Patent ID: 9697866
Date: 2017-07-04
CPC Classifications: G11B

Claim:
1. A device for measuring pitch and roll torques of a hard disk drive (HDD) voice coil motor (VCM), the device comprising: a sensor plate having a horizontal cross member, a vertical cross member and a surrounding member connecting ends of the horizontal member and the vertical member, wherein the horizontal cross member and the vertical cross member intersect each other at a centre region of the sensor plate; a VCM coil attached to the sensor plate and configured to generate a pitch torque and a roll torque when an electrical current is applied to the VCM coil; a first strain gauge attached to a surface of the horizontal cross member and configured to detect a horizontal strain caused by the pitch and roll torques generated by the VCM coil; and a second strain gauge attached to a surface of the vertical cross member and configured to detect a vertical strain caused by the pitch and roll torques generated by the VCM coil.