11 - PVD 3661 MGV_ commisionning manual_March 2012.docx
3.1.3.
Thermal equivalent torque (rms torque)
SEE PVD 3627_GB
3.1.4.
Acceleration – Deceleration time with MGV motors
SEE PVD 3627_GB
3.1.5.
The drive selection depends on its rated power, nominal current and maximal electrical frequency able to be
managed by the drive and by the flux weakening ratio.
Drive selection
Please refer to the drive technical documentation for any further information and to select
the best motor and drive association.
Short circuit current of the motor must be lower than the permanent current of the
drive
I
cc_motor
< I
S1_drive
Please refer to the drive technical documentation
Short circuit current of the motor must be lower than 0.8 times the peak current of the
drive
I
cc_motor
< 0.8 x I
peak_drive
Please refer to the drive technical documentation
Max back emf of the motor must be lower than the max voltage (from the motor) supported
by the drive
Please refer to the drive technical documentation
The drive must be able to manage the flux weakening and must avoid voltage higher than
the nominal motor voltage at the motor terminals.
Please, check field weakening ratio supported by the drive.
Field weakening ratio = Max speed divided by the basis speed
Due to the maximum electrical frequency able to be managed by the drive, the motor has a
speed limitation given as follows:
(
)
poles
Number_of_
60
*
Hz)
frequency(
Max_drive_
*
2
rpm
limitation
Speed
=
