The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2012
Filed:
Jun. 24, 2009
Naoki Oomura, Shizuoka-ken, JP;
Naoki Oomura, Shizuoka-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A motor control unit or a semiconductor integrated circuit device for an air conditioner is provided. The motor control unit includes a current detector that detects a coil wound current of the permanent magnet motor; a coordinate transformer that transforms the coil wound current detected by the current detector into a d-axis current indicating a magnet flux component and a q-axis current indicating a torque component perpendicular to the magnet flux component; a position estimator that estimates a rotational position of the rotor based on an induced voltage of the permanent magnet motor; a current controller that calculates a command d-axis voltage based on a command d-axis current and the d-axis current detected by the current detector, and that calculates a command q-axis voltage based on a command q-axis current and the q-axis current detected by the current detector; an electrifier controller that electrifies the coil wound based on the command d-axis voltage and the command q-axis voltage; and a start-up controller that detects an oscillation of the rotor during a start-up operation and, if a velocity direction of the oscillation corresponds with a rotational direction of a forcible commutation, the start-up controller starts the forcible commutation so as to start an acceleration of the rotor by following an acceleration pattern.