| http://www.w3.org/ns/prov#value | - One opening of each coil 21, 22 faces perpendicularly to the shaft A. As shown in the figure, two winding terminals b, d located respectively at the opening of each coil 21, 22 are connected to each other through a switching element, such as a transistor Q1, and other two winding terminals a, c located at the other opening of each coil 21, 22 are electrically connected directly.
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