Bridge Crane Frequency Transformation And Contrast Test

In order to regulate the bridge crane frequency transformation process, changes in energy consumption, vibration, reliability verification after the transformation, and the transformation to formulate a unified inspection samples for inspection reference. The subject of the main research contents include:The asynchronous motor speed control principle, mechanical properties, and power loss analysis and calculation, the advantages and disadvantages of cutting resistance timing and frequency control, which shows that the current is small, low position, speed impact characteristics and electrical components of low energy consumption, small power loss speed process start frequency.The technical scheme of access to different frequency conversion transformation, with the relevant standards, and according to the requirements of actual usage and demand, develop general plan of frequency conversion.On two sets of the same model with heavy machine unit with the parameters of general overhead traveling crane one implementation of the frequency conversion driving mechanism, design and selection of all electrical components to conduct a comprehensive check according to the reform plan, and formulate the relevant requirements after the inspection frequency transformation of the crane designed scheme.Develop energy efficiency testing scheme, specific energy consumption before and after the comparison test and analysis of crane frequency transformation, harmonics, power factor, frequency conversion start current and other parameters before and after the conversion, to understand the influence of crane on the grid condition.Differences in the amplitude of vibration acceleration, the contrast test of frequency conversion and validation of crane, crane at rated load under dynamic stiffness.Making use of fault tracking scheme, accurate comparison of reliability analysis of relevant indicators before and after the crane.Through the contrast test in terms of energy consumption, vibration and failure rate before and after the bridge crane frequency transformation, suggest the use of general purpose inverter crane is not ideal in a single operating mode energy-saving, but frequency relative tothe rotor series resistance speed can greatly improve the power factor of the grid and reduce the starting current, impact and reduce the main structure of the external load, improve the service life of crane; greatly reduce the failure rate, reduce the wear and tear of the main parts and failure, improve operation security and stability has a positive role.