A Primary Permanent Magnet Type Field Modulated Linear Motor

Abstract

The invention discloses a primary permanent magnet type magnetic field modulation linear motor. The motor structure includes two primary and a secondary composed of magnetic modulation blocks. The upper primary structure is alternately distributed with armature slots and armature teeth, and the lower primary is evenly arranged. The permanent magnet is excited in the horizontal direction, the magnetization direction is the horizontal direction, and the N poles and S poles are arranged alternately. The lower primary part is provided with an auxiliary iron core structure, and the auxiliary teeth are evenly distributed on the structure, and each auxiliary tooth is connected by the auxiliary yoke. Connected, the auxiliary structure is directly connected with the silicon steel sheet between the permanent magnets, which can effectively reduce the difficulty of motor processing, and at the same time, the auxiliary teeth of the lower primary can guide the leakage magnetic flux to form an effective magnetic circuit, and the secondary and auxiliary teeth jointly modulate the magnetic field of the motor to realize The coordinated modulation effect can effectively improve the magnetic field modulation efficiency and torque performance of the motor, and has great application prospects.

Description

technical field [0001] The invention relates to the fields of electric engineering, motor design and control, and long-stroke electric motors, in particular to a technology for improving the performance of a primary permanent magnet type magnetic field modulation linear motor. Background technique [0002] Due to its simple structure, linear motors can be used as direct drive motors in long-stroke linear applications, and their huge application value has attracted more and more attention. The existing long-stroke linear applications mostly use asynchronous motors or induction motors. This type of motor is characterized by simple structure, convenient processing and low cost, but the disadvantage is that the power factor and efficiency are relatively low. The former requires an additional configuration of current Converters add cost, which wastes energy. Compared with asynchronous (induction) linear motors, permanent magnet linear motor direct drive has the advantages of sim...

AI Technical Summary

Problems solved by technology

However, since the permanent magnet and the armature winding do not move relative to each other, the fundamental wave of the motor cannot be used, resulting in a low thrust density of the primary permanent magnet linear motor. The introduction of magnetic field modulation can greatly improve the thrust density of the primary permanent magnet linear motor. It provides an important reference for the application of primary permanent magnet linear motors in the field of long strokes

[0003] Chinese invention patent CN201810231465.6 discloses a cogging type bilateral primary permanent magnet synchronous linear motor. In this structure, both the permanent magnet and the winding are placed in the primary part, and the permanent magnet is embedded in the primary iron core, which can be regarded as two magnetic fluxes. The motor structure formed by combining the switching linear motor, the armature winding does not pass through the permanent magnet and the end is very short, which is conducive to the improvement of the power density of the motor, but the motor is essentially a flux switching motor, and it also works by using the modulated magnetic field harmonics. However, because the modulation and amplification effect of the flux switching motor structure is not obvious, it has the problem of low thrust density.

[0004] Chinese invention patent CN201710233408.7 discloses a permanent magnet vernier linear motor with high power density. This structure puts permanent magnets and windings on the primary, while the secondary only has an iron core structure. It belongs to the primary permanent magnet linear motor structure and is suitable for long-term applications. At the same time, due to the use of the magnetic field modulation principle, the motor has a large thrust density; however, its single modulation path leads to large magnetic flux leakage and low power factor of the motor; in addition, due to the competition space between the permanent magnet and the winding The problem is that the magnetic load and electric load are contradictory and cannot give full play to the advantages of the motor

[0005] To sum up, although the current primary permanent magnet magnetic field modulation linear motor can meet the requirements of high thrust density, high power density and low cost required in the long-stroke field, such motors generally only exist in the existing technology. The single modulation path leads to problems such as large magnetic flux leakage of the motor, poor modulation effect, low power factor, and thrust density to be further improved. The existence of these problems greatly limits its application and promotion in the long-stroke field.

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