Does anyone have any good docs or tips on PWM speed controlling of large motors?
well i have a 250watt motor, 3krpm and 15amp full load current.
im trying to speed control the motor with the AVR's PWM timer.
i got the PWM part working, at around 2 or 3khz.
the problem is, the motor just dont want to get going. i have to push it a little, and it runs very slow. even when the timer value is FF, and thats when the only time it wants to go. unless im doing somethign wrong in the circuit, i just cant get it to go.
of course if i hook the 12v streight up to the motor, it goes EXTREMELY fast. but the PWM just dont wanna get it going.
any ideas? basic schematic of the circuit:
sorry if its crude, but i did it in paint. lol
Edit: oops forgot attachment