Concepts for eBike Propulsion 2
This is more of a technical issue, but very often the Hall Effect Ebike Throttle can break and it's good to know how to replace the broken sensor by knowing a little about them.
The default voltage for these sensors is actually half the supply voltage.
The throttle then will have opposite facing polarity magnets on either side as the thing turns so that on the extremes the voltage varies from high to low.
Notice that the voltage never drops below 1 volt or go above 4 volts.
By comparison the typical potentiometer will vary the voltage from 0 volt to 5 volts.
So you can see why it's tricky switching to a different type. (the ranges are different)
You can buy these sensors as a batch of ten for 99 cents and save money on replacement throttles.
Any slight voltage surge when connecting the battery can potentially burn out one of these sensors and my experience is that they they do break fairly often.
Try a google search using "ss49e ebike".
Remember that 19 phase motor idea?
As a motor the electronics would be excessively complex.
So I was looking at a bunch of Wind Power Generator youtube videos and realized that with a generator there is far less to worry about as far as control compared with a brushless motor. In fact, all you need is to wire it so that each phase is part of a massive center tap and you can then use simple diodes to drive the AC to DC rectification.
This would allow a bigger diameter disc to make better use of the magnets you would buy. (more spread out)
19 phases would mean 19 diodes... and that's it.
This guy did it:
A 10 kW permanent magnet electric generator has been built and tested for use with a high TSR, 5 m blade diameter wind turbine. The system was configured for 15 phase, 15 coils and 16 poles. Each coil is individually rectified to dc, reducing cogging and allowing better control over the output voltage. Total cost of the generator was AU$873 and was constructed with typical home-workshop tools.
Homopolar Water Pump Motor.
The problem with the Homopolar motor is figuring out how to conduct electricity from the center of the spinning disk to the external fixed position. One typical solution is to use mercury to act as the conductor. (that or brushes)
This idea inverts the logic.
Rather than spin a disk you "spin the water" or more accurately a water solution with high electrical conductivity.
You now have a "pump".
Water pressure could then drive a hydraulic system that actually drove the bicycle like a motor.
Friction becomes water friction as there are no moving parts.
This is an idea that's really nice because it's relatively easy.
You can buy an Adult Tricycle for $300 at Walmart.
Then with foam and fiberglass you can build solar panels for the sides and top.
Fenders are replaced by the sides.
The front and back and part of the sides are left open to the air so as to reduce cross winds from tipping the tricycle over.
Each panel surface would operate separately, so as you rode around you would boost the voltage depending what sun power you are getting.
Whether the top should be flat, curved or segmented is unclear. Flat would be easier I suppose. And if this is done with foam, fiberglass and the solar panels themselves the weight will be trivial
We are born with ten fingers and eyes that see light in straight lines.
From that we invent the Matrix which we call the Cartesian Coordinate System.
But in reality nature never goes in straight lines... the real reality is like Magnetism and operates on a coordinate system that is very bizarre.
Space is actually curved like a vortex back onto itself.
* What if a motor were designed with a vortex like shape?
FEMM Simulations actually don't show the true shape of nature. (we aren't made aware of spin)