Magnet Assemblies

Electron Energy offers magnet assemblies for a wide variety of applications, including traveling wave tubes, motors & generators, and inertial devices.

Magnet Assemblies for Traveling Wave Tubes

Traveling wave tubes, klystrons, and magnetrons are all used to amplify signals at microwave frequencies for high-performing radar, communications and electronic countermeasure systems.

When samarium cobalt magnets were developed in the late 1960s, Electron Energy obtained a royalty-free non-exclusive government license to produce these magnet materials. EEC has provided a significant advantage to TWT customers by continuously improving magnetic field strength and thermal properties.

EEC is the world leader for design and manufacture of magnetic assemblies for traveling wave tubes (TWTs). We are recognized for our superior magnetic materials, strong applications knowledge, and our ability to meet the very demanding requirements of our customers.

We offer in-house design capability for engineering stacks to a specific profile and can run full profile testing of a completed stack. Our materials are custom blended, and magnets can be designed with temperature-stable magnetic fields up to 550°C and reversible temperature coefficients to 0.001 % change in Br per °C.

Magnet Assemblies for Motors & Generators

Low weight, ultra-high temperature tolerance and excellent reliability make EEC magnets ideal for motors, actuators, and generators used in military, commercial, and aerospace applications.

Electron Energy has extensive experience in designing and prototyping both axial flux and radial flux rotating machinery. Furthermore, our technology enables us to improve magnetic performance by a unique Halbach and interior magnet design, which has improved benefits in terms of power density, compact size, weight, and cooling, compared to conventional machines. This allows the overall size and weight of the motor to be reduced.

Our SmCo-UHT TM EEC 16 T550 magnets have been used to design a high temperature motor (power 10kW, maximum speed 25krpm) for NASA space power system applications (SBIR Phase II project). HT-550 magnets are ideal for motors that require survivability in extreme high temperature (over 480°C) and high pressure (over 100 atmospheres).

motors generators chart

Demagnetization curves of SmCo magnets for ultra-high temperature application
As can be seen from this figure, the extrinsic demagnetization curve is a straight line up to 550°C, which is important for dynamic ultra-high temperature applications. This means that the magnetic flux density is reversible up to 550°C. EEC is identifying opportunities for prototype and beta testing of permanent magnet applications with ultra-high temperature and high-speed conditions.

Magnet Assemblies for Inertial Devices

Electron Energy also designs and manufactures magnetic assemblies for inertial guidance systems used in aircraft, marine vessels, spacecraft navigation and control systems. Inertial guidance systems typically use magnetic assemblies in:


Instruments that measure acceleration, detect and measure vibrations, or measure acceleration due to gravity or inclination.


Devices that measure or maintain orientation.

Temperature compensated SmCo magnets provide precision control and stability for accelerometers and gyroscopes. Temperature coefficients of residual induction for magnets used in the applications can be controlled to better than 0.001% change in Br per degree C or 10 parts per million.