A permanent magnet linear motor with asymmetric multi-harmonic excitation and its optimal setting method

Abstract

The invention discloses an asymmetrical multi-harmonic excitation permanent magnet linear motor and an optimal setting method thereof. Including the primary module and the secondary module, the secondary module remains fixed, the primary module is movable along the movement direction relative to the secondary module, the primary module has an air gap between the two secondary modules; the middle part of the primary iron core is the yoke, and the yoke There are semi-closed slots on both sides of the part, and the armature winding is wound on the yoke of the semi-closed slots; permanent magnet arrays are arranged on the outer end faces of the teeth on both sides of the primary iron core; two secondary modules are provided with teeth on the surface facing the primary module. Slots and tooth slots are arranged at intervals along the direction of motion. Under the same amount of permanent magnets, the present invention can generate harmonic magnetomotive force with twice the pole logarithm of higher amplitude, utilize the fundamental magnetomotive force and the second harmonic magnetomotive force in a balanced manner, and effectively improve the thrust density of the motor. Significantly reduce the no-load positioning force and load thrust fluctuations, effectively eliminate the normal force on the primary, reduce the difficulty of motor installation, and increase the motor slot full rate.

Description

technical field [0001] The invention belongs to a motor structure and an optimal setting method thereof in the technical field of linear motors, and particularly relates to an asymmetric multi-harmonic excitation permanent magnet linear motor and an optimal setting method thereof. Background technique [0002] Permanent magnet linear motors have the advantages of both permanent magnet motors and linear motors, and can directly convert electrical energy into mechanical energy of linear motion without the need for intermediate mechanical transmission parts. Therefore, permanent magnet linear motors have significant advantages such as high thrust density, high speed, high precision, and high efficiency, and have been widely used in high-end CNC machine tools, semiconductor processing, vertical lifting conveyor systems, and high-speed logistics systems. [0003] The working principle of a traditional permanent magnet linear motor is as follows: when the armature winding is fed w...

AI Technical Summary

Problems solved by technology

[0007] For example, the switching flux linkage type permanent magnet linear motor proposed in Chinese patents CN101355289B and CN108155775B, this topology clamps the permanent magnet in the middle of the armature iron core teeth, the permanent magnet consumption is small and the armature length is relatively short. The travel application can greatly reduce the cost, but it also brings new problems: (1) the armature core is composed of multiple discrete parts, which is difficult to process and install; (2) the slot area and the permanent magnet are mutually restricted, and the thrust density is limited Limitation; (3) The permanent magnet is surrounded by the armature winding, and the heat dissipation condition is poor

[0009] For example, the magnetic flux reversal type permanent magnet linear motor proposed by Chinese patent CN101552535B, this topology places the permanent magnet on the surface of the armature iron core teeth close to the air gap, the amount of permanent magnet is small and the length of the armature is relatively short. Long-stroke applications can greatly reduce the cost, but it also brings new problems: due to the series connection of the magnetic circuit, the armature magnetic circuit needs to pass through the permanent magnet, so that the equivalent air gap of the armature magnetic circuit becomes larger and the thrust density is limited

For primary excitation permanent magnet linear motors, which rely on effective harmonic magnetic fields to generate thrust, relying only on the fundamental wave and odd-numbered harmonic magnetomotive forces limits the further improvement of the thrust density of the motor

Images