Electromagnetic performance analysis of high harmonic dual flux modulated brushless dual mechanical port dual electric port machine
摘要
Brushless dual-port motors (BLDPMs) are rapidly developing in the fields of new energy vehicles, industrial robots, and renewable energy due in part to their advantages of compact structure, flexible control, high reliability, and redundant design. However, the BLDPM suffers from low torque density, high torque fluctuation, and low harmonic utilization. Therefore, this paper proposes a high harmonic dual flux modulated brushless dual mechanical-port dual electrical-port machine (HHDFM-BLDDM). The proposed motor consists of a stator, an excitation rotor, a modulated rotor, and a dual winding structure, which enhances harmonic utilization through the dual flux modulation effect, and the high harmonics enhance the field modulation effect, thus greatly increasing the torque density and reducing the torque fluctuation. Based on the magnetic field modulation principle, the structure and working principle of the motor are described, and a finite element model is established to analyze its performance. Results show that the no-load back EMF amplitude of the external modulating winding is increased to 18.7 V (67% compared with the radial excitation mode), the no-load back EMF amplitude of the internal modulating winding is increased to 86 V (83.4% compared with the radial excitation mode), and the no-load back EMF amplitude between the two sets of windings is increased by 83.4% compared with the radial excitation mode. In addition, the magnetic coupling coefficient between the two sets of windings is much lower than 2%, and the torque density of the tangential excitation type reaches 21.79 KN·m/m3, which is an improvement of nearly 136%. The significant advantages of high harmonics in realizing magnetic field decoupling and output characteristic optimization under the dual flux modulation mechanism are fully verified.