Dear community,
I am a beginner and trying to calculate the starting torque for my vehicle project with following specs:
Vehicle mass (with passengers and battery)=1000kg
Motor selection= AC-20 HPEVS depending on the starting torque i calculate
I need to meet the following performance criteria:
1. 0-60kmh in 20 Seconds
2. Vehicle to be driven in urban city traffic like paris, tokyo etc.
Based on this information I have tried to calculate the starting torque needed:
Acceleration from 0-60kmh in ms2 = 0.553
Mass kg =1000
Accelerating force= ma= 553N
Force against rolling R= u m g = 0.01 * 1000*10= 100N
Total tractive force= 653N
Now if this is the force needed to move the car, I want to reverse engineer to get to "motors torque":
Wheel torque = Tractive force * radius tyre in m = 653 * 0.3 = 195Nm
Now it is known that the Motor torque= Wheel torque / Diff Ratio
so assuming a Diff Ratio of 5:1,
a Motor torque= 39 Nm continuous is what I need?
My question:
1. Is this calculation correct and realistic for selecting a motor for my criteria?
2. Which graph should i refer to Torque vs RPM in "Peak" or "Continuous"?
I am a beginner and trying to calculate the starting torque for my vehicle project with following specs:
Vehicle mass (with passengers and battery)=1000kg
Motor selection= AC-20 HPEVS depending on the starting torque i calculate
I need to meet the following performance criteria:
1. 0-60kmh in 20 Seconds
2. Vehicle to be driven in urban city traffic like paris, tokyo etc.
Based on this information I have tried to calculate the starting torque needed:
Acceleration from 0-60kmh in ms2 = 0.553
Mass kg =1000
Accelerating force= ma= 553N
Force against rolling R= u m g = 0.01 * 1000*10= 100N
Total tractive force= 653N
Now if this is the force needed to move the car, I want to reverse engineer to get to "motors torque":
Wheel torque = Tractive force * radius tyre in m = 653 * 0.3 = 195Nm
Now it is known that the Motor torque= Wheel torque / Diff Ratio
so assuming a Diff Ratio of 5:1,
a Motor torque= 39 Nm continuous is what I need?
My question:
1. Is this calculation correct and realistic for selecting a motor for my criteria?
2. Which graph should i refer to Torque vs RPM in "Peak" or "Continuous"?