STEPPING MOTOR WITH ELECTROMAGNETIC BRAKE

PROBLEM TO BE SOLVED: To provide a stepping motor with an electromagnetic brake, which is used as the driving source for an elevating/lowering device, etc., and can be started smoothly, when the power supply is restored after a power failure, etc. SOLUTION: A stepping motor is provided with a de-energized starting electromagnetic brake 10. On the abutting surfaces of a fixed brake section (armature 15) and a mobile brake section (hub 12) of the brake 10, which come into contact with each other when the brake 10 is actuated, plural triangular wave-shaped teeth 12a and 15a which have the same period as that of the angle-torque characteristic of the rotor of the stepping motor and are meshed with each other are formed in the form of bevel gears the pitch planes of which overlap upon another in a circular plane, so that the teeth 12a and 15a are meshed with each other on the stable point A of the angle-torque characteristic.