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:
Apr. 09, 2019
Filed:
Sep. 25, 2017
Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken, JP;
Hironori Hirata, Nagoya, JP;
BROTHER KOGYO KABUSHIKI KAISHA, Nagoya-shi, Aichi-Ken, JP;
Abstract
In a brushless motor apparatus, a brushless motor has a rotor and Y-connected coils, and a controller has an inverter circuit selectively driving the coils. The controller detects an induced voltage generated in a specific coil which is not driven by the inverter circuit while the rotor rotates. The controller acquires a positional signal of the rotor on a basis of a timing at which the induced voltage reaches the reference value. The timing is obtained through comparison between the detected induced voltage and a reference value. The controller switches a coil driven by the inverter circuit on a basis of the positional signal, and sets a mask period on a basis of a result of comparison between voltage of the specific coil and a coil other than the specific coil. The comparison between the induced voltage and the reference value is not executed in the mask period.