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| Electrical Issues: Hatch Lift - Battletech Pod - Tail Gate Lift Motor |
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| lilshawn:
--- Quote ---So with either resistance sensors or plane threshold sensors the clutch would break the motion of the motor in milliseconds which, if you watch it slow motion would not remove a finger but crimp/bruise it. --- End quote --- i would imagine a system properly installed in a car would monitor the amperage being drawn from the motor whilst opening or closing, if it exceeds a pre-determined threshold, the motor stops and reverses direction. perhaps a similar setup could be employed with this motor with an amp shunt and an AVR or PIC programmed to monitor both the forward and reverse direction and choose a threshold appropriately. the ampere shunt will "output" a millivolt diference dependent on the load applied to the circuit. example: the motor whilst opening will encounter a great increase in amp load if something gets in the way and stops it. **normally 5 amps but will spike to 11amps if obstructed** the motor whilst closing will experience a significant drop in amp load then great increase in load. (ie pinched finger) **normally 1 amps (due to weight of door) but drops to 0.3 amps then spikes to 11 amps** this system could stop and reverse once >2 amps is seen or once the spike is seen. |
| kahlid74:
--- Quote from: PL1 on January 26, 2013, 12:29:58 pm ---Looks like your main problem will be with the area outlined in red. Most of that length will probably just need an almost full-depth 45 degree chamfer like the diagram on the right. If that doesn't quite clear the upper fixed edge, you can cut the edge back and use countersunk aluminum flat stock on the door to bridge the gap. Scott --- End quote --- So I did this and it didn't work well enough. So I'm probably going to have to move things a little bit and see if I can get it to function. I didn't get much time tonight to futz with it but come Thursday I'll have lots of time. --- Quote from: lilshawn on January 29, 2013, 08:52:34 pm --- --- Quote ---So with either resistance sensors or plane threshold sensors the clutch would break the motion of the motor in milliseconds which, if you watch it slow motion would not remove a finger but crimp/bruise it. --- End quote --- i would imagine a system properly installed in a car would monitor the amperage being drawn from the motor whilst opening or closing, if it exceeds a pre-determined threshold, the motor stops and reverses direction. perhaps a similar setup could be employed with this motor with an amp shunt and an AVR or PIC programmed to monitor both the forward and reverse direction and choose a threshold appropriately. the ampere shunt will "output" a millivolt diference dependent on the load applied to the circuit. example: the motor whilst opening will encounter a great increase in amp load if something gets in the way and stops it. **normally 5 amps but will spike to 11amps if obstructed** the motor whilst closing will experience a significant drop in amp load then great increase in load. (ie pinched finger) **normally 1 amps (due to weight of door) but drops to 0.3 amps then spikes to 11 amps** this system could stop and reverse once >2 amps is seen or once the spike is seen. --- End quote --- Interesting thoughts. Challange is that the Clutch is on a different system than the motor. So the clutch diengages and then the power needs to be cut from the motor, then reversed and then re-engaged. I like what your saying thought. Should be feasible through the arduino. |
| danny_galaga:
--- Quote from: lilshawn on January 29, 2013, 08:52:34 pm --- --- Quote ---So with either resistance sensors or plane threshold sensors the clutch would break the motion of the motor in milliseconds which, if you watch it slow motion would not remove a finger but crimp/bruise it. --- End quote --- i would imagine a system properly installed in a car would monitor the amperage being drawn from the motor whilst opening or closing, if it exceeds a pre-determined threshold, the motor stops and reverses direction. perhaps a similar setup could be employed with this motor with an amp shunt and an AVR or PIC programmed to monitor both the forward and reverse direction and choose a threshold appropriately. the ampere shunt will "output" a millivolt diference dependent on the load applied to the circuit. example: the motor whilst opening will encounter a great increase in amp load if something gets in the way and stops it. **normally 5 amps but will spike to 11amps if obstructed** the motor whilst closing will experience a significant drop in amp load then great increase in load. (ie pinched finger) **normally 1 amps (due to weight of door) but drops to 0.3 amps then spikes to 11 amps** this system could stop and reverse once >2 amps is seen or once the spike is seen. --- End quote --- --- Quote from: danny_galaga on January 25, 2013, 07:48:04 pm ---Oh, and with the clutch. Just had a thought. If it needs to be powered on to engage, you could hook it up to an automotive pop out circuit breaker, say 15 or 20 amps. If the hatch overloads because you got your neck stuck in there (we'll miss you Kahlid!) then it'll pop and hatch is free. Of course you'd definitely want struts because if it popped near fully open, then the lid might slam down hard. --- End quote --- SAAL (simplify, and add lightness ;D) |
| kahlid74:
The biggest thing right now is getting the door to open/close with the side part. I'm still not 100% with what to do on this sucker. I thought a bunch last night and had resolved to take about 1/4 to 1/3" off the problem angle but I still wonder if that would even work. It might make more sense to just remove the side door and then redo it only phased slightly out so it can pop out. Ugh. I had a lot of time to think last night with the little guy up most of the night with a nasty cold. As a side note, I've started programming the Arduino. I'm going to actually use the rocker switch with the Arduino as a first test, so that the Arduino uses both relays (one for on/Off and one for polarity). Once I build that into a function I'll be able to copy/paste it into the Keypad section and we should be all set. Something I'd really like to do is have a weight sensor on the seat so when the door closes and > 75lbs is on the seat initiate ---smurfette--- Betty "Reactor Online, Sensors Online, Weapons Online, All systems nominal" through the speakers. Only problem is I'm not sure if Arduino can do this. So I may wind up using a Raspberry Pi with the GPIO for this. Just something I was thinking of that would really add ambiance. |
| BadMouth:
I'd make the door slightly oversized and rest on the outside of the main body. An easy way to appease the safety police would be to join the main part of the door to the part that's being lifted by hinges on top. Maybe sprung hinges. The door should still stay rigid as it is being lifted, but if something gets interferes on the way when it's closing, the motor will keep moving to the closed position, but the springs on the door will keep it from crushing fingers (anymore than the weight of the door could crush fingers). |
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