Some Aspects Of Pulse Voltage Regulation For Induction Motor Soft ...

Fig. 10. 4MTKF160LB8 induction motor speed curve with underspeed operation
at 8,33 Hz during quasi-frequency control.
6. Conclusions
Pulse voltage regulator based on a power circuit
with 3 power switches and a shunt diode bridge has
a number of obvious advantages over the thyristor
voltage regulator such as:
- reduced energy losses in the induction motor
transients due to symmetrical power circuit structure
and lack of output voltages and currents phase
asymmetry;
- lowered impact on supply mains due to the
better harmonic content of the PVR output voltage
and current curves;
- increased power factor and lack of 1st harmonic
current shift angle;
- quasi-frequency control ability for the induction
motor steady operation at underspeeds.
PVR with quasi-frequency control ability if
compared to thyristor voltage regulator can be
considered an improved softstarter device and is a
cheaper alternative to a frequency converter
provided there are no strict speed control
requirements for a certain technological mechanism.
For example, it would be reasonable and costeffective
to apply such PVR in the crane electric
drive of a trolley traveling mechanism.
Bibliography
[1] Firago Bronislav, Vasilyev Dmitry, Pawlaczyk
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Authors:
PhD student
Vasilyev Dmitry
Belorussian National
Technical University
F. Skaryna 65
Minsk 220027
Belarus
email: dmy@tut.by
Prof. Firago Bronislav
Belorussian National
Technical University
F. Skaryna 65
Minsk 220027
Belarus
email: dmy@tut.by