High power density motive loop permanent magnetic linear electromotor

Abstract

The utility model discloses a moving coil permanent magnet linear motor having high power density. The utility model comprises a coil assembly, a coil assembly frame, an inner magnetic yoke, a permanent magnet, an outer magnetic yoke and other components; the coil assembly comprises a forward winding and a reverse winding; the coil assembly is fixed on the coil assembly frame, and is capable of making reciprocating linear motion in an air gap; the coil assembly frame is connected with the driven moving elements; the direction and the size of the current is regulated through an electric control system, and then the needed motion mode is realized. The permanent magnet group is arranged at one side or both sides of the coil assembly; the permanent magnet group alternately adopts permanent magnets with different magnetic directions along motion direction and forms a Halbach array. The utility model has the advantages that, the power density of the motor is improved obviously, which is 50% more than the power density of conventional linear motors; meanwhile, the utility model has better control characteristic. The utility model can be used as an executive element and applied to the situations where the volume and the mass of the linear motor need to be small, and the thrust and the accuracy of the linear motor need to be large; for example, the utility model can be applied to the electro-hydraulic proportional control field, the robot field or other fields.

Description

a technical field [0001] The invention relates to an electromagnetic linear actuator that can be used as an actuator in various automatic control systems and can also be used as a linear generator, especially a high power density moving coil permanent magnet linear motor. Two background technology [0002] Linear motor is a novel motor that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion device. It has the advantages of simple system structure, less wear, low noise, strong combination, and convenient maintenance. The types of rotary motors and linear motor technology almost have corresponding varieties. It can also be said that there are a wide range of categories and varieties, and its application range is constantly expanding. In some places where it can uniquely function, satisfactory results have been achieved. It can be seen from the product samples of relevant foreign companies and the relevant literature of...

AI Technical Summary

Problems solved by technology

This theory has been applied to motor design in recent years, but it has not been applied to moving coil permanent magnet linear motors.

In addition, under high power requirements, it is necessary to increase the coil current, which may cause a large armature reaction (especially when a single coil is used), which will cause magnetic field distortion, reduce the output power of the motor, and deteriorate the control characteristics.

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