MQM is based on system parameter
estimation.
One process involves taking measurements
from a set of motors; parameters that
relate to the electro-mechanical
properties of each motor are computed.
Inductance properties
> Inductance (L)
Resistance properties
> Resistance (R)
> Motor constant (k)
Mechanical
properties
> Moment of inertia of the rotor (J)
> Friction coefficient (f)
Performance curves are computed and can
be compared to the given specifications.
Performance curves can be estimated
for
;
Performance curves are in agreement with
dynamometer results.
Deviations outside established and
acceptable threshold limits are
determined.
Measured output is compared with
modelled output and if deviations are
outside pre-determined threshold limits,
the motor is identified as faulty.
MQM also calculates the Power Spectral
Density (PSD) of the current signal
measured during test, allowing the user
gain deeper insight to the causes of the
faults
MQM’s approach to Quality Control :
-
Thirty different parameters are
monitored to describe the quality of
the motor.
-
The reference is a mathematical
model which represents the general
characteristics of production and
its natural variances.
-
The
user can
choose flexible tolerances.
