A coreless axial flux motor

By distributing permanent magnet array magnetic steel groups on the stator windings to form a shielded magnetic field, the problems of high magnetic circuit impedance and reduced magnetic flux in traditional motors are solved, and the effect of improving the power density and efficiency of the motor is achieved, and the cost and The impact of mechanical vibration on the motor.

CN108123558BActive Publication Date: 2024-12-31SUZHOU INN MAG NEW ENERGY LTD
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Patent Information

Application Number
CN201711494888.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2017-12-31
Publication Date
2024-12-31
Estimated Expiration
2037-12-31

AI Technical Summary

Technical Problem

Due to the lack of ferromagnetic materials, traditional axial flux motors have increased magnetic resistance in the magnetic circuit, reduced magnetic flux, and low magnetic density in the air gap, which increases the design difficulty and material cost, and it is difficult to obtain high power density and excellent performance. .

Method used

Multiple groups of permanent magnet convergence structures are distributed on the stator windings, and permanent magnet array magnet steel groups are used to form shielded magnetic fields, so that the magnetic lines of force are closed along the minimum magnetic flux path, reducing the magnetic circuit impedance and leakage magnetic coefficient, and improving the motor power density and efficiency.

Benefits of technology

By adsorbing and repelling invalid magnetic lines, the effective magnetic flux is increased, the motor energy output and efficiency are improved, and the cost is reduced, while the motor mechanical strength and structural strength are improved.

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Abstract

The present invention relates to an iron-coreless axial flux motor, wherein the shell material is made of cast aluminum material, a cavity is provided in the shell, the stator includes a stator winding, the stator winding is formed by connecting multiple groups of coils in a ring shape, the coils are placed in virtual slots, and the stator winding is a concentrated winding; the rotor is a multi-pole rotor structure, and the rotor adopts rare earth nebium iron boron material 38uH; multiple groups of permanent magnetic magnetization structures are placed inside the shell, and the permanent magnetic magnetization structures are permanent magnetic array magnetic steel groups, and the permanent magnetic array magnetic steel groups form a permanent magnetic array above the stator winding, so that there is a shielding magnetic field above the stator winding, which prompts the magnetic lines of force in the entire magnetic circuit to be closed along the minimum magnetic flux path. The shielding magnetic field repels part of the originally invalid magnetic lines of force, thereby increasing the number of effective cutting magnetic lines of force, improving the magnetic flux per unit area in the electromechanical energy conversion process, and increasing the induced electromotive force according to the law of electromagnetic induction, thereby improving the energy output of the motor.
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