Week-6 Challenge: EV Drivetrain
1) SOLUTION:
AC – DC Converter:
AC to DC converters are most commonly used in Plug-in Hybrid Electric Vehicles (PHEV) & Plug-in Electric Vehicles (PEV). These vehicles get their propulsion power from an external electricity source (charging stations) which is alternating current. The battery needs to be charged using a direct current source. For this purpose, AC to DC converter is employed in a PHEV & PEV.
DC – DC Converter:
DC-DC converters can be used to interface the elements in the electric power train by boosting or chopping the voltage levels. By introducing DC/DC converters one can choose the voltage variation of the devices and the power of each device can be controlled. The power of the DC/DC converter depends on the characteristics of the vehicle such as top speed, acceleration time from 0 to 100 Km/h, weight, maximum torque, and power profile (peak power, continuous power).
DC – AC Converter (Inverter):
The DC/AC converter is required to convert the dc power to a suitable ac power for the electrical machine. The power output from battery pack (DC current) is converted using inverter to be used in electric motor (AC current).
3) SOLUTION:
This is the mathematical model of DC motor .
Input voltage as multiply of step input and kphi is given to the adder and Armature resistance is multiplied with (kphi)^2 given to subtractor in order to get speed.
Script file is shown below
output is shown below.
the speed decreases to -230 and remains constant as shown in the below.
4) SOLUTION:
The following points can be concluded from the above topic:
In the beginning, author describes the Internal Combustion Engines (ICE) in the world of automobile industry and also discuss different types of engines. He explains that all engines were similar and it was up to the user to select according to their requirement. He also speaks about induction motor and brushless DC motors.
Brushless DC motor have some advantages like: much less rotor heat is generated with the DC brushless drive.
No maintainance is required due to absence of brushes and commutator.
High efficiency more than 75%.
Speed and position is controlled.