Zero-position sensor for rotating mechanism

Abstract

The invention relates to a zero-position sensor for a rotating mechanism. Thezero-position sensor comprises a zero-position sensor rotor detection disc and a zero-position sensor stator assembly, the zero-position sensor rotor detection disc is arranged on a rotating part of a product and rotates coaxially with the rotating part, and the zero-position sensor stator assembly is arranged on a fixed part of the product and is coaxially arranged with the fixed part; the zero-position sensor stator assembly comprises a zero-position sensor stator mounting bracket, a + X-position photoelectric assembly stator component, a + Y-position photoelectric assembly stator component, a -X-position photoelectric assembly stator component and a -Y-position photoelectric assembly stator component; the + X-position photoelectric assembly stator component, the + Y-position photoelectric assembly stator component, the -X-position photoelectric assembly stator component and the -Y-position photoelectric assembly stator component are sequentially fixed on a zero-position sensor stator mounting bracket in an anticlockwise direction, and a 90-degree mechanical angle is formed between every two components. According to the invention, errors caused by translational motion of the rotating part relative to the rotating shaft in all directions can be compensated, and the sensor can be prevented from being damaged during movement.

Description

technical field [0001] The invention relates to a zero position sensor for a rotating mechanism, which is used for the zero position under the condition of large relative translation and swing between the detected rotating part and the fixed part. Background technique [0002] Remote sensing satellites with maglev rotation scanning and mosaic imaging can achieve ultra-wide and high-resolution imaging. The magnetic levitation rotary joint realizes the connection between the platform cabin and the load cabin, provides high-precision support and rotation control for the camera, and provides high-precision pointing measurement for the optical axis of the camera by detecting the zero position of the rotary joint. The zero position sensor is used to provide information when the load cabin and the platform cabin reach a 0-degree rotation angle. When the load cabin and the platform cabin are at a 0-degree rotation angle, the time information (star time) reaching 0 degrees is sent to...

AI Technical Summary

Problems solved by technology

The resolver has a solid structure, strong environmental adaptability and shock resistance, and can directly give the zero position signal of the rotor, and the accuracy can meet the general detection requirements. However, when the suspension joint is working, the large gap between the stator and the rotor The position change will cause the reduction of the resolver position demodulation accuracy, and it is difficult to meet the high-precision pointing requirements

Commonly used magnetic encoders are Hall sensors. Hall sensors can be divided into linear Hall sensors and switch Hall sensors. The change in magnetic field strength caused by the relative displacement between the stator and rotor will have a greater impact on the accuracy of the linear Hall sensor. error, and its error is difficult to compensate; the accuracy of the switch Hall sensor is low and cannot meet the requirements

The photoelectric encoder has high precision, from hundreds of lines / cycle to tens of thousands of lines / cycle, and still has high resolution at low speed, but in the case of relative displacement between the stator and the rotor, the photoelectric The encoder is not only difficult to meet the demodulation accuracy, but also is very likely to fail to receive normal photoelectric signals, and the glass photoelectric code disc has poor adaptability to the environment, low reliability, and is easily damaged under shock and vibration

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