Abstract
Based on magnetic gear transmission principle, permanent magnet toroidal space motor for hybrid electric vehicles with dual-rotor drive is proposed in this paper, harmonic loss caused by toroidal space relative motion of two rotors is conducted in hybrid drive mode. According to the structural principle of toroidal space motor, the speed of permanent magnet teeth of planet and worm inner rotor are decomposed to the revolution and rotation planes respectively. On the two planes, the frequency of alternating magnetic field at toroidal stator, planet and worm inner rotor are derived. At iron core and permanent magnetic teeth of stator and rotor, the magnetic field of revolution and rotation components are simulated. Combining with the speed relationship of toroidal space motor, the harmonic losses of revolution component and rotation component are analyzed in hybrid drive mode. The influence of speed matching of two rotors and toroidal stator material on harmonic loss are discussed. The results indicate that harmonic loss of permanent magnet toroidal space motor for hybrid electric vehicles can be reduced effectively by reducing relative speed of two rotors and adopting amorphous alloy for toroidal stator.
Highlights
Due to the high efficiency and low emission characteristics, hybrid electric vehicles have attracted more and more attention in recent decades [1]–[4], and its hybrid power integrated system is one of the key components
A permanent magnet toroidal space motor for HEVs is proposed in this paper
The harmonic losses caused by two different motion components are analyzed by finite element simulation, and influences of speed matching and material on harmonic loss are discussed
Summary
Due to the high efficiency and low emission characteristics, hybrid electric vehicles have attracted more and more attention in recent decades [1]–[4], and its hybrid power integrated system is one of the key components. The relative motion of the permanent magnet teeth can generate an alternating magnetic field, which will causes harmonic loss in toroidal motor. In this paper, based on the working principle of the permanent magnet toroidal space motor for HEV, the speed of permanent magnet teeth on planet and worm inner rotor are analyzed on the plane of revolution and rotation. FREQUENCY AND AMPLITUDE ANALYSIS OF ALTERNATING MAGNETIC FIELD Based on the above speed analysis, it can be known that the permanent magnet teeth of dual-rotor have relative motion in both revolution and rotation planes. The relative motion of permanent magnet teeth generates an alternating magnetic field, which produces harmonic loss in permanent magnet toroidal space motor for HEV. The radial section of permanent magnet toroidal space motor for HEV is taken to analyze the harmonic loss caused by relative revolution motion. It can be seen from (4) and (6), the harmonic loss of permanent magnet toroidal space motor is related to the frequency of magnetic density fluctuation and amplitude of magnetic flux density
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