How to generate hall signals from a sensorless hubmotor?
- Thread starter e-doc
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Dauntless
100 TW
I'm typing with my thumbs, so I mean to be short. But usually the real experts won't touch a discussion that sounds too outlandish, it being a thankless task when some people become irate. So let me try to redirect you and let you prove you'll listen to them, maybe they'll join in.
So you don't want to use a sensorlessi controller, but don't want to add hall sensors. I've tried for years to get the college classes to learn about this with no luck. I've read of putting an encoder on your shaft that will give the position, which is the direction I hope to go in. Mr. Physics used some different terminology talking about the Deathbike that led me to believe he was using such a system. Would that sound good to you?
http://endless-sphere.com/forums/viewtopic.php?f=30&t=54918
So you don't want to use a sensorlessi controller, but don't want to add hall sensors. I've tried for years to get the college classes to learn about this with no luck. I've read of putting an encoder on your shaft that will give the position, which is the direction I hope to go in. Mr. Physics used some different terminology talking about the Deathbike that led me to believe he was using such a system. Would that sound good to you?
http://endless-sphere.com/forums/viewtopic.php?f=30&t=54918
I try to modify a sensorless hubmotor (Keyde) with defective internal controller to be operated by an external controller.
My only controller is an Infinion/Lyen type for use with sensored motors.
Someone from Austria tried to add internal hallsensors to his Keyde motor without success.
http://www.pedelecforum.de/forum/showthread.php?20326-Hilfe-Reparatur-eines-KEYDE-Frontnabenmotors&p=346647#post346647
I don't want to make the same mistake, so I'm looking for an adapter board that generates "hall sensor compatible" signals from back EMF (induction voltage) by the 3 motor windings.
Somewhere I saw a schematic diagram of a sensorless controller that had comparators to generate some position signals, but I cannot find that schematic diagram again...
@ferret
This motor is an "in-runner" type as you can see here : http://www.pedelecforum.de/forum/showthread.php?20326-Hilfe-Reparatur-eines-KEYDE-Frontnabenmotors&p=346652#post346652
I don't think there is strong enough magnetic stray field of the rotor you could use for external hallsensors.
Xrain
100 W
Usually your controller has to be set up for running sensor-less. A add on board to get the position information for the controller will end up being almost as complicated as the motor controller itself.
This is because you need to know which two phases are getting driven with current and which one is going to give you the voltage pulse you need. This is much easier if done on board the controller since it is the one driving the phase lines. And then make the output act like it is a hall sensor. So I would either buy a sensor-less controller, or just add hall sensors to your motor.
This is because you need to know which two phases are getting driven with current and which one is going to give you the voltage pulse you need. This is much easier if done on board the controller since it is the one driving the phase lines. And then make the output act like it is a hall sensor. So I would either buy a sensor-less controller, or just add hall sensors to your motor.
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