differences between 48v 1000w 72v 3000w

[hardgore]

i just bought ebike kit from someone and it look like typical aliexpress gearless hub motor for fatbike it written 42v 1000w
but i have 72v 3000w battery back there so if i buy 72v controller can i use it on 42v 1000w motor?
whats the differences between 72v 3000w and 48v 1000w motor even the price is almost same like bit more expensive for thicker wiring of course
or with entire kit just 20-50$ more expensive for controller and thats all?
i believe there less magnets and coils inside 42v motor and 72v has more i guess
and comparing 42v 1000w hub motor from electric scooter its way tiny and light weight and how that thing is equal as bicycle hub motor that way larger heavier
to thinking about tiny wheel of scooter that runs with 1000w looks like my bicycle hub motor can take triple more power than that if i open it up and replace wires like10-12AWG wires for all 3 phases
i wanna make sure before doing that

 

[Elios.pk]

A "3000W" often have a larger stator or "Magnet height" compared to a regular "1000W" motor. This would allow the motor to be able to handle more heat (power) for a longer period of time. Also, since the magnets are larger, I think the magnetic field is also stronger so your "power saturation" point will be higher. I recommend asking the supplier what is the magnet height of your motor before making your decisions. Also ask for the power curve / performance test of the motor to know if they used garbage components in order to save costs but while reducing performance/efficiency.

TLDR a 1000W motor will overheat quickly if used with higher powers and will also have a sooner saturation point were you get diminishing returns in power gains.

If price, fitment and weight are not limitations for you, I would highly suggest buying a more powerful motor. Ideally one with the dual hall sensors since they can handle a lot of power (often have large stators) and you have a spare sensor in case one fails (this can eventually happen and is a struggle to find someone to change it for you).

 

[99t4]

OP You may find this detailed article interesting and helpful:

Futility of Motor Power Ratings

"There's no such thing as a rated watt!" Read here for why we don't advertise a simple power rating for the motors we sell. Also, have a look at our Youtube video where Justin talks about the power to propel bicycles in <a href="https://www.youtube.com/watch?v=ALde6zhLPs0">"School of Watts"</a>.

ebikes.ca

Generally speaking, running a motor at a higher voltage increases the top RPM.

 

[E-HP]

whats the differences between 72v 3000w and 48v 1000w motor even the price is almost same like bit more expensive for thicker wiring of course

The difference is one motor can run at 3000W indefinitely under the test conditions the motor’s manufacturer uses to determine the rating, while the 1000W motor can run indefinitely under that manufacturer’s test conditions, which may or may not be the same. Voltage has no relevance.
When voltage is stated, it’s only to describe what voltage the motor is run at for the other specs described, specifically speed. So if the listing says the motor will go 25 mph using a 26” wheel, that’s assuming 48v for instance. The same motor run at 72v would go 72/48 x 25 = 37.5 mph.
The power rating can be increased by adding cooling modifications to a motor since waste heat is the primary factor that determines the motor’s rating.