Implementation of a Sensorless Synchronous Motor Drive Control System with Prescribed Closed-Loop Speed Dynamics

1
VECTOR CONTROLLED RELUCTANCE SYNCHRONOUS MOTOR
DRIVES WITH PRESCRIBED CLOSED-LOOP SPEED DYNAMICS

2
Model of Reluctance Synchronous Motor
Non-linear differential equations formulated in
rotor-fixed d,q co-ordinate system describe the
reluctance synchronous motor and form the basis
of the control system development.
3
Control Structure for Reluctance Synchronous Motor
4
Master Control Law
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SET OF OBSERVERS FOR STATE ESTIMATIONAND
FILTERING
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Pseudo-Sliding Mode Observer for Rotor Speed
definition of error
Motor equations
Model system
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Angular velocity extractor
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The Filtering Observer
VJ
Electrical torque of SRM is treated as an
external model input
9
Original control structure of speed controlled RSM
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MRAC outer loop
Inner Middle Loop (real system)
correction loop
Reference Model (of closed-loop system)
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Simulation results a1) idconst without MRAC
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Simulation results a2) idconst with MRAC
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Simulation results (without MRAC) b1) dq-current
angle control
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Simulation results (with MRAC) b2) dq-current
angle control
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Effect of MRAC on Various Types of Prescribed
Dynamics
b) first order dyn.
c) second ord. dyn.
a) constant torque
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Conclusions and Recommendations

• The simulation results of the proposed new
  control method for electric drives employing SRM
  show a good agreement with the theoretical
  predictions.
• The only departure of the system performance from
  the ideal is the transient influence of the
  external load torque on the rotor speed.
• This effect is substantially reduced if MRAC
  outer loop is applied.
• It is highly desirable to employ suggested
  control strategy experimentally.