Explain PWM to me, please.
February 13, 2010
I just need a good breakdown. The eventual goal is to obtain higher (or much higher) torque from my motors but at lower speeds. I am to beleive that PWM makes slower motors but also weak motors. I need strong, slow motors.
So we got duty cycle and frequency, I got that, sorta. Duty is just simple on and off, at 50% it will be on for 1/2 the time and off for the other 1/2. Frequency is uhh, I dunno. Let's say we are running at 1000hz (I know regular PWM freqs. are much higher) -so something loops around 1000 times a second. I got that. Now, it seems to me that you got yourself a loop inside of a loop. Or at least you have one loop and another telling it how fast to loop.
1st --Tell me if I am right or wrong or whatever you got
2nd --Back to the first question: Slow speed, high torque. I figure I can hook up a measure-thingie and look around for how many amps are cruising through --More current, at a given speed should mean more torque, right? -- Or is this just a measurement of inefficiency? At any rate, I would love it if someone could explain how these two numbers relate and how each could/should be adjusted?
Word to ya' motha!