Torque increase

Discussions regarding the Field Oriented Control (FOC) implementation on the VESC.
Ryan Wallace
Posts: 5
Joined: 17 Feb 2017, 03:24
Location: Ottawa Canada

Torque increase

Postby Ryan Wallace » 20 Feb 2017, 23:46

Has anyone noticed an increase in torque using FOC? I'm wondering if a quadcopter would be able to spin larger propellers using FOC.

rew
Posts: 943
Joined: 25 Mar 2016, 12:29
Location: Delft, Netherlands.

Re: Torque increase

Postby rew » 21 Feb 2017, 08:21

In theory there is an increase in efficiency when your motor has sinusoidal back EMF waveforms.

But it is not that the efficiency increases twofold so that you can use 2x larger props.

Ryan Wallace
Posts: 5
Joined: 17 Feb 2017, 03:24
Location: Ottawa Canada

Re: Torque increase

Postby Ryan Wallace » 22 Feb 2017, 03:02

From what I have read people are saying that FOC can increase the efficiency of a motor by about 15%. The limiting factor for motors is heat, so this should mean that you can run 15% more current to generate the same amount of heat. What are people actually seeing in terms of increased power and torque under FOC control if anything? You may have to increase voltage to get the same amount of power, but at the end of the day watts are watts.

rew
Posts: 943
Joined: 25 Mar 2016, 12:29
Location: Delft, Netherlands.

Re: Torque increase

Postby rew » 22 Feb 2017, 09:22

If you are allowed 15% more "waste power" you can only run 7.5% more current. I^2 . R

Ryan Wallace
Posts: 5
Joined: 17 Feb 2017, 03:24
Location: Ottawa Canada

Re: Torque increase

Postby Ryan Wallace » 22 Feb 2017, 17:07

Yes, exactly. I just wanted to see if anyone was observing a noticeable increase in torque and power. Can anyone comment on that?

Hummie
Posts: 110
Joined: 10 May 2016, 04:05

Re: Torque increase

Postby Hummie » 04 Apr 2017, 21:19

On my board it has less power in foc and less speed given the same amp settings.


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