Dynamics and Performance Indicators of EV — Lesson 2

This lesson covers the dynamics of electric vehicles, focusing on the derivation of different dynamic equations with variable tractive effort forces. It explains the three modes of operation for an electric vehicle: constant torque mode for initial acceleration, constant power mode for high-speed operation, and constant speed mode for maintaining a steady speed. The lesson also discusses the performance indicators of a vehicle, such as acceleration and maximum speed. It further delves into the torque-speed graph, explaining the different regions of operation. The lesson concludes with the simplification of dynamic equations, assuming no load forces and inertia, and the calculation of time, average power, and energy required in each mode of operation.

Video Highlights

00:39 - Explaining dynamic equations with Variable Tractive Effort forces
06:38 - Torque-Speed graph
10:59 - Discussion on Constant Torque, Power, and Speed Modes
19:37 - Simplifying dynamic equations and calculating time, average power, and energy
21:14 - Discussion on vehicle's time to reach rated speed and required energy
28:26 - Explaining time needed for vehicle to exceed rated speed

Key Takeaways

- Electric vehicles operate in three modes: constant torque mode, constant power mode, and constant speed mode.
- The torque-speed graph is a crucial tool for understanding the operation of electric vehicles.
- The dynamic equations of electric vehicles can be simplified by assuming no load forces and inertia.
- The time, average power, and energy required in each mode of operation can be calculated using the simplified dynamic equations.