Patent ID: 8643227
Filing Date: 2014-02-04
Classification: H02K,H02P

Abstract:
1. A linear motor comprising: a slider unit having a magnet row in which plural permanent magnets are arranged in series so that the same poles are opposed to each other and moving in an arrangement direction of the magnet row by electromagnetic force; a stator unit including electromagnetic coils for plural phases arranged along a movement direction of the slider unit and receiving supply of drive currents at different phases with respect to each phase; and plural magnetic detector devices that detect changes of magnetic flux with movement of the magnetic row for controlling movement of the slider unit, wherein the plural magnetic detector devices are provided in response to the phases of the electromagnetic coils for plural phases and arranged along the movement direction of the slider unit at an outer circumferential side of the electromagnetic coils for plural phases, and thereby, detect magnetic flux radially extending in a direction perpendicular to the arrangement direction of the permanent magnets at boundaries between the permanent magnets of the magnet row and output signal waveforms for plural phases at phases equal to phases of waveforms of back electromotive forces generated in the respective electromagnetic coils for plural phases when the magnet row moves.