Magnetic field modulation permanent magnet linear motor capable of improving winding utilization rate and optimum design method thereof

Abstract

The invention discloses a magnetic field modulation permanent magnet linear motor capable of improving winding utilization rate and an optimization design method thereof, and belongs to the field of a permanent magnetism motor. The permanent magnet linear motor comprises a single primary side and double secondary sides. An air gap is arranged between the single primary side and each of the double secondary sides. The single primary side is formed by three unit modules. Each unit module is slotted in the sides close to the air gaps to form four primary teeth and two primary slots. The tooth end of each primary tooth is provided with a plurality of virtual slots and virtual teeth in the motor motion direction, wherein the number of the virtual teeth is larger by one than that of the virtual slots, and each virtual slot is embedded by a magnetic concentrating unit formed by three permanent magnets. Three phases of windings in the primary slots are wounded on yoke portions of the three primary unit modules respectively; and each phase of winding can cut magnetic force lines generated by the permanent magnets on the four primary teeth in the corresponding module simultaneously. The permanent magnet linear motor improves winding utilization rate, reduces half of the winding use amount and reduces copper consumption under the condition of ensuring that performance indexes of no-load counter potential, thrust output, permanent magnet use amount and fault-tolerant capability and the like are not influenced.

Description

technical field [0001] The invention relates to a magnetic field modulation permanent magnet linear motor which improves the utilization rate of windings, and belongs to the field of permanent magnet motors. Background technique [0002] In the long-distance driving system of rail transit, linear motors have obvious advantages in terms of climbing ability, traction performance, engineering cost and vibration and noise. Among them, the primary permanent magnet linear motor adopts a short primary and long secondary structure, its windings and permanent magnets are placed on the primary, and the secondary has neither windings nor permanent magnets, and is only composed of magnetically permeable materials (such as carbon steel). The field of rail transit has a good application prospect. Although the primary permanent magnet linear motor has the advantages of high efficiency and low cost, its thrust density is lower than that of the traditional permanent magnet linear synchronou...

AI Technical Summary

Problems solved by technology

When concentrated winding is used, the end of the winding is short and the winding is convenient, but the winding coefficient of the motor is low, the utilization rate of the magnetic field is low, and the motor’s back EMF and thrust output capacity need to be improved; when distributed winding is used, the winding pitch is large and the end is long , the winding coefficient is high, the motor back EMF and thrust output are large

In these two motor structures, the permanent magnets and windings are closely arranged on the same side. During the long-term operation of the motor, copper loss, iron loss and eddy current loss will all be converted into heat. Once the heat dissipation is not timely, excessive temperature rise will cause The permanent magnets are permanently demagnetized, causing the motor to malfunction

Although the temperature rise of the windings and permanent magnets can be effectively reduced through water cooling in the motor casing cavity, the addition of the cooling system increases the volume and weight of the motor and reduces the overall thrust density of the motor

At the same time, the phase-to-phase coupling degree of the existing two types of motors is relatively high, and the fault-tolerant performance of the motor is poor. Motor efficiency and fault tolerance

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