Control apparatus for linear motor, and linear motor apparatus

摘要

A control apparatus (10) includes a position detection unit (108) which detects a position of a mover of a linear motor (20) based on a change in an output signal from a magnetic sensor (27), a position control unit (102) which calculates a speed command value based on the position of the mover detected by the position detection unit (108) and a position command value of an external input, an estimation unit (150) which estimates a moving speed of the mover from a current value of a current flowing to a plurality of coils of the linear motor (20), a speed control unit (104) which calculates a current command value based on the speed command value and the estimated moving speed, and a power converter (106) which supplies power to the plurality of coils according to the current command value.

主权项

1. A control apparatus for a linear motor which includes a magnet unit which has a plurality of drive magnets in which N-poles and S-poles are alternately arranged in a row, and an armature which has a plurality of coils, and in which any one of the armature and the magnet unit is a mover, and the mover moves in an arrangement direction in which the drive magnets are arranged by a magnetic field generated by allowing a current to flow to the plurality of coils of the armature and a magnetic field generated by the plurality of drive magnets of the magnet unit, the control apparatus comprising:
a position detection unit which detects a position of the mover based on a change in a signal output from a magnetic sensor which the armature has, the magnetic sensor outputting the signal according to a direction of the magnetic field generated by the drive magnets; a position control unit which calculates a speed command value based on the position of the mover detected by the position detection unit and a position command value input from outside the control apparatus; an estimation unit which estimates a moving speed of the mover from a current value of the current flowing to the plurality of coils of the linear motor; a speed control unit which calculates a current command value based on the speed command value calculated by the position control unit and the moving speed of the mover estimated by the estimation unit; and a power converter which supplies power to the plurality of coils according to the current command value calculated by the speed control unit.