Motor & ESC compatibility

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Hi all, I'm currently working on building/ upgrading my electric skateboard. I have a FocBox Tenka and am looking for a set of motors that will work well with the specific esc. I'm pretty new to working with electronics so I'm trying to keep it simple. I know that with a motor, Voltage correlates to speed and the torque is represented by watt output. If I have a motor that has a 5000w draw, will my esc be capable of limiting the watt draw of the motors or do both the watt and volt values work directly with one another (if one goes up/ down, so does the other)? I've attempted to do some research but have found very little helpful information when it comes to how exactly an esc regulates the values it does. Please reach out if you need more information to answer the question, I'm trying to provide everything necessary but I think I may have bitten off more than I could chew. Thank you for your help!!

Mason G.

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Welcome to AVRfreaks!

 

While you are in teh right forum, are you aware that this site is more focused on microcontrollers from the Atmel/Microchip family, an not electric skateboards?

 

But not to worry....theres a lot of talent here and many will have some good information on these things.

 

 

I myself use ESC for my sons RC cars/Trucks...but nothing in the 5Kw range.

 

We are looking for80Kw ESC's at some point for the electric racing go kart that we have on the design board though

 

Cheers!

Jim

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Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Welcome!

MGeiss wrote:
... electric skateboard ... set of motors ...
then motor synchronization; single motor into transaxle would be simpler.

Sudden loss of traction is another complexity for control of any motor and more difficult for multiple motors.

MGeiss wrote:
the torque is represented by watt output.
Power (watts) is torque dot product angular velocity.

MGeiss wrote:
5000w
Scary power for a skateboard; consider a kill switch maybe on the lanyard (akin to surfboards)

MGeiss wrote:
I think I may have bitten off more than I could chew.
How we stretch ourselvessmiley

 


Relation Between Torque And Power - Formula, Derivation

"Dare to be naïve." - Buckminster Fuller

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 Voltage correlates to speed and the torque is represented by watt output. 

For a DC motor, torque is proportional to motor current.  

 

 If I have a motor that has a 5000w draw

Note other than some small residual, the motor doesn't draw anything by itself...the ideal motor will draw zero, until a load is applied. Of course tell that to a 100 hp motor you are trying to spin by hand at 500 rpm..it won't feel like zero.

It may be better to talk about what the motor is delivering.

 

If the ESC limits current, it will limit torque, such as to prevent a jammed conveyor belt from getting torn up from too much torque.

 

Something like 70% off all electric power is consumed by large industrial motors...so it is good you are thinking about motors!  There is a plant nearby that makes motors you can almost walk in.  Everything there is moved by crane...these motors cost thousands or even half a million dollars.  They must run 20 years nonstop 24/7 & are designed to have some maintenance done while running.  Why?  They pump oil, thousands of gallons every minute....turn off 10 minutes and that is a lot of money.

 

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Fri. Apr 15, 2022 - 04:38 AM
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Begin with the basics: 

E = I*R   where E is Volts (Electromotive force),  I = Current in Amps, R is Resistance in Ohms 

This can also be stated as  I = E/R or R = E/I 

This is Ohms law.  example  9v battery with 1000 ohm resistor connected across the terminals will draw 9 milli-amps of current

So your ESC will control either the voltage or the current using resistance to control the speed of the motor..

 

Watts Law is P = I * V, or Power (Watts) is Current times Voltage

 

Google these two terms and find a wiki that explains them or search Amazon for a good beginners book on electric(al) basics of DC (Direct Current) theory.

Good luck with your learning, and drop in anytime you have questions.

 

Jim

 

 

FF = PI > S.E.T