Linear rotating two-freedom-degree permanent magnet actuator of stator separation type

Abstract

The invention provides a linear rotating two-freedom-degree permanent magnet actuator of a stator separation type, and the actuator comprises an external stator, a rotor, and an internal stator. The internal and external stators respectively consist of three independent stator units with the same structure. Each independent external stator unit comprises six stator teeth, and is provided with an armature winding in a coiled manner. The rotor part is of a sandwich type cup-shaped structure, and a magnetic conductive iron core is of a segmented type structure, and is just formed by the overlapping of silicon steel plates. In order to improve the strength, an epoxy resin or carbon fiber sheath can be added outside the rotor. The internal rotor mainly consists of a stator core and a permanent magnet array, wherein the permanent magnet array is distributed in the peripheral and axial directions in a staggered manner, and each internal stator unit is provided with 24 permanent magnets. The actuator provided by the invention has the following advantages that (1), the actuator greatly reduces the inter-pole leaked magnetism, and remarkably increases the winding flux links; (2), the actuator avoids a conflict on an electromagnetic load space, and increases the power density; 3), the actuator reduces the demagnetizing risks of an armature field for permanent magnets, and improves the operation reliability.

Description

technical field [0001] The invention relates to a stator-separated linear rotary permanent magnet actuator, which is used in occasions where it is necessary to realize compound motion of linear and rotational two degrees of freedom. Background technique [0002] In industrial applications, the drive system is often required to achieve multi-degree-of-freedom movements. Linear and rotational two-degree-of-freedom motion, as a kind of multi-dimensional motion, has a wide range of application prospects, and can be used in high-precision machining, robots, electric vehicles, and electromagnetic gun launches. The traditional way to realize the two-degree-of-freedom motion of linear rotation is to combine two independent motors. However, this method has a complex transmission system, a large volume, and low transmission efficiency. In order to overcome the shortcomings of the traditional combined linear-rotary actuation system, some literatures have proposed a single actuator tha...

AI Technical Summary

Problems solved by technology

[0003] Technical problem: In order to overcome the shortcomings of low power density and low reliability of the existing linear rotary two-degree-of-freedom permanent magnet actuator, the present invention proposes a stator-separated linear rotary permanent magnet actuator to reduce magnetic flux leakage between poles , improve the air gap magnetic field distribution of the actuator, increase the power density, and reduce the risk of demagnetization of the permanent magnet by the armature magnetic field

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