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| Trying to figure out a motor control circuit which has a Triac. |
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| Yamin:
Hi, I'm tracing a motor control circuit of a coffee grinder. Nothing is broken just doing it for educational purposes. I do not understand how the following resistors and capacitor is connected and its purpose, it doesn't look right to me as I have not seen it like this before. I am assuming its the snubber circuit. Where is the neutral connection coming into? :S. I haven't continued tracing the rest of the circuit yet. I'm stuck at this point trying to figure out whats happening here. Maybe I'm drawing it in a way that is confusing... The motor is an asynchronous motor. Thanks in advance for the help |
| Yamin:
I have drawn the other part of the circuit (not the gate connection though) and I'm afraid its even confusing more :( |
| soldar:
It has a speed control knob? My guess is that it is a triac phase control and the transformer supplies low voltage to some kind of control circuit. |
| mikerj:
I suspect the main problem is that you've drawn it in a particularly confusing way. The X2 cap and 39k resistor are connected right across the triac in a classic snubber configuration, but that isn't immediately obvious from the diagram as drawn. The 180k is a bleeder resistor to ensure no charge remains on the snubber after power has been removed. |
| soldar:
Have a look at this thread and you can reverse engineer the circuit. https://www.eevblog.com/forum/beginners/pcb-to-scheme/ |
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