dc motor brake

[bobby b]

Hi, I have a conveyor belt that I’m drive with a 18 volt reversing
drill motor that I have hooked to a 24 dc power supply via a pwm
to adjust the desired speed. I’m using a one shot time delay relay to
start the cycle, then a micro switch to stop the belt, delay timer times out
trips a relay to reverse dc voltage, returning to home, stop by an other
micro switch removing the dc from reverse relay waiting for a new
operator cycle.
My problem I’m having is motor run or coasting going be-on my stops.
which varies depending on the load on the belt. The tool shop drill that
I’m using seems to have a electronic brake built in the trigger, when
releasing it stops the motor with no coasting.. Any one have an ideas
about how to incorporate this electronic brake in my device.
thanks bobby

 

[Roff]

Hi, I have a conveyor belt that I’m drive with a 18 volt reversing
drill motor that I have hooked to a 24 dc power supply via a pwm
to adjust the desired speed. I’m using a one shot time delay relay to
start the cycle, then a micro switch to stop the belt, delay timer times out
trips a relay to reverse dc voltage, returning to home, stop by an other
micro switch removing the dc from reverse relay waiting for a new
operator cycle.
My problem I’m having is motor run or coasting going be-on my stops.
which varies depending on the load on the belt. The tool shop drill that
I’m using seems to have a electronic brake built in the trigger, when
releasing it stops the motor with no coasting.. Any one have an ideas
about how to incorporate this electronic brake in my device.
thanks bobby

Short out the motor momentarily before applying reverse voltage. If it stops too abruptly, use a low-value resistor instead of a short. A short circuit across the motor will make it very difficult to turn.

 

[bobby b]

Hi, will give that a try, thanks again for the tip. bobby