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:
Sep. 11, 2007
Filed:
Mar. 26, 2003
Michael Schmohl, Ammerbuch, DE;
Michael Schmohl, Ammerbuch, DE;
Metabowerke GmbH, Nuertingen, DE;
Abstract
The invention relates to an electric driven tool device, especially an electric hand-held tool device, comprising an asynchronous electric motor () or a brush-less synchronous electric motor and a computer-controlled motor control device (). The invention is characterized by a frequency converter () which can be controlled by the motor control device, whereby a motor (drive) voltage can be applied to the motor (), and with a current detector () which co-operates with the motor control device () and detects the motor current. The motor control device () is embodied in such a manner that, in a first phase of the motor operation, the frequency of the motor current is maintained in a constant manner up to a limiting current Iand, in a second phase of the motor operation, at loads above the load at which the motor current reaches the limiting current I, the frequency of the motor current is lowered in such a manner that the motor current is maintained at a constant value.