Regenerative braking, how? - Page 2 - Electronic Circuits Projects Diagrams Free

ecerfoglio · 9th June 2008, 08:18 PM

Quote:

Originally Posted by HellTriX

With no load their on the windings, they quickly loose current and then voltage.
If you where to dead short them for a brief ....

I think you are thinking about a series wound motor (that deppends on the armature current to have a magnetic field and EMF), while the OP and others are thinking about either a shunt wound motor (uses voltage to generate its magnetic field) or a permanent magnet one (has a fixed magnetic field)

ninestein · 28th August 2008, 03:37 PM

Quote:

Originally Posted by HellTriX

With no load their on the windings, they quickly loose current and then voltage.
If you where to dead short them for a brief period then disconnect and measure the voltage directly after that you may find a spike in voltage well above the initial input. This is why you would use PWM to pulse it for high current the feed the voltage spike back into the pack. When voltage equalized you would short it again and take another high voltage spike back into the pack. All this happening hundreds of times per second.

This is the principle I have been playing around with for a homemade ebike, establishing the correct switching frequency from the generative voltage plus motors inductance to generator open circuit (volt boost to battery) has been my problem. An unbranded motor and thus unknown inductance has complicated things somewhat but I will certainly test in the hundreds of hz now.
Many thanks

Willbe · 28th August 2008, 05:48 PM

Quote:

Originally Posted by ldanielrosa

81.7kJ minus losses.

I got about half that. . .

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