Putting 36 volts on the 48V BBS02 motor

[garman1987]

Hi, can someone help me? After trying a classical 36v 250w controller on the bbs02 750w 48v motor, i have found several problems:
-Controller gets hot quickly without load
-Motor makes a strange vibration when turning on the throttle at 100%
-General speed is too low in my opinion, even considering the battery measured voltage is 37.5 v instead of 51-53 v
-Led display is not able to regulate the 3 assistance level (i'm not using a PAS sensor and i think this is the reason for that)

What i need to understand is:
-Why 36 volts generate this vibration
-Which 48v 500w controller (20 A current on plate) could ensure the perfect work at a good maximum speed

Many thanks if anyone can help me.

This is the video : https://www.youtube.com/watch?v=cOzoyzLUfC8&feature=youtu.be

 

[amberwolf]

Probably wrong hall/phase combo.

See here:
http://endless-sphere.com/w/index.php/Determining_the_Wiring_for_a_Brushless_Motor

 

[neptronix]

Simply not putting enough power into the motor also will cause vibration. 250w barely gets the motor going.

Of course the motor is too slow on 36v. When you decrease the voltage, you decrease the RPM of the motor and also the speed of the cranks.

There is no proper way to make this drive work acceptably on 36 volts, if it is designed to run on 48v. We're not dealing with a hubmotor here.