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A performance study of reluctance synchronous machines fed by non-sinusoidal currents
Author(s)
Prins, Michiel Hendrik Albertus
Date Issued
2011
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
Reluctance synchronous Machines (RSM's) have become a viable alternative for alternating
current (ac) drives since electronic drives have improved. These electronic drives make use of
static switching devices to control the speed and torque of ac machines. The output
waveforms of these devices contain numerous harmonics which can have harmful effects on
some of the machine's performance parameters. Performance parameters of the RSM include
torque, torque ripple, power, power factor and efficiency which are essential for the machine
designer as well as the user. Poor efficiency of the RSM is mainly due to the copper losses of
the stator windings and core losses in the stator iron. The core losses primarily consist of
hysteresis- and eddy-current losses as well as additional losses which are due to domain wall
rotation and pinning. Unlike the Induction Machine (JM), the RSM has no copper losses in
the rotor, which reduces the operating temperature of the machine considerably.
This thesis will focus on the influence non sinusoidal currents have on the performance
parameters of a RSM. The machine will be subjected to ideal harmonics created by a six
pulse drive which are theoretically predicted based on the operation of a six pulse drive. The
machine will also be subjected to published data which are measured data for a more
practical approach. These two cases will be compared to rated operating conditions.
current (ac) drives since electronic drives have improved. These electronic drives make use of
static switching devices to control the speed and torque of ac machines. The output
waveforms of these devices contain numerous harmonics which can have harmful effects on
some of the machine's performance parameters. Performance parameters of the RSM include
torque, torque ripple, power, power factor and efficiency which are essential for the machine
designer as well as the user. Poor efficiency of the RSM is mainly due to the copper losses of
the stator windings and core losses in the stator iron. The core losses primarily consist of
hysteresis- and eddy-current losses as well as additional losses which are due to domain wall
rotation and pinning. Unlike the Induction Machine (JM), the RSM has no copper losses in
the rotor, which reduces the operating temperature of the machine considerably.
This thesis will focus on the influence non sinusoidal currents have on the performance
parameters of a RSM. The machine will be subjected to ideal harmonics created by a six
pulse drive which are theoretically predicted based on the operation of a six pulse drive. The
machine will also be subjected to published data which are measured data for a more
practical approach. These two cases will be compared to rated operating conditions.
Additional information
Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2011
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20117219_Prins_MHA_Mtech_Elec_Eng_2011_20117219.pdf
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Thesis
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