Monthly Archives: March 2018
In devices with a moving coil there are no pre-fixed positions. Instead, they use a special guidance system (positioning), which accurately brings the heads to the desired track.
The system of precise guidance of the heads on the tracks is called a servo drive, and for its operation a feedback signal is required that carries information about the real relative position of the tracks and heads.
Temperature fluctuations do not affect the accuracy of the drive. When compressing and expanding disks (rotation, temperature), all changes in their sizes are monitored by a servo drive and the positions of the heads are adjusted. Continue reading
Unlike HDDs, the Zip drive uses a linear drive with a moving coil. There are two types of drive mechanisms for moving coil heads: linear and rotary. These types differ only in the physical arrangement of magnets and coils.
The drive with a moving coil is an electromagnet. Its design resembles that of a conventional loudspeaker. When a current of a certain polarity flows, the coil moves in or out of the gap of the permanent magnet. Continue reading