A Study of the Dynamic Performance Improvement of a Linear Compressor Stroke Controller with a Current Control Loop

<span lang="EN-US">A new closed loop AC to DC ĈUK converter is presented in this paper. The conventional ĈUK AC to DC converter has no feedback circuit. Thereby, the output voltage of the converter changes while changing the load. The proposed closed loop converter can regulate voltage with the variation of load over a wide range. Moreover, the power factor and Total Harmonic Distortion (THD) of the supply side current found quite satisfactory from this closed loop ĈUK converter. The converter operates in four steps with a different combination of voltage polarities and switching states. The feedback path consists of a voltage control loop and a current control loop. The closed loop ĈUK converter in this study is compared with the open loop version. Additionally, the comparison is made with the conventional converter of the same topology. The effectiveness in terms of power factor and THD of the proposed converter is verified using simulation results.</span>

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Force Controllers for AMB Systems with Position and Current Feedback

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.198.495 ◽

2013 ◽

Vol 198 ◽

pp. 495-500 ◽

Cited By ~ 2

Author(s):

Rafał P. Jastrzębski ◽

Alexander Smirnov ◽

Olli Pyrhönen

Keyword(s):

Position Control ◽

State Of The Art ◽

Dynamic Performance ◽

Current Control ◽

Control Loop ◽

Control Solution ◽

Current Feedback ◽

Zero Bias ◽

Control Loops ◽

Control Schemes

In this paper, the state-of-the-art AMB controller structure, with an outer centralized position control loop with reference currents and inner current control loops, is replaced with an outer control loop with force references and inner flux control loops. The linearization of the force actuators and different control schemes of the centralized outer control for the radial suspension are considered. The operation of the proposed control under a zero bias is verified by simulations. The proposed control solution can achieve a dynamic performance comparable with that of a controller with the classical bias current.

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Improved Position Control of Electro Mechanical Actuator Utilizing Optimal Current Trajectory Control

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.551.548 ◽

2014 ◽

Vol 551 ◽

pp. 548-554

Author(s):

He Song Liu ◽

Yong Ling Fu ◽

Juan Chen ◽

Hui Chen

Keyword(s):

Position Control ◽

Dynamic Performance ◽

Permanent Magnet Synchronous Motor ◽

Current Control ◽

Trajectory Control ◽

Control Loop ◽

Drive Unit ◽

Fighter Aircraft ◽

Speed Range ◽

Optimal Current

Electro mechanical actuator (EMA) is an important type of power-by-wire (PBW) actuator. The dynamic performance of EMA is a key issue especially when it is mounted on a fighter aircraft. Generally, the EMA adopts permanent magnet synchronous motor (PMSM) as the drive unit. It is a position controlled cascade system with an inner current control loop. This study focuses on the current control loop and proposes a scheme which utilizes optimal current trajectory control to exploit the inherent torque capability of the motor. Compared with traditional current control, i.e. id=0 strategy, the torque capability of the motor is maximized and the speed range is expanded. This directly improves the EMA dynamic performance. Faster transient process is demonstrated experimentally, which verifies the efficiency of the proposed scheme.

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