A Voice Coil Motor Assembly (VCMA) is a set of strong rare earth magnets bonded to steel plates. The magnetic field provided by the VCMA interacts with the actuator arm’s wire coil to generate the high frequency movements for the magnetic heads to read and write data accurately over the rotating disk.

MMI’s advantage in VCMA is in electromagnetic systems design and testing capabilities, many of which unique and patented.  Some VCMA designs can be rather complex with pins, spacers, rubber stoppers and actuator letches built into the VCMA.  For these more integrated designs, tooling must be highly customized and advanced to achieve a high degree of automation.  The internal manufacture of the plates holding the magnets is an added cost advantage.  Finally, all MMI VCMAs are assembled in the industry’s most advanced automated production lines that are designed by our own factory automation equipment unit to deliver the highest quality products.