Recently, a high-temperature superconducting (HTS) generator module with brushless HTS exciter for large-scale wind turbines is suggested for improving the stability of the generator. The brushless HTS exciter is used for inducing the field current to the HTS module coil without power supply, current lead, and slip ring, and hence reduces total power loss. However, unbalanced field current may...
Although the high temperature superconducting (HTS) synchronous motors or generators has been proposed by lots of research groups, just a small number of them has been proposed a fully superconducting rotating machines with HTS conductors. One major reason for that will be AC loss problem caused by the alternating magnetic field applied to the armature windings. However, a fully HTS rotating...
Permanent magnet linear synchronous machines (PMLSMs) are able to provide thrust force directly to the load without mechanical gears and transmission; therefore, they have significant advantages over rotary machines, such as simplicity and high efficiency. Generally, PMLSM uses vertically magnetized permanent magnets (PMs). However, we proposed a PMLSM with horizontally magnetized PMs, which...
The steady, increase in the demand for linear electrical machines in applications such as industrial robotics, transportation, manufacturing, and electrical power generation has been witnessed in recent times. Linear synchronous machines can be particularly operated without converting rotary motion to linear motion and have significant advantages such as simplicity, efficiency, positioning...
This study considered the reduction of the detent force of a permanent magnet linear synchronous generator (PMLSG). In general, the PMLSG has a relatively large magnetic air gap. Consequently, in the design of the PMLSG, its structure can be composed of single-sided and double-sided structures. The double-sided structure can produce larger force. The PMLSG also has a slotted-type stator...
Brushless doubly-fed generator (BDFG) is particularly suitable for using in variable speed constant frequency wind power generation system due to its inherent characteristics. The two sets of stator windings with different numbers of magnetic poles are coupled by magnetic field modulation of a special rotor, so the rotor structure directly affects the performance of BDFG. The commonly used...
Compensated pulsed alternator (CPA) is a kind of device supplying power for pulsed equipment such as pulsed laser, accelerator and electromagnetic railgun. The most widely researched scheme of CPA is the air-core self-excitation one which is capable of supplying high current and power. But it needs a bulky capacitor to provide seeding current and a prime motor which complicates the power...
Fully superconducting machine is the one that can take the most advantages of superconducting materials with dramatically improving the magnetic loading and electrical loading at the same time. However, intense R&D effort is giving priority to partially superconducting machines not only for their lower manufacture difficulty but also higher feasibility compared to fully superconducting...
Brushless doubly fed generator (BDFG) has a broad application prospect in variable speed constant frequency offshore wind power generation system, in recent years, MW-class generators for offshore wind turbine has been becoming the hot-spot of research. Due to the large volume of MW-class generators, if the solid rotor is used, there will be some difficulties in the process of transportation...
Brushless doubly-fed generator (BDFG) has the advantages of reliable structure, easiness in implementing variable-speed constant-frequency, small converter capacity, and so on, which has a broad application prospect in large offshore wind power generation. There are two sets of windings with different pole numbers on the BDFG stator, which are respectively called the power winding for...
