Huanyang VFD and spindle problem

[Jonathan]

Is it better to have the nearest value as possible or just lower than the original? I think the nearest, am I right?

It depends on the parameter. For a new design, you want the lowest values that affect the conduction and switching losses, so the forward voltage and switching time (related to gate charge) respectively. However when replacing a part you need to consider that the engineer will have matched the gate drive circuit to the particular IGBT, one would hope at least. Switching faster leads to more emi, so it's common to intentionally switch the devices more slowly (by increasing the gate series resistor) to reduce the emi to meet a specification. You could look at what gate resistors you have, versus the datasheet values - but bear in mind the datasheet isn't definitive. At best it's a good guideline, at worst it's a marketing document designed to make you buy the part.

This sort of thing matters more with bigger devices, like these 900 Amp ones I've been playing with lately:

There is different type of "TO247" like TO-247-3, is it the same?

I think the -3 is just designating that the part has three pins. One important thing to check is if the package of the ones you have has metal on the back, or is all plastic? If plastic, then you should either get the same or add insulation to the new ones (bit awkward).

I would go with the first one if you think it's a good choice or I'm missing something ?

I think it's OK - the forward voltage is a bit higher so it will heat up more, but the current used with these spindles tends to be a lot less than the VFD rating so you will get away with it. If it breaks again you know what to do...