Bicycle generator

[colum]

I hurt my knee and need to exercise on my stationary bicycle so I want to attach a DC motor to the wheel to charge a battery
I want to add an analog Volt meter and an analog Ampere meter to observe output.
but when I quit cycling the battery turns the bicycle in the opposite direction .
I would appreciate a simple design to charge a battery with a DC motor and placement of the meters and any Diodes needed
Thanks for reading this and appreciate any help, I will have to do this exercise for the rest of my life
Jeffrey

 

[davenn]

but when I quit cycling the battery turns the bicycle in the opposite direction .
I would appreciate a simple design to charge a battery with a DC motor and placement of the meters and any Diodes needed

yes, to be expected

A blocking diode will stop that from happening



You just need to ensure that the diode selected is rated to handle a bit higher current than
what is likely to flow through it.


Dave

 

[BobK]

What type of battery are you charging, and at what current? Simply connecting a battery to a generator could either damage the battery or set it on fire.

Bob

 

[Audioguru]

A lithium battery overcharging could set fire to your entire neighbourhood or town. Insurance won't cover the damage.

 

[WHONOES]

Arghh, the end of the planet as we know it???????????????

 

[davenn]

What type of battery are you charging, and at what current? Simply connecting a battery to a generator could either damage the battery or set it on fire.

Bob

yeah, good point, I forgot about that

 

[Bluejets]

Maybe use a car battery 40Ah and one (or more) of the dynamos that run on the wheel rim with a couple of bridge rectifiers.
I doubt that 15 minutes of pedalling that will do any damage.

(Could pass out from the hydrogen fumes if the Op was super fit.)

 

[(*steve*)]

Could pass out from the hydrogen fumes if the Op was super fit.

Or if you take too big a breath of it you could turn into a Zeppelin and float off the planet. [/Audioguru]