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(Press Release) World's best performance while saving dysprosium; new grades of radially oriented anisotropic ring magnets, "NEOQUENCH-DR ", has been developed.

Jul 14, 2010Products&Technologies

(Press Release) World's best performance while saving dysprosium; new grades of radially oriented anisotropic ring magnets, "NEOQUENCH-DR ", has been developed.

Daido Steel Co., Ltd. (President: Tadashi Shimao) and Daido Electronics Co., Ltd. (President: Yoshio Inagaki) developed new grades of Nd-Fe-B anisotropic ring magnet, "ND-43SHR"and "ND-39SHR". These grades of magnets have the world's best performance while having a reduced dysprosium (Dy) content.
Utilizing the newly developed hot deformation process to highly orient nanometer-scale crystal grains, the world's highest level of magnetic performance and high heat resistance was achieved while reducing the use of rare and expensive Dy to approximately 1/2 the level of conventional sintered magnets.
The new grades are expected to be used mainly in the fast growing automotive EPS (electric power steering) market, as well as for other automotive/ industrial applications. Daido Electronics will start sample shipment in fall, 2010 and mass production is slated for 2011.

1. Background
Radially oriented, anisotropic Nd-Fe-B ring magnets (NEOQUENCH-DR) are widely used in various motors and actuators. Above all, the use in automotive EPS is increasing rapidly as it helps to improve fuel economy.
In addition, under the world wide pressure of greenhouse gas emission reduction, electrification of automobiles (including electric and hybrid electric vehicles, idling stop system, etc.) and more compact and lightweight vehicles are gaining momentum. This requires more compact yet powerful motors.
However, it was difficult to achieve high magnetic performance with high heat resistance. For instance, for a 140 degree Celsius heat resistant grade, the highest maximum energy product was limited to 35 MGOe. Higher performance ring magnets that can withstand higher temperature have been desired.

2. Maximum energy product, (BH)max, of the new grades
ND-43SHR: 43 MGOe (23% improvement from previous highest grade)
ND-39SHR: 39 MGOe (11% improvement from previous highest grade)

3. Applications
* Automotive motors ( Including EPS motors, oil pump motors etc.)
* Servo motors for industrial robots
* Office equipment and consumer electronics

4. Sales target of "NEOQUENCH-DR" (Daido Electronics group)
10 billion JPY in 2015 (4 billion JPY in 2009)

5. Notes
New products will be exhibited at "28th Motor Technology Exhibition" (Tokyo Big Sight)
held from July 21to July 23, 2010.

Radially oriented anisotropic ring magnet propety mapEnlarge

Radially oriented anisotropic ring magnet propety map

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