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This paper provides a comprehensive analysis of performance difference in the flux reversal permanent magnet (FRPM) machines with various magnet arrangements. The influence of different PM arrangements on working airgap flux density harmonics is firstly revealed. The torque variation against rotor pole number for four PM arrangements is then analyzed. Results show that each arrangement exhibits superiority...
Flux switching permanent magnet (FSPM) machines are innovative brushless machines that have magnets built into the stator instead of the rotor. Numerous studies were performed comparing the operational characteristics of FSPM machines with that of traditional PM machines as well as comparing the various design configurations of FSPM machines within themselves [1], [2]. The available literature is...
The stability of harmonic mode-locking in a two-section quantum dot passively mode-locked laser is examined using a Frequency Resolved Optical Gating pulse measurement system and shown for the first time to be a stable effect.
Harmonics have become an important concern in today's power system network. Conventional Inductive Voltage Transformers (IVT) are used as the essential instrument for harmonic measurement. However, the frequency bandwidths of the IVTs are limited. As a result, they are not suitable for high order harmonic measurement. This paper thus presents the testing and modelling of the frequency response of...
A new HVDC transmission system based on an inductive filtering method is presented in this paper, and then a unified equivalent circuit model and mathematical model are proposed for the calculation on the harmonic transfer characteristic of the new HVDC systems. Firstly, according to the topology of the new HVDC converter station, the equivalent circuit model, which is expressed by the fundamental...
The timing jitter performance of quantum dot passively mode-locked lasers at different harmonics is investigated. The corner frequency of the phase noise spectral density improves 20-fold under optical feedback stabilization.
A hybrid active power compensation device for current balance applied to electrical railway system is proposed. The device consists of inductive filter transformer, reversible single-phase PWM rectifier through a capacitor formed symmetrical structure are installed in two feeders of an impedance-matching balance transformer or a Scott wiring transformer. Inductive filter transformer can compensate...
The optical characterization and applications of quantum dot mode-locked lasers constructed using a reconfigurable, unit-cell approach are discussed including diverse waveform generation, optical to RF signal conversion, and optimal laser layout design.
Today's air conditioner applications demand a one-chip solution that simultaneously controls power-factor-correction (PFC) frond-end and two permanent magnetic (PM) motor sensorless drives, by using a single digital control IC. However, digital control has fundamental limitations that make most of conventional digital PFC control approaches unpractical. Implementation and integration of PFC control...
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