Model Boat Mayhem
Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: rathikrishna on December 28, 2010, 12:36:48 pm
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Friends, all we know, that, one of the real threat, while playing with RC ships and boats is MOTOR stalling, means jamming of the motor with many reasons.first one is stranding the propeller on anything from a weed to nets, and jamming brush also can cause stalling. the jamming of the armature,makes ample of heat, as it drops a high degree of Amperage, cause potentialy disastrous results.one of the ever simple damage inflicted by this incident is burning of the ESC we used. a heavy money loss will occur instantly. here i am posting a simple proven circuit, for years, to protect our entire unit.
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as we can see here, some simple components are used.here transistor BC77 ,metal case acts as a temperature sensor,as its leakage current differs ,accordance with the temperature it stands.this variation is used for biasing an other transistor,and triggering circuit.BC 108 is used as a buffer amp between the sensor and triggering circuit.AC 128 is used to drive a relay here.we can simply adjust the temperature by adjusting the 470Kilo Ohms potentio meter.we can use any general purpose transistors here, but take care to take only metal case transistors as sensors.
how it helps us..?
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Here the answer...when a stalling occur, a great heat will produced on the ESC, and motor itself.so we now theres always will be a safest maximum temperature levels, as we use our crafts in water.we can simply fix the metal cased transistor, on ESC, or motor by a simple aluminium clamp or by a screw.then we can adjust the value of the biasing voltage by reseting the 470 K ohms resistor.
we can set the preset, just above the maximum temperature after running our craft for several minutes.so when a high heat sensed by the sensor it triggers the other.instantly the relay energised. opening the DC voltage line to the ESC circuit. so we can save our ESC and motor simultaneously.
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Hi Rathi, Can you draw a wiring diagram please, thanks a lot. Geoff.
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Hi Rathi, Please disregard my last post. I've just seen the diagram on the other thread. Regards, Geoff
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Rathi has been rather quiet since being confirmed as a male.
Bob
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Rathi has been rather quiet since being confirmed as a male.
I'm not surprised, I imagine it would come as a bit of a shock to anyone..... :}
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Hi all, I see that the personal details suggest female still. I don't think that gender should be of concern to us but the o/p of Rathi has shown that it does.
Personally, as a male dancer (what connotations there, I wonder!) I much prefer not to be the one dancing backwards.
Still, nice to see the enthusiasm, but honesty also has its merits.
kind regards Roy