Electromagnetic actuator for active vibration isolation platform of spacecraft

Abstract

The invention provides an electromagnetic actuator for an active vibration isolation platform of a spacecraft, which comprises a magnet yoke assembly fixedly connected with a load needing vibration isolation and a coil assembly fixedly connected with a vibration interference source, and is characterized in that the coil assembly is located in an air gap of the magnet yoke assembly; a plurality of groups of permanent magnets are adopted in the magnet yoke assembly to generate a plurality of air gaps, and a single-coil mode or a double-coil mode is adopted in the coil assembly, so that a single-degree-of-freedom mode or a double-degree-of-freedom mode of the electromagnetic actuator is realized. According to the electromagnetic actuator, forces in two directions can be concentrated together through the overlapped coils, and the structure is more simplified during multi-degree-of-freedom vibration isolation control; the utilization rate of the magnetic field can be improved by increasing the number of air gaps in each degree-of-freedom direction; meanwhile, the installation mode of the coil assembly is more flexible, and the single-degree-of-freedom or double-degree-of-freedom use mode of the electromagnetic actuator can be determined according to whether the middle partition plate is installed or not; the output direction of the coil can be changed by flexibly changing the winding direction of the coil.

Description

technical field [0001] The invention relates to the technical field of electromagnetic actuators, in particular to an electromagnetic actuator used for an active vibration isolation platform of a spacecraft. Background technique [0002] During the operation of the spacecraft in orbit, it will be subject to various disturbances, which will cause micro-vibration of the spacecraft structure, and then affect the performance of the spacecraft payload, and the requirements for the accuracy and stability of the spacecraft are getting higher and higher, so the micro-vibration of the spacecraft structure The requirements for active vibration isolation platforms are getting higher and higher. In recent years, non-contact vibration isolation configurations have been adopted for spacecraft working environments with extremely high vibration isolation requirements, such as space test benches, space cameras, or installations of major disturbance sources such as propellers and actuating wh...

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Problems solved by technology

[0003] However, for the electromagnetic actuator part, the traditional electromagnetic actuator only uses a set of magnets to generate a limited magnetic field strength, and the magnetic field will shift when facing the coil current, which will affect the control accuracy.

Moreover, traditional single-degree-of-freedom actuators can only control the output in a single-degree-of-freedom direction, and the structure is too cumbersome when faced with the high-degree-of-freedom vibration isolation requirements in space, which also increases the difficulty of the control system.

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