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Messages - djbakke

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Tech Help / Re: Battery configuration
« on: July 11, 2009, 08:05:57 AM »
I was under the impression a motor controller is just a Pulse Width Modulator(PWM) and switches the power off/on very fast to control motor speed.  I thought a DC/DC converter does what you are describing and is usually used to step down the voltage to 12V to run lights and other accessories on the EV. 

Frodus - Now if what you are saying is correct I could wire six 12V 50Ah batteries in parallel and the motor controller can make a DC motor perform like it were on 72V.  What motor controller can do this?  I can stop thinking about this if there is already one commercially available.  Thanks

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Tech Help / Re: Battery configuration
« on: July 10, 2009, 08:07:50 AM »
I have a related question about battery configuration. 
My assumptions:
- Current draw on an electric motor is dicated by load condition. Typically on an EV, maximum current draw is during acceleration from a stopped position.  On a flat road, current demand will taper off as rpm's increase.
- Voltage dictates the speed of the motor.  With a direct drive EV, voltage dictates the vehicle theoretical top speed.
Has anyone developed or thought of a battery management system that electrically reconfigures the batteries on an EV to optimize for current, voltage and an equal compromise between the two?  Basically an electronic transmission by rearranging the battteies from parallel to series and combinations in between.   The objective is to maintain good acceleration and have good top speed that operates the motor ideal efficency range.  Is this a possibility or am I dreaming again?  I'm in the planning phase of converting a Suzuki GS500 and this is one idea that came to mind.

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