Recent content by bamitsram

While you have it open put some kind of temperature sensor in there, even if it is just one of the cheap stand along eBay modules with cable sensor. That way there is no guessing about temperature

SMD FETs are fine, but you run into routing issues, heatsinking issues and board space issues much sooner than with through hole FETs, these 3 things alone make using SMD FETs pretty impractical without taking anything else into consideration.

You'd want your combined rise and fall times to be less than 1% of the switching period, or 500ns. I wouldn't increase the gate resistor more than 20~ ohms otherwise it will take a long time to enhance the MOSFET for good rdson, if you do use 20ohms I suggest you parallel if with a diode for...

I think if you put one of the two big caps up the other end of the PCB and ran fat traces/copper to it it would help significantly

Slowing rise time shouldn't hurt efficiency, the load is inductive so its current shouldn't be able to rise instantaneously. To fix up the fall time you can put a diode in parallel with the resistor to turn off fast, so there isn't a loss in efficiency with the current flow. Voltage rating...

On a design like yours, if you have decent bulk capacitance, you might just be able to tweak the series gate resistors to slow the rise time a tad to cut out the ringing, rather than adding snubbers, otherwise a film cap of 1-2u would probably be enough

I think stop test when the temperature stops rising by less than 3 degrees c/minute or the case hits 65 degrees c (that is the temp where a skin burn will occur in 1-4 seconds), any temp higher than that is unacceptable on the case.

Yeah, less work and less waste to do it that way - plus, people might put different connectors or signals on different cables and would have to redo connectors anyway

Since everyone has different connectors on their existing setup, and some people have minimal connectors, I was going to have bare phase and battery wires leaving, so people could put their own connectors on. For I/O connectors I was going to use a SP16 style weatherproof aviation connector, and...

Do you have a external pullup or larger than default capacitor on the NRST pin? This can cause issues with not resetting/starting up correctly

Schematics done, doing the last bits of layout at the moment. Approximate dimensions are to fit a 15 Fet green time/xld controller case, so 168mm long, 73mm wide, max component height 25mm. I do plan on releasing all of the design files. No, I am using Altium, its what I use in my day job and...

Hey there Shaman, this is bgdwiepp from the VESC project forum, sorry for my absence over christmas/new years, spent quite a bit of time with family, but now I'm back at work I have more thinking time. I've been going through the design and replacing components and circuits with generic...

It is true, coreless motors have near 0 hysteresis loss because of the air "core", however, eddy current losses at high powers are huge because of the high commutation speed, unless wound with litz wire, which is overall less efficient because insulation between strands reduces packing density...

For most vehicles, 150-300v @150a seems like a lot of power, and it is, but at low RPM, if you limit to 150A your starting torque will suffer immensely, and you need very precise control over this powerful starting torque. Hall effect sensors are the way to go, unless, like TESLA you can braze...

I am familiar with the recent design trends, I work in the industry and my employer provides an excellent continual improvement program. Yes, i am aware that they have them with built in isolation, but then there is no price difference between a shunt + modulator with isolation and a closed...