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The Basement
PCB shop for hobby projects?
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<blockquote data-quote="John Roberts" data-source="post: 96538" data-attributes="member: 126"><p>Re: PCB shop for hobby projects?</p><p></p><p></p><p>I think I get some of it now... The duty cycle (if frequency is fast enough) applies an average voltage to the motor. If this average voltage is more than the speed/demand of the motor it will draw current from battery and accelerate the motor. If average voltage applied based on duty cycle is less than voltage generated by motor, current flows back into the battery. So magic is in tweaking duty cycle for speed/load. </p><p></p><p></p><p>I am still a little fuzzy on this.. maybe i need to soak the idea in beer and look at it again later. </p><p></p><p>it seems easiest how much "go or slow" control is to measure current in/out of battery with a very low impedance series R (perhaps a piece of wire). A gas pedal that directly varies duty cycle could be adjusted manually based on how fast you want to go. Many microprocessors have multiple A/D converters available, perhaps detect current in low side of battery, with level shift to always be positive voltage. Utility of detecting RPM of motor depends on linearity of voltage output. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 96538, member: 126"] Re: PCB shop for hobby projects? I think I get some of it now... The duty cycle (if frequency is fast enough) applies an average voltage to the motor. If this average voltage is more than the speed/demand of the motor it will draw current from battery and accelerate the motor. If average voltage applied based on duty cycle is less than voltage generated by motor, current flows back into the battery. So magic is in tweaking duty cycle for speed/load. I am still a little fuzzy on this.. maybe i need to soak the idea in beer and look at it again later. it seems easiest how much "go or slow" control is to measure current in/out of battery with a very low impedance series R (perhaps a piece of wire). A gas pedal that directly varies duty cycle could be adjusted manually based on how fast you want to go. Many microprocessors have multiple A/D converters available, perhaps detect current in low side of battery, with level shift to always be positive voltage. Utility of detecting RPM of motor depends on linearity of voltage output. JR [/QUOTE]
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