| 摘要 |
The present disclosure relates to controllers of linear motion devices and control methods of the same, in particular, to a controller of a linear motion device and a control method of the same capable of controlling the position of the linear motion device accurately, in a case where a misalignment of the mounting position of a magnetic sensor or a magnetizing variation of a magnet occurs, or in a case where a magnetic field detected by the magnetic sensor receives an interference of the magnetic field generated by a driving coil of the linear motion device. A calibration operation circuit (24) has a period of stopping the electric power supply to a driving coil immediately before a detected magnetic field is obtained to prevent the influence of the leak magnetic field of the driving coil on a magnetic field sensor (21), and obtains a detection position operation signal value (VPROC) from a first position signal value (NEGCAL) corresponding to the home position and a second position signal value (POSCAL) corresponding to the full position of the linear motion device (31). A leak magnetic field correction circuit (34) is connected to a device position instruction signal generation circuit (26) and corrects a detection error of the magnetic field sensor by the leak magnetic field of a driving coil (29). |
