Magnetics Business & Technology - May/June 2019 - 13

FEATURE ARTICLE
A prototype 11 kw radial-gap motor was produced using various
motor materials belonging to the Hitachi Metals Group including not only Metglas for the teeth but also its Hidense ultra-high
density isotropic bonded-magnets and enamelled wires.
Evaluation of the prototype confirmed a motor efficiency of
97.2%-high enough to meet IE5 standards, the highest level in
the guidelines for motor energy efficiency of the International
Electrotechnical Commission, said the company. The prototype
is an 11 kw radial gap motor, the most common type motor distributed in the market, allowing the use of the stator coil structure
which can be produced using existing manufacturing technology.

A major problem with amorphous metal, however, has been to
manufacture it economically due to the difficulty in cutting and
machining the material which is harder than sheet steel. Hitachi's
Metglas unit, uaing a proprietary high-speed casting process and
other techniques, has pioneered the development of numerous
applications using the material, particularly for transformers.
Metglas provides this description of its material. Unlike the
crystalline structure of other magnetic materials, all the atoms
in an amorphous metal are randomly arranged, thus giving it a
higher resistivity (about three times) value than that for crystalline counterparts. Amorphous alloys are prepared by cooling the
melt at about million degrees per second. This fast cooling does
not give the atoms enough time to rearrange into stable crystalline form. As a result, one gets metastable amorphous structure.
Because of the absence of crystalline structure amorphous alloys
are magnetically soft (lower coercivity, lower core loss, higher
permeability). High resistivity gives lower loss at higher frequencies. The losses are among the lowest of any known magnetic
materials.
For more information, see www.hitachi-metals.com, and www.
metglas.com.

The benefit of amorphous materials for use in electric motors has
been known for years, however, researchers have struggled with
developing a solution that could be suitable for mass production.
Amorphous metal has a disordered atomic structure in contrast
to the crystalline structure of conventional metals, providing high
tensile strength and extremely low magnetic losses.

To Space

The Standard in Magnetic Measurements

Hemholtz Coil Systems

* Turnkey * 1, 2, 3, and 4 meter
* 3-axis * Applications include:
Calibration - Research - Development for
Magnetometers - Magnetic Sensors Directional Drilling Tools Drone Attitude Control Systems
+ Satellite magnetic cleanliness testing
+ Animal behavior research

MEDA.COM
www.MagneticsMag.com

Satellite Magnetometers
*
*
*
*
*

3-Axis
Satellite Attitude Control
Space Qualified
Hi Rel
Radiation Hardened

SALES@MEDA.COM

703.996.8990

FAX: 703.996.8770

May/June 2019 * Magnetics Business & Technology

http://www.metglas.com http://www.MEDA.COM http://www.MagneticsMag.com

Magnetics Business & Technology - May/June 2019

Table of Contents for the Digital Edition of Magnetics Business & Technology - May/June 2019