Permanent magnet brushless direct current linear motor with structure of rotor screw

Abstract

The invention provides a permanent magnet brushless direct current linear motor with a structure of a rotor screw, belonging to the technical field of direct current linear motors. A rotor consists of rotor magnetic steel and a rotor yoke, and the rotor magnetic steel is arranged on the exterior of the rotor yoke; and a stator consists of a stator punching sheet and a main case. The permanent magnet brushless direct current linear motor comprises a ball screw, a screw nut and supporting bearings, wherein a pair of supporting bearings are respectively arranged between the ball screw and the main case, the screw nut is fixed in the rotor yoke, and the ball screw is in threaded connection with the screw nut. The permanent magnet brushless direct current linear motor with the structure of the rotor screw, disclosed by the invention, has the advantages of compact structure, small volume, uniform air gaps and good heat dissipation effect, and quickness, sensitivity and freeness in starting and stopping, and is especially suitable for high-precision linear feed function locations of minitype machine tools or electric tools such as automatic drilling machines, electric screwdrivers and the like.

Description

technical field [0001] The invention relates to a permanent magnet brushless direct-current linear motor with a rotor lead screw structure, belonging to the technical field of linear motors. Background technique [0002] The existing linear motion motor technology needs to use a mechanical device to convert the rotary motion into a linear motion, which causes friction loss in the process, limits the stroke, and limits the development. Although the performance of the world's advanced AC and DC servo systems has been greatly improved, due to the limitation of the traditional mechanical structure feed transmission mode, it is difficult to break through and improve the relevant servo performance indicators. The linear motor direct drive mode cancels all intermediate transmission links between the source power and the worktable components, making the length of the machine tool feed transmission chain zero, so this transmission mode is also called "direct drive" or "zero transmiss...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing cylindrical linear motor is difficult to maintain uniform air gap, the edge effect caused by the beginning of the magnetic circuit, and the complex device easily leads to poor heat dissipation, and further provides a rotor screw permanent magnet brushless dc linear motor

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