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. 21, 2019
Filed:
May. 14, 2010
Chiaki Fujimoto, Tokyo, JP;
Masahiro Kimata, Tokyo, JP;
Chiaki Fujimoto, Tokyo, JP;
Masahiro Kimata, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
Disclosed is a brushless-motor drive apparatus provided with: a current detecting means () for detecting currents flowing through armature windings () during periods when switching elements (H,L) of a drive circuit are ON; a calculation processing means for comparing a target current value and the detected current value, and calculating voltage command values to be applied to the armature windings (); and a PWM driving means () for controlling the ON/OFF of the switching elements on the basis of the voltage command values. The calculation processing means is further provided with a current-detection possibility evaluating means for evaluating whether or not the currents flowing through the armature windings () can be detected, with the operating states of the switching elements of each of the phases, and when the current-detection possibility evaluating means evaluates that the currents cannot be detected, the calculation processing means obtains the voltage command values using the current values detected when the currents are able to be detected, and continues the motor drive.