Lebowski
10 MW
The pdf attached to this first post describes the technology necessary to build a sensorless FOC controller that can run a motor from standstill or a cold start / reset with full torque. The algorithm it uses to find the rotor phase delivers a continuous rotor angle, not just 6 steps like you get from hall sensors. It can be used to replace a sin/cos sensor.
The pdf contains quite some math, but the method is very 'graphics' based and is hopefully also understandable without the math. The math is necessary though if you want to play around and try to code your own version.
Page 5 to 10 is the TL;DR...
The development of this tech was covered in https://endless-sphere.com/forums/viewtopic.php?f=30&t=94865&p=1389515#p1389515
A video of a BLDC drill running at full torque (pulling through the highest ratched clutch setting), fully sensorless and using the algorithm: (The screw is 14 cm long and if I remember correctly 8 mm thick, drill runs at 50 A amplitude phase current)
[youtube]8Xz3RIYyQIQ[/youtube]
The pdf contains quite some math, but the method is very 'graphics' based and is hopefully also understandable without the math. The math is necessary though if you want to play around and try to code your own version.
Page 5 to 10 is the TL;DR...
The development of this tech was covered in https://endless-sphere.com/forums/viewtopic.php?f=30&t=94865&p=1389515#p1389515
A video of a BLDC drill running at full torque (pulling through the highest ratched clutch setting), fully sensorless and using the algorithm: (The screw is 14 cm long and if I remember correctly 8 mm thick, drill runs at 50 A amplitude phase current)
[youtube]8Xz3RIYyQIQ[/youtube]