In my opinion i proved my point.
Leeps wrote:well at 12 volts we have roughly 88% efficiency at 600 rpms, at 60 volts we have just over 90% at roughly 3000 rpms.
In my opinion i proved my point. If you disagree ill gladly continue.
Gladly, i really wanted him to ask for it, but ill do it for you.
The pwm effect that youve been talking about has been the voltage all along, it had nothing to do with the current. Notice in all the graphs that at a certain voltage the efficiency does go down when the rpms drop this is because the current is going up. Its not the rpms thats killing your efficiency its the current, i understand that with one graph and one voltage its easy to come to the wrong conclusion. Ive been trying to tell you otherwise but hey at least we busted the myth.
That was the purpose of my first question, it was wether or not you understood why a motor consumes the current that it does. If you understand the relationship between rpm, voltage, and current.
Leeps wrote:Are we closer?
Either you are joking (in which case ha, ha, ha) or you SERIOUSLY don't have clue about how to read these charts...
Leeps wrote:88% efficiency at 600 rpm and 95% efficiency at 3000 rpm thats a spread of 5 times in the rpm range. Im sure if they gave a chart at 6 volts you would get a greater spread.
Seriously now are you going to tell me that efficiency at low rpm is a myth?!?
The pwm controller is a key to getting your efficiency at low rpm because its a really efficient way to drop the voltage going to the motor.
Are we closer?
Matt Gruber wrote:Good job Joe! Even if safe is a little slow, others will read this topic and gain a lot of understanding.
The "Heroic" PWM Controller Myth is still BUSTED!
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