A double-sided alternating-pole permanent magnet linear motor with secondary yokeless section

Abstract

The invention discloses a double-side alternating-pole permanent magnet linear motor with a secondary yokeless section, which comprises double primary winding, secondary winding and armature winding.The double primary winding is symmetrically arranged on both sides of the secondary winding, and an air gap is arranged between the primary winding and the secondary winding. The secondary winding comprises N2 'uniformly spaced secondary core blocks; Each primary winding has N1 'primary teeth, the top surface of each primary tooth faces the secondary tooth, the top surface of each primary tooth isprovided with n permanent magnet grooves, and the top surface between two adjacent permanent magnet grooves is formed as an iron core salient pole; A permanent magnet is nested in each permanent magnet slot, where n=1, 2, 3, 4 or 5; The magnetizing direction of permanent magnets on each primary tooth is the same; N1 primary teeth and N2 secondary salient poles constitute the basic unit of the motor, where N2=N1 x n + / - i, where i=1 or 2; N1 '>= N1, N2' >= N2. The invention is suitable for long-distance application, can further improve thrust density and utilization ratio of permanent magnet,and reduce cost.

Description

technical field [0001] The invention relates to the technical field of motor design, in particular to a double-sided alternating pole permanent magnet linear motor with no secondary yoke. Background technique [0002] In recent years, linear motors have been applied in various occasions such as rail transit and workshop transportation. Compared with the traditional rotary motor drive method, the use of linear motor drive saves the mechanical gear device that converts rotary motion into linear motion, thereby reducing the size, cost and mechanical noise of the drive system. [0003] Rare earth permanent magnet materials have been widely used in commercialized permanent magnet motors, which have the advantages of high power density, high efficiency and high power factor. Similarly, rare earth permanent magnet materials are also widely used in linear motors. [0004] Therefore, permanent magnet linear motors have the advantages of both permanent magnet motors and linear motor...

AI Technical Summary

Problems solved by technology

However, the space of its permanent magnet, primary iron core and armature winding is mutually restricted, which reduces the utilization rate of permanent magnet materials, as has been published in the article "Quantitative comparison of flux-switching permanent magnet motors with interior permanent magnet motor for EV HEV and PHEV applications"

[0007] The traditional primary surface-mount permanent magnet linear motor is unilateral, which makes the mover bear unbalanced magnetic pull, which not only affects the life of the bearing, but also increases vibration and noise

Moreover, the primary tooth surface of the traditional primary surface-mount permanent magnet linear motor is equipped with two permanent magnets with opposite polarities, and the edge flux leakage is large (low thrust density), which makes the permanent magnet utilization rate low

In addition, due to the existence of the secondary yoke, the cost and weight of the system are increased, such as figure 1 shown

Even if it is changed to a bilateral primary and secondary yokeless structure, such as Figure 7 As shown, it still faces the disadvantages of large edge flux leakage (low thrust density) and low utilization of permanent magnets

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