Research On The Effects Of Composition And Structure On The Magnetic Of Claw Pole Steel

The component and structure of steel for generator claw pole vary differently here andaboard, causing quite bigger differences of generating capacity between those generatorsalready made. Domestic claw pole is always with poor quality, and the high-quality claw poleis depended on importing basically. Few research works can be found domestically for thestudy on component and structure of the claw pole. The effects are mainly inclined to theresearch for forging technology, designing, thermal treatment of claw pole, etc. So, this articleintends to research how the claw pole material with different component and structure canaffect their magnetic performance.This article analyzes the component, structure, texture, magnetism of claw pole materialhere and aboard, and its corresponding relationship with generation performance. And then itcaptures some data of foreign claw pole component and add different trace elements inside,producing the needed sample by proper thermal treatment, observing the metallurgicalstructure, testing the magnetic performance, ensuring the dosage of these elements to beadded. Finally smelt the new claw pole material based on above analysis data, forging thesemi-finished product in appropriate size, sending it to the smelting plant for claw poleproduction, and installing the generator with the claw pole and test its generationperformance.To sum up the findings of different claw pole steels here and aboard, it shows that thereare no unified rules to follow with between the generation performance and the steel’scomponent, structure, magnetism.The research achieved that the increasing of C content among0.015%~0.029%canimprove the magnetism of carbon steel; the increasing of Si, Cr, Ni, Cu inside the steel allrestrained the variety rules of carbon steel magnetism. It’s confirmed that the right content forgetting higher magnetism of carbon steel is: C:0.02%~0.03%, Si<0.05%, Cr<0.1%, Ni<0.05%,Cu<0.11%.Researches found that while the content ratio C/Si=0.75, C/Si=1, C/Si=1.25, the meansize and evenness degree of those crystal practices can affect the magnetism of carbon steel.The smaller crystal practice size, the greater coercive force; the better evenness degree ofcrystal practices, the higher saturation induction density. It shows that under the condition ofC/Si≈0.75, pure-ferritic steel structure, crystal practices with fine sizes and evenness degree,the best magnetism of carbon steel can be achieved accordingly.The results show that the claw pole material with quite good magnetism can be only oneof those conditions to get fine generation capacity.