Double-side staggered-tooth tau/2 low-thrust-ripple permanent magnet synchronous linear motor

Abstract

The invention discloses a double-side staggered-tooth tau/2 low-thrust-ripple permanent magnet synchronous linear motor. A first primary assembly and a second primary assembly are both composed of anarmature winding and a primary iron core, each primary iron core is of a tooth groove structure, and the armature windings are wound on teeth; the first primary assembly and the second primary assembly are located on the two sides of a secondary assembly and form air gaps with the secondary assembly respectively; the secondary assembly comprises a yoke plate and a plurality of permanent magnets, each pair of poles comprises four permanent magnets, the first permanent magnet and the second permanent magnet of each pair of poles are located on the same side of the yoke plate, the third permanentmagnet and the fourth permanent magnet of each pair of poles are located on the same side of the yoke plate, the positions of the first permanent magnets and the third permanent magnets are opposite,the positions of the second permanent magnets and the fourth permanent magnets are opposite, the magnetizing directions of the first permanent magnets and the third permanent magnets are the same, the magnetizing directions of the second permanent magnets and the fourth permanent magnets are the same, and the magnetizing directions of the first permanent magnets and the second permanent magnets are opposite; the displacement of the first primary assembly and the second primary assembly in the transverse direction is S which is equal to tau/2, and tau is the polar distance of the motor. By means of the structure, the thrust ripple of the motor can be reduced, and meanwhile unilateral magnetic tension and fluctuation of the unilateral magnetic tension are reduced.

Description

technical field [0001] The invention belongs to the field of motors, in particular to a permanent magnet synchronous linear motor with bilateral staggered teeth τ / 2 and low thrust fluctuation. Background technique [0002] When the processing technology and precision of double primary permanent magnet synchronous linear motor are guaranteed, the normal electromagnetic attraction formed between the primary and secondary can basically cancel each other out on the middle part, so that the normal force generated in the motor can be Distributed to the bearings on both sides, there is a strong guarantee for eliminating the influence of the normal force on the performance of the motor. And the motor with bilateral structure can provide greater thrust in a given volume, which is more suitable for occasions with high thrust density. However, due to the common influence of end effect, cogging effect and armature reaction, this type of motor has the disadvantage of large thrust fluctu...

AI Technical Summary

Problems solved by technology

But its disadvantage is that it reduces the average thrust of the motor, and at the same time changes the original characteristic that the secondary component bears the unilateral magnetic pull from the upper and lower primary components, which just completely cancels out, thus causing the secondary component to bear the unilateral magnetic pull and its fluctuations. Increase, which will affect the difficulty of motor assembly and affect the control accuracy of the linear motor system

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