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US 2006/0138992 A1Published application
Motor controller and out of control detecting method
AssigneeKabushiki Kaisha Yaskawa Denki
InventorYoichi Yamamoto
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AssigneeKabushiki Kaisha Yaskawa Denki
InventorYoichi Yamamoto
Estimating the term…
A problem to be solved by the present invention is to provide a motor controller capable of enhancing the safety of a crane, or the like, by accurately detecting a control deviant state within a short period of time by means of simple computation using the amount of control of a motor. According to the present invention, a voltage and a current of an AC motor are controlled by subjecting the voltage and current to coordinate transformation along two axes “d” and “q,” and detects occurrence of a control deviant state from “d” and “q” components of the voltage or current. A control deviant state is determined to have arisen when a value—which is computed on the basis of θi=tan−1(Iq/Id) through use of an excitation current feedback value Id which is the “d” component of the electric current and the torque current feedback value Iq which is the q component—has attained a predetermined value or more.
A motor controller not using a speed sensor, such as a pulse encoder or the like, and having a control deviant sensor which controls a voltage and an electric current of an AC motor by subjecting said voltage and said current to coordinate transformation along two axes “d” and “q” and detects a control deviant state from said “d” and “q” components of said voltage or current, wherein
A motor controller not using a speed sensor, such as a pulse encoder or the like, and having a control deviant sensor which controls a voltage and an electric current of an AC motor by subjecting said voltage and said current to coordinate transformation along two axes “d” and “q” and detects a control deviant state from said “d” and “q” components of said voltage or current, wherein
A method for detecting control deviant state of a motor controller which controls a voltage and an electric current of an AC motor by subjecting said voltage and said current to coordinate transformation along two axes “d” and “q” and detects a control deviant state from said “d” and “q” components of said voltage or current, wherein
A method for detecting control deviant state of a motor controller which controls a voltage and an electric current of an AC motor by subjecting said voltage and said current to coordinate transformation along two axes “d” and “q” and detects a control deviant state from said “d” and “q” components of said voltage or current, wherein
Dependencies are inferred from the claim text.