Dynamic design and Drive train designe for E-vehicle

Electric Vehicle Components

EV Parts

Basic electric vehicle driving flow Block Diagram

Vehicle Design Procedure for EV

Basic power required to move the vehicle

Free Body Diagram

Power = Total Tractive Force x Velocity of the vehicle

Types of forces on the Vehicle during motion

Total Tractive Force

  1. Rolling Resistance Force(Frr)

2. Aerodynamic drag force(Faero)

3. Hill climbing Force(Fhc)

4. Acceleration Force(Fxi)

1.      Linear Acceleration Force, 2.      Angular acceleration force

Rolling Resistance Force:

It is one of the forces that act to oppose the motion of a vehicle. It is the force between the wheels of the vehicle and the surface of the road.

The Coefficient, is a function of the Tire material, structure, temp, pressure, tread geometry, road roughness, material, presence & absence of liquids on the road.

Note:

•This value varies with SPEED. •Tire pressure increases its value decreases

Rolling resistance =coefficent of rolling friction*gross Vehicle weight

Frr= µrr m.g

where,

-µrr  – Rolling Resistanceααα Constaαnt

-m – Mass of the Vehicle

-g – Gravitational acceleration constant

coefficient of rolling friction for various contact surfaces with tires

Aerodynamic Drag Force:

•The force on an object that resists its motion through the air is called Aerodynamic drag force.

Aerodynamic drag force α square of the velocity of the vehicle

aerodynamic drag force acting from higher pressure region to lower pressure region

Fad = ½ρCdAv2  Newtons

where,

ρ – Air Density kg/m3

A – Frontal Area m2

Cd – Drag Coefficient

v  – Velocity of the Vehicle m/s

for more details:-

https://info.simuleon.com/blog/how-to-calculate-drag-coefficient-for-motorcycle

Excel Sheet for EV motor Selection base on above Calculations

motor-energy-calculations1-finalDownload