Limited angle electric rotary actuator

Details Limited angle electric rotary actuator Limited angle electric rotary actuator

H - Electricity

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H02K 24/00 (2006.01) H02K 3/47 (2006.01) H02K 33/18 (2006.01) H02K 57/00 (2006.01)

Patent

CA 1157504

LIMITED ANGLE ELECTRIC ROTARY ACTUATOR FOR OPERATING MAGNETIC READING HEAD ABSTRACT An electric rotary actuator, for producing rotation through a limited angle, comprises an internal stator having a common cylindrical surface around which is disposed a plurality of circumferentially spaced magnetic pole faces. A flux return means, together with the stator, forms a circuit that includes a magnetic flux gap of annular cross-section between the pole faces and the flux return means. An external non-magnetic cylindrical shell rotor, having an electrically conductive winding, is co-axially located in the flux gap, the winding comprising a number of loop coils arranged edgewise in a more or less continuous cylindrical structure so that each pair of axially extending portions of adjacent coils lies opposite a respective one of the pole faces. The stator comprises a number of axially extending permanent magnet segments the outer faces of which define the common cylindrical surface of the stator, and a central magnetically permeable core on which magnet segments are mounted; the flux return means comprising a cylindrical shroud surrounding the loop coils; and the shroud being slotted between magnet segments. UK9-79-008 . . ,

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