Rotor resonances of high-speed permanent magnet brushless machines [PDF]
IEMDC 2001. IEEE International Electric Machines and Drives Conference (Cat. No.01EX485), 2002 For high-speed machines, in particular, it is very important to accurately predict natural frequencies of the rotor at the design stage so as to minimize the likelihood of failure. Finite-element analysis and experimental measurements are used to establish the natural frequencies and modes of the rotor of a high-speed permanent-magnet brushless motor ...
Ede, J.D., Zhu, Z.Q., Howe, D.
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Sensorless flux-weakening control of permanent-magnet brushless machines using third harmonic back EMF [PDF]
IEEE Transactions on Industry Applications, 2004 The sensorless control of brushless machines by detecting the third harmonic back electromotive force is a relatively simple and potentially low-cost technique.
Howe, D., Shen, J.X., Zhu, Z.Q.
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Rotor Eddy-Current Loss in Permanent Magnet Brushless Machines [PDF]
IEEE Transactions on Magnetics, 2004 This paper presents an analysis of the rotor eddy-current loss in modular and conventional topologies of permanent magnet brushless machine. The loss is evaluated both analytically and by time-stepped finite-element analysis, and it is shown that it can be significant in both machine topologies.
Toda, H. +4 more
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Permanent-magnet brushless machines with unequal tooth widths and similar slot and pole numbers [PDF]
IEEE Transactions on Industry Applications, 2005 This paper presents a comparative study of three-phase permanent-magnet brushless machines in which the slot and pole numbers are similar, with reference to conventional brushless dc machines in which the ratio of the slot number to pole number is ...
Howe, D., Ishak, D., Zhu, Z.Q.
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Reduction of cogging torque in interior-magnet brushless machines [PDF]
IEEE Transactions on Magnetics, 2003 An investigation into the cogging torque in a four-pole interior-magnet brushless machines having either a six-slot stator and a short-pitched nonoverlapping winding or a 12-slot stator and a full-pitched overlapping winding is described. It is shown by finite-element analyses and measurements that, by appropriately defining the pole-arc to pole-pitch ...
Zhu, Z.Q. +3 more
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Improved analytical model for predicting the magnetic field distribution in brushless permanent-magnet machines [PDF]
IEEE Transactions on Magnetics, 2002 A general analytical technique predicts the magnetic field distribution in brushless permanent magnet machines equipped with surface-mounted magnets. It accounts for the effects of both the magnets and the stator windings.
Chan, C.C., Howe, D., Zhu, Z.Q.
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Control Strategies for Brushless Doubly Fed Reluctance Machines [PDF]
IEEJ Transactions on Industry Applications, 2001 Paper presents the development and results of comprehensive comparative analysis of different vector control strategies for performance optimisation of the BDFRM being considered as a viable cost-effective brushless alternative to traditional brush and less reliable solutions in applications with limited variable speed ranges (such as wind turbines ...
Jovanovic, Milutin, Betz, Robert
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Influence of pole-pair combinations on the characteristics of the brushless doubly fed induction generator [PDF]
, 2020 The brushless doubly fed induction generator (BDFIG) is an alternative to the doubly fed induction generator (DFIG), widely used in wind turbines which avoids the need for brush gear and slip rings.
Abdi Jalebi, Salman +4 more
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Comparison of Halbach magnetized brushless machines based on discrete magnet segments or a single ring magnet [PDF]
, 2002 This paper compares the air-gap field distribution, cogging torque, back-electromotive-force waveform, and efficiency of brushless machines having a Halbach magnetization produced by either discrete magnet segments or a single ring magnet.
Howe, D., Xia, Z.P., Zhu, Z.Q.
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Calculation of d- and q-axis inductances of PM brushless ac machines accounting for Skew [PDF]
, 2005 A hybrid two-dimensional (2-D) finite-element/analytical technique is described for predicting the d-axis and q-axis inductances of permanent magnet (PM) brushless ac machines, with due account for the influence of skew.
Chen, Y.S., Howe, D., Zhu, Z.Q.
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