I am trying to fix a brake on a mitre saw. I am yet unsure of its operating principle. The switch (shown taken apart) has one terminal on the left side with grey wire going to the motor housing, and two terminals on the right side (black/live wire on the upper terminal, and white/neutral wire on the lower). In the “Off” position the sliding carriage is pushed to the left side, connecting gray and white wire. When saw is turned on, the carriage is thrown to the right side, connecting live and neutral, and starting the motor.
After the lever is released, the switch returns to the “Off” position. At that point the motor supposed to be forced to slow down. I do not know for sure, but I suppose it reverses direction of the magnetic field to resist rotation, until it stops, and because the live wire is not connected, the motor does not spin in the opposite direction, but only stops.
Currently the motor is not being forced to stop, but slowly coasts to stop. I have tested the switch with an Ohm-meter: infinity between black and white terminals in an “Off” position, short in “On” position, reverse situation between grey and white terminals. Upon physical inspection, switch appears to be in perfect order. Therefore, the common purported causes of malfunctioning brake, worn brushes (they look good, and so is the commutator) and broken switch, do not seem to apply here.
How do I troubleshoot the motor? What is the schematic to help understand the operation? What is this switch called (I could not find proper terminology)?