Hdd voice coil driver

 · Voice coil actuators are a type of direct drive mechanism that provides extremely precise positioning over small displacements. Like linear motors, they work on the principle of a permanent magnet field and a coil winding. When a current is applied to the coil, a force is www.doorway.ruted Reading Time: 3 mins. The other most common use of voice coils is in the read-write arms of spinning hard drives (HDDs). The voice coils in a hard drive’s read-write arm bring it down to be in contact with the spinning disc at the precise moment to read or change a bit of data. With billions of Estimated Reading Time: 2 mins. rotating the actuator of the voice coil motor (VCM), we can position the read/write head onto the desired tracks. Fig. 1 Schematic of a typical modern hard disk drive. According to the features of accessing data on disk, HDD servo systems mainly involve three kinds of control tasks [3]: track-seeking control, track-following control, and setting.

I first tested the voice coil with an ohmmeter, then connected it up to an audio amplifier, with a resistor in series in case I accidently shorted the output. In today's era, stepper motors are no longer used as HDD actuators. They are replaced by so called - servomechanism. Head arm movement is secured and controlled by changing amplitude and polarity of current through the voice coil in the field of permanent magnet. Voice coil is integral part of head assembly and it is located on its backside. Thus, its movement in the field between two permanent magnets brings entire head assembly into motion. rotating the actuator of the voice coil motor (VCM), we can position the read/write head onto the desired tracks. Fig. 1 Schematic of a typical modern hard disk drive. According to the features of accessing data on disk, HDD servo systems mainly involve three kinds of control tasks [3]: track-seeking control, track-following control, and setting.

The other most common use of voice coils is in the read-write arms of spinning hard drives (HDDs). The voice coils in a hard drive's read-write arm bring it. The voice coil driver L is a linear power am- plifier designed to drive single phase bipolar DC motors for hard disk drive applications. The de-. Since the early s, all hard drives used a voice coil actuator, rather than a stepper motor, to position the read- write head over the surface of a disc.