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:
Jun. 26, 1984
Filed:
Apr. 22, 1982
John W Robertson, Jr, Willowick, OH (US);
James M Smith, Eastlake, OH (US);
The Babcock & Wilcox Company, New Orleans, LA (US);
Abstract
A controller for an induction motor used as a servo positioner comprises a position control module including a microprocessor with memory for generating a plurality of pulse width modulated waveforms. The module includes an analog to digital converter for converting one of four analog signals into digital signals readable by the microprocessor. The analog signals correspond to a gain signal, a feedback signal, a set point signal and a dead band signal. The module also receives digital signals for programming purposes. The microprocessor is programmed to initialize conditions and convert the analog signals. The module is included in a three phase drive controller which has drivers connected to the module for receiving the waveforms and generating corresponding AC inputs to the three phase motor. An overcurrent detector is provided for sensing overcurrents in the AC signals and for generating an interrupt signal which is applied to the module for interrupting the function thereof. The module according to its programming can be placed in one of three modes for interface with a broad spectrum of automatic control systems. The modes include automatic-analog, automatic-pulse, and closed-contact controls.