Patent ID: 6548980
Filing Date: 2003-04-15
Classification: E05F,E05Y,G05B

Abstract:
A motor drive apparatus for driving a motor in a forward direction or in a reverse direction by actuating a relay that rotates the motor in the forward direction or a relay that rotates the motor in the reverse direction by supplying power to the motor in response to a forward-rotation command or reverse-rotation command provided by an operating portion, comprising:submersion sensing means for sensing that at least the operating portion of the motor drive apparatus has become submersed; first malfunction sensing means for sensing that one relay of said relays, which is for rotating the motor in a predetermined one direction, has been actuated; and first forcible control means for actuating the other relay in response to submersion being sensed by said submersion sensing means and actuation of the one relay being sensed by said first malfunction sensing means.