| 摘要 |
PURPOSE: A bobbin structure is provided to allow for ease of assembly of bobbin regardless of temperature change, and prevent a deformation of bobbin caused due to overheat of motor. CONSTITUTION: A bobbin(8) wound with an exciting coil has a cut-out portion(84) formed at the top of the bobbin. The cut-out portion is formed by cutting upper blades and inner surface of the bobbin. The bobbin has a connection portion(85) opposed to the cut-out portion. The connection portion is formed by cutting lower blades and connecting the inner surface of the bobbin through a thin slot. Thus-obtained semi-spherical bobbins(8a,8b) are spread centering from the connection portion. The blades of only one of the semi-spherical bobbins have protrusions(86a,86b).
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