I have wound an inductor for 1.5mH on ferrite core with 22SWG (0.7mm dia) = copper wire. Inductance is fine as measurement confirmed it. I sent this a= s sample to a professional inductor manufacturer to order some 50 pieces an= d he says that this wire gauge cannot handle more than 1-2A of current wher= e as my requirement is for 5A current. This came as surprise to me as the t= hickness of 22SWG wire is much thicker than the 10A fuses I have seen. What= decides the current carrying capacity of the inductor?=20
For comparision I opened pioneer and kenwood car audio head units that I ha= veat my disposal and they say 4x45W output power. They both have an LC filt= er at input of the power supply and their series inductors are also wound w= ith a 22SWG wire. To deliver 4x45watts per channel and also to cater to oth= er functions including the display the current through the inductor of the = LC filter must be more than 8-9A at car battery voltage of 12-13V. They bot= h have 10A fuse prior to the inductor.=20
Even the SWG/AWG current charts found on the net also says that 22SWG (0.7m= m dia) cannot handle more than 1-2A. Can anybody explain please?
1) How is 22SWG sufficient in these car audio systems from pioneer and kenw= ood that require close to 10A of current? 2) When they say 4X45W of RMS power, it is 180W plus say around 25W for dis= play and operation including CD motors. How are 10A fuse and 12V car batter= y supply sufficient for that wattage? 3) What else decides current carrying capacity of the inductor other than g= auge of the wire?=20-mark