Transistor
1 µW
- Joined
- Nov 28, 2017
- Messages
- 2
I'm to design the power train of a electric go kart for a competition. I'm having problems with numbers.(considering vehicle dynamics like air drag, rolling restiance)
Competition rules and restrictions on power tarin :
Max motor rating :2500w
Max battery ratings: 48v 35ah
Max system current:60a
What I'm trying to achieve :
Speed of 40-60kmph(I know 60kmph is probably far fetched with even 2500w motor)
Total runtime of 75minutes
Acceleration of 0.8-1m/s^2
Assumptions:
Kart weight: 180kg (if lead acid batteries)
Rolling resistance: 0. 01
Coeff of drag:0. 88 (not sure about this no)
frontal area of kart:1. 19m^2 (not sure about this either)
Radius of wheels: 0. 14m
*feel free to recommend appropriate numbers for coeff of drag and frontal area
Help me arrive at the required motor and battery spec. I arrived at the following numbers:
8Nm for 0.83m/s^2 acceleration
862.6rpm for 45kmph max speed
I'll show how I came to these numbers after I learn how to upload pics here. This is my first post here
Competition rules and restrictions on power tarin :
Max motor rating :2500w
Max battery ratings: 48v 35ah
Max system current:60a
What I'm trying to achieve :
Speed of 40-60kmph(I know 60kmph is probably far fetched with even 2500w motor)
Total runtime of 75minutes
Acceleration of 0.8-1m/s^2
Assumptions:
Kart weight: 180kg (if lead acid batteries)
Rolling resistance: 0. 01
Coeff of drag:0. 88 (not sure about this no)
frontal area of kart:1. 19m^2 (not sure about this either)
Radius of wheels: 0. 14m
*feel free to recommend appropriate numbers for coeff of drag and frontal area
Help me arrive at the required motor and battery spec. I arrived at the following numbers:
8Nm for 0.83m/s^2 acceleration
862.6rpm for 45kmph max speed
I'll show how I came to these numbers after I learn how to upload pics here. This is my first post here