Design And Analysis Of Mining Flameproof All-in-One Motor With Frequency Converter

Due to the coal mine mining working face conditions, channel narrow, low mining height and large equipment to the well, shortage of tools, production equipment transportation, installation, maintenance difficulties, therefore, requires production equipment to meet the small volume, light weight, low system failure rate, low electromagnetic interference, less energy consumption, low system cost, to reduce the maintenance difficulty and the cost of production. Thanks to have soft start function, low system failure rate, the advantages of low energy consumption, low cost of system maintenance, variable frequency speed regulation system in recent years been promoted; The latest development of it is mine flameproof one-piece motor with variable frequency drive (VFD). With the continuous development and improvement of frequency control of motor drive technology, mine variable frequency speed regulation system is rapidly towards the frequency conversion machine high voltage, large capacity development.But after the inverter and motor integrated into one-piece products, there are still some difficulties on structure design, such as heating components integrated together, can cause the heat source of complex frequency conversion machine, cooling condition deteriorated, plus flameproof frequency converter and the motor’s original sealed, poor heat dissipation characteristics, makes the rise of temperature of the all-in-one particularly prominent problems, must be attention. Therefore, study the temperature distribution of frequency conversion machine is critical, need to adopt the feasible design method to ensure that each part of the frequency conversion machine temperature within acceptable range. Mining flameproof frequency control of motor speed, however, the temperature of the all-in-one calculation method in the domestic research is still blank, it is necessary for mining flameproof frequency control of motor speed all-in-one conduct the thorough research to the calculation method of the temperature.The purpose of this article is 3300 v,1200 kw mining flameproof frequency control of motor speed camera as the prototype, the frequency conversion machine each part of the finite element method to calculate the temperature field, and try to avoid the complicated and tedious theoretical derivation and a large number of laboratory test, to make it more suitable for promotion within the factory.At first, this paper simply describes the design principle of motor, frequency converter and the main structure and performance parameters of the VFD motor, and then, as a foreshadowing for the frequency control of motor speed all-in-one field-circuit coupled transient electromagnetic field simulation, fluid - thermal coupling simulation, obtain the motor parts of each part of the heat source heat and all-in-one coefficient of heat transfer, the final steady state thermal analysis, to obtain temperature field distribution of each part of the frequency control of motor speed machine.According to the type of prototype test results, each observation point method of measuring temperature and the actual analysis of the calculated temperature close to, proved that the method is feasible and effective. Before the new design method appear, the design method of one-piece motor and temperature field within the plant design has a certain reference value.