Star-delta starter
This is the most popular and commonly
used starting method for motor ratings
> 4 kW (400 V).
• Electronic motor starter (EMS) and soft
starter
These enable the soft and low-noise
starting of the motor. This eliminates
interference producing current peaks
and jerks during switching. The startup
and deceleration phase of the motor can
also be time-controlled depending on the
load.
• Frequency inverter
This enables time-controlled motor
starting, motor braking and operation
with infinitely variable motor speeds.
Depending on the application, different
types of frequency inverters are used:
– with the voltage/frequency control
(U/f) or vector control for
frequency-controlled motor operation,
– with vector control or servo control for
high speed accuracy and additional
torque adjustment.
Associated circuit diagrams
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