Magnetic read/write head actuator assembly having an actuator motor with dual windings

Abstract

An improved magnetic read/write head actuator assembly for use within a storage disk system that provides reduced average access time. The actuator assembly includes an actuator arm mounted on a pivotal E-block structure. A read/write head is supported at a distal end of the actuator arm such that the head is positioned in close proximity to a rotating magnetic storage disk. An actuator motor cooperates with the E-block structure to provide pivotal motion to the actuator arm about a central pivot axis. The actuator motor includes a pair of rotor windings connected to the E-block structure at an end opposite the actuator arm and stator magnet structure that is statically mounted in close proximity to the rotor windings. The actuator motor further includes a flux conductive member for forming a closed magnetic flux path through the windings and the stator magnets. The pair of rotor winding are oriented in a plane normal to the plane defined by the pivotal angular motion of the actuator assembly. The geometry of the actuator motor windings together with their orientation generates an increased magnetic torque vector force. This increased torque vector force generated by the windings is transposed to the E-block structure for increasing the pivotal speed of the actuator arm about the central pivot axis with no increase in power consumption.