| 摘要 |
The present invention realizes improved workability of electrical connection between an exciting coil and a circuit board disposed in a casing and ensures waterproofing of a connection portion. A waterproof case 25 in which a terminal bar 24 is buried is composed of a large-diameter portion 25 a in a hollow bottomed-cylindrical shape and a small-diameter portion 25 b around whose outer peripheral surface an O-ring 27 is fitted. A U-shaped end of the terminal bar 24 connected to an end of an exciting coil 7 is positioned in the hollow portion of the large-diameter portion 25 a, part of a substantially linear portion extending from the U-shaped end of the terminal bar 24 is buried in the small-diameter portion 25 b in an axial direction, and the other portion of the terminal bar 24 protrudes from the small-diameter portion 25 b. An end of the other portion is soldered to a circuit board 4, and the small-diameter portion 25 a of the waterproof case 25 is fittingly inserted in a cylindrical fitting portion 26 formed in the casing 1, whereby water-tightness is ensured.
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