Magnetic field modulation-type double-rotor motor by using Halbach permanent magnet array

Abstract

The invention provides a brushless double-rotor motor by using a Halbach permanent magnet array and a magnetic field modulation principle. The double-rotor motor comprises four layers which are an inner stator, a modulation ring rotor, an intermediate rotor and an outer stator in sequence from inside to outside in all; the inner stator, the modulation ring rotor and the intermediate rotor form an inner magnetic field modulation-type motor; the intermediate rotor and the outer stator form an outer permanent magnet synchronous motor; and the inner side and the outer side of the intermediate rotor are provided with Halbach array permanent magnets respectively. The modulation ring rotor is connected with an output shaft of an internal combustion engine; and the intermediate rotor is connected with the output shaft of the double-rotor motor. According to the double-rotor motor, the internal and external magnetic field coupling phenomenon of the double-rotor motor is reduced or even eliminated through the magnetic self-shielding characteristic of the Halbach array, the brushless target of the of an inner rotor of the double-rotor motor is achieved through a magnetic field modulation principle to improve the reliability of the motor, and the disadvantages caused by internal and external magnetic field coupling and a carbon brush slip ring are avoided.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motors, in particular to a brushless double-rotor motor using Halbach permanent magnet arrays and magnetic field modulation principles. Background technique [0002] With the increasingly tense global energy supply, the ups and downs of international crude oil prices, and the deterioration of the ecological environment, energy conservation and environmental protection have become global themes. Electric vehicles, hybrid vehicles and fuel cell vehicles continue to attract widespread attention from all over the world due to their energy-saving, low-carbon, and environmental-friendly features. Based on the existing technology, the hybrid electric vehicle combined with oil and electricity has been greatly developed as a transitional product. So far, the world's major automakers, including Toyota, General Motors, and Ford, have gradually perfected and matured their hybrid technology and rea...

AI Technical Summary

Problems solved by technology

[0004] At present, the world's research on dual-rotor motors is mainly focused on applying it as a power coupling device to hybrid vehicles, but the research is still in its infancy, a complete technical system has not yet been formed, and the poor performance of the prototype developed by the experiment cannot meet the actual needs application

Dual-rotor motors have problems such as low power density, large torque fluctuations, insufficient low-speed torque, and poor speed-up capability of weak magnetic fields. Moreover, the use of brush slip rings reduces the reliability of the motor. At the same time, the radial topology The structure leads to complex electromagnetic coupling phenomena, which increases the difficulty of controlling the dual-rotor motor

Chinese patent CN104377917A proposes an electromagnetic planetary gear power divider based on the principle of magnetic field modulation. This device realizes the brushless dual-rotor motor through magnetic field modulation, and realizes the anisotropic arrangement of the magnetic field through the split structure to avoid the coupling between the internal and external magnetic fields. However, too large axial dimension is not conducive to the layout of the whole vehicle

Chinese patent CN105375714A integrates the internal and external motors in the radial direction, making the structure more compact, but it cannot solve the problem of magnetic field coupling. The coupling of internal and external magnetic fields is serious, which is not good for motor performance and control

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