| 摘要 |
PROBLEM TO BE SOLVED: To provide a noncontact drive motor capable of continuously keeping a noncontact state even when starting or in stop and also having semipermanent durability as well. SOLUTION: The drive motor comprises a sleeve 20 wherein the center of a housing 10 is upwardly extruded, a stator assembly 30 that is a combined unit of a core and a coil the both of which are fixed at an external-peripheral surface of the sleeve, a rod shaft 40 rotatively inserted into the sleeve, a rotor assembly 50 comprising a rotor case wherein the top of the shaft is connected to the center thereof and a drive magnet 52 attached to the peripheral-edge part of the rotor case, a first magnet 60 attached to the upper part of the inside-diameter part of the sleeve, a second magnet 70 connected to the external- peripheral surface of the shaft on the same horizontal line of the first magnet, a disc-shaped third magnet 80 connected to the lower part of the shaft having a diameter larger than the outside diameter of the shaft, a fourth magnet 90 upwardly separated from the third magnet with a predetermined height and attached to the inside-diameter part of the sleeve and a fifth magnet 100 that is downwardly separated from the third magnet with a predetermined height and covers the lower part of the inside-diameter part of the sleeve. |
