Electrical generator or motor structure – Dynamoelectric – Linear
360105, H02K 4100, G11B 554
A magnetic circuit structure in a rotary actuator which can reduce the inductance of a coil while negligibly reducing a magnetic flux density between gaps. The magnetic circuit structure includes an E-shaped main yoke formed by integrally connecting a curved inner yoke, a curved center yoke, and a curved outer yoke. The E-shaped main yoke is manufactured by stacking a plurality of rolled steel plates. An inner magnet is mounted on the outer circumferential surface of the inner yoke opposed to the center yoke, and an outer magnet is mounted on the inner circumferential surface of the outer yoke opposed to the center yoke. A side yoke is magnetically attached to the open end of the E-shaped main yoke. A through hole extending in parallel to the axis of rotation of the rotary actuator is formed at a circumferential central portion of the center yoke.
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LaBalle Clayton E.
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