Conveners
Wed-Mo-Po3.05 - Generators I
- Michael Green (LBNL)
- Timothy Coombs (University of Cambridge)
Since the rotor is supported by mechanical bearings, the mechanical friction and wear exist in the conventional wind turbine inevitably, which not only increase the starting wind speed and the maintenance cost, but also reduce the efficiency of power generation and the operation stability. In order to overcome these disadvantages, a magnetic suspension wind turbine (MSWT) is proposed....
A high-speed permanent magnet synchronous generator (PMSG) has been applied to a variety of industries due to its many advantages, as simple structure and high output density. However, since the required speed of the rotor is increased, the structure problem of the rotating machine is continuously caused due to the physical contact in the case of the conventional ball bearing.
In this study,...
Owing to their many advantages, such as high efficiency, high power density, simple mechanical construction, no excitation loss, and good reliability, high-speed permanent magnet synchronous generators (PMSGs) are gaining considerable attention from academia as well as industry worldwide. Because of the high-magnitude centrifugal forces that are exerted on the permanent magnets (PMs) in...
For permanent magnet (PM) linear generators to be applied to ocean wave energy converters, highly efficient energy conversion is important; however, for maximum power generation, wave motion variation must be treated in real time. Therefore, we propose a characteristic map of the generating performance, including characteristic results of power, losses, efficiency, force, and the power...
Recently, with the emergence of several global industries, linear oscillating actuators (LOAs) have been developed for various applications where short-stroke linear motion is required. In common LOAs, since electromagnetic losses are the parameters that determine the operating conditions and efficiency of most electrical machines, it is very important to accurately predict and reduce these...
With the power increasement of permanent magnet (PM) machines, the manufacture process and maintenance of irreversible demagnetization become increasingly difficult, which limits the magnetic field configuration design of large PM machines. Post-assembly magnetization method is the key to solve these problems and can improve the machine performance. One way is adding additional integrated...
The single-phase linear permanent magnet generator (SPLPMG), which is applied to the free piston Stirling engine (FPSE), has a simple structure and robust topology.
When a linear drive system such as a free piston Stirling engine is applied, a linear generator does not require a mechanical energy conversion device such as a screw or a crankshaft, and thus has a small mechanical loss and a...
Recently, eco-friendly vehicles such as pure electric vehicles (EVs), hybrid EVs and plug-in hybrid EVs (PHEVs) have been the subject of many studies in a dramatically accelerated effort to increase the total driving distance on a single charge. Among of PHEV components, increasing the efficiency of the engine generator system (EGS) is a key challenge in this effort. In the EGS, a generator...
A novel single phase tubular permanent magnet linear generator for Stirling engines is proposed in this paper. It has a bread type winding, which has no cutting. It comprises an outer-stator, an inner-stator and a mover, and they are mounted in a cylinder. The winding coils are wound in a ring shape and placed in the slot of the outer-stator. The inner-stator is made up of a ferromagnetic...
Rotational machine is a kind of promising high temperature superconducting (HTS) electrical application. Among them, the coated conductor HTS coils are most commonly used as DC magnets because the DC HTS coils in the rotor under the relatively stationary fundamental magnetic field does not cause AC loss. However, in actual operation, AC loss produced by the harmonic magnetic fields is...
