Patents Assigned to RS Automation Co., Ltd.
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Patent number: 10302464Abstract: The optical encoder according to the present disclosure includes a light receiving part formed with a plurality of first patterns, and a scale formed with second patterns and moving relative to the light receiving part, where at least one of the first and second patterns is aligned at a same interval to remove harmonic waves.Type: GrantFiled: May 29, 2014Date of Patent: May 28, 2019Assignee: RS AUTOMATION CO., LTD.Inventor: Sang Hoon Lee
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Patent number: 9683871Abstract: Provided is an optical encoder, including: a light receiving unit; and a scale moving relatively to the light receiving unit and including a first track and a second track each having patterns intended for projecting light onto the light receiving unit, wherein the number of patterns of the first track is Ns*Nd+i (where, Ns and i are an integer of 1 or greater, and Nd is an integer of 2 or greater), and the number of patterns of the second track is (Ns?1)*Nd+i, so an absolute angle of the scale can be calculated in real time and in high resolution.Type: GrantFiled: May 29, 2014Date of Patent: June 20, 2017Assignee: RS AUTOMATION CO., LTD.Inventor: Sang Hoon Lee
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Patent number: 9541908Abstract: The present invention relates to a servo motor controller for controlling a servo motor having a current limiting unit, and a tuningless nonlinear control method thereof. According to the present invention, the servo motor controller control method for controlling a servo motor including a current limiting unit comprises the steps of: detecting that the limited current is output according to a current command of the current limiting unit; adjusting a disturbance estimation gain of the servo motor controller in response to the output of the limited current; and generating a control input provided from the servo motor controller to the current limiting unit on the basis of the adjusted disturbance estimation gain.Type: GrantFiled: April 22, 2014Date of Patent: January 10, 2017Assignees: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, RS AUTOMATION CO., LTD.Inventors: Dong Il Cho, Wook Bahn, Sang Hoon Lee
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Patent number: 9372100Abstract: This disclosure relates to a method for detecting an absolute rotation angle of an optical rotary encoder, and more particularly, to an optical encoder having a signal track for generating a digital pulse which may correct an error when a high-level bit is generated in a Vernier type. The optical encoder according to an embodiment of the present disclosure includes a master track for generating a sinusoidal signal with the fastest cycle, a Vernier track for generating a sinusoidal signal with a cycle smaller than that of the master track by a predetermined value, and a digital track for generating a digital pulse signal with a cycle proportional to the cycle of the sinusoidal signal of the master track.Type: GrantFiled: April 25, 2013Date of Patent: June 21, 2016Assignees: SNU R&D Foundation, RS Automation Co., Ltd.Inventors: Dong Il Cho, Wook Bahn, Tae Il Kim, Sang Hoon Lee
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Publication number: 20150171999Abstract: This disclosure relates to a method for detecting an absolute rotation angle of an optical rotary encoder, and more particularly, to an optical encoder having a signal track for generating a digital pulse which may correct an error when a high-level bit is generated in a Vernier type. The optical encoder according to an embodiment of the present disclosure includes a master track for generating a sinusoidal signal with the fastest cycle, a Vernier track for generating a sinusoidal signal with a cycle smaller than that of the master track by a predetermined value, and a digital track for generating a digital pulse signal with a cycle proportional to the cycle of the sinusoidal signal of the master track.Type: ApplicationFiled: April 25, 2013Publication date: June 18, 2015Applicant: RS AUTOMATION CO., LTD.Inventors: Dong Il Cho, Wook Bahn, Tae Il Kim, Sang Hoon Lee
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Publication number: 20140326862Abstract: The optical encoder according to the present disclosure includes a light receiving part formed with a plurality of first patterns, and a scale formed with second patterns and moving relative to the light receiving part, where at least one of the first and second patterns is aligned at a same interval to remove harmonic waves.Type: ApplicationFiled: May 29, 2014Publication date: November 6, 2014Applicant: RS Automation Co., Ltd.Inventor: Sang Hoon LEE
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Publication number: 20140326863Abstract: The optical encoder according to the present disclosure includes a light receiving part formed with a plurality of first patterns, and a scale formed with second patterns and moving relative to the light receiving part, wherein at least one of the first pattern and the second pattern is formed in a bent band shape to obtain an electric signal of reliable sinusoidal wave shape.Type: ApplicationFiled: May 29, 2014Publication date: November 6, 2014Applicant: RS Automation Co., Ltd.Inventors: In Kwang CHOI, Seung Chul LEE, Sang Hoon LEE, Hyun Jung KIM
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Publication number: 20140299755Abstract: Provided is an optical encoder, including: a light receiving unit; and a scale moving relatively to the light receiving unit and including a first track and a second track each having patterns intended for projecting light onto the light receiving unit, wherein the number of patterns of the first track is Ns*Nd+i (where, Ns and i are an integer of 1 or greater, and Nd is an integer of 2 or greater), and the number of patterns of the second track is (Ns?1)*Nd+i, so an absolute angle of the scale can be calculated in real time and in high resolution.Type: ApplicationFiled: May 29, 2014Publication date: October 9, 2014Applicant: RS Automation Co., Ltd.Inventor: Sang Hoon LEE