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The Basement
PCB shop for hobby projects?
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<blockquote data-quote="John Roberts" data-source="post: 96531" data-attributes="member: 126"><p>Re: PCB shop for hobby projects?</p><p></p><p></p><p>OK schematics help... 21844 has the charge pump build in for HS switch turning on. </p><p></p><p>I'm not sure I understand what "active rectification" means in this context. The high side mosfet switch has a body diode that will conduct whenever the motor voltage (back EMF?) is a diode drop higher than battery voltage. </p><p></p><p>Again not sure I follow... I may need to re-eductate myself about brushed DC motors (magnet? field coil? ?) Under acceleration, on/off duty cycle will modulate battery energy applied to motor. For braking it seems voltage coming from motor could depend on speed like a generator in a car. The alternator in a car modulates an internal coil winding to modulate output current. </p><p></p><p>How do you control the regenerative braking separately from the forward acceleration? </p><p></p><p>bigger cap.. The circuit may be self-charging, so first on cycle may be weak but it will catch up, just like when motor first turns on. </p><p></p><p></p><p>Lets NOT reinvent this wheel. Do you have a similar design that "inspired" you that we can look at to see how this has been done before? I am actually OK with reinventing wheels but first I like to look at all the old wheels so i don't reinvent any old mistakes. </p><p></p><p>Perhaps I just don't understand how your selected motor behaves, I am not a motor expert. I gave some positive attention to regenerative braking for buses and subways back a few decades ago when it was a new concept, and more recently for race cars where it is very promising (not so much for NASCAR but for racing that involves braking for turns). There should be lots of art out there to look at. </p><p></p><p>Sorry if you are already way ahead of me on this design. </p><p></p><p>JR</p><p></p><p>edit- electric car just did 200MPH over measured mile /edit</p></blockquote><p></p>
[QUOTE="John Roberts, post: 96531, member: 126"] Re: PCB shop for hobby projects? OK schematics help... 21844 has the charge pump build in for HS switch turning on. I'm not sure I understand what "active rectification" means in this context. The high side mosfet switch has a body diode that will conduct whenever the motor voltage (back EMF?) is a diode drop higher than battery voltage. Again not sure I follow... I may need to re-eductate myself about brushed DC motors (magnet? field coil? ?) Under acceleration, on/off duty cycle will modulate battery energy applied to motor. For braking it seems voltage coming from motor could depend on speed like a generator in a car. The alternator in a car modulates an internal coil winding to modulate output current. How do you control the regenerative braking separately from the forward acceleration? bigger cap.. The circuit may be self-charging, so first on cycle may be weak but it will catch up, just like when motor first turns on. Lets NOT reinvent this wheel. Do you have a similar design that "inspired" you that we can look at to see how this has been done before? I am actually OK with reinventing wheels but first I like to look at all the old wheels so i don't reinvent any old mistakes. Perhaps I just don't understand how your selected motor behaves, I am not a motor expert. I gave some positive attention to regenerative braking for buses and subways back a few decades ago when it was a new concept, and more recently for race cars where it is very promising (not so much for NASCAR but for racing that involves braking for turns). There should be lots of art out there to look at. Sorry if you are already way ahead of me on this design. JR edit- electric car just did 200MPH over measured mile /edit [/QUOTE]
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