I have seen some mentions of this in other posts about Hall sensors, but I haven't found a post just about this. Some of the other comments make sense and others don't so I thought I'd do a post just on this subject.
I am setting up an older ebike that has a good motor with a new controller. The new controller has six wires on the Hall connector and the white one is for a speed signal. I guess some bikes have four Hall sensors and one is a dedicated speed sensor and the other three signal the position and the controller uses that to know which phase wires to energize when.
So my question is can I take one of the Hall wires other than the red and black one out of the connector and replace the terminal and add another short wire and terminal and jump this wire to the vacant spot on the motor side Hall connector housing to provide a signal to the white wire?
I've read you can do this, but I've seen some things about having to add a resistor and other things about it will only measure speed when the motor is running.
This controller works with a display and the display has a switch which turns the controller (and display) on and off. The speed shows up on the display. I think the other poster meant to say the speed will only be displayed when the controller is on and not the motor. The Hall sensors all have a +5V and a ground wire and the third wire is the signal which passes from the transistor when the magnet switches it. So while there will only be a signal when the wheel is moving, the Hall sensors will all have power whenever the controller is turned on (assuming it is hooked up right). As for the stuff about needing to add a resistor, I think that may have been something specific to the particular system they were discussing.
Well that is my understanding anyway. I won't have this all together for a bit anyway, so I thought I might as well post it.
This controller also has another pair of wires for a "speed sensor" of the coil and magnet on a spoke variety. I do have an old wired sensor I can use, but I'd like to keep the number of wires and things that can get caught on things as low as I can. I also want to mount this on the chainstay. The controller fits in a small compartment on the frame by the bottom bracket so I have plenty of wire and that location is more out of the way. But if I can just use the Hall wire method that would be one less wire.
The sensor I have was used and is probably for a front fork. I don't know how well it will work on the chainstay. The only way to adjust the distance from the sensor to the coil is by where on the spoke you mount the magnet. I suppose it will work.
That sort of leads to another related question. I have another bike with a Bafang BBSHD mid drive. It uses a chainstay mounted speed sensor. It can be adjusted in and out. It also has a three pin connector on it, so I assume it uses a Hall sensor rather than a coil to get the signal pulse. It won't work directly, but it seems like if I tie into some other +5V from the controller when it is on (throttle, brake, etc) I could use this and the ground wire to power it and the remaining pin would be the signal pulse and I'd hook that to the non-ground wire of the speed sensor connector on the controller.
I don't have one of those sensors and they cost almost $20 and my other options are free so I'm not looking to do that, but I figured it ties into this discussion.
So I may or may not be right about this, please let me know. Thanks.
I am setting up an older ebike that has a good motor with a new controller. The new controller has six wires on the Hall connector and the white one is for a speed signal. I guess some bikes have four Hall sensors and one is a dedicated speed sensor and the other three signal the position and the controller uses that to know which phase wires to energize when.
So my question is can I take one of the Hall wires other than the red and black one out of the connector and replace the terminal and add another short wire and terminal and jump this wire to the vacant spot on the motor side Hall connector housing to provide a signal to the white wire?
I've read you can do this, but I've seen some things about having to add a resistor and other things about it will only measure speed when the motor is running.
This controller works with a display and the display has a switch which turns the controller (and display) on and off. The speed shows up on the display. I think the other poster meant to say the speed will only be displayed when the controller is on and not the motor. The Hall sensors all have a +5V and a ground wire and the third wire is the signal which passes from the transistor when the magnet switches it. So while there will only be a signal when the wheel is moving, the Hall sensors will all have power whenever the controller is turned on (assuming it is hooked up right). As for the stuff about needing to add a resistor, I think that may have been something specific to the particular system they were discussing.
Well that is my understanding anyway. I won't have this all together for a bit anyway, so I thought I might as well post it.
This controller also has another pair of wires for a "speed sensor" of the coil and magnet on a spoke variety. I do have an old wired sensor I can use, but I'd like to keep the number of wires and things that can get caught on things as low as I can. I also want to mount this on the chainstay. The controller fits in a small compartment on the frame by the bottom bracket so I have plenty of wire and that location is more out of the way. But if I can just use the Hall wire method that would be one less wire.
The sensor I have was used and is probably for a front fork. I don't know how well it will work on the chainstay. The only way to adjust the distance from the sensor to the coil is by where on the spoke you mount the magnet. I suppose it will work.
That sort of leads to another related question. I have another bike with a Bafang BBSHD mid drive. It uses a chainstay mounted speed sensor. It can be adjusted in and out. It also has a three pin connector on it, so I assume it uses a Hall sensor rather than a coil to get the signal pulse. It won't work directly, but it seems like if I tie into some other +5V from the controller when it is on (throttle, brake, etc) I could use this and the ground wire to power it and the remaining pin would be the signal pulse and I'd hook that to the non-ground wire of the speed sensor connector on the controller.
I don't have one of those sensors and they cost almost $20 and my other options are free so I'm not looking to do that, but I figured it ties into this discussion.
So I may or may not be right about this, please let me know. Thanks.