| US 7,582,993 B2 | ||
| Motor having reverse rotation preventing unit | ||
| Seung-Do Han, Incheon (Korea, Republic of); Seung-Suk Oh, Gwangmyeong (Korea, Republic of); Jae-Hong Ahn, Anyang (Korea, Republic of); Hyoun-Jeong Shin, Incheon (Korea, Republic of); and Dong-Il Lee, Bucheon (Korea, Republic of) | ||
| Assigned to LG Electronics Inc., Seoul (Korea, Republic of) | ||
| Filed on Jun. 13, 2006, as Appl. No. 11/423,724. | ||
| Claims priority of application No. 10-2005-0052058 (KR), filed on Jun. 16, 2005. | ||
| Prior Publication US 2006/0284500 A1, Dec. 21, 2006 | ||
| Int. Cl. H02K 7/10 (2006.01) | ||
| U.S. Cl. 310—41 [310/68 E] | 13 Claims |
| 1. A motor having a reverse-rotation preventing unit, comprising:
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 that moves the ratchet unit using a restoration force to a locked position when the secondary rotor
is stationary, and moves the ratchet unit to an unlocked position when the secondary rotor is rotating using a centrifugal
force generated by the rotation of the secondary rotor.
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