Bob Johnson Associates - Wind Power Magnets

Wind Power

BJA Magnetics is excited to introduce:

Direct Drive Permanent Magnet Generator (DD PMG) technology is used in small and medium size wind turbines from 25 kW to several megawatts. DD PMG’s used in wind turbines offer the advantages of reduced size, weight and manufacturing costs of the generator without compromising efficiency. Reducing the size and mass of the generator can in turn, reduce the size

Our “W” Grade optimizes the various magnetic properties to minimize cogging, Ripple Torque, and total breakaway Torque. Total magnet performance loss is less than 0.5% when the magnets are cycled to 90°C. In addition, our “W” Grade NdFeB magnets are designed to run at temperatures as high as 130°C, and in critical situations of an emergency shutdown, or a short circuit at the machine terminals, their enhanced magnetic properties increase flux density survivability.

BJA Magnetics offers “W” grade NdFeB magnets with energy products up to 48 MGOe and maximum operating temperatures of 150°C. Rectangular parts may be manufactured up to 150 mm long x 101 mm wide x 38 mm thick, with tolerances as tight as ±0.13 mm. Laminated and non-laminated flux concentrators are available as a complete assembly. Other “W” grades offering higher operating temperatures, are available in slightly smaller overall sizes. In addition, various geometries are available including arc and breadloaf shapes.

BJA MAGNETICS WINDPOWER NdFeB GRADES
MATERIAL GRADE	Br (kG)	Hc (kOe)	Hci (kOe)	BHmax (MGOe)	Working Temp °C
N42H-W	13.0 – 13.3	Enhanced normal coercivity, Contact us for details.	≥17.0	40.0 – 42.0	≤120
N45H-W	13.3 – 13.7			43.0 – 45.0
N48H-W	13.6 – 14.2			45.0 – 48.0
N42SH-W	13.0 – 13.3		≥20	40.0 – 42.0	≤150
N45SH-W	13.3 – 13.7		≥20	43.0 – 45.0	≤150

We are committed to alternative energy production; to that end we have developed a line of permanent magnets exclusively for direct drive wind power turbine generators.

“W” GRADE NdFeB DIRECT DRIVE WIND POWER GENERATOR MAGNETS.

and weight of other wind turbine components -- hence their manufacturing cost. Over time, with fewer components, DD PMG wind turbines are also less likely to experience generator malfunction, gearbox failure, costly repair and lost productivity.

Please contact BJA Magnetics, and let us explain to you the advantages of our “W” grade NdFeB DIRECT DRIVE WIND POWER GENERATOR MAGNETS.