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:
Jul. 08, 1986
Filed:
Apr. 02, 1985
John W Robertson, Jr, Willowick, OH (US);
Stuart B Siegel, Willoughby, OH (US);
The Babcock & Wilcox Company, New Orleans, LA (US);
Abstract
Programmed digital equipment is utilized to generate three-phase pulse width modulated waveforms that are used in controlling an induction motor. A microprocessor is programmed to initialize conditions in the system, to perform a main task including the storage of converted analog signal, the checking of limits of motor motion and information fed back from the motor concernings its position, and the ramping of frequencies to change the position of the motor. A memory is provided for the programming which memory also contains tables that correspond to 90.degree. of each desired wave form. A single 90.degree. segment of each wave form is needed to generate all parts of each of the three phases. An analog to digital converter is utilized to convert analog information concerning gain, set point, dead band and feedback signal into digital signals which are stored and processed by the microprocessor. Programmable timers are connected to the microprocessors for generating the wave forms and for supplying master timing and interrupt signals indicative of an undesirable condition in the motor control.