| 摘要 |
PURPOSE: To suppress a rise in temperature in a coil and to obtain an inexpensive shuttle mechanism due to the elimination of a cooling duct by using a space formed by a magnet, a coil and a coil base plate as a cooling duct. CONSTITUTION: To reduce leakages of cooling air running through an air duct 5. In a shuttle, the bent part of a yoke 3 is made to approach a coil base plate 4. While the coil base plate 4 is reciprocating, a gap large enough to prevent the coil base plate 4 from touching the yoke 3 is secured. Contrary to the conventional arrangement, a radiation hole of the coil base plate 4 is blocked, and a space surrounded by a coil 1, a magnet 2, the yoke 3 and the coil base plate 4 is used as a cooling air duct 5 in the shuttle. In consequence, since the coil 1 as a source of heat is used as a part of the air duct by delivering air by a blower 7, etc., to the cooling duct, cooling efficiency improves. |
