anyone tried a hub motor on the razor mx650 or mx500?
Found several the right size 14.5" but not sure the 800 watts mentioned is enough to notice a significant improvement over stock.
I don't know how many watts are required for greater performance. The brushed motor that comes on the off road scooter is 650 watts but we see 1100 watts (36volts at 30 amps) often on a watt meter and I want more power/torque than this. These brushless hub motors would be much more efficient and seem like the perfect match for the Razor MX 400, Mx 500, Mx 550 and MX 650 dirt/grass scooters if they provide enough torque. I'm surprised if no one has tried it. Hesitant to be the first and find it is not an upgrade.
complete kit with twist throttle, brake levers, disc brake, controller, etc
If you wind up performing this modification please keep us up to date on its progress and results.
Both the stock motor and the 1800w motor have 12mm shafts. I cannot tell if both have the same diameter for threads to mount sprocket to motor. Do you know if we can simply remove the sprocket that comes on the 1800W motor and replace with stock one? Is there somewhere to buy a #25 sprocket that will fit to allow same chain and rear sprocket?
Any idea if the motor mounts line up? I can probably make something if not.
Do you know if the 1800 watt motor data for 4400RPM is under load or no load? In RC applications the brushless motors are listed in Kv and it is no load. If it's under load then its fair to assume it would double the speed of the bike as I find it runs at about 2700RPM under load with my son riding at 16mph flat out in level dirt/grass.
Have you come across any performance data for this motor? Watts, amps, volts, rpm or torque?
thanks for your insight. Seems few others know much.
I've ordered the 48v 1800w motor with controller, brake levers and twist throttle. I will install #25 sprocket on it from stock motor. May have to swap sprockets for new ones either larger or smaller to trade speed for torque if it's too fast for my son. Supposed to have in 2 weeks. Will let you know how it goes. Will start with 36v and go up from there. Thanks for the insight, much appreciated.
Thanks for mentioning. I've asked about the cut off voltage. would be nice to be able to select the cutoff voltage like with RC controllers. If not I'll want to order a 36v and a 48v so I can try both
I thought I should warn you about the low Voltage cut off so you can get the right parts. We are looking forward to hearing how this 1800 watt motor upgrade modification goes so please keep us updated on its progress.
ESP Support, thanks fort the info. I have the brushless 48v 1800w motor installed and tested on 36v and today will test higher voltages. I am pretty concerned about the current it draws with the 36v set up. It allows a couple more mph at a couple more amps. It almost seems like power consumption vs speed is linear. I would expect a brushless motor to be far more efficient than the original brushed motor. Any thoughts? I wanted to try a smaller motor sprocket and larger rear sprocket as there may be better efficiency at higher volts but at this rate i'm afraid I'll be at 45A or so at 48v.
Figured it out. The controller limits the current to 30 amps so regardless of voltage it will be just under 30 amps. Next I'll test the "Double Speed" connector to see what that does. Not sure how that will happen if current limited to 30A. Also curious to see what a 13tooth sprocket will do on motor compared to 11.
The half speed connector cuts the controller power output in half when a switch is connected to it and on. This can be used to conserve battery power and get a longer ride time. Some people also use it as a training mode for younger riders. The funny thing is that many scooter manufactures call it a turbo button instead of a half speed button because if you turn it off the speed doubles.