ROTATION POSITION DETECTION DEVICE AND AIR CONDITIONER

摘要

A detector detects whether or not a first line induced voltage and a second line induced voltage match each other, the first line induced voltage being a potential difference of a first phase potential of phase potentials relative to a reference potential, and the second line induced voltage being a potential difference of a second phase potential of the phase potentials other than the first phase potential relative to the reference potential. The phase potentials is outputted by the armature due to an induced electromotive force. The reference potential is any one of a minimum phase and a maximum phase. A rotation-position setting unit sets, to a predetermined value, an estimation value of a rotation position of the motor 2 at a point in time when the first line induced voltage and the second line induced voltage match each other.

主权项

1. A device for detecting rotation position of a motor having a field including a permanent magnet, and an armature including coils of three or more phases, said field and said armature relatively rotating, comprising:
a detector that detects whether or not a first line induced voltage and a second line induced voltage match each other, said first line induced voltage being a potential difference of a first phase potential of phase potentials which said armature outputs due to an induced electromotive force relative to a reference potential, and the second line induced voltage being a potential difference of a second phase potential of said phase potentials other than said first phase potential relative to said reference potential, said reference potential being any one of a minimum phase and a maximum phase; and a rotation-position setting unit that sets, to a predetermined value, an estimation value of a rotation position of said motor at a point in time when said first line induced voltage and said second line induced voltage match each other.