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I really think you should buy a cheap drive rather than try and do this yourself. Also is the Motor rated to operate at 6000rpm? They sometimes do not like to run at above their base speed and can explode.
When I design something like this it's worth noting what the resistor's energy rating is as that is more relevant. You see a direct reflection of the Capacitor energy when you charge it. Saying that I have used NTC thermistors as other correspondents have pointed out.
Regards,
Rob.
It is also very much affected by the ripple current and the frequency of operation of the ripple. When I have designed drives in the past it is important to gauge through simulation the harmonics of the ripple current. Manufacturers can normally give you a lifetime on an ambient operating...
Those decisions will directly affect lifetime of your power supply. You also need to understand what isolation strength you require between the line side and your output rails. You need to decide what lifetime you require from it as a starting point.
When designing anything the spec is everything. The quicker you can get the spec organised and agreed with your customer then the easier it is to develop your solution. Even just having all your parameters written down is a start. Betwixt's list is a good start but it is only a start and your...
The output transformer makes it impossible for DC current to appear at the output if the modulation goes haywire for a start? Sine filtering will also add mass in the form of the filter inductors.
Again my comment earlier about water cooling of the Tank capacitor and the working coil becomes clear...the connecting hoses need to be 'carbon free' for obvious reasons and very clean water with a decent amount of pipe between potentials, like more than 2m.
Silicon carbide FETs are a lot...
Ah ok c_mitra I had missed that detail. In that case you are probably going to have to run this at probably 200kHz if the work piece is very small. This will mean that the coil might end up being a turn or two. Silicon Carbide MOSFETs are ideal for this. I wish they existed when I was developing...
Yes ideally you need isolated gate drives top and bottom and also since you are trying to drive them at was it 100kHz? This will require an appreciable current pulse in order to get them to switch smartly!
When I was doing Induction heating, Aluminium melting Furnaces did run at about 3kHz so you're in the right ballpark. This easily puts you in the operating area for an IGBT. Normally for a melter you aim for a Q of around 10, but because you are melting Al is may be necessary to aim for a higher...
Right I see what you mean now. Can you post your circuit? I've used the UC38xx loads of times but normally the rectified mains runs on the same 0V as the low voltage side, as my background is AC drives. Normally you would regulate off the +5V rail and use other winding(s) for other rails and...
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