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constant, the motor will slow to zero and then accelerate in the forward direction, passing
back into quadrant I.
The injection frequency must always be opposing the direction of rotation and is only used in
the case of braking or negative energy flow. Therefore, it is zero in the motoring quadrants (I
and III) and is the inverse polarity of the electrical frequency in the braking quadrants (II and
IV).
6.1.2
Signal Polarities
Table 6- 1
Signal Polarities
Signals
Rotation speed (ω
)
r
Electrical frquency (ω
)
s
Slip (ω
)
slip
Torque
Current (I
)
q
Voltage (V
)
qs
Acceleration (ω
)
inj
Injection Frequency
Power (flow)
Mag Current (I
)
d
Voltage (V
)
ds
Note
For the electrical frequency (ω
the rotational speed, when the speed magnitude approaches the slip magnitude, the
electrical polarity is uncertain (when the slip magnitude is greater than the rotor speed, the
sign will match that of the slip rather than the sign of the rotor speed).
Product User Manual
Operating Instructions, Version AE 12/2009, A5E01454341C
Quadrant 1
+
+
+
+
+
+
0
+
+
+
) in the braking quadrants (II and IV) where the slip opposes
s
6.1 Signal Frame of Reference for Motor Control
Quadrant 2
Quadrant 3
-
-
+
+
+
+
+
+
-
+
+
Application and Operation
Quadrant 4
-
+
-
+
-
-
-
-
-
-
-
-
-
-
0
-
+
-
+
+
+
+
107
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