dogman wrote:... You never know if it's the motor cutoff, or you just bounced the wiring loose, or maybe you just smoked the controller. 15 min later, Yay, it was just the cutoff. But I'd worry for 15 min.
dogman wrote:You never know if it's the motor cutoff, or you just bounced the wiring loose, or maybe you just smoked the controller. 15 min later, Yay, it was just the cutoff. But I'd worry for 15 min.
In this case, when the motor stopped, it would freewheel, so it wasn't a big deal. With a dd, you'd get a bit of unexpected "regen brake effect" so it might take a bit of getting used to. I doubt it would toss you over the bars though.
I just think that you do still want some kind of warning that it's about to happen. Perhaps a wire still needs to exit the motor, so you can still have a temp readout.
Alan B wrote:No Wire Motor Temperature Measurement Techniques
1) make a circuit that goes in the motor that modulates the current the hall circuit draws based on motor temperature. Sense this current in the +5 lead with an external circuit. A simpler version could use a thermal switch and resistor to make the hall circuit draw more current, and detect this change to give a simple "overtemperature" output.
transmit the temperature information with RF
Hyena wrote: 180oC ? Would a 160oC thermal....
Alan B wrote:... Can we get one more very small conductor out of the motor? ...
Alan B wrote:...
If we want to keep the electronics in the motor to a minimum the RF method is probably not a great choice. The temperature near the axle should be lower than near the windings so I would put electronics near there, the sensor would go on the windings to see the max temperature.
full-throttle wrote:What he's saying is: the Halls consume 1mA (just for example) normally, when the thermal switch trips it could add a resistor across the power rail adding another 1mA.
icecube57 wrote:How come we cant use a thermal breaker like the ones used in nicad packs to just kill the whole 5v. It would break the connection and kill power to to the motor and to restore power would require the motor to cool down.
Having a breaker thats around 120C-150c. This would leave the bike dead in the water but by you pulling the signal down with the resistor it seemed kinda harsh and abrupt .... have u rode with this implementation yet?
Alan B wrote:If you connect the thermistor inside the motor in series with the power lead to the hall sensors, where can you measure the voltage at the node? The node you want to measure is inside the motor, no wires from that node leave the motor. The regulated 5V line coming from the controller should not be affected by this thermistor, it is a regulated voltage.
John in CR wrote:I'm in a different situation with unknown temp sensors already in the motor with wiring for the sensor coming out with the wiring harness. I need to figure out how to take advantage of it.
i'd rather add an extra tiny wire, going to the CA, with a neat little display of the temp, with programmable treshold and alarm ? or why not, pulling down the amps automatically
i don't remember seeing much CA programming on the forum, is it possible at all ? there would be other things to add to that little box...
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