hi,
I have done earlier very small dc series motor 12 yards of about 21 gauge armature winding.
The calculated resistance was 0.264 ohms, giving with 20 v battery 76 amperes inrush current, it started with cordless drill battery nicely the armature weight was about only 1/2 lbs! Seems still odd to me because battery is not capable to provide this high current!?
I know at least a little bit about theory for example about back emf. I do not still understand how this is possible because electricity is so fast.
the warming energy 76x76x 0.26 watts did not burn insulation of course effecting very short time because back emf or how battey do not notice too high current demand and damage!?
The end result was good anyway.
Now i constucted a bigger one motor with same winding and was thinking to run it, now armature is about 2 lbs.
I tried to start it with drill battery and a thermistor (Amether ms35 3r030, 3 ohms and max 30 amperes 1200 J instantaneous failure energy). Battery and thermistor destroyed. The armature did try to start short time moving! The battery was only 1.5 ah, voltage dropped to 13.8 can't charge anymore.
I have not spare cordless drill battery any more to damage with it and do not want to use soft starter.
What I have to destroy still in the name of fun and experimentation is
-motor
- 2 pieces of 12v motor bike batteries
- a 50v li-ion battery with bms (40 a max peak current, short circuit protection)
I know it is up to me in what order I destroy my things in the name of fun, but have anybody any opinion about this.
In advange i know answer: (already in my mind) do not try to do something do not understand at all!
Is soft starter only way or give up?
thanks
I have done earlier very small dc series motor 12 yards of about 21 gauge armature winding.
The calculated resistance was 0.264 ohms, giving with 20 v battery 76 amperes inrush current, it started with cordless drill battery nicely the armature weight was about only 1/2 lbs! Seems still odd to me because battery is not capable to provide this high current!?
I know at least a little bit about theory for example about back emf. I do not still understand how this is possible because electricity is so fast.
the warming energy 76x76x 0.26 watts did not burn insulation of course effecting very short time because back emf or how battey do not notice too high current demand and damage!?
The end result was good anyway.
Now i constucted a bigger one motor with same winding and was thinking to run it, now armature is about 2 lbs.
I tried to start it with drill battery and a thermistor (Amether ms35 3r030, 3 ohms and max 30 amperes 1200 J instantaneous failure energy). Battery and thermistor destroyed. The armature did try to start short time moving! The battery was only 1.5 ah, voltage dropped to 13.8 can't charge anymore.
I have not spare cordless drill battery any more to damage with it and do not want to use soft starter.
What I have to destroy still in the name of fun and experimentation is
-motor
- 2 pieces of 12v motor bike batteries
- a 50v li-ion battery with bms (40 a max peak current, short circuit protection)
I know it is up to me in what order I destroy my things in the name of fun, but have anybody any opinion about this.
In advange i know answer: (already in my mind) do not try to do something do not understand at all!
Is soft starter only way or give up?
thanks