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:
Oct. 21, 2014
Filed:
Jun. 07, 2010
Masayoshi Suhama, Toyota, JP;
Kenji Yamada, Komaki, JP;
Tetsuhiro Itoh, Nagoya, JP;
Satoru Katoh, Nissin, JP;
Masayoshi Suhama, Toyota, JP;
Kenji Yamada, Komaki, JP;
Tetsuhiro Itoh, Nagoya, JP;
Satoru Katoh, Nissin, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A control device controls an inverter controlling an output of a motor by PWM control. The control device calculates a reference frequency based on a torque and a rotation speed of the motor, calculates a random coefficient using two data tables, and calculates, as a random frequency, a value obtained by adding, to a reference frequency, a value obtained by multiplying a prescribed width by the random coefficient. The control device calculates control limit lines based on the rotation speed of the motor, and corrects the random frequency so as to fall within a range that is higher than the control limit line and lower than the control limit line. The control device generates a carrier signal having a random frequency as a carrier frequency.