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In this paper, in order to replace a conventional electric linear actuator which is consist of rotary PM machine and ball screw, a novel double-sided five-phase modular linear permanent magnet synchronous machine (MLPMSM) is proposed and designed with the same volume. The basic structure of the machine is firstly described and the major dimensions of one module are then optimized to acquire the largest...
In order to reduce the permanent magnet (PM) volume and combine the advantages of in-wheel motor, a novel modular-stator outer-rotor flux-switching permanent-magnet motor (MSOR-FSPM) whose PM volume is half of that in conventional outer-rotor flux-switching permanent-magnet (COR-FSPM) motor is proposed. However, cogging torque and torque ripple of MSOR-FSPM motor are especially worse due to the inherent...
Ambisonics is a series of spatial sound reproduction system with flexible number of loudspeakers. Based on spatial harmonics decomposition and truncation at various orders, it aims at approximate reconstruction of target sound field within a certain region and below a certain frequency limit. The region and frequency limit are determined by spatial sampling theorem of sound field. The present work...
Ambisonics is a series of flexible spatial sound systems based on spatial harmonics decomposition of sound field. It is able to reconstruct sound field accurately within some region and below some frequency limit which are imposed by Shannon-Nyquist spatial sampling theorem and determined by the order of Ambisonics. Above the Shannon-Nyquist limit of spatial sampling, errors occur in the reconstructed...
A high precision selective harmonic compensation scheme for active power filters (APF), which was designed by using the basic theory of generalized predictive control (GPC), is proposed in this paper. A transfer function model -based GPC strategy is adopted. The strategy can compensate the delay in detecting the harmonic. And better result of compensation for harmonic can be achieved. As the Kalman...
It is a flexible and effective approach to emulate the behaviors of electric power system components using interconnected parallel power converters. The reduction of unnecessary circulating current is essential for the validity of the test-bed system. The types of the circulating current in the test bed system are discussed in this paper. The causes and the reduction strategies for the switching period...
Board level package reliability under mechanical shock has always been a great concern for mobile electronic products. As a result of “short to market” demand for new electronic products, a great effort has always been made towards developing more efficient methods for reliability assessments. This paper presents a board level mechanical reliability test method based on harmonic vibration. Numerical...
Turn-to-turn fault in the synchronous generator stator winding has been considered the most challenging one since the other types of stator winding related failures are usually the consequence of turn faults. In this paper we studied the turbo-generator in no load and load conditions and utilized the multi-loop method which can consider the asymmetric problem to detect the turn-to-turn fault of stator...
In order to improve the precision of the absolute photoelectrical encoder, a compensating method is put forward, which restrains the harmonics in moire fringe signal. After analyzing the relationship between the subdividing error and the sinusoidal index, a low-pass digital filter which can make the moire signal satisfy the need of 1024 subdivision is designed. Considering with the fundamental frequency...
This paper applies Boost Converter Control to the parallel operation of APF with multiple inverters. Master-slave control mode is adopted because of its prominent advantages on independent operation, redundancy control and cost-effectiveness. The malfunctioning of one APF will not influence the normal working of other APFs. In Boost Converter Control, the canceling of system harmonic current is equivalent...
The unbalanced and nonlinear loads could result in a significant neutral current in the three-phase four-wire distribution power system. This paper proposes a novel neutral line active power filter (APF) system based on the special connection of the transformers and single-phase inverter. The theory analysis and computer simulations show that: (a) control system would be easy to implement due to only...
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