U-shaped straight line servo motor

Abstract

The invention relates to a U shape linear servo motor comprising a stator, a mover, an installed platform and a coil winding. The stator comprises magnetic steels and a U shape base; the coil winding is inserted in the mover with the upper end connecting to the installed platform fixedly connected with a linear guideway while the other end clamped between the magnetic steels and forming an air gap with the magnetic steel. One group of the magnetic steels is formed by a monomer magnetic pole with an N pole and an S pole. Multiple groups of magnetic steels are symmetrically and parallelly arranged on both sides of the U shape base and U shape cavity along the mover axes and the magnetic polarity of the magnetic steels at the adjacent position is reverse. The linear servo motor has advantages of simple structure, good rigidity of the mover structure and high frequency stability, good heat dissipation performance of the whole machine and high unit power density, effectively weakens the motor cogging reluctance, improves the thrust stability during the whole machine running, solves the difficult problem puzzling the linear motor control technique development for a long time, realizes industrial production and effectively expands the application field of the linear motor.

Description

technical field [0001] The invention relates to the field of linear motors, in particular to a U-shaped linear servo motor, which is mainly used in the manufacture of permanent magnet linear motors and its servo control. Background technique [0002] With the development of precision manufacturing technology and numerical control technology, high speed, high efficiency and high precision have become the development direction of CNC machine tools. U-shaped linear servo motors are used in high precision machining due to their large stroke, high precision, high acceleration and large thrust. occupies a unique position. There is only one row of magnets in the distribution of traditional permanent magnet synchronous linear motors, and there is an edge effect caused by an open-circuit magnetic field. Improper design will generate a large edge force; at the same time, its pole pitch is relatively small, and each pole and each phase The number of slots q cannot be very large, other...

AI Technical Summary

Problems solved by technology

There is only one row of magnets in the distribution of traditional permanent magnet synchronous linear motors, and there is an edge effect caused by an open-circuit magnetic field. Improper design will generate a large edge force; at the same time, its pole pitch is relatively small, and each pole and each phase The number of slots q cannot be very large, otherwise the total number of slots on a pole pitch is large, making it difficult to manufacture

If q takes a small integer, the distributed winding cannot be fully used to weaken the harmonic component of the magnetic field, resulting in a large cogging force; in addition, there is a large normal suction force, which generates additional frictional resistance and reduces the smooth operation of the motor Sexuality, which seriously affects the control performance of this type of linear motor

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