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1- How does MQM
detect faults?
2- How can all the
parameters of the motor be
determined from only
measurements of voltage, current
and speed?
3- Does MQM measure
noise and vibration levels?
4- Can I rely on
MQM to detect noisy motors?
5- The motors
behave differently when
installed on the appliance. Will MQM help me screen the motors
that are likely to behave
unacceptably when installed on
the appliance?
6- What is the
expected payback period for MQM?
7- Who needs to
learn how to use MQM and how
long does it take?
8- How long does it
take and how difficult it is to
create the initial model of the
motor?
9- Can I use the
experimental modeling
capabilities in the design
process?
How can I set the thresholds for
MQM?
How does MQM detect
faults?
The faults of an electric motor
affect the characteristic
behavior of the motor which in
turn affects the parameters
describing the motor. MQM
identifies these parameters and
detects the changes of the
parameters from their expected
value and associates them with
the faults. As an example, the
mechanical faults of the motor
due to bearing faults,
imbalance, etc.,distort the
symmetry in the airgap.the
effects of this eccentricity in
the airgap is amplified by the
current, which in turn cause
static and dynamic change in the
value of the inductance.
How can all the
parameters of the motor be
determined from only
measurements of voltage, current
and speed?
These measurements are taken
when the motor is supplied with
a rich signal which excites all
the modes of the motor. The
signal is specially designed for
the particular motor type and is
called a Pseudo Random Binary
Sequence (PRSB). Therefore these
measurements may be considered
to be infinitely many
measurements and they are in
sufficient length to identify
all the parameters.
Does MQM measure
noise and vibration levels?
No, MQM does not measure the
noise and vibration levels.
However, noise and vibration
causing faults affect and change
parameters of the motor. MQM
detects these changes and
therefore screens motors with
unacceptable noise and vibration
levels
Can I rely on MQM
to detect noisy motors?
MQM has reduced the washing
machine customer returns of
Arçelik due to noise by half.
The final judge is the appliance
customer. İt may take a few
months to see the result but
they will be convincing. We also
market MQM to appliance
manufacturers. Thus, we can work
with you to convince them on the
expected MQM results.
The motors behave
differently when installed on
the appliance. Will MQM help me
screen the motors that are
likely to behave unacceptably
when installed on the appliance?
Absolutely! MQM provides
in-depth information on the
dynamic behavior of the motor,
which is directly related to its
physical structure. Thus, its
possible to screen motors which
have physical characteristics
that would lead to an
unacceptable behavior if
installed on the appliance. The
experimental modeling algorithms
utilized by MQM are uniquely
accurate and had been previously
implemented in more complex
systems such as the helicopter
motor or the space shuttle main
engine.
What is the
expected payback period for MQM?
The pricing of MQM is based on a
1 year payback. That results
from the increase in revenue per
line and the cost saving, due to
scrap and rework reduction. MQM
provides you with unique testing
and quality control capabilities
that you can jointly implement
with your existing customers to
increase the quality level of
their end-product. The new
capabilities would also attract
new customers which value higher
quality levels. All of these
translate into new volume and
higher premiums.
Who needs to
learn how to use MQM and how
long does it take?
Quality Assurance Engineers and
Manufacturing Engineers. It
takes only a few days of
training to learn all of its
functions. We provide this
training free of charge during
the installation. The concept
behind MQM is simple. The
graphical user interface is
highly user friendly and
operates under windows
environment. Thus, once
installed, it is very easy to
get used to it. You can give a
try by installing our Software
Demonstration.
How long does it
take and how difficult it is to
create the initial model of the
motor?
It takes only one or two days to
get fully operational with MQM
on the manufacturing line. The
motor model is created
experimentally through taking
measurements from a set of
motors that represents the
typical production. This would
only take a half-day.
Can I use the
experimental modeling
capabilities in the design
process?
Certainly.
Once MQM is implemented on the
manufacturing line, the design
department will have the mean
and variance information on the
critical design parameters for
100% of the motors manufactured.
İt can utilize this information
to create any remedies at the
design stage to get closer to
the target mean or reduce the
variance.
How can I set
the thresholds for MQM?
The good thing with MQM is that
you can start with your existing
manufacturing variance as the
acceptable level and move your
way upwards. The reference model
creation is done with a set of
motors that represents the
entire manufactured set. Thus,
the mean and variance
information is recorded
automatically and are used as
the starting point.
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