access icon free Magnetic field analysis and optimisation of permanent magnet machines with novel two-segment Halbach array

© The Institution of Engineering and Technology
Received 30/03/2018, Accepted 23/04/2019, Revised 29/03/2019, Published 24/04/2019

An analytical technique for predicting and optimising the open-circuit magnetic field in brushless surface-mounted permanent magnet (PM) machines with novel two-segment Halbach array has been presented. For the maximum fundamental air-gap flux density, the optimal magnetisation angle has been analytically derived. The effect of the rotor core on the fundamental air-gap flux density in the machine has been investigated. In addition, the proposed analytical technique can also predict the induced back-electromotive force and the electromagnetic torque. The analytical results show that the electromagnetic performance can be significantly improved for the proposed two-segment Halbach array compared with the conventional two-segment Halbach array. Predicted results have been validated by the finite-element analyses for 9-slot/8-pole slotless/slotted brushless PM machines.

Inspec keywords: permanent magnets; electric potential; finite element analysis; permanent magnet motors; rotors; magnetisation; brushless machines; permanent magnet machines; machine theory; torque; magnetic fields

Other keywords: brushless surface-mounted permanent magnet machines; optimisation; analytical results; brushless PM machines; open-circuit magnetic field; two-segment Halbach array; analytical technique; maximum fundamental air-gap flux density

Subjects: a.c. machines; d.c. machines; Finite element analysis; Magnetization curves, hysteresis, Barkhausen and related effects

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