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The Large current transformer (GTA)core of the work status will change as stray magnetic fields generated by external current, so that GTA generate additional errors, the accuracy decrease, and even lead to core of GTA saturation or failure.The paper based on the model of equivalent circuit and magnetic model, the error mechanism of external current infulence is analyzed, and the current transformer...
To equivalently test the shielding effect of heavy current transformer (HCT) with shielding coils in laboratory, an eccentric bus-bar testing method has been used to simultaneously simulate the effect of the primary bus-bar and adjacent bus-bar since 1970s. But still there hasn't been an effective way to determine the crucial parameters, especially the eccentric distance, which means the distance...
In order to reduce the interference from stray flux of adjacent bus bars on the error of heavy current transformer (HCT) which always has a large diameter, the interference mechanism was investigated theoretically in details based on magnetic circuit. It was concluded that there were mainly two interference ways that the stray flux affected the error of HCT, and then it was further verified by experiments...
The interest in multi-phase (number of phase higher than three) machines for high performance applications has been growing in recent years due to their potential advantages over three-phase machines. This paper presents an approach to implement sinusoidal pulse width modulation (SPWM) in a multi-phase inverter. A universal multi-phase voltage source inverter (VSI) is constructed, which is based on...
Two magnetic fields produce radial force on rotor when the difference of their pole pair numbers is 1. Based on this principle, this paper introduces the bearingless motor with a single set of 5-phase windings. The MMF waveform produced by multiphase windings is analyzed, based on which the winding configuration of 5-phase bearingless motor is introduced. The two needed magnetic fields are produced...
Conventional bearingless motor has two sets of 3-phase stator windings. The main winding is used to produce torque, while the suspension winding is utilized to produce radial force. This paper proposes a new multiphase bearingless machine with a single set of multiphase windings, taking advantage of the multiple control degrees of freedom in multiphase machine. Two groups of currents are fed to the...
Compared with their three-phase counterparts, multiphase machines with phase number n ges 5 have many advantages like lower torque pulsation, higher power density, better fault tolerance, etc. Due to these advantages and the increasing demands on high performance and high power adjustable speed drives, the research on multiphase drives has experienced a significant growth since the end of last century...
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