Re: HP and RPMs
No. A controller doesn't manipulate voltage that way. A controller is like a big light switch (or a bunch of switches working together)...the slower the switch switches on/off the less "On time" you have, less "on time" = less speed. The faster it switches the more "On time". The more on time the faster the motor will turn. Amperage is dependant on load, the controller will output as much as required up to the controllers amperage limit. If you have a 400 amp controller and your motor can't use but 300 of those amps at max load then thats all you will see out of the controller.
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