Week-6 Challenge: EV Drivetrain

1.A power converter electrical circuit that changes the sectric energy from one term into the desired form optimized for the specime load. A converter may do one or more functions and are an output.

A device that increases or decreases this voltage (AC or DC) of a power source depending on appication A converter that increases voltage is called a stop-up converter and a converter that decroses voltage is called a step-down converter In EV/HEV step-up and stop-down converters are combined into one unit. An application of a step-up converter is converting TV/HEV bottery voltage (typically 10- 300 volts) to about 650 volts to power the traction motor An athontage of using a conter to increase voltage from the battery is amater and leat expensive battery may be used whe suitzing an efficient high voltage motor An application of a step down inverter would be decreasing the high voltage arrect current too-300 volts) nor the HEV/IV buttery to low voltage (12-14) DC that can be used to charge the 12 volt qurilary buttery and operate light lood devices such as lighting, radio, and windows

The Power Electronic Converter can be classified into sixtypes

AC to DC Converter (Controlled Rectifier)

DC to DC Converter (DC Chopper)

AC to AC Converter (AC voltage regulator)

DC to AC Converter

Static Switches in the Fust Co (FC) stack battery tank and super-capacitors (SC) bank are snually used as clean energy sources in order to design highly efficient converters for the EV's power system advanced

DC/DC AC/DC and DC/AC converters required to adapt the

outout voltage and current levels with high power quality

DC to DC Cometer (DC Chopper) -

Electric vehicles (EVs), Hybrid metric Vehicles (HEV) and Fuel Cen Elect Vehicles (EV) have been typicaly proposed to replace conventional vehicles as the sortutas DC-DC converters can be used to interface the elements in the electing power train by boosting or chopping the voltage overs

DC-to-DC converters are used to reduce High voltage DC put to tow vantage DC output for some specific appliances. They are also used to isolate some highly sensitive components in a circut from other components of the circuit to cold any kind of damage

Electric vehicles (EV) use two different power systems a high-voltage bomery (200 to 400 VDC) for traction and a low-voltage (12V) one for supplying all the electric appliances in the vehicle Traditionally the love-voltage bottery was charged from the oterator, but in today's vehicles gets its power hom the high voltage battery pitor However, in specific electric car architectures this low voltage battery should be ready to help recharge the high-voltage bottery pack in order to provide energy for cranking the car. This means that the on-board DC-DC converter must be bi-directional and very efficient as we highly reliable in order to rurs the complex control algorithms needed to ensure on energy-micient soupon

AC to DC Converter

It's called the onboard charger though it really is a converter It converts power from AC to DC and then feeds it into the car's Dottery This the most common charging method for electric vehicles toddy and most chargers use AC power

DC to AC Convater

The DC to AC conveter is required to convert the do power to sutab ac power for alectico machine the power ouput from the battery pack (DC current) is converted using inverter to be used in electric motor AC current

Converts direct current (DC) from the battery to catemating curent (AC) to be used by other devices such as the traction motor and point pump

2. what is steady stole speed if outy cy70% and The other parameters of the ctric vehicle is given below, Motor and controller parameters

Rated Armature voltages 72V

Rated mature current 400 A

Ra=0.50,K=0.7 volt sec

Chopper Switching frequency=400 Hr

Theory:

V output = Vhattery 15 shered is duty cycle

The Vaupotituted in equation of mattor speed

Where

= angular speed in (racion/sec)

Ro=armature resistance

= motor constant (volt sec)

T=torque Nm

Then we get the equationsuttuting the of the value and gut the equation in terms of T and

ω

ω of the motor

and Venice torque equation is given in terms of T and ω

ω

at steady stone torque at vehicle and torque of motor is equal with that condition we find

ω