CONTROLLER OF LINEAR MOTION DEVICE AND CONTROL METHOD OF THE SAME

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.

主权项

1. A controller of a linear motion device, the controller comprising:
the linear motion device having a magnet attached to a moving body; a driving coil disposed in a vicinity of the magnet of the linear motion device, the driving coil being configured to move the magnet; a magnetic field sensor configured to detect a magnetic field generated by the magnet and configured to output a detection position signal value corresponding to a value of a detected magnetic field; a calibration operation circuit configured to obtain a detection position operation signal value from a first position signal value corresponding to a first position of the linear motion device and a second position signal value corresponding to a second position of the linear motion device, based upon the detection position signal value from the magnetic field sensor; a device position instruction signal generation circuit configured to output a target position signal value to instruct a target position to which the linear motion device moves; an output driver configured to supply a driving current to the driving coil based upon the detection position operation signal value and the target position signal value; and a leak magnetic field correction circuit configured to correct a detection error of the magnetic field sensor due to a leak magnetic field of the driving coil based upon a difference between the detection position signal value when an electric power is not supplied to the driving coil and the detection position signal value when the electric power is not supplied to the driving coil.