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Electric Vehicle Propulsion, Torque-Speed Characteristics of Motors,…
Electric
Vehicle Propulsion
Motors
Converts electrical energy to mechanical energy
Stator (stationary)
Rotor (rotating)
AC Motors
DC Motors
Brushed DC Motor
Series Wound
Permanent Magnet/ Brushless :
Torque-Speed Characteristics of Motors
Starting torque
Pull-up torque
Breakdown torque
Full load torque
Asynchronous AC Motors
Operation is simple and user friendly
Not as efficient as synchronous
motor
Best suited for operation at speed
above 600 rpm
Permanent Magnet
Synchronous
operation is complicated
Offer great efficiency and precision
Operates best at lower speed
usually below 300 rpm
Used on a synchronous motor, also known as Permanent Magnet
Synchronous Motors
A permanent magnet mounted on the rotor
The magnet has its own magnetic field that interacts with the rotating
magnetic field of the stator
Types of Rotor
Squirrel Cage
Wound
Permanent Magnet
Synchronous Speed
Synchronous Speed (Ns) = 120 f/ p
Frequency: Current supply frequency (number of the complete cycle om 1 sec)
Number of pole pairs: determined by how many times a phase winding appears
Torque
Motor Characteristics & Performance
Force X Length
Power
Torque x Angular Speed
Efficiency
(Mechanical Power Output / Electrical Power Input) x 100%.