CONTACTLESS DETECTION APPARATUS AND METHOD FOR DETECTING A ROTATION DIRECTION

摘要

A contactless detection apparatus has a first magnet ring, a second magnet ring, a first magnetic sensor, a second magnetic sensor and a controller. The two magnet rings are respectively mounted on two ends of a torsion shaft. When the torsion shaft rotates, the controller detects the magnetic fields of the two magnet rings through the two magnetic sensors. The controller calculates a twisting torque exerted on the torsion shaft and a rotational angle of the torsion shaft according to the detected magnetic fields at the same time. The detection apparatus of the invention has simple structure. The magnetic fields of both magnet rings do not interfere with each other, such that the detection result of the invention is accurate.

主权项

1. A method for detecting a rotation direction, comprising the steps of:
detecting a magnetic field generated from a first magnet ring mounted around a shaft unit by a first magnetic sensor; detecting a magnetic field generated from a second magnet ring mounted around the shaft unit by a second magnetic sensor, wherein the first magnet ring and the second magnet ring have different numbers of pairs of poles; receiving a first potential and a second potential from the first and second magnetic sensors respectively by a controller; calculating a rotational angle of the shaft unit according to the second potential by the controller; comparing the first potential with a reference potential to obtain a potential difference by the controller; checking a twisting torque exerted on the shaft unit according to the potential difference by using tables set up in the controller, wherein the tables include a twist angle table and a twisting torque table.