Motor having device for limiting direction of rotation

• Main Author: LEE DONG-IL,SHIN HYOUN-JEONG,AHN JAE-HONG,OH SEUNG-SUK,HAN SEUNG-DO
• Format: Patent
• Language: English
• Published: 20.12.2006
• Subjects: BLASTING; BRAKES; CLUTCHES; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; COUPLINGS FOR TRANSMITTING ROTATION; DYNAMO-ELECTRIC MACHINES; ELECTRICITY; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERATION; HEATING; LIGHTING; MECHANICAL ENGINEERING; THERMAL INSULATION IN GENERAL; WEAPONS

A motor having a reverse-rotation preventing unit, comprises: a casing; a stator fixedly-coupled to an inside of the casing; a primary rotor rotatably inserted into the stator; a motor shaft coupled to the primary rotor; a secondary rotor having a permanent magnet and rotatably inserted into an air gap between the stator and the primary rotor; a locking unit installed at an inner wall of the casing; a ratchet unit rotatably coupled to the secondary rotor, and locked or unlocked to/from the locking unit when the secondary rotor is forward-rotated or reverse-rotated, for rotating the secondary rotor in a forward direction; and a position setting unit for moving the ratchet unit to a locking position or a unlocking position by a difference between a centrifugal force generated when the secondary rotor is rotated and its restoration force. In the present invention, the motor is only forward-rotated without being reverse-rotated and thus a reliability thereof is enhanced. Furthermore, the number of the components is less and an entire structure is simplified.