Mini Wooden Bat Mobile!!!

[EngineGeek21]

This is not going to be the best constructed piece of machinery... but im trying!!! How can i make A throttle for this motor so i can adjust the speed... i need to get a 12v to 110v inverter before i can make it run... I am only 15 so im kinda on a budget. Watch my YouTube vids on it if you want to have updates on the project!!!

Thanks,
EngineGeek21


Youtube: EngineGeek21

 

[Tpdingo]

A 110V motor. No no no no no. That is HORRIBLY inefficient. Dont do that.

For example: A UPS with a 12V 7Ah battery can charge a cell phone probably 12 or 13 times with the phone on a straight DC-DC connection(with a proper charger). With an inverter, you might get 1 whole charge if you are lucky

 

[EngineGeek21]

A 110V motor. No no no no no. That is HORRIBLY inefficient. Dont do that.

Oh... its all i had though... what motor should i use??? I got a 12v pump motor, but its to weak

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[Tpdingo]

Look around you local craigslist. Look for some old RAZOR electric something or other. My E300 scooter goes around 12mph, plenty for a wood kart. They should be cheap and plentiful on CL. Salvage the motor, as the battery is likely dead. You seem to have a decent battery on hand.

 

[EngineGeek21]

Look around you local craigslist. Look for some old RAZOR electric something or other. My E300 scooter goes around 12mph, plenty for a wood kart. They should be cheal and plentiful on CL. Salvage the motor, as the battery is likely dead. You seem to have a decent battery on hand.

This is the electric motor... spins pretty fast

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[Tpdingo]

It spins fast but is completely useless. You want atleast 500W at minimum, more likely 1000W.

12V * 6A = 72W. That is enough to pull a powerwheels, and no more.

Normal motors for karts are 36-48V @ 20-30A

 

[EngineGeek21]

It spins fast but is completely useless. You want atleast 500W at minimum, more likely 1000W.

12V * 6A = 72W. That is enough to pull a powerwheels, and no more.

Normal motors for karts are 36-48V @ 20-30A

Ok thanks

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---------- Post added at 09:39 AM ---------- Previous post was at 09:36 AM ----------

Ok thanks

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Could i use a car alternator??? Wouldnt that work???

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[Tpdingo]

Yes that will work, though you will need to convert it to a Brushless DC motor. There are videos on youtube about this. Also note you will need a BLDC motor driver, you cant just do positive to positive and negative to negative like with brushed motors. I also think it is impossible to do this if it is a GM onewire alternator.

 

[EngineGeek21]

Yes that will work, though you will need to convert it to a Brushless DC motor. There are videos on youtube about this. Also note you will need a BLDC motor driver, you cant just do positive to positive and negative to negative like with brushed motors. I also think it is impossible to do this if it is a GM onewire alternator.

Why cant i use a 110v motor, will it consume to much battery going from 12 to 110???

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[Tpdingo]

The problem isnt the 12 to 110. DC boost circuits have been 80-90% efficient for a while. The problem is the AC-DC conversion. It isnt efficient in the slightest. Go back to my UPS example .13x more energy was usable without DC-AC conversion.

It might work on DC, if it is a universal brushed motor. If it is an induction motor which it likely is, it wont.

 

[EngineGeek21]

The problem isnt the 12 to 110. DC boost circuits have been 80-90% efficient for a while. The problem is the AC-DC conversion. It isnt efficient in the slightest. Go back to my UPS example .13x more energy was usable without DC-AC conversion.

It might work on DC, if it is a universal brushed motor. If it is an induction motor which it likely is, it wont.

Oh ok... thank you

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[anickode]

Plus there's the fact that you can't run a single phase AC motor at variable speed, either by modulating the voltage or frequency. Well, you can by modulating the frequency, but you can only slow it down to about 70-80% of nameplate speed before the centrifugal switch kicks in and engages the start winding. Plus the back-EMF from the inverter drive... It'd get messy fast.

No, you just need to buy a proper motor.

 

[EngineGeek21]

Plus there's the fact that you can't run a single phase AC motor at variable speed, either by modulating the voltage or frequency. Well, you can by modulating the frequency, but you can only slow it down to about 70-80% of nameplate speed before the centrifugal switch kicks in and engages the start winding. Plus the back-EMF from the inverter drive... It'd get messy fast.

No, you just need to buy a proper motor.

Ok

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[supermanotorious]

bet you can find a used internal combustion engine locally for free or close to it, then really get your project rolling (no pun intended)