DEVICE AND METHOD FOR DETECTING ABSOLUTE MULTI-TURN ROTATION ANGLE

摘要

The invention provides a device and method for detecting an absolute multi-turn rotation angle. The device comprises a housing, a cover plate and a rotating shaft, the rotating shaft being placed go through the housing. The rotating shaft is fixed with a main gear, the main gear is meshed with driven gears having a teeth number smaller than that of the main gear, the driven gears comprise a large driven gear and a small driven gear, the main gear is externally meshed with the large driven gear, the driven gears are connected with a two-stage speed reduction device which enables the rotating shaft to rotate multiple circles to slow down to a circle-number gear and enables the circle-number gear to rotate one circle only, both the driven gears and the circle-number gear are provided with bearings, the bearings have magnets therein, and the two magnets are relatively fixed with the driven gears and the circle-number gear, respectively, the top edges of the bearings fit with a PCB board, angle sensing chips which are fixed on the PCB board are above the magnets, the angle sensing chips are apart from the upper surfaces of the magnets by a fixed distance, the cover plate is fixed on the housing, and the housing and the cover plate fix the position of the PCB board by means of fitting. By the device and the method, the solution of the detected rotation angels is high; in addition, the algorithm is simple, and the fault-proofing capability is high.

主权项

1. A device for detecting an absolute multi-turn rotation angle, comprising a housing, a cover plate and a rotating shaft, the rotating shaft being placed within the housing, characterized in that the rotating shaft is fixed with a main gear, the main gear is meshed with driven gears having a teeth number smaller than that of the main gear, the driven gears comprise a large driven gear and a small driven gear, the main gear is externally meshed with the large driven gear, the driven gears are connected with a two-stage speed reduction device which enables the rotating shaft to rotate multiple circles to slow down to a circle-number gear and enables the circle-number gear to rotate one circle only, both the driven gears and the circle-number gear are provided with bearings, the bearings have magnets therein, and the two magnets are relatively fixed with the driven gears and the circle-number gear, respectively, the top edges of the bearings fit with a PCB board, angle sensing chips which are fixed on the PCB board are above the magnets, the angle sensing chips are apart from the upper surfaces of the magnets by a fixed distance, the cover plate is fixed on the housing, and the housing and the cover plate fix the position of the PCB board by means of fitting.