Question

Consider an EV with the following details. Total mass = 1200 kg, front area = 2 m2, aerodynamic drag coefficient = 0.25 and tire rolling friction coefficient = 0.02, air density = 1.25 kg/m3, acceleration due to gravity = 10 m/s2. Equivalent mass for rotational mass can be taken as 6% of total mass. The wheel is connected to a three phase induction motor with a gear. Gear efficiency is 0.9. Induction motor is operating in constant torque region. The vehicle starts from rest and linearly reaches velocity of 80 km/hr in 10 seconds.



1)Power at the wheels is
A) 7144 W
B) 64.4 kW
C) 6429.6 W
D) 71.5 kW

2)Power at the motor shaft is
A) 71.56 kW
B) 6429.6 W
C) 79.5 kW
D) 7937.78 W

3)Tractive effort at 10 sec is
A) 3218.1 N
B) 3058.3 N
C) 10570.3 N
D) 3232.54 N

Answer 1

Answer:

Consider an EV with the following details. Total mass = 1200 kg, front area = 2 m2, aerodynamic drag coefficient = 0.25 and tire rolling friction coefficient = 0.02, air density = 1.25 kg/m3, acceleration due to gravity = 10 m/s2. Equivalent mass for rotational mass can be taken as 6% of total mass. The wheel is connected to a three phase induction motor with a gear. Gear efficiency is 0.9. Induction motor is operating in constant torque region. The vehicle starts from rest and linearly reaches velocity of 80 km/hr in 10 seconds.

1)Power at the wheels is

A) 7144 W

B) 64.4 kW

C) 6429.6 W

D) 71.5 kW

2)Power at the motor shaft is

A) 71.56 kW

B) 6429.6 W

C) 79.5 kW

D) 7937.78 W