Delta Tau GEO BRICK DRIVE Manuale Utente
Geo Brick Drive User Manual
Motor Setup
205
Optimizing Magnetization Current Ixx77, Slip Gain Ixx78
Magnetization current
Caution
During the optimization procedure, the motor will rotate up to its
maximum
maximum
velocity.
Make
sure
that
the
motor
is
well
mounted/clamped and uncoupled from any rotating inertia.
Always be ready to issue a Kill if the motor exceeds its maximum
specified speed.
Always be ready to issue a Kill if the motor exceeds its maximum
specified speed.
With AC Induction motors, the magnetization current Ixx77 is used to provide a stator current component
parallel to the estimated rotor magnetic field (the “direct” current -- the control loop then determines the
magnitude of the “quadrature” current perpendicular to this component).
In open loop mode, and given a fixed magnetization current Ixx77, the induction motor will accelerate at
the slip gain rate Ixx78 and reach a certain base speed. This, theoretically, is the motor name plate speed.
It usually specifies the maximum motor speed before applying field weakening.
Field weakening consists of lowering the magnetization current in order to achieve speeds superior to the
motor base speed (name plate). The lower the magnetization current, the higher is the speed that can be
achieved.
Mag Current
Ixx77
Voltage/
Speed
(RPM)
(RPM)
Base
Speed
Nominal Field
Weakening
Nominal, at full motor voltage (230V)
208 VAC bus, Higher Ixx77
208 VAC bus, Optimized Ixx77
208 VAC bus, Lower Ixx77
Max Speed(s)
Before Field
weakening