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:
Jul. 04, 2017
Filed:
Aug. 10, 2012
Kazuaki Tobari, Tokyo, JP;
Kazuya Sekine, Kasumigaura, JP;
Kazuaki Tobari, Tokyo, JP;
Kazuya Sekine, Kasumigaura, JP;
HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo, JP;
Abstract
The controller estimates torque output by the motor and controls the current supplied to the motor in such a manner that a torque estimate of the motor obtained by the estimation corresponds to the torque command value. A torque estimation calculatorestimates the torque output by the motor. A phase error command calculatorcalculates a command value of a phase error from the deviation between the torque estimate and a torque command value. A speed estimation calculatoroutputs a speed estimate in such a manner that a phase error estimate corresponds to the command value of the phase error.