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. 20, 2008
Filed:
Sep. 19, 2006
Mamoru Kubo, Isesaki, JP;
Kenji Nojima, Ota, JP;
Kazuhisa Otagaki, Gunma, JP;
Yoshio Tomigashi, Hirakata, JP;
Keiji Kishimoto, Hirakata, JP;
Mamoru Kubo, Isesaki, JP;
Kenji Nojima, Ota, JP;
Kazuhisa Otagaki, Gunma, JP;
Yoshio Tomigashi, Hirakata, JP;
Keiji Kishimoto, Hirakata, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An object is to provide a driving device capable of smoothly shifting from a starting state to a sensor-less vector control, in a case where the device drives a motor by the sensor-less vector control, and the device includes a voltage detecting circuit which detects an induced electromotive voltage of the motor. A control circuit starts the motor by rectangular wave control. A magnetic pole position of a rotor is detected based on an induced electromotive voltage of one remaining phase of the motor detected by the voltage detecting circuit. The control circuit controls a main inverter circuit based on the detected magnetic pole position, and accelerates the motor by the rectangular wave control. In a case where a predetermined shift revolution speed is reached, the control circuit shifts to vector control by the sensor-less in which the magnetic pole position detected during the rectangular wave control is used as an initial value.