justin4u wrote:I have a question about the review at the top of the thread. On level ground both motors could hit 40mph. Why only 11/13 mph going uphill? What is the limiting factor battery, controller, or motor.
In my experience with electric motors in the RC world they will draw as many amps as required to spin at the rated KV
100KV motor (100 rpm per volt)
This system will draw 20Amps and spin the prop at 1200 rpm
If you increase the size of the prop to 15Ã¢â‚¬Â the rpms will remain the same but the Amp draw will increase to 40Amps.
justin4u wrote: If the system is over loaded three things can happen
1) the motor moves outside of its efficiency curve and generates heat instead of power
2) as the amp draw on the battery goes up the voltage starts to drop until you hit a low voltage cut off
3) The controller limits the system to XX Amps
dirtdad wrote:I used the 600W high torque with 72V and 20 and 40A controllers. Note that this voids the warranty. No problems in several months of use. 72V with the high torque motor produces speeds just over 30mph. With 40A it accelerates like a kick in the pants and climbs hills with nary a complaint.
I just today switched to the 1000W motor for testing. It seems to have similar speed/Volts as the 600W high torque with both the 20 and 40A Crystalyte controllers I have. Supposedly it delivers higher speed above 40A.
BMC and others are working on a bigger controller to mate up with the 1000W motor, and I will try a stock 18FET Infineon eventually.
How many miles would you estimate you put on at 72V 20/40A? In what type of terrain? Stop and go, or just cruising? What is your estimate of average load (bike+rider+cargo) weight?
Are you able to compare 0-10 mph and 0-20 mph times for the 600W high torque and the 1000W high speed with the same a battery and controller? Have you also tested the 600W high speed model? How does it compare?
Also, it's not clear on the website, but do you sell the 600W speed or torque model?
Do you know if the difference between the speed and torque model for 600W extends beyond gear reduction ratio? I'm trying to figure out if it is the exact same motor with a different gear ratio or not (info is hard to come across).
Any info is appreciated.
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