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Continuous magnetization
The Continuous magnetization feature is active by selecting a digital signal such as a
user bit in the fieldbus control word. This can be useful in processes that require
motors to be stopped (for example, to stand by until new material is processed), then
quickly started without magnetizing them first.
Note: Continuous magnetization is only available in speed control in DTC motor
control mode (see page 43), and only when ramping is the selected stop mode (see
parameter
21.03 Stop
WARNING: The motor must be designed to absorb or dissipate the thermal
energy generated by continuous magnetization, for example by forced
ventilation.
Settings
Parameters
06.21 Drive status word 3
Magnetization
time, 21.08...21.12,
heating current
(page 247).
Hexagonal motor flux pattern
Note: This feature is only available in scalar motor control mode (see page 43).
Typically, the drive controls the motor flux so that the rotating flux vector follows a
circular pattern. This is ideal for most applications. However, when operating above
the field weakening point (FWP), it is not possible to reach 100% of the output
voltage. This reduces the peak load capacity of the drive.
Using a hexagonal motor flux vector pattern, the maximum output voltage can be
reached above the field weakening point. This increases the peak load capacity
compared to the circular pattern, but the continuous load capacity in the range of
FWP ... 1.6 × FWP is reduced because of increasing losses. With hexagonal motor
flux active, the pattern changes from circular to hexagonal gradually as the frequency
rises from 100% to 120% of the FWP.
Settings
Parameters
97.18 Hexagonal field weakening
point
(page 495).
mode).
(page 173),
21.14 Pre-heating input source
Standard program features 105
21.01 Start
mode,
and
97.19 Hexagonal field weakening
21.02
and
21.16 Pre-
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