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Electric Drive Design for Hyundai Creta

The document summarizes the specifications and calculations for an electric drive system designed for a Hyundai Creta vehicle with a maximum speed of 100 km/hr. It determines the required motor power output of 20.68 kW from the vehicle specifications and aerodynamic and rolling resistance forces. A 25 kW brushless DC motor rated at 72V and other specifications is selected to meet the power requirements. A 96V 200Ah lithium-ion battery pack is selected to power the motor. Calculations show the battery can propel the vehicle up to 70 km at 100 km/hr or 92.34 km at 50 km/hr.

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Kabilan
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165 views2 pages

Electric Drive Design for Hyundai Creta

The document summarizes the specifications and calculations for an electric drive system designed for a Hyundai Creta vehicle with a maximum speed of 100 km/hr. It determines the required motor power output of 20.68 kW from the vehicle specifications and aerodynamic and rolling resistance forces. A 25 kW brushless DC motor rated at 72V and other specifications is selected to meet the power requirements. A 96V 200Ah lithium-ion battery pack is selected to power the motor. Calculations show the battery can propel the vehicle up to 70 km at 100 km/hr or 92.34 km at 50 km/hr.

Uploaded by

Kabilan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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KABILAN S KARUNAKARAN P NIKHIL ANAND T RAGESH T

CB.EN.U4EEE16115 CB.EN.U4EEE16121 CB.EN.U4EEE16131 CB.EN.U4EEE16144

ELECTRIC DRIVE SCHEME FOR HYUNDAI CRETA

CAR DIMENSIONS & WEIGHT


Projected frontal area Af (1.78 x 1.63) m2
Drag coefficient Cd 0.36
Gross Weight (Kerb Weight + occupants) m 1700 kg
Rim Diameter 17” (or) 0.4318 m

TYRE SPECIFICATIONS
Section Width 215 mm
Aspect Ratio 0.6
Outside Diameter (2x Section Height + Inside 690 mm
Diameter)

Air Density (ISA standards) ρ 1.225 kg/m3


Rolling resistance coefficient Crr 0.015
Gravity g 9.81 m/s2
Vehicle inertial mass mi 1.04 * 1700 = 1768 kg

Let’s limit the vehicle’s maximum speed to be 100 km/hr (27.78 m/s)
1
Aerodynamic Drag (Faero) = ρCd Af V2 = 493.72 N
2
Force due to rolling resistance = mgCrr = 250.15 N
--------------
Total Tractive Force = 743.87 N

Power required to attain maximum speed = (743.87 * 27.78) = 20.66 KW


Torque required on the wheels = (743.87 * 0.690 * 0.5) = 256.6 Nm

Differential gear ratio = 3.62;

Torque produced by the motor = 256.6 / 3.62 = 70.90 Nm


Speed of the motor = ( 20.66 / 70.9 ) * 9.55 = 2785 rpm
Output Power requirement = 20.68 KW.
Input power to the motor for an efficiency of 88% would then be 23.5 KW.
A Brushless DC Motor with the following ratings have been chosen.
>> Power Rating : 25KW
>> Speed Rating : 3600 rpm
>> Torque Rating : 80 Nm
>> Voltage Rating: 72 V
>> Dimensions : (30 x 30 x 25) cm
>> Weight : 40 Kg

• The motor is powered from a 96V 200Ah 20KW battery pack.


>> Size : 301x175x342 mm
>> Weight : 37 Kg

Upon assuming 88% efficiency for the motor,


Power input to the motor (Pin) = 20.66/0.88 = 23.5 KW
Input Current = 244.80 A

The Discharge time for 85% of the battery pack would then be
td = (200*0.85)/244.80 = 0.70 hr
The vehicle would have then travelled 70 km at a speed of 100 km/hr.

For a speed of 50 km/hr, the total tractive force would is 374 N.


Power to be supplied in this case would be 10.4 KW.
For the rated 96V, input current = 108.3 A
therefore, td = 1.85 hours
Distance covered = 92.34 km.

Fig. Schematic of a Battery Electric Vehicle

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