User disassembles seagate 320g mechanical hard disk to confirm the existence of voice coil motor. Recently, a netizen in use Seagate Seagate 320G mechanical hard disk hung up, want to use the dead hard disk to make more contributions to everyone, so the netizen carried out a disassembly, and on-line launched all the details without a dead angle "live" , to get a better idea of what drives are made of.

      First remove the cover Seagate Seagate 320G mechanical hard disk, display single disk 320GB, double head; Then remove the top cover magnet (two magnets and head) to see the voice coil motor coil, bearings, control chip, head support structure and steel strip wiring, wiring details. 

     This netizen's this action also confirmed the existence of voice coil motor in hard disk to everybody. The hard disk is composed of disk body (magnetic surface, magnetic track, cylinder and sector) , read-write head assembly (read-write head, drive arm, drive shaft) , magnetic head drive mechanism (voice coil motor, magnetic head drive car and anti-vibration mechanism) , main shaft assembly (bearing and motor) . 

     The hard disk drive head is integrated with the head arm and the servo positioning system. The servo positioning system consists of a coil behind the head arm and an electromagnetic control system fixed on the base plate. Due to the limitation of the positioning system, the head arm can only move between the inner and outer tracks of the disc. The motors in the hard disk drive are voice coil motors, which can work continuously for a long time with little mechanical wear under the support of high-speed bearings.

      Voice Coil Motor is a kind of direct drive motor, which usually adopts the Mechanical Structure Without Iron Core, which brings many advantages to motion control. Because there is no iron core, when the armature current direction changes, the voice coil motor output thrust is proportional to the armature current, high linearity. Therefore, the thrust can be stable and smooth, suitable for force control mode. Because of the advantages of voice coil motor, it is widely used in hard disk. 

     Kunshan has extensive experience in the development and manufacture of Voice Coil Motors, the Voice Coil Motors sold include cylindrical voice coil motor, rectangular voice coil motor, flat voice coil motor, swing voice coil motor and shaft voice coil motor, tongmao voice coil motor plays an important role in semiconductor, micro machine tools, aerospace and other fields. 

     The article was originally written by www.tmmotion.com of Tongmao Electronics Co. , Ltd. in Kunshan.