International Journal of Applied Electromagnetics and Mechanics - Volume 52, issue 1-2

Authors: Zhao, Fei | Lin, Hai | Kwon, Byung-Il

Article Type: Research Article

Abstract: In this paper, an investigative study on the effect of various notch depths and notch location angles in the U-core stator permanent magnet motors is presented, which aims to obtain the proper design combination of notch parameters for the better motor performance. Finite element method is carried out for the motor performance evaluation such as the starting torque, cogging torque as well as the phase back-EMF. The results show that there are certain ranges of the notch depth and the notch location angle to generate the larger back-EMF and starting torque with less cogging torque. Finally, the Simulink models are …built and the prototypes are tested for their dynamic performance comparison. Show more

Keywords: Airgap notch design, back-EMF, cogging torque, starting torque, U-core stator motor

DOI: 10.3233/JAE-162042

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 835-842, 2016

Authors: Chen, Yuansheng | Qiu, Jinhao | Wu, Junji

Article Type: Research Article

Abstract: Piezoelectric actuators have been widely applied in micro- and nano-positioning devices, but the hysteresis nonlinear property limits the performance. An adaptive control is designed for hysteresis compensation in piezoelectric actuator. The Prandtl-Ishlinkii model is proposed to describe the inverse of piezoelectric actuator. The weight parameters of Prandtl-Ishlinkii model is updated on real-time control. Experimental results show that the proposed control method can effectively update the weight parameters for real-time control.

Keywords: Prandtl-Ishlinskii model, adaptive control, neural network, hysteresis compensation, piezoelectric actuators

DOI: 10.3233/JAE-162229

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 843-850, 2016

Authors: Zhu, Zhiwen | Li, Xinmiao | Xu, Jia

Article Type: Research Article

Abstract: A type of giant magnetostrictive-piezoelectric composite vibration energy harvester is proposed in this paper, and its stochastic nonlinear dynamic characteristics are studied. Giant magnetostrictive material is applied to induce the harvester's self-excited vibration to improve its efficiency. Nonlinear differential term is introduced to explain the hysteresis phenomena of a giant magnetostrictive material, and the fitting effect of the constitutive model on experimental data is proved by the partial least-square regression method. The nonlinear dynamic model of a giant magnetostrictive-piezoelectric vibration energy harvester subjected to stochastic foundational excitation is developed, and the stationary probability density function of the system's response is …obtained. The transition sets of the system's response are determined, and the conditions of stochastic bifurcation are obtained. Numerical and experimental results show that the stochastic Hopf bifurcation occurs when the parameters varies; the output voltage is quasi-periodic, which means the effective utilization to the environmental stochastic excitation. Show more

Keywords: Giant magnetostrictive material, piezoelectric ceramics, vibration energy harvester, stochastic bifurcation

DOI: 10.3233/JAE-162041

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 851-858, 2016