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. 16, 2013
Filed:
Apr. 08, 2009
Daisuke Maeda, Hitachinaka, JP;
Kenji Sakurai, Hitachi, JP;
Hiroyuki Hasegawa, Hitachi, JP;
Hidefumi Shirahama, Hitachi, JP;
Mitsuhiro Mishima, Tokai, JP;
Daisuke Maeda, Hitachinaka, JP;
Kenji Sakurai, Hitachi, JP;
Hiroyuki Hasegawa, Hitachi, JP;
Hidefumi Shirahama, Hitachi, JP;
Mitsuhiro Mishima, Tokai, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Information & Control Solutions, Ltd., Ibaraki, JP;
Abstract
A synchronous motor including therein a three-phase inverter and position sensors, having a unit for calculating a digital input current value from the analog output of an input current detection circuit that detects the input current flowing into the DC input terminal of the three-phase inverter, and a digital feedback speed control unit for adjusting the amplitudes and frequency of the AC voltages outputted from the three-phase inverter in such a manner that the motor speed calculated by a motor speed calculation uniton the basis of the outputs of the position sensors approaches a speed command value received by a communication reception unit from outside the synchronous motor. The synchronous motor further includes therein a communication transmission unit for transmitting the input current value and the motor speed to outside the synchronous motor.