Shukang Cheng

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For modern wheeled vehicles, hybrid electric drive system (HEDS) technology can effectively improve their performance, and hence attracts wide attention. As a core part, the in-wheel motor directly affects the capability of the whole system. In order to improve the overload ability of the in-wheel motor, this paper introduces a type of double-stator(More)
High-speed permanent-magnet generators (HSPMGs) are common and important power generation equipment used in distributed generation systems. A 100-kW-level HSPMG is investigated in this paper, and its cooling system is optimized through electromagnetic-fluid-thermal analysis. First, the 2-D electromagnetic field of the machine is calculated by using the(More)
Free-piston energy converter, composed of a free-piston engine and a permanent-magnet (PM) linear machine, is a promising generator concept for series hybrid electric vehicles (HEVs). In this paper, a novel transverse-flux PM linear machine is investigated for such applications. Unlike conventional transverse-flux machines, the proposed machine features(More)
It is a goal for the investigator pursuing to how to improve the efficiency of the induction coil launcher (ICL). In order to enhance the efficiency, the influences of the driving current's wave on the accelerative performance in single-stage ICL are investigated. Combined the bipolar driving manner and the single-polar driving manner, the dynamic working(More)
An analysis of the critical inductance and capacitor voltage ripple of bidirectional Z-source was presented in this paper. Varying inductances were found to lead to different operational modes of the inverter. The critical inductance was derived. While the Z-source capacitor voltage ripple is traditionally considered to be independent of the inductance with(More)
Interior permanent magnet (PM) synchronous motors are widely used in electric vehicle, where limited space for motors is one of the most crucial challenges. This paper proposes an analytical design method to decrease iron losses, which saves much computation time compared with the parameter sweep method adopting finite-element analysis (FEA). The new method(More)
Model reference adaptive system(MRAS) is introduced in speed estimation for salient pole permanent magnet generator(PMSG) in wind turbine system. Firstly, current model for the salient pole PMSG is established and used as adjustable model, and the salient pole PMSG itself is used as reference model, then the adaptive law is derived. The estimated speed is(More)
To improve the torque performance of wheel motor, a concentrated winding motor with 12-slot-10-pole, embedded magnets rotor structure is presented in this paper. The influence of motorpsilas parameters such as the PMpsilas magnetization orientation length, the winding turns and inner diameter of stator on output torque is discussed by using finite element(More)
Surface-mounted permanent-magnet (PM) synchronous motors are widely applied to electric vehicles, where iron losses reduction is a crucial target. This paper proposes a new method of PM shape optimization to reduce the harmonics of magnetic field and, hence, iron losses. The proposed method is based on the analytical calculation of magnetic field(More)
Yushan et al., and Siwakoti et al., proposed that “the ZSVM4 resulted in the lower current ripples when compared to ZSVM2.” However, some different opinions were presented in this paper. With the space vector modulations (SVMs) strategy, the ZSVM4 results in the lower current ripples when compared to ZSVM2 in parts angle intervals. While in(More)