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. 11, 1999
Filed:
Dec. 08, 1995
Matti Wahlstrom, Helsinki, FI;
Orion-Yhtyma Oy, Helsinki, FI;
Abstract
The present invention relates to a method and a circuit arrangement for controlling a stepper motor, e.g. in a panoramic X-ray apparatus. In the method of the invention, the control data of a processor (5) is first converted into an analog signal with a digital-analog converter (6), and the signal thus obtained is integrated with an integrating circuit (7,10), whereafter the signal is converted into pulses controlling the stepper motor (9) with a voltage-frequency converter (8). The circuit arrangement comprises preferably one or two integrators. In consequence, the changes in the speed of rotation of the stepper motor can be made stepless, whereby the stresses directed at the mobile parts are small, and mechanical oscillation caused by high momentary forces is avoided. In addition, the loading of the processor can be made uniform. Error correction circuits employing feedback are employed to enhance operation of the invention.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile