General discussion

Hey there!

I have been running BLDC for a while now and getting up to 43kmh but I just switched to FOC and I cannot get a speed above 18kmh.

My setup is the Flipsky 6.6+, dual motor control. The duty cycle is hitting 95-100% and I have tried programming for medium and small motors, and also programming with and without the timing belt installed. So far, still getting this 18kmh speed limit. I saved the settings and according to the mobile app the max speed is 87kmh so I don't know why I'm being speed limited.

So I'm trying to get FOC to play nice and realized that the autodetected motordata changes a lot with different input voltages etc.

On 4.12 @20V I get:

• 30.6mOhm
• 41.40 uH
• 21.388mWb
• 2.19 O.G

A200S V2 @62V:

• 29.6mOhm
• 50.96uH
• 23.293mWb
• 1.84 O.G

So not that far off since it's on different hardware. But when i do my own measurements we see values far off the "autodetected" ones:

VESC 6, controlling 1000w 8in hub motor with 18 in tire. No load added. ~50v power suppply.

Motor runs OK in hall mode (i set sensorless ermp to 8000, 6000erpm is the max RPM this motor can reach)

If i set sensorless model to 2500 or 1500 ermp, motor knocks really bad when reaches that speed and fails to accelerate. I tried doubling and halving observer gain, motor runs somewhat OK when observer gain is reduced 10x from what its detected value is 0.6 to 0.04

I would appreciate the ideas to solving this tracking problem

Hello All,

I am fairly new to the VESC. 

I want to understand how the VESC is capable of a closed loop position mode, where it controls the motor through position feed back and desired position.

Standard industrial controllers have velocity mode, position mode, and torque mode. 
Most of the videos online seem to just talk about Velocity mode for the VESC, where you input a speed and the motor tries to get there as fast as possible (depending on the current limit, etc.).

Hello Guys,

For the past few days i have been trying to read data from VESC 4 using an Arduino Mega into the serial monitor. As a first approach, I am using VESC Tool (v1.012) to command the VESC and then send the data to the Arduino, so far unsuccessfully. For context, the Hardware version is 4.10 and Firmware is 3.56. Below follows a list of the things that I have already tried, which might give you light on what i am maybe missing here:

From the VESC Tool:

-Used UART app combinations (UART, PPM+UART, ADC+UART)

From the hardware:

Hi

I'm working on converting a sailboat to electric drive and I just need to make sure I'm not doing anything stupid here...

The setup I'm thinking of:

Hello Everyone,

I have renew a old Electric ATV for Kids, i took out the old motor, and i put 70KV 80100 Outrunner. Which connected to 48V 30Ah (120A Peak) Lithium Pack.

The VESC6 software works fantastic.

I dont know where to connect the reverse driver button ? Which port it belong too ? ADC2 ?  and should i give 3.3V or 5V or just GND signal ? to where?

Thank you in advance. 

Astro

Hi,

I have a modified VESC with higher input resistor values.(Flashed the latest firmware and changed the R1 and R2 values). However i'm having a weird issue. Sensorless FOC works flawlessly. BLDC detection usualy succedds but the given setting never work (Cycle Integrator Value Aprox. 900 and BMF Coupling Value Aprox. 5000) and hall sensor detection almost always fails. I have tried various current, duty cycle, ERPM setting without any success. When i try to use FOC in sensored mode the initial acceleration is quite rough. What could be the issue any ideas? 

Hi,

I would like to know how to select the value for the DC-link capacitor. I have read some articles and I have gained some understanding. It is mainly the ripple current rating of the capacitors that will be the deciding factor. But I do not know how to calculate the ripple current value for vector control (FOC). 

Is there any document that I can go through?

It would be great if someone can share their thoughts on this topic.

Thanks

Hello,