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This paper presents the design and analysis of a variable arc magnet array comprising two segments per pole for permanent magnet (PM) spherical motor. The harmonic model for radial air-gap flux density distribution is solved by magnetic scalar potential equation using spherical harmonic series and validated by finite-element method. After the influence of magnet array parameters on the fundamental...
A design concept of a Halbach array permanent magnet (PM) spherical motor is proposed in this paper. Based on spherical harmonic functions, the three dimensional (3-D) magnetic fields produced by ball-shaped Halbach array rotor and parallel-magnetization rotor are analyzed. The pole-arc coefficient concept for conventional magnet array spherical motor is developed. The optimum pole-arc coefficient...
Halbach array permanent magnet (PM) spherical motor offers a number of attractive features. This paper described the structure, working principle and analytical equations of magnetic field of the Halbach array PM. Based on the magnetic field distribution and three-dimensional (3-D) magnetic field measurement, a position identification method was present. The analysis results of the positioning process...
Halbach magnetized rotors are being developed for various application, since they offer a number of attractive features. For example, the Halbach array air gap field distribution is inherently sinusoidal; the magnets have a higher working point which can increase the power density; due to the self-shielding magnetization, rotor back-iron is not essential so that the mass and inertia can be reduced...
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