Magnetics Business & Technology - March/April 2020 - 10

&dhZZd/>
copper wiring. This means that machinery designed to automate
the twisting of the copper wires can be eliminated from the motor
manufacturing process and replaced by fabless, fully automated
PCB manufacturing. This major shift in the process drastically
VLPSOL¿HVPRWRUPDQXIDFWXULQJDQGVLJQL¿FDQWO\UHGXFHVWKHFRVW
WRPDNHHDFKPRWRUQRWHV,Q¿QLWXP
:LUHZLQGLQJVDQGLURQODPLQDWLRQVDUHHOLPLQDWHGE\HWFKLQJ
FRSSHUFRQGXFWRUVLQWRDSULQWHGFLUFXLWERDUG:HLJKWUHGXFWLRQ
on the component level is as high as 90% and the machine level
FDQEHXSWROLJKWHUZHLJKW2SWLPL]HGPDJQHWLFFRQ¿JXUDtions improve power density even further.
The core-less motor provides high performance at high speeds
by eliminating hysteresis loss found in a conventional stator core.
5HPRYDORIWKHFRQYHQWLRQDOODPLQDWHGVWDWRUFRUHVLJQL¿FDQWO\
reduces core losses, decreases cogging and torque ripple and
LQFUHDVHVHI¿FLHQF\,GHQWLFDOFRSSHUFRQGXFWRUVDOORZHOHFWULFDO
losses to be easily controlled and provides high power density by
optimizing copper layout.
:LWKWKHLURQUHPRYHGDQGDWWUDFWLYHPDJQHWLFIRUFHVHOLPLQDWHG
from the machine, structural requirements are also reduced
VLJQL¿FDQWO\)XUWKHUWKHFRQWLQXRXVFRLOGHVLJQLQWKH3&%VWDWRU
RSWLPL]HVFRLOJHRPHWU\SURYLGLQJPD[LPXPSRZHUGHQVLW\DQG
HI¿FLHQF\DWDIUDFWLRQRIWKHVL]HDQGZHLJKW&XUUHQWGHQVLW\
can be more than four times higher than machines with traditional iron laminations and copper windings, says the company,
substantially reducing the copper mass for the same current
rating. The company's design algorithm allows it to design and
produce stators with virtually any dimension, so motor diameter
and length can be increased or decreased as desired.

$QRWKHUDWWULEXWHZKLFK,Q¿QLWXPFLWHVLVWKDWDFRXVWLFQRLVH
is low due to the absence of normal magnetic forces acting
between the rotor and the stator and negligible torque ripple
due to the absence of reluctance torque. The normal magnetic
IRUFHLQDQD[LDOÀX[HOHFWULFPDFKLQHLVSHUSHQGLFXODUWRWKHURWRUVXUIDFHDQDORJRXVWRDUDGLDOPDJQHWLFIRUFHLQDUDGLDOÀX[
machine. Iron core electric machines typically have some torque
pulsations due to the variations in the reluctance as the rotating
PDJQHWLF¿HOGWUDYHOVDURXQGWKHPRWRU,QWKHDLUJDSRIDQLURQ
core machine, the position of the rotor relative to stator is such
WKDWWKHPDJQHWLFÀX[SURGXFHVDPDJQHWLFIRUFHLQWKHVDPH
direction of rotation of the machine. The magnetic force acts in
such a way as to reduce the reluctance of the magnetic path. As
the rotor moves in the direction of rotation, the alignment of the
rotor poles changes relative to the stator to a point where the
PDJQHWLFÀX[SURGXFHVDIRUFHLQWKHRSSRVLWHGLUHFWLRQRIURWDtion. This alternating magnetic force will produce a torque ripple.
7KH,Q¿QLWXPPRWRUKRZHYHUGRHVQRWKDYHDQLURQFRUHRU
VORWVVRWKHGLVWULEXWLRQRIWKHPDJQHWLFÀX[DFURVVWKHDLUJDSV
and stator remains constant and the machine rotates without any
pulsating magnetic force acting on the rotor.
The Company
%DVHGLQ5RXQG5RFN7;QHDU$XVWLQ,Q¿QLWXPZDVHVWDEOLVKHG
in 2016. Fresh funding to fuel its growth came in December in
WKHIRUPRIDPLOOLRQ6HULHV%URXQGRI¿QDQFLQJ7KLV
IROORZHGD6HULHV$URXQGFRPSOHWHGLQ-DQXDU\EULQJLQJWRWDO
funding to $15.2 million. The Series B round was led by Cottonwood Technology Fund and includes participation from Chevron
7HFKQRORJ\9HQWXUHV$-$;6WUDWHJLHVDQGLQGLYLGXDOLQYHVWRUV
"Our patented circuit board stator is what sets us apart and
positions us well for success, not just in the HVAC space, but

From Earth

The Standard in Magnetic Measurements

μMAG-01 Handheld
Magnetometer

*
*
*
*
*
*
*

Single Axis
200,20 and 2μT Ranges
1 nT Resolution on 2μT Range
+/-0.5% Accuracy
3 1/2 dig LCD Display
Ambient Field Cancellation
Analog Output

MEDA.COM
10

RM100 Nanotesla Meter

FVM400 Vector Magnetometer

*
*
*
*
*
*

*
*
*
*
*

±200,000 nT Range
±0.01% Accuracy
0.1 nT Resolution
RS232 & Ethernet Connectivity
Ambient Field Cancellation
LabView Driver

SALES@MEDA.COM

Magnetics Business & Technology * March/April 2020

703.996.8990

3-Axis
±100,000 nT Range
±0.25% Accuracy
1 nT Resolution
RS232 Interface

FAX: 703.996.8770
www.MagneticsMag.com
http://www.MEDA.COM http://www.MagneticsMag.com
Magnetics Business & Technology - March/April 2020

Table of Contents for the Digital Edition of Magnetics Business & Technology - March/April 2020
