| 摘要 |
PURPOSE:To enable strengthening of a drive turning power and to reduce the number of components and the number of processing works, by a method wherein a toroidal magnetic path plate is split, a toroidal core is placed on a surface where the split magnetic path plates are positioned facing and opposite to each other, and two magnetic circuits are formed in parallel. CONSTITUTION:Toroidal magnetic path plates 1', a part of which is opened, are placed at an upper and a lower side, and toroidal permanent magnets 2' are secured to the surfaces of the plates 1' positioned facing and opposite to each other. A toroidal core 3', whose one end is open, is located at a center of a space between the permanent magnets 2' and at a distance of a gap B between the core and the magnet, and forms a magnetic path together with a magnetic path segment 4'. A magnetic circuit forms two parallel circuits through the gap B, and electromagnetic powers, acting on two horizontal surface of a moving coil 6 in the upper and the lower gap B, are added to each other to obtain a strengthened drive turn power. |
