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MPH-02, MPB-02, MPD-02
Restrictions for Saturation
Method
Restrictions for Sine-Wave
Method
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
• saturation method (without constraint of motion)
(with current → possible with all types of construction in combination
with motor encoders that can be evaluated in absolute form and with
relative motor encoders; but see below "Restrictions for Saturation
Method")
• sine-wave method (with constraint of motion)
(with current → possible with all types of construction with motor
encoders that can be evaluated in absolute form and with relative
motor encoders; but see below "Restrictions for Sine-Wave Method")
Note:
The sine-wave method (generally with constraint of motion)
should only be used if the saturation method cannot be used!
Applications of synchronous motors
third-party motors that without or with only
little saturation effects
applications with relative measuring
system (without using the optimum
commutation offset value with regard to
the reference point)
applications with relative measuring
system that are using the optimum
commutation offset value with regard to
the reference point
drives that can be in motion during the
determination of the commutation offset,
e.g. coasting spindles, printing roller
drives etc.
drives with low inertia and little friction
drives with a low degree of overload
capacity
Fig. 6-16:
Typical applications and restrictions for saturation method
Applications of synchronous motors
linear axis with single motor or parallel
motor
linear axes in Gantry arrangement
rotary axes with single drive
rotary axes, mechanically connected
Fig. 6-17:
Typical applications and restrictions for sine-wave method
Drive Control
Restrictions for saturation
method
Saturation method cannot be used
for determining commutation
offset!
Max. torque/force can be reduced
by approx. 15% compared to the
optimum value (automatic
detection of commutation offset
with "AF")!
Max. torque/force until reference
mark is passed can be reduced by
approx. 15%!
Saturation method only possible
for motors in standstill!
Axis might move when current is
supplied, saturation method only
successful for motors in standstill!
Saturation method only successful
if amplifier current is sufficiently
high (2...4-fold continuous motor
current required)!
Restrictions for sine-wave
method
Only balanced (e.g. horizontal)
axes with little friction!
Only balanced (e.g. horizontal)
axes with little friction!
In addition, both drives have to
carry out sequential commutation
settings, "AF" then mustn't be
active at the other drive!
Only balanced axes with little
friction; high inertia can cause
problems!
see above "linear axes in Gantry
arrangement"
6-21
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