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Start Over Author "Gerada, Chris" Journal ieee transactions on industrial electronics
182 results on '"Gerada, Chris"'

2. Enhanced Estimation of Clamping-Force for Automotive EMB Actuators Using a Switching Extended State Observer

Author

Xu, Zhuang and Gerada, Chris

Abstract

The automotive intelligence and electrification require the braking system to cooperate with the controller to achieve regenerative and active braking functions. Hence, the range and driving safety of the electric vehicles are improved. Electromechanical brake (EMB) systems completely abandon the fluid and hydraulic elements and replace the traditional hydraulic braking system with a wire harness and electromechanical parts. The braking torque adjustment is achieved entirely by controlling the four-wheel EMBs. At present, reliability and fault tolerance are the key technical issues associated with EMBs. To eliminate the need of any clamping-force sensor due to its vulnerability and high cost, in this article, a switching extended state observer (SESO) is presented to provide rapid force estimation with higher precision. The substrates of the internal linear and nonlinear structures have been unified into a single form by using an equivalent gain method. The SESO is effective to detect the initial contact between the braking disk and pad by estimating the load torque. It is experimentally verified that the developed force sensorless control strategy is accurate and superior to the existing techniques.

Published
2024
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4. Single-Phase Short-Circuit Fault Tolerant Control for Five-Phase Permanent Magnet Machines With Copper Loss Reduction

Author

Wang, Huanran, Gu, Chunyang, Wang, Shuo, Zhao, Weiduo, Bai, Shun, Buticchi, Giampaolo, Gerada, Chris, and Zhang, He

Abstract

Five-phase machines represent a widely adopted choice for fault-tolerant applications due to their extra degrees of freedom. This article deals with the single-phase short-circuit fault tolerant control using original transformation matrix for five-phase permanent-magnet machines. The proposed method first follows the fundamental phase current injection (FCI) method based on the calculated SC current. Moreover, third-order harmonic phase current injection (THCI) method is presented to reduce copper loss. The computational method of derating factor is also adopted for industrial applications. The fault tolerance and dynamic performance are also verified by the experimental results. A reduction of copper loss in THCI method by about 15% is achieved, compared with general and FCI methods.

Published
2023
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10. Research and Realization of High-Power Medium-Voltage Active Rectifier Concepts for Future Hybrid-Electric Aircraft Generation

Author

Trentin, Andrew, primary, Sala, Giacomo, additional, Tarisciotti, Luca, additional, Galassini, Alessandro, additional, Degano, Michele, additional, Connor, Peter H., additional, Golovanov, Dmitry, additional, Gerada, David, additional, Xu, Zeyuan, additional, La Rocca, Antonino, additional, Eastwick, Carol N., additional, Pickering, Stephen J., additional, Wheeler, Patrick, additional, Clare, Jon C., additional, and Gerada, Chris, additional

Published
2021
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14. Robust Adaptive Control Based on Variable Boundary for a Twin-Motor Cable-Driven System.

Author

Li, Bin, Yan, Liang, Gao, Xiaoshan, and Gerada, Chris

Subjects
ADAPTIVE control systems, ROBUST control, MATHEMATICAL decoupling, STRUCTURAL engineering, DYNAMICAL systems, CABLES
Abstract

Cable-driven parallel mechanism has been widely studied due to its advantages of fast response and large workspace. The structural uncertainties in the system often introduce internal disturbance and unavoidably influence its motion precision. Generally, to reduce the influence, robust control is adopted and the boundary of the disturbance is regarded as a fixed value given by rough estimation. This method often causes large vibration of the motion component, which certainly compromises the dynamic performance of the system. Therefore, to solve this problem, a variable boundary analytical scheme based on the decoupling of control law and internal disturbance is proposed in this article. Specifically, sufficient condition for the solvability of disturbance boundary is proved by the boundedness of the structural matrix error. Then, the disturbance boundary is modeled analytically, so that its particular value can be determined with respect to the system status. Following that, a robust adaptive control algorithm based on the variable boundary of disturbance is developed. It is verified that the tracking error is globally uniformly bounded. The experimental results show that the proposed control method can effectively reduce the tracking errors and attenuate the tension chattering compared with the conventional robust adaptive control scheme with a roughly estimated boundary. [ABSTRACT FROM AUTHOR]

Published
2022
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17. Optimized commissioning method for enhanced vector control of high-power induction motor drives

Author

Trentin, Andrew, Zanchetta, Pericle, Gerada, Chris, Clare, Jon, and Wheeler, Patrick W.

Subjects
Induction electric motors -- Design and construction, Genetic algorithms -- Usage, Electric driving -- Design and construction, Parameter estimation -- Methods, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper presents a method for improving the control design for a high-power induction motor (IM) drive employing rotor-flux-based orientation. An offline genetic-algorithm routine is used to estimate the electrical and mechanical parameters of the machine using only speed transient measurements. This routine is applied to a range of operating conditions to obtain an accurate knowledge of the IM parameters as a function of the d-axis motor current [i.sub.d]. The information acquired is then employed, together with an enhanced control design obtained by optimizing speed and current transient responses, to increase the performance of the vector control algorithm. The effectiveness of this design method is demonstrated through a wide range of simulations using Matlab--Simulink and experimental results at power levels up to 230 kW. Index Terms--Genetic algorithms (GAs), induction motors (IMs), parameter estimation, rotor-flux control.

Published
2009

20. Integrated PM machine design for an aircraft EMA

Author

Gerada, Chris and Bradley, Keith J.

Subjects
Electromechanical devices -- Design and construction, Magnets, Permanent -- Properties, Tolerance (Engineering) -- Evaluation, Business, Computers, Electronics, Electronics and electrical industries
Abstract

This paper looks at the requirements and challenges of designing a permanent-magnet (PM) motor for a directly driven electromechanical actuator for aerospace applications. Having a directly driven system, the intermediate gearbox is eliminated, bringing advantages in terms of lower component count and reduced jamming probability. The design of a low-speed high pole number PM motor will be investigated as a potential solution. The main goals of the design are a high level of actuator integration in order to minimize weight and volume, fault tolerance, and high reliability. The design will be tailored to the requirements of a typical midspoiler actuation system for a large civil aircraft. Index Terms--Aerospace actuation, electromechanical actuator (EMA), fault tolerance, permanent-magnet (PM) machines, sensorless.

Published
2008

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