Primary permanent magnet bilateral linear magnetic field modulation motor and low magnetic resistance design method thereof

Abstract

The invention discloses a primary permanent magnet bilateral linear magnetic field modulation motor and a low magnetic resistance design method thereof. The motor structure comprises two secondary poles which are only composed of salient pole teeth and a primary pole which is provided with permanent magnets and armature windings. The upper secondary salient pole teeth and the lower secondary salient pole teeth are arranged oppositely, the salient pole teeth play a role in modulating a magnetic field, and the surface-mounted permanent magnets with the same excitation directions are arranged atthe tooth crest of a primary single-side armature at intervals. Meanwhile, the permanent magnets at the two sides of the primary pole are staggered, a primary iron core adopts the modular design, andeach primary module is only composed of long-strip-shaped armature teeth. Semi-closed armature grooves or closed grooves are formed between every two adjacent modules, and the armature windings are arranged in the grooves, so that the machining difficulty of the motor can be effectively reduced. Meanwhile, with the arrangement design of the permanent magnets and the secondary modulation teeth, a magnetic flux path can be effectively simplified, the magnetic resistance on the magnetic flux path can be reduced, the magnetic field amplitude of the motor can be increased, the torque performance can be improved, and the application prospect is wider.

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 low-cost, high-performance primary permanent magnet bilateral linear magnetic field modulation motor and its low reluctance design method, which is suitable for rail transit and logistics transportation, etc. Linear motion occasions. 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 efficiency and thrust density are low. The former requires an additional configuration of current Converters add cost, which wastes energy. Compared wit...

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Problems solved by technology

In addition, the fundamental wave of the primary permanent magnet motor is a non-operating wave, which operates based on the principle of magnetic field modulation. Therefore, in order to significantly increase the thrust density of the primary permanent magnet linear motor, it is necessary to design a larger modulation ratio (the number of permanent magnet pole pairs and the number of winding pole pairs Ratio), which makes the number of pole pairs of the motor winding smaller, which means that the effective magnetic field harmonics need to form a longer flux path, resulting in an increase in the reluctance of the magnetic circuit and a decrease in the magnitude of the flux density. The existence of these problems is greatly limited Its application and promotion in the field of long stroke

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