Electric_Vehicle_Case_Study_Presentation

General Business Analyzing Key Performance Metrics

Presented by: Feroo Singh GangwarInstitution/Organization: CNH Industrial India Pvt. Ltd.Electric Vehicle Case Study

Introduction

• Objective:

  • To evaluate the performance of various components in an EV system using calculated parameters.

• Scope:

  • Operating Speed of the Rotor

  • Electromotive Force

  • Rolling Resistance, Aerodynamic Drag, and Gradient Force

Problem Statement

• Role:

  • Engineer in the EV industry responsible for calculating critical parameters to gauge the effectiveness of components in the electric vehicle system.

• Focus Area:

  • Mechanical and Electrical Performance

  • Efficiency Metrics

Tasks Overview

• Rotor Speed and Frequency Calculations

• Hall Voltage Due to Hall Effect

• Electromotive Force in a DC Motor

• Torque Calculations for Induction and Switched Reluctance Motors

• Resistance, Drag, and Gradient Forces

Operating Speed of the Rotor

• Given:

  • Synchronous Speed = 1500 rpm

  • Slip Speed = 50 rpm

• Formula:

  • Operating Speed = Synchronous Speed - Slip Speed

• Calculation:

  • Operating Speed = 1500 - 50 = 1450 rpm

Frequency of Rotor

• Given:

  • Fractional Slip (s) = 0.03

  • Supply Frequency (fs) = 50 Hz

• Formula:

  • Rotor Frequency = Fractional Slip × Supply Frequency

• Calculation:

  • Rotor Frequency = 0.03 × 50 = 1.5 Hz

Hall Voltage (V_H) Generated Due to Hall Effect

• Given:

  • Drift Velocity = 0.1 m/s

  • Magnetic Field = 0.5 T

• Formula:

  • V_H = Drift Velocity × Magnetic Field

• Calculation:

  • V_H = 0.1 × 0.5 = 0.05 V

Electromotive Force (E_b)

• Given:

  • Poles (P) = 4

  • Magnetic Flux (φ) = 0.02 Wb

  • Speed (N) = 1500 rpm

  • Conductors (Z) = 100

  • Parallel Paths (A) = 2

• Formula:

  • E_b = (P × N × φ × Z) / (60 × A)

• Calculation:

  • E_b = (4 × 1500 × 0.02 × 100) / (60 × 2) = 100 V

Torque of Three-Phase Induction Motor

• Given:

  • Flux (φ) = 0.03 Wb

  • Rotor Current (Ir) = 10 A

  • Angle (θ) = 30°

  • Constant (k) = 0.5

• Formula:

  • T = k × φ × Ir × sin(θ)

• Calculation:

  • T = 0.5 × 0.03 × 10 × sin(30°) = 0.075 Nm

Rolling Resistance Force (Frr)

• Given:

  • Coefficient of Friction (μ) = 0.02

  • Mass (m) = 1200 kg

  • Gravity (g) = 9.8 m/s²

  • Inclination Angle (θ) = 4°

• Formula:

  • Frr = μ × m × g × cos(θ)

• Calculation:

  • Frr = 0.02 × 1200 × 9.8 × cos(4°) = 234.627 N

Aerodynamic Drag Force (Fad)

• Given:

  • Air Density (ρ) = 1.2 kg/m³

  • Frontal Area (A) = 5 m²

  • Drag Coefficient (Cd) = 0.3

  • Speed (v) = 30 m/s

• Formula:

  • Fad = (1/2) × ρ × A × Cd × v²

• Calculation:

  • Fad = (1/2) × 1.2 × 5 × 0.3 × 30² = 810 N

Gradient Force (Fgr)

• Given:

  • Mass (m) = 2000 kg

  • Gravity (g) = 9.8 m/s²

  • Inclination Angle (θ) = 5°

• Formula:

  • Fgr = m × g × sin(θ)

• Calculation:

  • Fgr = 2000 × 9.8 × sin(5°) = 1708 N

Total Tractive Force (Ftt)

• Given:

  • Rolling Resistance Force (Frr) = 200 N

  • Aerodynamic Drag Force (Fad) = 120 N

  • Gradient Force (Fgr) = 80 N

• Formula:

  • Ftt = Frr + Fad + Fgr

• Calculation:

  • Ftt = 200 + 120 + 80 = 400 N

Torque Exerted by the Motor (Tm)

• Given:

  • Total Tractive Effort (Ftt) = 500 N

  • Rolling Radius (r) = 0.3 m

  • Gear Ratio (G) = 4

• Formula:

  • Tm = (Ftt × r) / G

• Calculation:

  • Tm = (500 × 0.3) / 4 = 37.5 Nm

Summary of Results

Key Learnings

• Importance of component efficiency in EVs

• Role of calculations in optimizing performance

• Implications for EV design and manufacturing

Questions and Discussions

• Feel free to ask questions or share your thoughts!