[bArray]

Very interesting, thank you! Do you have more information I can read about phase weakening and BLDC control algorithms?

I ask because I happen to be designing a BLDC motor controller, I am aware of using the back EMF to measure the motor phase, but never considered it as a force slowing the motor down. As a software engineer by trade I was hoping I could perhaps dynamically switch between the two control techniques to get low-end torque and high-end speed? I was also hoping to setup the controller to optimize the various parameters for the specific motor it is controlling by measuring the back EMF.

Any help is greatly appreciated :)

[balfirevic]

Read this: https://krex.k-state.edu/dspace/bitstream/handle/2097/1507/J...

It's a thesis from James Mavey titled "Sensorless field oriented control of brushless permanent magney synchronous motors".

Other good resources:

http://build-its-inprogress.blogspot.com

http://discourse.odriverobotics.com/

https://things-in-motion.blogspot.com

[natermer]

Check out endless-sphere.com. There are people there doin home-built motors and designing controllers. 99% of the content is just people messing around with their bicycles or arguing over silly things, but there are a few very highly technical people.

Also there is a open source motor controller called VESC from Vedder Electronics.

http://vedder.se/2015/01/vesc-open-source-esc/

It's a modern controller with FOC modes and such things.

Originally designed for electric skateboards it has gone through many revisions and is a viable commercial product. The developer has a official vendor for buying the design, but there are many clones and variations of different prices and quality.

There are people on endless-sphere working on variations to scale it up for larger EVs.