The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform
Finbarr Moynihan - One of the best experts on this subject based on the ideXlab platform.
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Advances in Brushless Motor control
Proceedings of the 1997 American Control Conference (Cat. No.97CH36041), 1997Co-Authors: A Murray, Paul Kettle, Finbarr MoynihanAbstract:Brushless DC servoMotors have been replacing Brush type Motors in machine tool and robotics applications over the last number of years. The well known advantages of Brushless over Brush Motors include improved reliability, higher power to weight ratios, and an overall better dynamic performance. This paper briefly describes the evolution in the control of Brushless drive systems which has been driven by higher levels of integration and reductions in cost of the control electronics. The first electronically controlled DC Brush Motor systems used analog control circuits and thyristor power switches. The present day Brushless drives use high power transistor switches and a high speed microcontroller or a digital signal processor which implements digital control loops for the Motor position, velocity and current. This paper describes in some detail the hardware and software elements in some typical drive systems.
Yoshinobu Honkura - One of the best experts on this subject based on the ideXlab platform.
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4-pole alignment ring-shaped magnet for automobile dc Motor
INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference 2005., 2005Co-Authors: Hiroshi Matsuoka, Y. Hayashi, Hironari Mitarai, Kenji Noguchi, Yoshinobu HonkuraAbstract:Recently, high performance anisotropic NdFeB bonded magnets, named MAGFINE, were investigated for small Motors used in automobiles. This paper discusses the success in developing a new 4-pole dc Brush Motor using MAGFINE, with 50% weight and volume reduction while maintaining the same Motor characteristics as conventional Motors. The 4-pole alignment method makes it possible to mold a long ring-shaped magnet with high performance for use in automobile Motors. The Motor using the 4-pole alignment magnet has reduced cogging torque while maintaining high Motor performance. Therefore, the magnet with 4-pole alignment makes it possible to produce a high performance and small-sized dc Brush Motor for automobile applications with high cost performance.
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development of a dc Brush Motor with 50 weight and volume reduction using an nd fe b anisotropic bonded magnet
IEEE Transactions on Magnetics, 2003Co-Authors: Y. Hayashi, Hironari Mitarai, Yoshinobu HonkuraAbstract:There is a need to reduce the weight and size of dc Brush Motors for automobile use. In the current study, sintered ferrite magnets were replaced by Nd-Fe-B anisotropic bonded magnets in an effort to reduce the size and weight of the Motor. Finite-element analysis was carried out, and a four-pole anisotropic magnet was determined to be optimal. Based on these results, an actual 35-W Brush Motor for power automobile seats was test produced. A roughly 50% reduction of weight and volume was realized in this test-produced Motor, which also maintained the same torque as the currently used ferrite Motor.
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Development of a DC Brush Motor with 50% weight and volume reduction using an Nd-Fe-B anisotropic bonded magnet
IEEE Transactions on Magnetics, 2003Co-Authors: Y. Hayashi, Hironari Mitarai, Yoshinobu HonkuraAbstract:There is a need to reduce the weight and size of dc Brush Motors for automobile use. In the current study, sintered ferrite magnets were replaced by Nd-Fe-B anisotropic bonded magnets in an effort to reduce the size and weight of the Motor. Finite-element analysis was carried out, and a four-pole anisotropic magnet was determined to be optimal. Based on these results, an actual 35-W Brush Motor for power automobile seats was test produced. A roughly 50% reduction of weight and volume was realized in this test-produced Motor, which also maintained the same torque as the currently used ferrite Motor.
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Development of a DC Brush Motor with 50% weight reduction using magfine
Digest of INTERMAG 2003. International Magnetics Conference (Cat. No.03CH37401), 1Co-Authors: Yoshinobu Honkura, Hironari Mitarai, Y. HayashiAbstract:The paper studies the development of 50% lighter MAGFINE Motors compared to conventional sintered ferrite Motors. The B-H curve and magnetic properties of MAGFINE compared with sintered ferrite are also investigated.
A Murray - One of the best experts on this subject based on the ideXlab platform.
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Advances in Brushless Motor control
Proceedings of the 1997 American Control Conference (Cat. No.97CH36041), 1997Co-Authors: A Murray, Paul Kettle, Finbarr MoynihanAbstract:Brushless DC servoMotors have been replacing Brush type Motors in machine tool and robotics applications over the last number of years. The well known advantages of Brushless over Brush Motors include improved reliability, higher power to weight ratios, and an overall better dynamic performance. This paper briefly describes the evolution in the control of Brushless drive systems which has been driven by higher levels of integration and reductions in cost of the control electronics. The first electronically controlled DC Brush Motor systems used analog control circuits and thyristor power switches. The present day Brushless drives use high power transistor switches and a high speed microcontroller or a digital signal processor which implements digital control loops for the Motor position, velocity and current. This paper describes in some detail the hardware and software elements in some typical drive systems.
Soren Dinesen Ostergaard - One of the best experts on this subject based on the ideXlab platform.
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effect of enhanced hygiene on transmission of staphylococcus aureus streptococcus agalactiae and streptococcus dysgalactiae in dairy herds with automatic milking systems
Journal of Dairy Science, 2021Co-Authors: Alice P Skarbye, Martin Bjerring, M A Krogh, Matthew J Denwood, Soren Dinesen OstergaardAbstract:The objective of the study was to evaluate the effect of hygiene measures in automatic milking units on the transmission of 3 mastitis pathogens considered to be mainly or partly transmitted from cow to cow during milking events. Two studies were conducted as within-herd experimental trials in 2 Danish commercial dairy herds (A and B) with automatic milking systems. Interventions to enhance hygiene were implemented on the automatic milking units. The 2 studies evaluated separate interventions. In herd A, the hygiene interventions were manual wash with the Lely foam unit and adjustments on the Brush-mediated teat cleaning procedure. In herd B, the hygiene intervention included automatic disinfection spray on the upper surface of the Brush Motor and daily change of Brushes. Composite milk samples were collected longitudinally at 3- or 4-wk intervals from all lactating cows. Additional milk samples were taken from cows entering or leaving the study groups. Milk samples were analyzed with quantitative PCR. A hidden Markov model implemented within a Bayesian framework was used to estimate the transmission probability. For analysis, 701 samples from 156 cows were used for herd A, and 1,349 samples from 390 cows were used for herd B. In the intervention group in herd B, transmission of Streptococcus agalactiae was reduced to 19% (95% posterior credibility interval: 0.00-64%) of the transmission in the control group, whereas transmission of Streptococcus dysgalactiae was reduced to 17% (95% posterior credibility interval: 0.00-85%) of transmission in the control group. This suggests that automatic spray on the upper surface of the Brush Motor with disinfectant along with daily change of Brushes collectively reduced transmission of Strep. agalactiae and Strep. dysgalactiae. Results on Staphylococcus aureus in herd B and results on manual foam cleaning and Brush-mediated teat cleaning adjustments in herd A were inconclusive.
Gregory S Chirikjian - One of the best experts on this subject based on the ideXlab platform.
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towards cyclic fabrication systems for modular robotics and rapid manufacturing
Robotics: Science and Systems, 2009Co-Authors: Matthew S Moses, Hiroshi Yamaguchi, Gregory S ChirikjianAbstract:A cyclic fabrication system (CFS) is a network of materials, tools, and manufacturing processes that can produce all or most of its constituent components. This paper proposes an architecture for a robotic CFS based on modular components. The proposed system is intended to self-replicate via producing necessary components for replica devices. Some design challenges unique to self-replicating machines are discussed. Results from several proof-of-principle experiments are presented, including a manipulator designed to handle and assemble modules of the same type it is constructed from, a DC Brush Motor fabricated largely from raw materials, and basic manufacturing tools made with a simple CFS.
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Robotics: Science and Systems - Towards cyclic fabrication systems for modular robotics and rapid manufacturing
Robotics: Science and Systems V, 2009Co-Authors: Matthew S Moses, Hiroshi Yamaguchi, Gregory S ChirikjianAbstract:A cyclic fabrication system (CFS) is a network of materials, tools, and manufacturing processes that can produce all or most of its constituent components. This paper proposes an architecture for a robotic CFS based on modular components. The proposed system is intended to self-replicate via producing necessary components for replica devices. Some design challenges unique to self-replicating machines are discussed. Results from several proof-of-principle experiments are presented, including a manipulator designed to handle and assemble modules of the same type it is constructed from, a DC Brush Motor fabricated largely from raw materials, and basic manufacturing tools made with a simple CFS.
