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Electronic motor starters and drives
Frequency inverters DF5, DV5, DF6, DV6 |
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| Design and mode of operation |
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Frequency inverters provide variable, stepless speed
control of three-phase motors.
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| Frequency inverters convert constant mains voltage and
frequency into a DC voltage, from which they generate a new three-phase
supply with variable voltage and frequency for the three-phase motor.
The frequency inverter draws almost only active power (p.f. ~ 1) from
the supplying mains. The reactive power needed for motor operation is
supplied by the DC link. This eliminates the need for p.f. correction on
the mains side. |
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The frequency-controlled three-phase motor is today a
standard component for infinitely variable speed and torque regulation,
providing efficient, energy-saving power either as an individual drive
or as part of an automated installation.
The possibilities for individual or plant-specific coordination are
determined by the specific features of the inverters and by the
modulation procedure used.
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