Well, got a lot of spare parts for my scooter. Enough spare parts to ensure that it will last for the next couple of years.
The motor control unit is pretty impressive. 24 MOSFETs. 12 for the front wheel, 12 for the rear wheel. 4 MOSFETs per phase. 2 MOSFETs from phase to the positive rail. 2 MOSEFTs from the phase to the negative rail.
The MOSFETs sit on small PCBs located below the CPU PCB.
The two large connectors halfway up the L.H. side are for the battery to plug into.
The motor phases attach to the threaded posts adjacent to the Blue, Brown, and Yellow markings.
The Motor Control Unit looks after driving the motors in the wheels, reading the hall effect sensors in the wheel for speed / distance / torque / traction control.
The Motor Control Unit also looks after the dynamic braking and the regenerative braking for the two motors. And the Motor Control Unit also looks after switching between 1-wheel-drive and 2-wheel-drive as well as switching between the eco / speed / racing modes.
These are the front end components. L.H. brake level, R.H. brake lever, L.H. switch pod, R.H. switch pod, throttle assembly, and speedometer display. missing are the two front turn signals and the front head light.
I learnt something interesting about the scooter.
It’s literally drive by wire.
That small 5 pin connector that I’m hold is the power source for the front end, and the communication link between the front end and the motor control unit.
The Display CPU not only drives the transparent OLED display, it also encodes the throttle position, the brake statuses, the speed modes, turn signals, horn, and power switch and transmits this data to the CPU on the motor control unit.
The bluetooth interface is actually a daughter board on the Display CPU.
The Display CPU receives data from the motor control unit and displays the speed of the scooter, the power consumption of the motors, the power level of the batteries, and other miscellaneous data.
What surprised me the most is that it’s only a simple serial communication link between the Motor Control Unit and the Display CPU. One transmit line, one receive line, and a signal ground.
Not really too interested in what section does what, but either the Motor Control Unit or the Display CPU looks after the cruise control function. The Display CPU looks after the front turn signals, the front running light, and the high beam / low beam headlight. The Motor Control Unit looks after the rear brake light / running light, the rear turn signal lights, and the addressable effect lights on the rear of the scooter.
Seeing as how Segway discontinued this scooter, I’m going to grab up most of the parts that the dealers are clearing out.
I don’t really want to buy a new scooter in the next year of two.
And keeping this unit going should be pretty easy.
I don’t think that the battery pack is going to fail. I rarely charge it above 80%, never go below 10%, and for the most part the scooter is in a climate controlled environment. I also don’t use the dual chargers very often, the slow 8 hour charge time is good enough for me.
Items I might still get?
Maybe a spare front and rear wheel, the turn signal pods, and maybe the headlight.
Beeshive 