- Sun Apr 26, 2020 5:34 am
#20721
There seems to be a method to double the top speed of the m365 from 20MPH to 40MPH while using a modified stock controller.
I have done some testing on m365 with an ebay 1000w 84v controller and two 42v 10s batteries in series (20s 84v max).
The stock motor seems to handle the voltage and speed fine, but the 1000w controller is 3x OEM size and is hard to fit anywhere.
The 60A phase current produced torque makes the FWD scooter unrideable. The sensitive throttle also causes issues. Also, the BMS will cut power above 20A while accelerating due to no OEM ESC current data.
Gently accelerating with about 18A of current will yield a top speed of ~30MPH. However, the cheap $35 Chinese controller is a trapezoidal wave drive unit that makes the motor very loud (whines) and inefficient. The OEM m365 controller uses FOC sine wave control and is silent. I have also tried a $30 500w sine wave controller that was silent, but can only take 80v max before exploding. The sine wave controller also seems to give higher top speed at ~35mph while drawing 18A phase current on flat ground.
The ideal controller would be compact, FOC, sine wave , and 100v max. This can be accomplished by modifying the OEM controller.
I found a video in Spanish detailing the modification steps. From what I can understand:
1. Flash custom firmware with above 60km/h speed limit, remove KERS, and add above 84v override(unsure if needed).
2. Remove the ESC control board from housing.
3.On the ESC board, cut the Positive PCB trace going from the XT30 connector to the 63v Capacitor positive terminal.
(VERY IMPORTANT. This will isolate the STM32F Controller and 5v DC converters from the 84v battery supply. ESC and BLE boards will blow if not isolated.)
4. Remove the 63v capacitor on the control board.
5. Add a 100v capacitor to replace the 63v capacitor. Connect the negative lead to the negative capacitor pad and connect the positive lead to the positive of the XT30 input. (The positive capacitor pad should be disconnected from the positive XT30 input at this point)
6. Connect two 36v batteries in series using XT30 series connector harness and plug into XT30 input on ESC.
7. Connect the positive of the 1st 42v battery to the positive capacitor pad on ESC board. (This will supply 42v to power the MCU and 5v DC converters isolated from the main 84v battery pack.)
8? Replace the six MOSFETs with 100v 120A IRFB4110 MOSFETs (Maybe not needed. The default MOSFETs are already 100v 110A STP15810.)
9. Profit???
Based on this Spanish guy's poor quality video:
https://www.youtube.com/watch?v=CfD5VDL ... -0&index=2
I used YouTube auto-translate captions to understand the audio.
Maybe a Spanish speaker can understand better and see if I missed or got any steps wrong.
Has anyone else tried this method? I'm ready to test it; just need to get the parts.
I have done some testing on m365 with an ebay 1000w 84v controller and two 42v 10s batteries in series (20s 84v max).
The stock motor seems to handle the voltage and speed fine, but the 1000w controller is 3x OEM size and is hard to fit anywhere.
The 60A phase current produced torque makes the FWD scooter unrideable. The sensitive throttle also causes issues. Also, the BMS will cut power above 20A while accelerating due to no OEM ESC current data.
Gently accelerating with about 18A of current will yield a top speed of ~30MPH. However, the cheap $35 Chinese controller is a trapezoidal wave drive unit that makes the motor very loud (whines) and inefficient. The OEM m365 controller uses FOC sine wave control and is silent. I have also tried a $30 500w sine wave controller that was silent, but can only take 80v max before exploding. The sine wave controller also seems to give higher top speed at ~35mph while drawing 18A phase current on flat ground.
The ideal controller would be compact, FOC, sine wave , and 100v max. This can be accomplished by modifying the OEM controller.
I found a video in Spanish detailing the modification steps. From what I can understand:
1. Flash custom firmware with above 60km/h speed limit, remove KERS, and add above 84v override(unsure if needed).
2. Remove the ESC control board from housing.
3.On the ESC board, cut the Positive PCB trace going from the XT30 connector to the 63v Capacitor positive terminal.
(VERY IMPORTANT. This will isolate the STM32F Controller and 5v DC converters from the 84v battery supply. ESC and BLE boards will blow if not isolated.)
4. Remove the 63v capacitor on the control board.
5. Add a 100v capacitor to replace the 63v capacitor. Connect the negative lead to the negative capacitor pad and connect the positive lead to the positive of the XT30 input. (The positive capacitor pad should be disconnected from the positive XT30 input at this point)
6. Connect two 36v batteries in series using XT30 series connector harness and plug into XT30 input on ESC.
7. Connect the positive of the 1st 42v battery to the positive capacitor pad on ESC board. (This will supply 42v to power the MCU and 5v DC converters isolated from the main 84v battery pack.)
8? Replace the six MOSFETs with 100v 120A IRFB4110 MOSFETs (Maybe not needed. The default MOSFETs are already 100v 110A STP15810.)
9. Profit???
Based on this Spanish guy's poor quality video:
https://www.youtube.com/watch?v=CfD5VDL ... -0&index=2
I used YouTube auto-translate captions to understand the audio.
Maybe a Spanish speaker can understand better and see if I missed or got any steps wrong.
Has anyone else tried this method? I'm ready to test it; just need to get the parts.