Analytical Algorithm for Optimal Design of Magnetic Permeability of Permanent Magnet Motor Sheath

Abstract

The invention discloses an analytical algorithm for optimization design of magnetic conductivity of a permanent-magnet-motor sheath. The analytical algorithm includes creating a permanent-magnet-motor equivalent model and a permanent-magnet-motor equivalent magnetic circuit, determining a magnetic leakage coefficient according to an undetermined coefficient by the iterative convergence method and calculating an induced electromotive force. Through the analytical algorithm and setting of corresponding variables, motors in different sizes can be analyzed rapidly, certain universality is realized during calculation and analysis, and analysis of electromagnetic fields is facilitated. According to the design method, the magnetic conductivity of the magnetic sheath is set as a variable, so that influences of the magnetic sheath on air gap fields and induced electromotive forces of the motors can be analyzed rapidly, and further optimization design of the magnetic conductivity of the sheath is performed.

Description

technical field [0001] The invention relates to a weak analysis algorithm for the optimal design of the magnetic permeability of a permanent magnet motor sheath. technical background [0002] Compared with electric excitation motors, permanent magnet motors, especially rare earth permanent magnet motors, have significant advantages such as simple structure, reliable operation, small size, light weight, low loss, and high efficiency; The scope is extremely wide, covering almost every field of aerospace, national defense, industrial and agricultural production and daily life. The surface-mounted magnet rotor structure permanent magnet motor has been widely used in permanent magnet synchronous motors due to its simple structure, low manufacturing cost, and small moment of inertia. In addition, the permanent magnet poles in the surface-mounted magnet rotor structure are easy to The optimal design is realized so that the air-gap flux density waveform of the motor can approach th...

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Problems solved by technology

[0004] However, in high-speed permanent magnet motors, the thickness of the sheath is generally large, which is more than several times the length of the air gap, causing the reluctance in the magnetic circuit of the motor to mainly concentrate at the sheath position, thus significantly reducing the excitation effect of the permanent magnet, while The use of a ferromagnetic sheath will make the permanent magnet magnetic flux close through the sheath, so in the design of high-speed permanent magnet motors, the thickness of the sheath and the selection of its electromagnetic characteristics are of great significance

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