KatieBot III utilizing Wheeleez Wheels

4-wheel Drive, 4-wheel Steering ultimate off-road wheelchair. The KatieBot III was created out of necessity in order for my 12 year old daughter Katie to enjoy the beach. Katie is a T8 complete paraplegic and getting around on the beach was tough for everyone. Enter the KatieBot. The KatieBot is an electric four wheel drive buggy. It uses four MY1016Z 24V, 250 watt electric scooter motors as its power source. The total torque produced is around 115 ft-lbs (thats alot!). Motor control is via my own custom h-bridge motor controller capable of 80 amps @ 30 volts continuous duty. The main power source is two 12 volt 28 AH SLA batteries with a quick disconnect. Steering is also electric utilizing two 24 volt hi-torque windshield wiper motors and rack-and-pinion gear boxes. As a result the buggy has 4-wheel steering allowing for a tight turning radius. Motor control is also via my own custom motor controller. My daughter drives the buggy via a joystick adapted from an electric wheelchair. The electronics of the controller were removed and replaced with my own. The joystick unit controls the acceleration/deceleration of the buggy insuring safe stops and starts. The joystick unit also controls the speed of each wheel independently. This insures that during a tight turn the inner wheels turn at a slower rate than the outer greatly decreasing tire skip and wear. And since my wife won't let me use my daughter as a test pilot (go figure...) the buggy has a 2.4GHZ wireless link with ...

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