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This paper proposes a semi-flooded cooling concept for a high speed machine design. The electrical machine considered is for an aircraft starter-generator system where power density and efficiency are crucial. In order to achieve the high power density permanent magnet machine, a direct oil cooling strategy for the machine stator is adopted. A stator oil sleeve is designed to separate the machine...
A new advanced fault tolerant control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSIs). The proposed current control technique is firstly exploited to avoid the radial force appearance in case of open winding of one machine...
A new multiphase Surface Permanent Magnet (SPM) machine design is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSI). Stator segmentation between these sectors is analyzed to improve the machine performance and fault tolerant behaviour. A new adaptable control technique is developed for the different...
The radial force control technique for a triple three-phase Surface Permanent Magnet (SPM) machine is investigated in this paper. The machine has a nine-phase winding arranged in three sectors and supplied by three different Voltage Source Inverters (VSI). A machine model is developed, based on the multi space vector approach. The multi space vector current control technique is exploited to control...
This paper investigates detailed aspects involved in the electrical machine topology selection for high speed automotive superchargers, through a case study involving a 48V 15kW peak application. The transient nature of the application is taken into account together with the different cooling options available to the electrical machine within the vehicle.
In this paper the design aspects of an in-wheel electrical machine to be used for traction in electric buses are discussed. The main challenges with the application are the high torque density and cost-minimisation requirements. This paper looks at all the different design aspects of the traction motor required including the electromagnetic design optimisation and thermal management.
Synchronous Reluctance (SynRel) machines are considered a competitive alternative to the induction motors for variable speed drive applications due to their comparable performances and low cost. The absence of rare earth permanent magnets makes them very attractive also in the automotive sector especially for light electric vehicles. The design of SynRel machines has been formalized by many authors...
Salient-pole synchronous generators (SG) have a long history of utilization as reliable power generation systems. Important aspects of such generators include a high power-to-weight ratio, high efficiency and a low cost per kVA output [1]. Another critical aspect is the requirement for very low harmonic content in the output voltage. Hence, it is very important to be able to model and predict the...
The paper presents the design, analysis and testing aspects of high speed induction machines equipped with solid rotor. At first the theoretical background and design aspects of solid rotor for induction machines is presented considering electromagnetic, thermal and mechanical aspects and focusing on the assessment of end-region factor effects. The techniques are benchmarked against a 120 kW solid...
This paper presents the electromagnetic topology selection and thermal analysis of a liquid-cooled high speed surface-mount permanent magnet electrical synchronous machine (SM-PMSM), with a power density exceeding 30MW/m3 using thermal resistance networks. The parametric thermal models that have been developed cater for the axial temperature distribution in the machine while operating at speeds of...
The split ratio of several types of electrical machines has been identified as an important optimisation parameter. While the optimisation of split ratio in high-speed permanent magnet, switched reluctance and flux-switching machines has been researched, this parameter has often been neglected in the design of high-speed induction machines. In this paper, using a described multi-domain design environment...
With the recent introduction of more stringent grid codes, genset manufacturers have needed to reexamine the true stability limits for their products. This paper compares an approximate analytical method developed by Walker with Finite Element and direct measurement of the reluctance variation for a commercial synchronous generator. The tool described in the paper operates the synchronous generator...
This paper looks at the design of a high speed permanent magnet synchronous machine for maximum power density. Machines with sub-unity slots per pole per phase are characterised by low cogging torque, high slot fill and short end windings which contribute to lower copper losses. However such machine topologies tend to have a harmonic-rich armature reaction field which may contribute significantly...
This paper deals with the issues associated with the design of high-speed, high torque-density permanent magnet machines which operate in elevated temperature environments. The considerations discussed are described by the design cycle iterations of a 23 kW machine, which runs at a speed of 84 krpm, with a rated rotor torque density of 50 kNm/m3. Particular emphasis is made on the interaction (and...
This paper deals with the considerations associated with the design of high-speed, high torque-density induction machines, to be used in elevated temperature environments. The considerations discussed are described by the design cycle iterations of an actual 9.5 kW machine, which runs at speeds of up to 75 krpm, with a rated torque density of 44 kNm/m3. Particular emphasis is made on the interaction...
Cascaded doubly fed induction generator system is an important application in wind energy industry, and intrigue lots of research interests in recent years. Dynamic reluctance mesh modelling technique can model electrical machines with sufficient practical details thus it is an excellent and effective simulation tool for modelling such systems. This paper models the cascaded doubly fed induction machine...
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