micromobility - Ebikes, scooters, longboards: Whatever floats your goat, this is micromobility
Ebikes, bicycles, scooters, skateboards, longboards, eboards, motorcycles, skates, unicycles: Whatever floats your goat, this is all things micromobility!
"Transportation using lightweight vehicles such as bicycles or scooters, especially electric ones that may be borrowed as part of a self-service rental program in which people rent vehicles for short-term use within a town or city.
micromobility is seen as a potential solution to moving people more efficiently around cities"
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Focus on discussing the idea, not attacking the person.
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For sure, I agree with this. However, that's not how current PEVs are designed, so wattage seems to always linked to raw power and speed (this is a selling feature, no doubt), which isn't what you want/need in an urban environment when most places have laws that restrict motors to under 500w and speeds to 25km/h or slower. LOL
Having witnessed e-scooters before the advent of hyper scooters, I was optimistic in their future. But it seems like "low-end" (i.e. legal) e-scooters are being pushed away for electric racing motorcycles without seats. And nobody wants those around pedestrians or on bike paths. E-bikes have already become a problem in too many cities, and we don't need more backlash because of other overpowered PEVs.
Wattage is amps times voltage.
Voltage determines motor RPMs, amperage determines torque. (Simplified)
50V at 60A is 3000 watts, but so is 25V at 120A.
But the system configured to run at 50V can achieve twice the speed of the one at 25V. The 25V system is also 3000W, but all it can do with that is achieve its top speed really fast.
It's a bit more complex than that. At lower speed the higher cmvotage system can function like the lower voltage one, as at low RPM and therefore low motor voltage the ESC can pump up the amps while remaining within the power limit of the battery (up to the amperage limit of the motor), but once the ESC is pushing the voltage coming out of the battery right into the motor, there is no going faster even with watts to spare. Maintaining speed doesn't take as much energy as accelerating, so as you hit top speed, power consumption actually goes down.
Unless you sacrifice the amps/torque/acceleration to gain voltage/top speed, more power doesn't mean a faster PEV.
I imagine one would have a motor controller that included something along the lines of a variable frequency drive (VFD) and a boost converter for something in the 4.5KW range, which would largely mitigate the issue and open up the door to using a small forklift battery as the foundation of a motorcycle.
I'm not aware of any BLDC ESCs that implement boost conversion.
Looking it up it seems such a circuit would be beefy indeed when built to handle the amperages of propulsion.
Controlling the voltage coming out of the battery is already done using pulse width modulation, but this can only reduce the voltage, not increase it.
There's little point in boosting the voltage to achieve higher top speed, as configuring a battery pack for voltage is very easy.
To the point that I'm here lamenting that PEV designs are upping the top speed even when utterly unnecessary.
I was joking, yout silly potato. The forklift battery thing was supposed to be a tipoff.
Why would there be anything wrong with a forklift battery?
A battery pack is a battery pack.
Drop an /s next time.
Forklift batteries are also ballast. They're lead-acid and weight 600lbs at the minimum. It's a comically bad idea to use one for a personal vehicle.
Thanks. I'll go ahead and file that under "obvious common knowledge" going forward. /S
I know how lithium packs work and how to program a VESC. That's all.