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how can i do all mathemetical calculation for finding effiency of an electrical byke? Answered

m working on the project bt uncapable to find all mathametical work....... pls tell me the formet that find it...
what calculation should be required like all stress , how to find c.g.

2 Replies

bwrussell (author)2013-02-21

Basically you want to find (Energy Out)/(Energy In). You need to define what the boundaries of the system are and then determine the difference between how much energy is put into the system and how much you can extract.

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frollard (author)2013-02-21

Think of all components in the system...mechanically.
...then figure out how efficient each of those systems is.

Input power to Charger to battery to Speed Controller to Motor to drive system to wheel to road.
Each of those junctions will have an efficiency loss, and they compound since each is a % value.

Input to charger: depends on charger
Charger to battery: depends on charger and battery
battery to ESC (and in ESC): % loss, usually 80-90% efficient
motor to drive system: % loss, depends on system, belts, direct transmission drive, friction drive, chain drive all have different losses.
wheel to road: all 'other' drag on the system.

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