Gharbad
(?)Community Member
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- Posted: Fri, 11 Feb 2011 03:30:45 +0000
Sitwon
SlackerInside
Quote:
but if we make a current the device halts.. and stops working.. So its all voltage and no amperes..
Watts = Volts * Amps, so if Amps = 0 then Watts = Volts * 0.
As we all know, Volts * 0 can be simplified to 0.
Therefore, Watts = 0.
Unless this guy is using negative Watts to turn the motor I don't see how this can be seen as a net gain in power.
Zombie quote I know, but just felt like throwing this out there;
When controlling motors you vary the current or voltage (using transformers or power converters) to control the motor's mechanical behaviour. Current is proportional to torque so if you have high current the motor can stall. With any motor there is some optimum operation point for power production because of this mechanical torque-speed characteristic. A great example is a wind turbine where the wind just isn't very strong and its ability to spin the turbine is very non-linear.