| 摘要 |
PROBLEM TO BE SOLVED: To absorb external force such as water hammer, return the open/close state of a shutter, simplify a structure, save space, reduce cost, and save energy. SOLUTION: The rotary shaft of a shutter mechanism is connected to the side of the rotating shaft 63 of a torque motor 26, and the open state and close state of the shutter mechanism are selectively switched. The torque motor 26 includes a rotor 62 supported by the rotating shaft 63 extending in the same direction as the rotary shaft. A stator 61 is provided with a main tooth portion 65a projecting toward the rotor 62, auxiliary tooth portions 65b, 65c, and a coil 66 fitted to the main tooth portion 65a. The rotor 62 is provided with permanent magnets 77, 78 attached to a rotor core 76 and having different magnetic poles. The rotating direction of the rotor 62 is changed over by a control section 27 controlling power distribution to the coil 66. The shutter mechanism 13 is positioned and retained at a predetermined position by attraction of at least the permanent magnets 77, 78 and auxiliary tooth portions 65b, 65c. COPYRIGHT: (C)2011,JPO&INPIT
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