SETEMBER 2005 CONTENTS - Mavilor

SETEMBER 2005
Following, there comes an
article of a type of motor, the
washdown. This article has
been published on the website:
http://www.touchbriefings.com.
INFRANOR SWITZERLAND
shows us an application for
the defense industry.
Thank you, the Mavilor team.
INTRODUCTION
On this occasion, in the Mavilor
Express we will find the last article
entitled "Types of Motor", written by
Prof.Dr.JC Compter, as you know a
member of Eindhoven University. This
article is a simple explanation of
different types of motors.
CONTENTS
1 Introduction
2 Types of motors by Prof. D. JC Compter
3 Mavilor Team, Medical Device.
4 Servomotor Application Infranor CH
5 Mavilor World Distributors
MAVILOR MOTORS, S.A.
Polígono Industrial URVASA,
E- 08130 Santa Perpètua de Mogoda (Barcelona) Spain
Tel. +34 93 574 36 90 - Fax: +34 93 574 35 70
website: www.mavilor.es - e-mail: mavilor@mavilor.es

TYPES OF MOTOR
by DR. J.C.COMPTER
Given the current state of the art, the regulation or control of systems using
electric motors is almost taken for granted. Certainly where high standards
are expected of stability, reaction speed or accuracy, for example, electric
drives are an obvious solution.
Other drives such as hydraulic
cylinders are also used in
practice. In terms of power
density these cylinders are far
superior to electric system; but
if high standards are going to be
expected of dynamic behaviour,
once again linear electric drive
come to the fore.
Hundreds of different types of
electric motors have been
developed over the past hundred
years; only some of them are
suitable for servo systems.
Broadly speaking there are
threee main types, as shown in
Fig. 1.1:
1) the stepping motor
2) alternating current (AC)
motors
3) direct current (DC) motors
ONLY in the case of DC motors
can an outgoing quantity (the
torque delivered) be regulated
linearly, both statically and
dynamically, by way of an imput
quantity ( the current). Linear
DIRECT CURRENT
behaviour of the motor is almost
a requirement where the design
of regulated system is
concerned. For this reason much
of the focus of chapters below
will be on the capabilities and
limitations of the DC motor.
For a number of applications the
stepping motor is a cheaper
solution than a DC motor,
because it has no need of
position sensors to function in
a control. Apart from the lower
costs, the main
ELECTRIC MOTORS
ALTERNMATING CURRENT STEPPING MOTORS
Ext. Field universal PM
serial asynchronous Hybrid
shunt synchronous Var.reluct.
compound
PM
reluctance
Hysteresis
etc.
permanent magnet
conmutator Brushless Linear motors
iron armature
Disc armature
Hollow rotor
Fig. 1.1 Overview of motors
Sine EMF
Square wave EMF
weaknesses/strenghts of the
stepping motor are:
- considerable dissipation
- poor damped vibrations
following a step
- discrete steps
- limited acceleration
- areas in which the motor does
not function well in terms of
rotational speed
+little specific control
engineering knowledge
required
+ no position sensor required
+ long life
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Mavilor Express - Núm. 29 - Setember 2005
It is therefore prudent when
selecting a drive motor to start
by analysing whether a stepping
motor can meet the
specification that have been laid
down. Remember that if a
position sensor is after all
regarded as a requirement in
the application, the cost price
difference is negligible.
DC Mavilor Servomotors
AC motors can also be used as
servomotors; the control of the
motor itself is generally
complex, because the
frequency, the phase and the
amplitude of current or voltage
must all be regulated. The lower
limit of commercially available
systems is which a (n)
(a)synchronous motor forms the
core is now approximately 1
kWatt. as it is only in benefits
of the (digitally) controlled
(a)synchronous motors
(robustness, speed range)
justify the high cost, we shall
not be considering this type of
motor any further here. We
shall, however be looking at the
synchronous AC motor as a
form of construction of the
brushless motor.
AC Mavilor Servomotors
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3

Medical Device
a report by M a v i l o r M o t o r s , S . A .
If there is a sector in which stringent
professional standards, perfection
in execution, risk-minimisation and
hygiene dominate, it is in the
medical sector.
The medical sector depends on the
skill and knowledge of excellent
medical professionals, and those
professionals depend on the quality
of their equipment. In the last few
years, the evolution of this
equipment has been extraordinary
and the incorporation of new
technologies has produced levels
of precision difficult to imagine even
10 years ago.
In order to provide these new
medical tools, engineers and other
professional technicians are
working within their companies to
bring their initiative, skills and
ingenuity to the creation of products
to meet the constantly evolving
needs of the medical sector. These
products must be designed
specifically to meet the particular
needs of this sector, which include
strict hygiene standards, high
speed, precision and reliability.
T h e S e r v o m o t o r i n
M e d i c a l T e c h n o l o g y.
One of the essential components
of medical technology is the electric
servomotor. Motion control is the
driving force behind many medical
applications, including centrifuges,
magnetic resonance imaging (MRI),
dialysis machines, scanners,
exploratory devices and all types
of robots.
Motion control technology delivers
the highprecision and high-speed
movement and position control
required by these medical
applications. M a v i l o r S e r
v o m o t o r s Mavilor Motors,
S.A., an Infranor Inter AG Swiss
Group company, has been
operating in the automation
technology field since 1973.
Infranor corporate headquarters
are located in Zurich and
the group comprises 20
companies, some involved in
application and sales and others
in the manufacture of
components for automation.
Mavilor forms the branch
specialising in the manufacture
and sale of servomotors. At the
core of the company objectives
is a commitment to creating
positive partnerships with their
clients. Their 30 years of
accumulated experience
incorporating all stages of
design, production and
implantation make them much
more than just excellent motor
manufacturers, allowing them
to act as technological partners
with the capacity to provide the
optimum solution for any
automation need. Their highly
specialised and competent
team is ready to respond to the
constant innovation challenges
and changing needs that
characterise the medical sector.
Throughout their history,
Mavilor Motors has introduced
innovative products to the
motion control industry. Their
investment in research and
development (R&D) and
technical experience allow them
to lead the market in offering
new state-of-the art products
every year. Modern and
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Mavilor Express - Núm. 29 - Setember 2005
seamlessly integrated production
systems allow Mavilor to offer
extremely short lead times. The
expert engineering team and
quality team work together to
constantly improve both the
product and the production
system in order to offer a
competitively priced, innovative
and durable product to the
medical industry.
Mavilor products include a wide
range of direct current (DC)
continuous current and
alternating current (AC) and DC
alternate current electric
servomotors. These products are
unique in their adaptability,
offering both flat and elongated
geometry for the maximum
flexibility to meet the diverse
needs of the market.
These electric servomotors are
characterised by an excellent
capacity for acceleration, due to
a design that permits high torque
with low inertia. In addition, these
servomotors offer highly desirable
weight and volume ratios with low
weight and compact size they are
capable of delivering high
torque and reaching high speeds.
Mavilor sells its products around
the world through a series of
professional distributors who
attend to the needs of their
clients. In this way Mavilor and
its distributors have maintained
a worldwide clientele, offering
technical support and post-sales
service when necessary for the
applications and equipment that
incorporate Mavilor servomotors
in each market. Currently, Mavilor
Motors operates worldwide
through distributors in more than
35 countries in order to guarantee
that each client has immediate
access to local support.
The Mavilor strategy is based on
exceptional professionalism and a
constant striving to satisfy their
clients and provide the optimum
solution for the most demanding
of applications. This philosophy has
allowed them to maintain client
partnerships for over years.
M a v i l o r W a s h d o w n S e r i e
s f o r t h e M e d i c a l S e c t o r
The Washdown series has been
developed to meet the exacting
needs of the medical sector
outlined by the following elements.
H i g h S p e e d a n d P r e c i s i o n
Powerful acceleration and high
speed are achieved using Mavilorpatented
technology, a slotless
design that eliminates induced
currents and the magnet
temperature elevation that results.
This unique noncogging motor has
been developed to deliver sensitive
and precise position control
without vibrations or modulations,
due to its singular magnet
distribution.
The need for precise speed control
and sensitive positioning control
in medical sector applications is
paramount. These applications
demand perfection in positioning
and an absolute control of speed,
combined with extreme reliability,
since any error could result in
serious consequences. That is why
instruments such as scanners,
centrifuges and other radiological
and surgical equipment find their
ideal partner in Mavilor motion
control systems.
High speed is necessary in many
hospital applications, for example
centrifuges that require high
speeds of between 20,000 and
30,000rpm without vibrations,
with the added demand of
sudden and complete stops. High
speed is also a crucial element
in odontology equipment and
many other hospital instrument
applications.
R e l i a b i l i t y
Each Mavilor product is the result
of an allencompassing quality
control system: Mavilor Total
Quality. This meticulous quality
control produces extremely
reliable motors capable of
delivering the consistent and
unfailing performance that is
necessary in a busy medical care
application.
Hygiene
These motors were developed to
withstand the rigorous cleaning
necessary for sterilisation. In
addition, the motor is a
completely closed unit, including
flanges and exterior cables,
which provides a superior level
of IP67 protection.
The specially designed rounded
shape (no corners) prevents the
accumulation of any deposits.
These design features allow for
an exceptional standard of
cleanliness and hygiene.

S i l e n t
O p e r a t i o n
Through its
Mavilor-patented
design, this
motor series has
an extremely low
level of audible
noise, making it
ideal for medical
c a r e
environments
where noise
contamination is
not acceptable.
Complete Motion
Control Systems
An extensive
range of
encoders and
resolvers
transmit
position and
s p e e d
information and
the precise
electronic
c o n t r o l
necessary for
seamless
operation.
The electronics stand out for
their compact size and ease
of use. The auto-tuning and
auto-phasing features make
system installation simple and
allow the client to fine-tune
the system for the best
performance. In addition,
various types of customised
work cycles can be easily
programmed.
With this comprehensive
product series, ranging from
amplifiers to cables and
connectors,
Mavilor offers
complete motion
control systems for
the medical sector.
P a r t n e r s i n
O p t i m i s a t i o n
Mavilor offers
superior support
from its technical
team of engineers
and project
managers who
work with each
client to provide
the optimum
solution for each
application.
The Mavilor
technical support
team, driven by
innovative and
experienced
professionals in
the medical
electronics field, is
capable of
anticipating the
needs of each
application and
guiding the client
towards the optimum motion
control solution.
They also create customised
motors designed specifically
to meet the needs of the
client.
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Mavilor Express - Núm. 29 - Setember 2005
INFRANOR
SWITZERLAND
APPLICATION
CLIENT:
CONTRAVES
Skyshild has been
developed by Infranor
Switzerland and the Mavilor
technical engineering team.
Using the SE-908 Mavilor
Motor, the technical
aspects for the defense
industry are the quality
issues: the maximum
resistance to temperature
-40ºC+60ºC, vibrations,
shock-15G, etc.
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