Lenze i550 - Motor Control Types

Motor control types
The inverter provides various motor control types.
Linear V/f
characterisc control
The output voltage is increased proporonately to the output frequency.
In case of low output frequencies, the motor voltage can be increased to ensure a minimum
current for the breakaway torque. In the eld weakening range, the output voltage of the
inverter is constant (mains voltage) and the frequency can be further increased depending on
the load. The maximum torque of the motor is reduced squarely to the frequency increase.
the maximum output power of the motor being constant.
Applicaon areas are for instance: Single drives with constant load.
f
N
f
P, U, M
M
N
U
AC
P
N
P Power M
r
ated
Rated torque
V Voltage f
rated
Rated frequency
M Torque M
rated
Rated torque
f Frequency f
rated
Rated frequency
Square-law V/f characterisc control
The output voltage is increased squarely to the output frequency.
In case of low output frequencies, the motor voltage can be increased to ensure a minimum
current for the breakaway torque. In the eld weakening range, the output voltage of the
inverter is constant (mains voltage) and the frequency can be further increased depending on
the load. The maximum torque of the motor is reduced squarely to the frequency increase.
the maximum output power of the motor being constant.
Applicaon areas are for instance:
•
Pump
s
•
Fans
•
Fan
f
M, U
U
AC
f
N
Appendix
Good t
o know
Motor control types
138