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For the comfort and security of users, noise of electric motors is a critical issue. The harmonic content of the magnetic pressure inside the air gap being the source of the sound radiated by the stator, it suits to know the impact of field weakening. We will show that for some load angles the pressure harmonics change so that the field weakening could be heard.
Critical wavelength concept is proposed in the paper in order to describe the different behaviors of eddy currents and different harmonic losses in solid poles or non-insulated laminated poles of electrical machines. The concept is developed from an eddy current model which is commonly used for the calculation of slotting effects in solid rotors. Two synchronous machines are used for illustrating...
The interior permanent-magnet (IPM) synchronous motor is characterized by a high rotor anisotropy. Such an anisotropy is the cause of a high harmonic content of the air-gap flux density distribution, almost independent of the main flux. As a consequence, there are fluctuations of the flux density in the stator iron and, consequently, eddy-current iron losses. This aspect is prominently evident during...
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 work presents an accurate and detailed analysis of the magnetic radial force density of a PM machine with 12-teeth/10-poles winding topology. The air-gap radial force density distribution of the studied PM machine, as function of angular position and corresponding space harmonics (modes) is analysed using a combination of finite elements (FE) and analytical methods. It is shown that, due to the...
In this paper the theory of the salient pole synchronous PM machines further is investigated and extended. Since the theory of this type of electric machines until now is based only on the idealized machines (with sinusoidally variation of the air-gap length), the main motivation of this work was to investigate the influence of the air-gap length (rotor permeance effect) on the performances of this...
In this paper, an axial-radial flux compound-structure permanent-magnet synchronous machine (CSPMSM) which consists of one axial-flux PMSM and one radial-flux PMSM is investigated. The purpose of this kind of machine is to keep the internal combustion engine (ICE) operating at maximum efficiency by harmonizing its two machines during all driving cycles in hybrid electric vehicle (HEV), and therewith...
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