Symmetrical permanent-magnet linear synchronous motor

Abstract

The invention discloses a symmetrical permanent-magnet linear synchronous motor. The motor comprises a rotor and a plurality of stator guide rails symmetrically arranged on both sides of the rotor, wherein the plurality of stator guide rails forms a movement track where the rotor moves; both sides of the bottom of the rotor are symmetrically provided with three groups of array permanent magnets respectively, each stator guide rail includes an U-shaped structure, and open ends of the U-shaped structures of the stator guide rails on both sides are oppositely arranged; the upper and lower positions of the open ends of the U-shaped structures are respectively fixed with a traction force coil, and a suspension force coil is fixedly installed inside the bottom of the U-shaped structure; the suspension force coil inside the bottom of the U-shaped structure interacts with the array permanent magnet at the corresponding position of the bottom of the rotor, and the traction force for upwardly suspending the rotor and the normal force are simultaneously generated; the suspension force coils on the stator guide rails symmetrically arranged on two sides of the rotor interact with the normal force generated by the array permanent magnet, so that the rotor of the linear motor always moves at the center of the guide rail.

Description

technical field [0001] The invention relates to a symmetrical permanent magnet synchronous linear motor. Background technique [0002] High-speed and high-precision linear motion is generally driven by linear motors, such as maglev trains, material conveyors, advanced machine tools, etc. In 1840, the British Whiston invented the world's first linear motor, but due to theoretical and technical defects, it was not until the middle of the 20th century that the linear motor entered a new stage of development. [0003] The linear motor servo system is a power device that directly converts electrical energy into mechanical energy for linear motion. It does not have an intermediate conversion link for a rotating motor, and can effectively overcome the traditional conversion mechanism's large volume, low precision, low efficiency, slow response, and loud noise. And many other shortcomings. The linear motor can be regarded as a rotary motor that is planed along the radial direction...

AI Technical Summary

Problems solved by technology

[0004] For many types of linear motors, the primary is only placed on one side. For such a structure of unilateral linear motors, the biggest feature is that there is a large normal suction between the primary and the primary, and the thrust is about About 10 times of that, which will lead to unstable operation of the unilateral linear motor

For most linear motors, the levitation force is the repulsion or suction force of the electromagnet: the repulsion-floating linear motor uses electromagnetic coils to induce mutual repulsion, and at the same time, it will generate eddy current effects, resulting in a large amount of heat generated by the system, which requires a cooling device. Due to the inability to accurately control the levitation force, the operation is unstable, and a strong magnetic field is also generated at the same time. The impact on the human body and other environments is not clear. The resistance of the linear motor is large when it accelerates, and it needs to provide auxiliary levitation force when it is stationary and accelerating. , need to add auxiliary current compensation circuit,

The suction-floating linear motor adopts a U-shaped structure, and the suspension height is very small. It has high requirements for the machining accuracy of the track and the decoration work. The mover must have an excitation power supply, resulting in a large and inconvenient running mover.

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