Will increase damage motor

[Todd]

hi all,
If the power limit was increased to 20mph from 15mph on the control meter panel on a 8fun 2500w
Will this cause any damage to the motor ???

 

[Todd]

Opps that's 250w motor !

 

[trex]

have you done it? it shouldn't damage the motor but it may cause you trouble with the police.

 

[Todd]

Yes it's hardly noticeable it has only taken the cut off away and only increased the speed to 16.5mph. Here in London never see any police anyway

 

[jonathan75]

I think the thing to be aware of is if you're going up a hill, then, if the motor is trying to go faster but can't (because it's not powerful enough), AND if maximum power is being put into it (you'll see this in bars on your LCD display I believe), then I gather this extra electricity which is going into the motor (?) but not generating any extra power output, is generating heat instead, and can ultimately make the motor overheat after a period. This could be a short period if it was a very steep hill, maybe a longer period if it was less steep.

So in principle raising the speed limit can mean the motor is running hotter for longer going up hills at high levels of assist. Although that's probably mostly down to the assist level.

I think the key on those hills to avoid motor damage, is to have the assist level and bike gears, at such a setting that the power bar isn't putting out the maximum. Or walk up. Maybe others will correct me.

 

[selrahc1992]

I think the thing to be aware of is if you're going up a hill, then, if the motor is trying to go faster but can't (because it's not powerful enough), AND if maximum power is being put into it (you'll see this in bars on your LCD display I believe), then I gather this extra electricity which is going into the motor (?) but not generating any extra power output, is generating heat instead, and can ultimately make the motor overheat after a period. This could be a short period if it was a very steep hill, maybe a longer period if it was less steep.

So in principle raising the speed limit can mean the motor is running hotter for longer going up hills at high levels of assist. Although that's probably mostly down to the assist level.

I think the key on those hills to avoid motor damage, is to have the assist level and bike gears, at such a setting that the power bar isn't putting out the maximum. Or walk up. Maybe others will correct me.

i vaguely recall d8veh saying 10mph is fine, 8mph perhaps and 6 mph not for a long steep hill(but OK for a short one), FWIW my 250w motor is derestricted and up long to me rather steep hills (around two miles) at maximum power (only around 650 watt to be fair with its 18A 36V controller) there is absolutely no discernible heat when I touch it

 

[Deleted member 4366]

Removing the speed limit doesn't make any difference to the power, so can't damage the motor in any way. With a hub-motor, the faster you go, the better it is for it. With a 250w crank-drive motor, you could be running at your maximum power more of the time, so you would use up the battery quicker, but there's no chance of damaging the motor.