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:
Apr. 28, 1998
Filed:
Nov. 04, 1996
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A chip device for positioning control and position recording of a servo motor. The chip device can be operated in two modes: a first mode, and a second mode. In the first mode, the chip device can perform step command conversion, position loop control, multiple shaft synchronization, and recording of the position of the motor shaft. The step command conversion utilizes a digital-differential analysis (DDA) method to convert the step waveform in the command signal into ramp waveform for smoothed control of the servo motor. The position loop control circuit compute for the error in position and then compensates the error to generate a 12-bit 2's complement output which is subsequently converted to analog signal used to drive the servo motor. The purpose of multiple shaft synchronization is to allow a plurality of servo motor to rotate in synchronization and accurately with the same increments. The recording of the position of the motor shaft is achieved by counting the number of pulses from a position encoder coupled to the servo motor. The chip device is fast in processing speed, small in size, and reliable in operation, and allows synchronization among a plurality of servo motors. Moreover, the chip device can be built with fewer components so that production cost can be reduced.