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Motors in Electric Vehicles - Coggle Diagram
Motors in Electric Vehicles
Motor Basics
Main Parts
Stator: Stationary, creates magnetic field
Rotor: Rotates due to magnetic interaction
Converts electrical energy → mechanical energy
AC Motors
Powered by alternating current
Types
Synchronous Motor
Requires external DC source
Runs at constant speed (Ns)
High efficiency & precision
Asynchronous Motor (Induction)
Rotor speed < synchronous speed
Self-starting
Simpler & cheaper
DC Motors
Brushed DC Motor
High torque at low speed
Needs more maintenance
Uses brushes & commutator
Brushless DC Motor (BLDC)
Uses electronic commutation
No brushes or commutator
More efficient, less maintenance
Powered by direct current
Motor Components
Rotor Types
Squirrel Cage
Wound Rotor
Permanent Magnet
Commutator: Reverses current direction in DC motor
Brush: Conducts current in brushed DC motor
Motor Characteristics
Torque-Speed Curve
Pull-up Torque
Breakdown Torque
Full Load Torque
Starting Torque
Motor Power = Torque × Speed
Motor Efficiency = Output Power ÷ Input Power × 100%
Motor Losses
Core Losses – Magnetic
Stator Losses – I²R heat
Rotor Losses – I²R heat
Friction & Windage
Stray Load Losses
Why AC Motors in EVs?
Higher speed capability
Less maintenance
Works with inverters easily
Better efficiency and control