Conveyance device

Abstract

Provided is a conveyance device that conveys a conveyance object having a magnetic body, the conveyance device including: a plurality of coils configured to generate magnetic flux acting on the magnetic body; a coil driving unit configured to apply a voltage to each of the plurality of coils; and a calculation control unit including a current control unit and a position estimation unit. The current control unit determines the voltage. The position estimation unit estimates a position of the conveyance object based on a change in a current generated by applying a voltage pulse to the coils and switches, according to a position estimation value that indicates the position of the conveyance object estimated by the position estimation unit, between a speed control mode in which a speed of the conveyance object is controlled and a current control mode in which a current through the coils is controlled. Accordingly, in the conveyance device that has a function of estimating the position of the conveyance object based on information on the current flowing through winding wires of the coils, it is possible to implement stable conveyance speed control even in a section in which accuracy for estimating the position or speed of the conveyance object is low.

Dependencies are inferred from the claim text.