Patent ID: 8593093
Filing Date: 2013-11-26
Classification: H02P

Abstract:
1. An electric motor control apparatus comprising: a plurality of position sensors that detect magnetic pole positions of an electric motor; a position sensor failure determination unit that determines, based on each of position sensor signals from said plurality of position sensors, the failure of at least one of said plurality of position sensors thereby to generate a failure determination signal, and at the same time, generates a first phase based on each of said position sensor signals; a rotation speed calculation unit that calculates a rotation speed of said electric motor based on said failure determination signal and each of said position sensor signals; a phase command generation unit that generates a phase command based on said first phase, said failure determination signal and said rotation speed; an amplitude command generation unit that generates an amplitude command indicating a magnitude of a driving signal for said electric motor; and an electrical energization unit that generates said driving signal based on said phase command and said amplitude command, and applies it to said electric motor; wherein in cases where said failure determination signal indicates the failure of a part of said plurality of position sensors, said phase command generation unit calculates a second phase by the use of said first phase and said rotation speed, and generates said phase command by the use of said first phase and said second phase.