Re: [PSUBS-MAILIST] Re: Motor controller...

[ROUFFIGNAC Laurent <laurent_rouffignac@yahoo.com>]

Do you plan to have an acceleration and deceleration
ramp?

If you're using the UC2637, how are you going to
generate the feedback information on the voltage (or
the speed)? If you're using a resistor/shunt it should
support more than 100A with a value as small as
possible....

Laurent

--- Subscuba@aol.com wrote:
> John,
> 
> I have been looking at your application for the
> motor controller. Although I 
> haven't drawn a schematic, I suggest we use a
> Unitrode UC2637 Motor 
> controller (try www.Unitrode.com, look at
> application note U-102) and four 
> IXYS IXFX 150N150 (www.ixys.com). These are 150 volt
> devices with a thermal 
> impedance of 0.22 Degrees C per watt and have a 150
> ampere rating. I didn't 
> check on the cost but you might.
> 
> I'll be working on the schematic this week. It looks
> like it will be simpler 
> than my controller and yet be an H bridge which you
> can use for all your 
> motors. Your pot in the joystick would probably be a
> linear taper 1K pot. The 
> real problem will be in packaging the electronics
> such that parasitic 
> inductance's will be minimized. We will still need
> some very high quality 
> capacitors to act as local bypass to avoid voltage
> spikes. Short leads to 
> your batteries will help. Motor lead lengths are not
> important. The controls 
> can be located anywhere you wish but the power
> controller needs to be located 
> close to your batteries. Have you given any thought
> to fuses and contactors 
> (solenoids) to apply power?
> 
> Ken Martindale 


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