56
( a ) Torque boost of constant torque curve
( b ) Torque boost of square torque curve
Fig.
Fig.
Fig.
Fig. 4
4
4
4 — 3
3
3
3 Torque
Torque
Torque
Torque boost
boost
boost
boost
This function define s the cut-off frequency of torque boost, as shown in Fig. 4-3 as Fz. Then cut-off frequency is suitable for
any V/F curve defined
by
P0.02 .
0
0
0
0 : Manual
Manual
Manual
Manual torque
torque
torque
torque boost
boost
boost
boost
Torque boost voltage is defined
by
parameter P0.09. The boost voltage is fixed while motor will be easily magnetism
saturation with light load.
1
1
1
1 : Auto
Auto
Auto
Auto torque
torque
torque
torque boost
boost
boost
boost
Torque boost voltage will change with the motor stator
’
s current changes. The bigger the stator is
,
the higher the boost
voltage.
Carrier frequency will effect s the motor
’
s noise and heat waste.The relationship among carier frequency, motor noise, leak
current, and dist are shown below: