Apps.ElectricVehicle History

March 06, 2010, at 02:40 AM by 206.180.155.75 -
Changed lines 9-10 from:

(:html:)<font size=1><pre>

to:

(:html:)<font size=2><pre>

Changed lines 64-65 from:

(:htmlend:)

to:

(:htmlend:)

April 23, 2009, at 10:32 AM by 158.35.225.231 -

(:html:)<font size=1><pre>

Electric Vehicle Model

Model car

```  Parameters
! motor parameters (dc motor)
v   = 36        ! input voltage to the motor (volts)
rm  = 0.1       ! motor resistance (ohm)
lm  = 0.01      ! motor inductance (henrys)
kb  = 6.5e-4    ! back emf constant (volt-sec/rad)
kt  = 0.1       ! torque constant (N-m/a)
jm  = 1.0e-4    ! rotor inertia (kg m^2)
bm  = 1.0e-5    ! mechanical damping (linear model of friction: bm * dth)

! automobile parameters
jl = 1000*jm    ! vehicle inertia (1000 times the rotor)
bl = 1.0e-3     ! vehicle damping (friction)
k = 1.0e2       ! spring constant for connection rotor/drive shaft
b = 0.1         ! spring damping for connection rotor/drive shaft
rl = 0.005      ! gearing ratio between motor and tire (meters travelled
!  per radian of motor rotation)
tau = 2         ! time constant of a lag between motor torque and car
!   velocity.  this lag is a simplified model of the power
!   train. (sec)
End Parameters

Variables
i     = 0       ! motor electrical current (amps)
dth_m = 0       ! rotor angular velocity sometimes called omega (radians/sec)
th_m  = 0       ! rotor angle, theta (radians)
dth_l = 0       ! wheel angular velocity (rad/sec)
th_l  = 0       ! wheel angle (radians)
dth_v = 0       ! vehicle velocity (m/sec)
th_v  = 0       ! distance travelled (m)
End Variables

Equations
lm*\$i - v = -rm*i -    kb *\$th_m
jm*\$dth_m =  kt*i - (bm+b)*\$th_m - k*th_m +     b *\$th_l + k*th_l
jl*\$dth_l =             b *\$th_m + k*th_m - (b+bl)*\$th_l - k*th_l

tau * \$dth_v = rl * dth_l - dth_v

dth_m = \$th_m
dth_l = \$th_l
dth_v = \$th_v
End Equations
```

End Model

</pre></font> (:htmlend:)

November 03, 2008, at 09:05 PM by 98.199.241.177 -
Changed line 3 from:
to:
November 03, 2008, at 08:36 PM by 98.199.241.177 -
Deleted lines 2-11:

The principal input to the model is the voltage to the motor. Motor parameters include resistance (ohm), motor inductance (henrys), back emf constant (volt-sec/rad), torque constant (N-m/a), rotor inertia (kg m^2), and mechanical damping. The automotive parameters include vehicle inertia, vehicle damping (friction), transmission dynamics, gearing ratios, and a simplified model of tire friction on the paved surface. The electric vehicle models tracks system including:

• motor electrical current (amps)
• rotor angular velocity sometimes called omega (radians/sec)
• vehicle velocity (m/sec)
• distance travelled (m)

The principal input to the model is the voltage to the motor. Motor parameters include resistance (ohm), motor inductance (henrys), back emf constant (volt-sec/rad), torque constant (N-m/a), rotor inertia (kg m^2), and mechanical damping. The automotive parameters include vehicle inertia, vehicle damping (friction), transmission dynamics, gearing ratios, and a simplified model of tire friction on the paved surface. The electric vehicle models tracks system including motor electrical current (amps), rotor angular velocity (radians/sec), rotor angle (radians), wheel angular velocity (rad/sec), wheel angle (radians), vehicle velocity (m/sec), and distance travelled (m).

November 03, 2008, at 08:34 PM by 98.199.241.177 -