4 research outputs found
Circulating Current Induced Electromagnetic Torque Generation in Electric Machines with Delta Windings
This paper explains the phenomenon of current circulation and the resulting
electromagnetic torque generation in electric machines employing delta
windings. The description entails a systematic assessment of the electrical and
magnetic behavior of the machine to develop mathematical models, followed by
intuitive explanations of the derived analytical forms. The modeling is
thoroughly validated through simulation and experimental results on a prototype
machine
Position Sensing Errors in Synchronous Motor Drives
Non-ideal position estimation results in degraded performance of synchronous
motor drive systems due to reduction of the average capability of the drive as
well as torque harmonics of different orders. The signature and extent of the
performance degradation is further dependent, quite significantly, on the
current control architecture, i.e., feedforward or feedback control, employed.
This paper presents a comprehensive analysis of non-idealities or errors in
position estimation and their effects on the control performance of synchronous
motor drives. Analytical models capturing the error in various signals caused
by position sensing errors in the drive system for different control
architectures are presented and are validated with simulation and experimental
results on a prototype permanent magnet synchronous motor drive
Performance Analysis of Synchronous Motor Drives under Concurrent Errors in Position and Current Sensing
Field oriented control of permanent magnet synchronous motor drives involves
the closed-loop regulation of currents in the synchronous reference frame. The
current feedback is directly affected by errors in both position and stationary
frame current measurements. This paper presents the exact analytical expression
for estimated synchronous frame currents under simultaneous errors in both
sensors along with a detailed analysis of the incorrect estimation on the
closed-loop current control performance
Control Performance Analysis of Power Steering System Electromechanical Dynamics
Modern power steering systems employ an electric motor drive system to
provide torque assistance to the driver. The closed-loop mechanical system
dynamics that impact stability, performance and steering feel are significantly
impacted by the electrical dynamics of the actuator depending on the structure
and tuning of the motor torque controller. This paper presents an integrated
approach to the analysis of this electromechanical dynamic control interaction
through mathematical modeling which is confirmed with simulations