Patent ID: 8786997

Claim:
A non-excited operation type electromagnetic brake control device which controls a non-excited operation type electromagnetic brake in an engaged state, a disengaged state, or a holding state, comprising: a brake coil which generates magnetic attraction force to switch said non-excited operation type electromagnetic brake from the engaged state to the disengaged state; an acute triangle voltage wave generator configured to generate a stepped acute triangle voltage wave which is comprised of a plurality of valley parts each of which having a first angle, and a plurality of peak parts each of which having a second angle smaller than said first angle, arranged alternately; a comparative voltage wave generator configured to generate a comparative voltage wave based on current which flows through said brake coil; a comparator configured to compare a value of said acute triangle voltage wave to a value of said comparative voltage wave when said non-excited operation type electromagnetic brake is in the holding state; and a switch configured to supply current to said brake coil when said comparator judges that said acute triangle voltage wave value is larger than said comparative voltage wave value, and to cut off the supply of current to said brake coil when said comparison unit judges that said acute triangle voltage wave value is not larger than said comparative voltage wave value.