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PWM 12-48VDC 100A Controller Help!!!
A little help building an economical PWM controller

I would really like some help here, I am trying to build the most economical PWM Controller for a PM DC motor the voltage range is from 12 - 48V DC and the controller needs to be able to handle 100A for 1-2 mins, does anyone have a diagram and parts list to help me acheive this? I don't want anything like regen braking or ramp up/down curves just a simple robust controller that can operate from a 10K Ohm variable resistor pot

Please mail me with any help or feedback

Many thanks
Andy Mahoney

Sir,I am doing a project work related to Brushless DC motors and their controllers.Can you please send me the detailed information regarding it.I will be very thankful to you for that.
my e-mail ID:ramuksk@rediffmail.com