density and electromagnetic force amplitude of the motor.On this basis,the natural mode of the stator system of the motor is studied,and the electromagnetic force is directly coupled with the stator mode.The influence of the radial electromagnetic force on the electromagnetic vibration of the motor is analyzed.Studies have shown that electromagnetic forces with low spatial ratio and frequency close to the natural frequency of the stator system can cause strong electromagnetic vibration.Finally,a 11 kW stator-rotor groove was prototyped to fit the 54/42knife-type rotor groove prototype to verify the theoretical analysis and the accuracy of the finite element simulation model.The prototype was tested using the three-phase asynchronous motor test method in GB/T 1032-2012.The motor was tested for loss characteristics,temperature rise,starting performance,vibration and noise performance.The experimental data effectively verified the correctness of theory and simulation.