Hi guys. So as the title suggests i'm looking for ideas. The application is a portable, battery operated power tool which requires repair due to burnt out contacts in the trigger mechanism. The tool has a variable speed in both forward and reverse which is determined by the trigger position, when the trigger is fully released the contacts should close and short the motor, creating the dynamic braking, it's these contacts that have burnt out.
The motor is DC 20v and as mentioned above is run through a speed control which i'm presuming is working as a variable resister rather than pulsing, the forward and reverse feature is part of the trigger assembly but seems to be a simple switch that reverses the polarity to the motor.
I'd like to recreate the dynamic braking with a compact electronic solution that will fit inside the tool if possible, so while the trigger is outputting to the motor in any speed in forward or reverse the motor contacts are open, as soon as the trigger outputs 0v the motors terminals are shorted and braking occurs. It was mentions that perhaps a triac might be a possible solution but this is far from something im familiar with, hence me creating this thread.
Any ideas welcome and appreciated!
The motor is DC 20v and as mentioned above is run through a speed control which i'm presuming is working as a variable resister rather than pulsing, the forward and reverse feature is part of the trigger assembly but seems to be a simple switch that reverses the polarity to the motor.
I'd like to recreate the dynamic braking with a compact electronic solution that will fit inside the tool if possible, so while the trigger is outputting to the motor in any speed in forward or reverse the motor contacts are open, as soon as the trigger outputs 0v the motors terminals are shorted and braking occurs. It was mentions that perhaps a triac might be a possible solution but this is far from something im familiar with, hence me creating this thread.
Any ideas welcome and appreciated!