miniaturizing the VESC for smaller motor and less functionality

General topics and discussions about the VESC and its development.
Posts: 16
Joined: 06 Sep 2017, 12:12
Location: Florida

miniaturizing the VESC for smaller motor and less functionality

Postby BlakeCarmichael » 30 Oct 2017, 16:21

Hi all,

I am working on a project that utilizes a 300 W motor (may upgrade to ~400 W) and I have been using the VESC. I am using UART from an Arduino Mega to control the motor. I would like to detune the VESC such that it is cheaper and smaller than the current VESC. The BLDC tool and open-source nature of the VESC are what got me using the VESC in the first place. Also, I needed an ESC that could run my motor with large startup torques.

My specifications are not 100% solidified but are approximately the following:
    maximum continuous current draw: 15 A
    voltage range: 20-30 V (using 7s4p lithium-ion battery)
      BLDC tool
      Duty Cycle Control
      Current Control
      I do not need PPM, analog, I2C, or CAN-bus control over the motor - only UART and USB
      FOC is not required
      Read via UART the following:
        input voltage
        motor current
        duty cycle now
        amp hours burned
        input current
Motor control will be sensorless

I would imagine that the above requirements give me the ability to remove a lot of components, and replace many components with better-suited components that are cheaper/smaller.
I am curious if anything similar to this has been done before?
I plan on going through the schematic and the BOM to figure out which components to remove or replace.
I know that there may not be exact replacements for some parts, and rather than spend a bunch of time doing redesign, I may leave some components in the design even if they are overkill for my requirements. The goal of this is to balance design time with cost and size.

I have done PCB design before using EAGLE but all my projects have been a bit less complex than the VESC. I have started to learn KiCad recently.
If anyone has tips for me to get started, it would be much appreciated!

Posts: 35
Joined: 24 Apr 2016, 10:20

Re: miniaturizing the VESC for smaller motor and less functionality

Postby linsus » 31 Oct 2017, 12:59

If you search the forum abit, thera are some that have made smaller verisions of the VESC that have been succesfull. Have a look around. ;)

viewtopic.php?f=9&t=1513 <- example

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