A 2-degree-of-freedom (2DoF) induction machine realizes rotary, linear and helical motions, exhibiting the merits of integrated structure and high material utilization. Compared with traditional electric machines, one of the special factors affecting the electromagnetic performances is the helical motion coupling effect (HMCE). This paper systematically investigates its production mechanism based on the proposed HMCE model firstly. Then a comprehensive comparison of the torque performances betwe...
Automatic manipulation of deformable objects is a challenging problem. Improper operations, such as excessive stretching, collision, are easy to cause damages to the deformable objects. Thus, not only the final configuration but also the trajectory of the deformation is supposed to be controlled during the process of interaction. In this paper, a model-free method to control the trajectory of the deformation in the unknown environment is proposed. We design an adaptive dynamic controller that ad...
This paper presents a convex inner approximation approach for mixed H2/H-Infinity control of a flexure-based nano-positioning system. Generally for such positioning systems, the inevitable existence of model mismatch renders it often-times difficult to achieve satisfying system performance. Additionally, it is essential to note that the high-order resonances typically presented are prone to be activated if the controller is not designed appropriately, especially in the case when the control inpu...
Last. Ping Wang(CAS: Chinese Academy of Sciences)H-Index: 36
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Due to the power interaction between the phase-shifted dual active bridges (PSDABs) and series resonant dual active bridges (SRDABs) in the hybrid modular DC Transformer (HMDCT), it is difficulty to optimize current stress based on the transferred power. An extended-state-observer based model predictive control (ESO-MPC) strategy with the extended phase shift (EPS) is proposed to optimize the current stress of the PSDABs in the HMDCT. The MPC is employed to calculate the optimal transferred powe...
In dual-motor servo systems, several factors seriously affect the tracking performance especially in high-speed and high-accuracy situations, which include machinery flexibilities, torque disturbance, unmodeled dynamics, and motor parameter differences. Given these factors, this paper investigates the command filtered backstepping synchronization control (CFBSC) method for a servo system driven by two motors synchronously. Command filters are used to deal with the virtual control signals in back...
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