Lorax

What? Pure Electric vehicle that plugs in to charge its batteries

   1.   How Fast? 75-80 mph (can keep up with traffic on the interstate) 

   2. How much horsepower does it have? 34 hp electric 

   3. How much Torque? 75 foot pounds at the motor, 900 pounds at the drive wheels (Front wheels) 

Difference Between Horsepower and Torque: 

Horsepower- Energy in Motion (Maintaining a speed requires a certain amount of HP

Why Three Wheels?  

Less friction and lighter (less friction than 4 wheels) and with less friction the car uses less energy, so it is more energy efficient. It is lighter with one less wheel and one less axle.

What does the solar cell on the car roof do?

Keeps a 12 volt battery charged which powers the Solectria Controller. It has no effect on charging the 12 – acid Deka batteries

Body of the Car

British kit car based on the 1930’s 3 – wheeled Morgan (Lomax kit car).

Frame: Citroen Deux Chevaux ( which means Two Horses in French)

What type of brakes?

Inboard disc brakes in front and a single drum in the rear.

Regenerative Braking: When slowing down, the motor acts as a generator and the controller takes electricity from the motor and uses it to recharge the batteries (5-7% of the energy is returned).

Tell me about the batteries?

PbA (lead Acid battery) H2S04 – Sulfuric Acid

They are deep cycle batteries. They can hold a larger charge for a longer period of time than standard batteries.

GEL Battery – fluid (or acid) has been turned into slush. (A semi – solid). Doesn’t spill.

Gel Electrolyte – The substance through which the electrical current moves from one terminal to the other inside the battery.

They are a lead Acid Gel Battery – 12 volts DC(fully charged 13.6 volts) Useful Range(average between 13.6 and 10.5 volts, 10.5 when completely discharged).

Capacity of Batteries: 79 Amp Hours at the 3 hour rate (100 miles driving would use around 70 amp/hr)

12 batteries (made by Deka) X 69 lbs each = 828 lbs

828 battery weight + car weights 1232 = 2060 lbs total weight of car

Fully floored, 200 amps going into the motor

200 amps(fully floored)

X 144 volts (battery pack )

28,000 Watts

 

(1 HP (horsepower) in electrical terms is 750 Watts)

28,800 Watts/ 750 Watts = 34 HP

When charging the batteries, it is recommended that they are hit with 14.5 volts/battery then float the charge back down to 13.8 volts for charging. The 14.5 volt charge will break up the sulfation that accumulates on the plates. The batteries will last longer and perform better if the sulfation is burnt off.

When charging, these batteries respond best to an inrush current of 30 Amps or more. The charger uses AC current and converts it into 240 volts of DC current.

How does the motor work?

The motor is a 3-phase(3 – wires) AC induction(current is induced) motor. The electromagnetic field inside the motor is going around in a circle and the armature is moving around following the electromagnetic field making the motor move.

The armature is the only moving part inside the motor except for the bearings(the two bearing that hold the armature in place).

What does the controller do?

The controller takes the 144 DC from the batteries and converts it to a 3-phase AC current for the motor.

The 3- phase AC induction uses 3 different phases as pulses. The strength of the magnetic field moves the motor.

The controller takes input and translates them to directions for the motor.

Controller has circuitry in it called soft start which keeps the wheels from spinning. It keeps the acceleration down in in the car which keeps the front wheels under control