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This paper concerns performance of a direct torque and flux controlled 14-pole/18-slot fractional-slot concentrated-winding interior permanent magnet synchronous machine (FSCW-IPMSM) in deep flux-weakening region. For the optimum operation of the machine, voltage limit, current limit, MTPA and MTPV trajectories defined on the torque-flux plane are incorporated in the control algorithm. In the experiment,...
This paper proposes a current trajectory control strategy considering cross coupling and magnetic saturation effect under voltage and current constraint. It introduces geometric positions of torque and voltage increment in dq axis framework to determine the differentials between target values and results of the previous iteration, and then converts the torque and current differentials into current...
An interior permanent magnet synchronous motor (IPMSM) model using the extended electromotive force (EMF) is one of the simple models and is used in sensorless vector control systems. This paper proposes a simplified system which takes into account a cross coupling compensation to estimate the rotor position without using observer. The effectiveness of proposed method is verified by simulation and...
During the operation of a DC-to-DC converter in a vehicle, Volt-sec. is inherently embedded in a duty ratio and sourced to change inductor flux linkage, generating the output voltage trajectory compatible with the automotive e-drive command trajectory. With a flux linkage focus, the improved generalized Steinmetz equation (iGSE), i.e. the existing method for estimating core loss for nonsinusoidal...
The main purpose of this paper is to explore the spontaneous synchronization of two Chua's circuits based on coupled memristors with cubic nonlinearity. An analog circuit is designed to simulate the magnetic flux controlled memristor with coupling effects and then applied to implement the coupled Chua's circuit. Simulation is carried out to numerically exhibit the strange attractors and spontaneous...
This paper proposes an improved stator flux control algorithm based on the torque feedforward control technique for interior permanent magnet synchronous motor (IPMSM). The proposed flux linkage control algorithm can prevent the d and q- axis voltages from saturation and improve the dynamic behavior. A lookup table is used in the torque feedforward control technique, which outputs the desired d and...
High-performance permanent-magnet synchronous machines show nonlinear behavior due to saturation effects. Nonlinear differential equations describe these phenomena which makes feedback control challenging. This paper presents a unified approach based on the current, flux linkage and voltage plane to visualize the physics of machine dynamics. A predictive control method to precisely control arbitrary...
Recent research suggest many flux weakening control techniques for interior permanent magnet synchronous motors. The most established one is the use of two current controllers to control the direct and quadrature axis current components such that the total flux linkage is reduced. If the characteristic current of the motor is less than the rated current of the system, maximum torque per voltage control...
High performance interior permanent magnet synchronous machines show nonlinear magnetics due to saturation and cross-coupling. Nonlinear differential equations describe these phenomena and make feedback control challenging. This paper presents a predictive control method to precisely control the dynamics of these machines. Four real-time capable strategies to online identify transient trajectories...
This paper proposes multivariable robust control for a gait trainer for people with walking disability. The gait trainer composes of linkages and motors, which drive the linkages to produce preferred gait traces. To simplify the traditional motor control, the tracking error and motor current are feedback for control design to regulate the motor voltage. First, the transfer function matrices of the...
An increasing number of research groups develop dedicated hybrid analog/digital very large scale integration (VLSI) devices implementing hundreds of spiking neurons with bio-physically realistic dynamics. However, despite the significant progress in their design, there is still little insight in translating circuitry of neural assemblies into desired (non-trivial) function. In this work, we propose...
This paper presents an optimum direct thrust force control for interior permanent magnet linear synchronous motor (PMLSM) over wide velocity range in which the maximum thrust force per ampere (MTPA) strategy is used below the base velocity and field weakening strategy is used above the base velocity. Using MTPA strategy, copper losses is minimized in constant force region, and using field weakening...
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