Various types of electromagnetic stirrer

                         In terms of ac induction method,the basic structure of an electromagnetic stirrer is actually a can stimulate the magnetic field sensor, it is similar to electrical machine’s stator, the molten metal is equal to the rotor. The magnetic field creative by inductor act on the molten metal inside the crystallizer, and have relative movement with the molten metal, the molten metal is electric conductor, so, it will produce induced current in it, the current interact with the magnetic field produce by inductor to produce electromagnetic force, which drive metal fluid movement. The way of movement is determined by the magnetic field, at present, the widespread application of magnetic field are rotating magnetic field and traveling wave magnetic field.                     AC-DC-AC frequency conversion (Four quadrant vector control structure)             1. It can realize nets side unit power factor and sine wave current control. In ideal state double PWM inverter power input current is the input voltage and the same phase sine wave, power factor close to 1, the input current harmonic content is close to zero.           2. PWM converter can run in rectifying and inverter two kinds of state, can achieve energy bidirectional, effective use of renewable energy.           3. With excellent output characteristics, especially fast dynamic response.           4. It is energy efficient, quick adjustment, auto-balance etc. and also can be overcome by the thyristor rectifier of a communication existence fault circulation hidden trouble.                             Electromagnetic stirring technology application can be obtained as follows effect:             1. Can make the melt alloy components uniform. General electromagnetic stirring device (no more than 20 minutes), can the whole furnace of various elements of the aluminium chemical composition of the relative deviation is less than 5%, can satisfy the almost all alloy to composition uniformity of the requirements.             2. The mixing process not destroy the oxidation layer, can reduce the melt hydrogen absorbing and oxygen, ensure the quality of the melt, and reduce the loss (relative value) 20 to 25%.             3. Can make the top and bottom of the melt temperature uniformity. General mixing ten minutes to the limit of the melt temperature can drop to less than 5 °C. So can reduce melting temperature, can improve the melt bottom alloying melting degree, in lower melting again at the same time can reduce the degree of damage.             4. In the process of aluminum ingots re-melting using electromagnetic stirring technology can shorten the time of smelting, improve work efficiency, reduce energy consumption, according to data provided by the already, can reduce energy consumption (improve efficiency) 20 to 30%.             5. No pollution aluminum melting liquid. This has the important meaning for high purity aluminium and the iron control strict alloy.             6. Can reduce the labor intensity, and improve working con.