High Energy Rare Earth Permanent Magnets

Rare Earth Permanent Magnets (REPMs) possess high energy density and performance stability, due to which they have great potential in high technology areas like defence, space, atomic energy and medical diagnostics. DMRL has developed the technology for magnetic components of SmCo5 and Nd-Fe-B with high energy product (18-35 MGOe), thereby enabling device miniaturisation. The technology involves compaction of powder in magnetic field followed by sintering/annealing under vacuum/inert atmosphere. Several system laboratories of DRDO (DRDL, RCI, SSPL, MTRDC, NPOL, NSTL, CVRDE), ISRO (VSSC and LPSC) and DAE (BARC and IGCAR) have used magnets developed at DMRL for strategic applications. The technology offers great promise considering the abundant reserves of rare earth minerals in India.

Other areas of applications are beam control (travelling wave tubes, magnetrons), inertial navigation (gyroscopes, accelerometer, instrumentation), electro-mechanical devices (actuators, RF switches) and permanent magnet alternators, brushless motors, high speed rotors, etc.