PuK - Process Technology & Components 2024

Components
Frequency converter
a 2-pole design, the distribution of the
magnetic field would be worse and the
resulting unsymmetrical utilization of
the magnetic field would increase the
rotor volume by 1.5 times. However,
the required length of the shaft for
this construction would not work due
to bending-critical frequencies. For
this reason, a rotating field frequency
of 2,000 Hz instead of 1,000 Hz is required
to operate a motor with 60,000
rpm, which makes using a high-speed
converter necessary.
… and what impact do they have on
motor losses?
Up to now, two-level frequency
converters were used in these
applications. They generate the required
output frequency via pulse
width modulation (PWM). Depending
on the used switching frequency
and the inductance of the motor,
this method causes a current ripple
of the motor current, though: the
Fig. 2: The three-level technology of the SD4M series by SIEB & MEYER combined with devicedependent
switching frequencies of up to 32 kHz ensures excellent current quality, which reduces
motor losses and increases the efficiency accordingly. (Fig. 2-6: SIEB & MEYER AG)
effective motor inductance of HS motors
drops when the speed increases
and the smoothing of the current
ripple decreases proportionally.
These high-frequency currents cause
additional losses in the motor that
are not negligible as they in turn lead
to increased heat development and
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