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:
Jan. 01, 2013
Filed:
Dec. 11, 2009
Kazuaki Tobari, Hitachiota, JP;
Yasuo Notohara, Hitachiota, JP;
Wataru Hatsuse, Mito, JP;
Dongsheng LI, Hitachi, JP;
Kentaro Oi, Hitachinaka, JP;
Yuuji Funayama, Ohira, JP;
Kazuaki Tobari, Hitachiota, JP;
Yasuo Notohara, Hitachiota, JP;
Wataru Hatsuse, Mito, JP;
Dongsheng Li, Hitachi, JP;
Kentaro Oi, Hitachinaka, JP;
Yuuji Funayama, Ohira, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
The invention relates to a speed control method of a magnetic motor and is capable of providing a speed controller of the magnetic motor realizing highly stable, highly efficient and highly responsive control characteristics even around critical torque of the motor. When an excessive torque command value (or a q-axis commanded current value) greater than a torque maximum value (or a q-axis current) that can be outputted by the motor is required, an input of speed control is limited so that the q-axis commanded current value does not increase up to a limit value.