Seagate Technology Incorporated

Pow-Hing Yong

Xiong Liu

ChoonKiat Lim

Yongjie Tang

Kong Beng Terang Thia

The present invention is a method of determining mass unbalance of an actuator mechanism in a system. The method includes calculating a center of gravity in first x and y components with respect to a first coordinate system of the actuator mechanism. The method also includes calculating the center of gravity in second x and y components with respect to a second coordinate system of the actuator mechanism. The total mass unbalance of the actuator mechanism is then calculated.

Method of determining the mass unbalance of an actuator

An apparatus and method of indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is actuated by a control system is provided. Vibration signals produced at the transducer head while the transducer head follows the track are detected. The half frequency whirl is determined as a function of the detected vibration signals.

Growing community of inventors

Singapore, Singapore

Pow-Hing Yong