EV Basics: Understanding the World of Electric Vehicles

Explore the four main electric vehicle types—battery electric, hybrid, plug-in hybrid, and fuel cell—along with series, parallel, and series-parallel hybrids, including charging, regenerative braking, and motor drive basics.

Explore the sizing of an electric vehicle powertrain by analyzing external forces—rolling resistance, aerodynamic drag, and gradient force—and compute the required motor torque, power, and battery load for varying conditions.

Calculate traction force by balancing rolling resistance, aerodynamic drag, and gradient against motor output, showing how acceleration or stall results from the net force on an electric vehicle.

Determine the wheel radius from the data sheet, compute wheel torque from the traction forces, and convert to motor torque using gear ratio and transmission efficiency.

Calculate peak and motor power for EVs by combining traction power with battery power while accounting for auxiliary loads, forces, and gradeability.

Explore the types of electric motors used in electric vehicles, including brushed and brushless DC motors, induction motors, permanent magnet synchronous motors, and switch reluctance motors, with advantages and applications.

Explore motor control systems for electric vehicles, comparing open loop and closed loop controls, and implementing PID controllers to manage speed, torque, and direction with inverters.

Power electronic converters in EVs encompass dc-dc, ac-dc rectifiers, and inverters, including bidirectional options for regenerative braking and onboard charging, controlled by PWM and space vector modulation.

Explore the basics of electric vehicle batteries, including cell versus battery, nominal voltage, capacity in ampere hour and watt hour, and key concepts like c rating and internal resistance.

Explore why packs of small batteries offer higher energy density and easier maintenance than a single large cell, and how series and parallel connections create EV battery packs.

Explore how the battery management system protects the battery, monitors cell voltages, currents, and temperatures, and coordinates cell balancing for SOC, SOH, and thermal and power optimization.

Explore charging technologies for electric vehicles, including level 1, level 2, and dc fast charging, ac and dc standards, and vehicle-to-grid concepts, emphasizing efficiency, reliability, and user experience.

Explore future trends in electric vehicles, including wireless charging and battery swap platforms, autonomous driving progress across SAE levels, and green energy charging integrated with renewable energy sources.