Hioki 9605-01, Инструкция по эксплуатации, Страница: 96 / 100

APPENDIX 10
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3-phase
power
supply
Motor
Torque
sensor
Load/
motor
3194
Ro
ta
tio
n-
se
ns
or
si
gn
al
Ta
ch
om
et
er
s
ig
na
l
(M
ag
ne
tic
-p
ole
po
sit
ion
si
gn
al)
To
rq
ue
v
al
ue
Inverter
When the rotation-
sensor signal is used
as a reference, if
zero-correction is
performed on the
rotation-sensor signal
phase and the
induced-voltage
phase, the induced-
voltage phase will
coincide with the
reference.
Example of Motor Electrical-Angle Measurement (1)
When a motor is actually run by an inverter, changes in the control of the
inverter and the motor can be determined easily, without significant change
in the wiring for the induced-voltage measurement.
If zero-correction is performed on the phase difference between the rotation-
sensor signal and the induced voltage during the motor induced-voltage
measurement, the relationship between the fundamental wave phases
(electrical angle) of the line voltages and phase currents can be easily seen
on the vector screen, with the induced-voltage phase used as a reference. By
checking the screen, therefore, changes in the control of the inverter and the
motor as a result of fluctuations in the load can be easily determined. The
line voltages may be also expressed as phase voltages (virtual neutral) using
the
Δ - Y conversion function.