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February 2017:

ALXION TECHNOLOGICAL DEVELOPMENTS FOR EXTENDING THE APPLICATIONS OF PERMANENT MAGNET TORQUE MOTORS AND ALTERNATORS

The extension of torque motors and permanent magnet generators applications in outdoor environments on the one hand and with relatively high speeds on the other hand, whereas traditional direct drive applications are at slow speed, led ALXION to various technological developments.


As a matter of fact, the standard rotors of ST complete torque motors and STK frameless torque motor kits have a highly reliable and cost-effective cylindrical glue-bonded magnets structure in efficiently sealed applications of lower speed and especially in workshops with a standard temperature and humidity environment.


For higher speed applications that are susceptible to vibration due to the lack of balancing or incomplete balancing of rotary equipment and for applications in the presence of moisture, ALXION designed and experimented a rotor encapsulation structure encasing the glue bonded magnets with multi-layer peripheral bandage under tensile strength which has proved its reliability on a very large number of cases.


It will be noted that the same technology of rotor encapsulation and peripheral bandage makes it possible to address also the applications of underwater propulsion with motor internal parts immersed in dielectric oil under equipressure .


More recently, ALXION encountered new applications of permanent magnet torque motors where the presence of glue and polymers was to be avoided mainly in the rotor. These are in particular applications of rotors in vacuum exposed to ionizing radiations and, on the other hand, applications in printing machines where the presence of aggressive solvents such as toluene, penetrating in spite of the sealings in the users’ mechanics can damage the bonding glues.


For these applications, a rotor without glue and polymers is either needed or recommended, in particular a clamping of the magnets to the rotor provided by mechanical parts without glue. In addition, interchangeability with standard rotors must be maintained to facilitate application maintenance.


ALXION has therefore worked on the design of an adhesive-free rotor made of mechanical parts and interchangeable with standard rotors and has designed and tested a rotor structure that ensures vacuum and ionizing radiation applications and reliable magnets bonding for applications in an aggressive environment.


Thus, ALXION currently has 3 rotors structures that are reliable for different applications and environments:

The standard torque motor or alternator rotor with glue-bonded magnets, suitable for slow speeds in direct drive in dry workshop environment and for well-sealed and non-condensing external applications.

The torque motor or alternator rotor with glue-bonded and encapsulated magnets with peripheral bandage under tensile strength enabling higher speed and / or vibratory applications and / or in the presence of moisture to be addressed. Moreover, this rotor is suitable for applications of motor internal parts immersed in oil under equipressure as in the applications of propulsion of underwater vehicles in deep depth. This rotor is more resistant to external aggressions than the standard rotor but is not immersible in water. Moreover, this rotor is mechanically interchangeable with standard rotors with a slightly higher weight and inertia.

The torque motor rotor without glue and polymers with magnets integrated in mechanical parts. It is intended for applications of rotors in vacuum and ionizing radiations and motors integrated in machines linked to processes with the possibility of infiltration of solvents aggressive for glues despite the sealing.This rotor is interchangeable with the standard rotor and has a slightly higher weight and inertia than the standard one.


Thanks to its policy of constant technological innovation over the past 30 years, subject to rigorous experimentation and systematic industrialization, ALXION has in 2017 a wide range of torque motors and permanent magnet generators for direct or semi- direct drive (with little reduction or multiplication) to address not only the applications of workshops but also a large number of external applications.


At the end of 2016, ALXION has a population installed on the order of 15,000 motors FC, ST, STK in the world including 1500 alternators for wind turbines and hydro power.


ST and STK torque motors, high power 136OEP motors as well as RESFC resolvers are manufactured in factory ISO 9001 (EN9100) certified.


ALXION sells 55 to 65% of its production according to the years outside France and notably in Europe, China, Canada, and the United States.


ALXION currently produces around 150 motors and alternators per month.


ALXION torque motors are controlled worldwide by most electronic drives available on the market and an application note is available on wwww.alxion.com on this subject.

Among the renowned companies who use ALXION motorss and alternators are:

ACUITAS
ANDRITZ
ARC INTERNATIONAL (ARCOPAL, LUMINARC)
ASELSAN
ATN
AUTOMATEX NON WOVEN
AVITRONICS
CERN (Centre Européen pour la Recherche Nucléaire)
COMAU
CUIR
DCM
ELEMENTAL ENERGY TECHNOLOGIES
EOLTEC
EOLYS RE
FINNWIND
FIVES
FOREST LINE
FUTURENERGY
GALILEO AVIONICA
HURON GRAFFENSTADEN
MICHELIN
MORI SEIKI DIXI MACHINES
NEGRI BOSSI
NHEOLIS
OCEAN POWER TECHNOLOGIES
OKWIND
OTIS
SEABENERGY
SMP TECHNIK
SONY DADC
STAGE TECHNOLOGIES
STARLINGER
STAUBLI
WIND IT
WIND SAIL RECEPTOR

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