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Owing to getting rid of brushes and slip rings, the magnetic-field modulated brushless double-rotor machine (MFM-BDRM) can be a promising candidate for the electrical-continuously variable transmission (e-CVT) in hybrid electric vehicles (HEVs). However, since there are many magnetic-field harmonics with the high rotating speed in the air gap, the PM loss is a big problem in traditional MFM-BDRMs...
With the advantage of independent speed control of two rotors, the double-rotor machine (DRM) can be a promising candidate for the electrical-continuously variable transmission (e-CVT) in hybrid electric vehicles (HEVs). Since the DRM with brushes and slip rings has problems of extra losses, low reliability, and maintenance, the brushless DRM would be a preferable selection. In this paper, a new magnetic-field...
This paper presents analytically derived optimal 3rd harmonic into phase current waveforms to improve the output torque of five phase surface-mounted PM (SPM) machines with the constraints of peak and rms values. The output torque with the 3rd harmonic current is analytically established and the optimal value of 3rd harmonic injected into the current waveform for maximum torque improvement is analytically...
This paper investigates the torque characteristics of an 18-slot/10-pole fractional-slot surface-mounted permanent-magnet (SPM) machine and presents its comparison with conventional 9-slot/10-pole and 12-slot/10-pole SPM machines by analytical and two-dimensional (2-D) finite element analysis (FEA). The winding factors of the 18-slot/10-pole machine are firstly analyzed, and then, its back-EMF, average...
A compact flywheel energy storage system assisted by axial-flux partially-self-bearing permanent magnet motor has been proposed by the authors. The proposed machine combines axial magnetic bearing and motoring functionality into a single magnetic actuator, which not only spins the rotor-flywheel but also generates a levitation force to overcome the gravity. The mathematical model of the levitation...
A novel high speed flywheel energy storage system is presented in this paper. The rated power, maximum speed and energy stored are 4 kW, 60,000 rpm and 300 Whr respectively. High power density, energy density and efficiency can be obtained in this system with the compact design. In this design, the rotor with composite rim acts as the flywheel of the system and is sandwiched between two disk type...
This paper introduces the use of a three-phase matrix converter as an alternative to the DC-link back-to-back converter, for doubly-fed induction generator used in wind turbine system. A new dynamic model of matrix converter is proposed together with d-q dynamic representation of doubly fed induction generator. Consequently, the complicated three-phase coupling system is transformed into two independent...
This paper presents a current modulation scheme for matrix converter which serves as a power electronics interface in wound rotor induction generator based wind energy conversion system. It not only efficiently decouples active and reactive power of the generation system, but also gives a good grid connection performance. The proposed wind generation system is verified via simulation.
A flywheel cell intended for multi-flywheel cell based energy storage system is proposed. The flywheel can operate at very high speed in magnetic levitation under the supports of the integrated active magnetic bearing and a passive magnetic bearing set. 3D finite element analyses were applied to verify various configurations of passive magnetic bearing. The feasibility of PID controllers for the flywheel...
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