Magnetics Business & Technology - May/June 2021 - 45

ADVERTISING INDEX
Index of Advertisers

Perseverance Lands on Mars with maxon
Precision Motors Aboard

Index of Advertisers

Continued from page 46...
Audemars Microtec (R. Audemars SA)
Bunting

16-17, 34
www.audemars.com

25, 34
www.magnetapplications.com

Dura Magnetics

31, 35
www.duramag.com

Elytone Electronic Co., Ltd

15, 35
www.elytone.com.tw/magnetics

General Atomics

42
www.ga.com/magnet-technologies.com

GMW Associates

5, 36
www.gmw.com

ITG Electronics

7, 33, 36
www.itg-electronics.com

Laboratorio Elettrofisico USA, Inc.
29, 37
www.laboratorio.elettrofisico.com
Lake Shore Cryotronics, Inc.
Magnet-Physics, Inc.
Magnetic Instrumentation
Magnetic Metals
Max Baermann GmbH
MEDA, Inc.
Metrolab Technology
New England Wire Technologies
Space Tech Expo
TE Connectivity

11, 37
www.lakeshore.com
9, 38
www.magnet-physics.com
23, 38
www.maginst.com
27, 39
www.magneticmetals.com
39
www.max-baermann.de
12-13, 21, 40
www.meda.com
19, 40
www.metrolab.com
41, 48
www.newenglandwire.com
47
www.spacetechexpo.com
2, 41
www.te.com

Vibration and shock - The first challenge is to survive the rocket launch.
This means that the motor must be resistant to shock and vibration. The
vibration is not as strong as people might think: A little more than on a passenger plane, but not much more, and only for a few minutes. Shocks, on
the other hand, are something that we need to deal with on a regular basis
when working with standard products. These occur mainly during staging,
which is when the first stage separates from the rest of the rocket. The
resulting forces would destroy normal motors because the rotor would
become separated from the stator. That's why we need to reinforce our
drives, for example by encapsulating the rotor and using special welds,
special retaining rings, and optimized materials.
Vacuum and radiation - The trip to Mars takes about six months. During
this time, the drives need to survive the vacuum and radiation. The most
damaging radiation doesn't come from the Sun, but from high-energy particles from outside the solar system, which can damage the electronics.
That's why we need specially hardened electronics for the Hall sensors
on the motors. To be extra safe, we're installing them in pairs for redundancy. In a vacuum, the durability of components is important. You can't
use a glue that undergoes changes in its chemical properties and loses its
adhesiveness after a few days in a vacuum.

Weight reduction - Rockets can carry only a limited mass to other plan-

ets. To be as light as possible, we also resort to unusual shapes and
use thinner housings, or titanium instead of steel. We also often use the
smallest possible drive sizes, because we know that the operating time
required is usually shorter than for industrial applications. Higher wear is
therefore acceptable.

Atmosphere of Mars - After arriving, the motor must work flawlessly for
To Advertise in Magnetics Business & Technology
Contact Scott Webster at 917-445-6122 or email
ScottW@WebcomCommunications.com

the entire duration of the mission: Due to the thin atmosphere, the lubricants need to be resistant to outgassing and need to retain their properties. Especially for brushed DC motors, it is also necessary to use the
right brush mixture. No patina forms on Mars, which is why we developed
special brushes impregnated with a lubricant (silver graphite with 15%
MoS2). That's one of the most important modifications, because regular
brushed motors fail after only a few hours in a vacuum.
For more info, see www.maxongroup.com.

www.MagneticsMag.com

May/June 2021 * Magnetics Business & Technology

http://www.audemars.com http://www.magnetapplications.com http://www.duramag.com http://www.elytone.com.tw/magnetics http://www.ga.com/magnet-technologies.com http://www.gmw.com http://www.itg-electronics.com http://www.laboratorio.elettrofisico.com http://www.lakeshore.com http://www.magnet-physics.com http://www.maginst.com http://www.magneticmetals.com http://www.max-baermann.de http://www.meda.com http://www.metrolab.com http://www.newenglandwire.com http://www.spacetechexpo.com http://www.te.com http://www.maxongroup.com http://www.MagneticsMag.com

Magnetics Business & Technology - May/June 2021

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