Chris Loiacono wrote:
>
> I just took on a project for a dedicated machine logic controller and I had
> to include a driver for a 90V 1.75A PMDC Motor

> So I believe that to simplify my desugn I should be looking for drivers for
> controlling IGBT's or MOSFET's. I think power MOSFET's are the right choice
> for the voltage and size of the motor anyway.....


Maybe not. The really low RDS-on MOSFETs are
usually rated for lower voltages, and the IGBTs
are more suited for high voltages like mains
SMPS use.

This 90v DC motor is quite typical of the older
style motor and drivers and at <2A you can get
a good cheap result with the older style
transistors. There are a LOT of 5A 150v transistors
(etc) that are cheap and ideal for this type
of app.

Personally at 2A I would probably use a relay for
direction control and a single transistor for
the speed PWM. You did say "simplify". :o)
-Roman

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