Synchronous Motor Drive Control System with Prescribed Closed-Loop Speed Dynamics

1
Synchronous Motor Drive Control System with
Prescribed Closed-Loop Speed Dynamics

• Dodds, J., Stephen, Vittek, Ján
• University of East London, School of Computing
  Technology, UK
• University of Žilina, Faculty of Electrical
  Engineering,
• Dept. of Power Electrical Systems, SK

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Model of Permanent Magnet Synchronous Motor
Non-linear differential equations formulated in
the magnetic field-fixed d,q co-ordinate system
describe the permanent magnet synchronous motor
and form the basis of the control system
development.
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Control System Structure For PM Synchronous Motor
SJD
4
Complete control structure of electric drive with
synchronous motor
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Discrete Time Two-Phase Oscillator
The discrete time two-phase oscillator produces
the transformation matrix elements, needed for
the transformation blocks.
6
Master Control Law
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Acceleration Demands for Three Various Dynamics
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Slave Control Law
A High Gain Proportional Control Law with Voltage
Saturation Limits was used for simulation Bang-Ban
g Control Law Operating in the Sliding Mode
(switching strategy for two-phase version is
satisfactory determined).
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The Sliding Mode Observer and Angular Velocity
Extractor
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The Filtering Observer
VJ
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EXPERIMENTAL RESULTS
Electric drive with synchronous motor consists of
synchronous machine with nominal parameters
Parameters of IGBT FUJI 6MBI-060 are as follows-
nominal voltage 600 V , nominal current 6x10
A. Current sensors are as follows- LEM LTA
50P/SPI.
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Measured Results for Synchronous Motor with
Constant Acceleration
Complex Current
Current v. t
2
2
0
0
0
-2
-2
-2
Mg. Flux v. t
2
0
0.5
Complex Mg. Flux
0.2
0.2
0
0
0
-0.2
-0.2
-0.2
Observed Values
0.2
0
0.5
Rotor Speed
100
100
50
50
0
-50
0
0.5
1
0
0.5
1
0
-0.5
T1 0.1 s , wd 60 rad/s
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Measured Results for Synchronous Motor with
Constant Acceleration - osciloscope screen
1 - angular velocity, 2 - current in phase A
T1 0.1 s , wd 60 rad/s
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Experimental results for idle running synchronous
motor and first order speed demand .
T1 0.05 s , wd 80 rad/s
15
Experimental results for idle running synchronous
motor and second order speed demand - osciloscope
screen
1 - angular velocity, 2 - current in phase A
Tset 0.15 s , wd 80 rad/s
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Experimental results for idle running synchronous
motor and second order speed demand
Tset 0.15 s , wd 80 rad/s
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Experimental results for idle running synchronous
motor and first order speed demand - osciloscope
screen
1 - angular velocity, 2 - current in phase A
T1 0.05 s , wd 80 rad/s
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Experiments with 2nd Order Dynamic for Various
Damping
Tsettl0.3 s , wd 40 rad/s
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Experimental Results for Synchronous Motor Drive
Control of theangle between rotor flux and
stator current vectors
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Conclusions and Recommendations

• A new approach to the control of electric drives
  with permanent magnet synchronous motors, based
  on feedback linearisation has been developed and
  experimentally proven.
• Three various prescribed dynamics to speed
  demands were achieved.
• Further research will focus on the application of
  the new approach to enhancement of control system
  for outer loop based on MRAC or SMC to improve
  precision of control.