PI

United Kingdom
United Kingdom

Time filter

Source Type

Mahmoud Y.,Worcester Polytechnic Institute | El-Saadany E.F.,PI | El-Saadany E.F.,University of Waterloo
IEEE Transactions on Energy Conversion | Year: 2017

PV modules operating under partially shaded conditions exhibit multiple peaks in their output power curves, which cause the majority of the maximum power point tracking (MPPT) techniques to become trapped in a local power peak. This unfortunately leads to additional energy losses that could otherwise be harvested if the global maximum power peak (GMPP) were correctly tracked. The available MPPT methods that are able to track the GMPP require periodic scanning of the PV curve, which disturbs the operation of the system and causes energy losses. A new MPPT technique is proposed in this paper that is distinguished by its ability to find the GMPP without the need for periodic curve scanning. The proposed method utilizes the mathematical model of the PV module, as well as the irradiances received by its PV cells, to analytically calculate the location of the GMPP. The required irradiances are innovatively estimated using an image of the PV module captured by an optical camera. The proposed method is also combined with the perturb and observe method to compensate for errors in the model or irradiance estimation. Experimental verifications are conducted to validate the effectiveness of the proposed MPPT method under various shading scenarios. © 2016 IEEE.


News Article | May 19, 2017
Site: www.prweb.com

Precision positioning systems industry leader PI (Physik Instrumente) has released an elevated version of its ironless linear motor stage, LMS-180, which is well-suited for precision automation applications in industry and research that require highly accurate linear motion over long travel with high load capacity. High Speed, Precision, Load, and Durability The LMS-180 linear stage family is available with five travel ranges from 6” (155mm) to 20” (508mm). Equipped with an ironless electromagnetic linear motor, the LMS-180 delivers smooth motion with 15 nanometers resolution and repeatability down to 0.05 microns. When driven with the SMC Hydra closed-loop motion controller, a maximum velocity of 19.7”/second (500mm/sec) is reached. Highly accurate position feedback is provided by an integrated direct-measuring incremental linear encoder with sine/cosine output. Recirculating ball bearings provide high-load capacity of 250N (56lbs) and durability at demanding repetitive cycle rates with high speeds. Why Ironless Linear Motors? Ironless, non-cogging linear motors provide very smooth motion, and a high dynamic velocity range along with rapid acceleration. They are ideal for applications where high resolution and extremely constant velocity is required, such as in optics inspection, metrology, photonics, interferometry, and semiconductor test equipment. The frictionless, zero-wear motor drives are also popular in fast automation applications, where reliability and maximum uptime are crucial. Alternate Drive Options The LMS-180 stage is also available in a modified version (LS-180) with a ballscrew drive and rotary stepper and servo motor options. The LS-180 stage provides even higher load capacity of 1,000N (224lbs), as well as higher push/pull forces. It is mounting compatible to the LMS-180 for easy assembly of multi-axis systems. Standard and Custom PI has in-house engineered solutions with over 4 decades of experience working with customers to provide products that meet application demands, and can quickly modify existing product designs or provide a fully customized OEM part to fit the exact requirements of the application. About PI PI is a leading manufacturer of air bearing stages, piezoelectric solutions, precision motion control equipment, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


News Article | May 24, 2017
Site: www.prweb.com

Motion control and piezo systems expert PI (Physik Instrumente) introduces a new robust OEM walking motor drive, the N-331, with its configuration rooted in existing patented piezo actuator technology and a patented piezo stepping motion principle design. Based on the application of historically successful technology, the new design it is ideal for use in high-end applications that require extreme precision and durability. Unlike traditional electromagnetic motors, piezo motors do not create magnetic fields, nor are they influenced by magnetic or electric fields – a characteristics that is advantageous in applications from e-beam lithography to MRI technology. When large optics, detectors or camera set-ups in industrial applications need to be positioned with nanometer precision, it can be beneficial to cut the actuator power once the fine positioning process is complete. If a motor or actuator is dependent on a continuous current draw to hold a position, heat dissipation, electromagnetic fields and thermal effects may have negative influences on the performance of the system. PICMAWalk motors are self-clamping, i.e. at rest or in steady state mode, they automatically hold the position without any need for power. PI’s PICMAWalk piezo linear motor uses 8 PICMA® piezo actuators arranged in a V-shape similar to a classical V8 engine to achieve high push/pull and holding forces along with nanometer precision. The space-tested PICMA® actuators are highly reliable, providing 60N (13lbs) power-off holding force and 50N (11 lbs) push/pull force. The maximum velocity is specified at 15mm/sec (0.6 inch/sec) and loads up to 5kg (11lbs) can be positioned with nanometer precision. Open and Closed-Loop Designs The units are available with 3 standard travel ranges from 25 to 100mm in both open and closed-loop configurations. The closed-loop models incorporate a high-precision incremental encoder with nanometer resolution. The calculated piezo-mechanical resolution is better than 1/10 nanometer. For maximum precision and reliability, the piezo actuators are integrated in a solid-state flexure guiding system, free of stiction and friction. Flexure elements combine high stiffness and load capacity. They do not require maintenance or lubricants, are 100% vacuum compatible, function in a wide temperature range, and are intrinsically wear-free. Standard and Custom In addition to the standard models, custom designs for OEMs are available, facilitated by the modular design. About PI PI is a leading manufacturer of air bearing stages, piezoelectric solutions, precision motion control equipment, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


News Article | May 4, 2017
Site: www.prweb.com

Precision positioning systems industry leader PI (Physik Instrumente) has released a higher performance model of its successful Mercury Stepper Motion controller. Stepper motors take up discrete positions in a revolution of a constant distance. Typical commercial models provide 200 to 1000 full steps per revolution. Designed to deliver more than 2,000 times the basic motor resolution, the C-663.12 Mercury controller is the newest addition to PI’s suite of motion control solutions. Compact Motion Controller, A Complete Package, Daisy Chain for Multi-Axis Operation PI’s compact C-663.12 motion controller is designed for 2-phase stepper motors, in open-loop or closed-loop operation commanded by USB or RS-232. Up to 16 units can be combined via daisy chain to operate multi-axis motion systems. The Mercury controller includes a 48-V wide-range-input power supply, and all cables required for operation. Programmable digital and analog I/O lines and input lines for limit and reference point switches controlled via TTL signals are also integrated. Data Recorder, Auto-Calibration ID Chip, Quick Start Up, Comprehensive Software Package The C-663.12 is equipped with a data recorder for high speed tracing, ID chip compatibility for quick start-up and on-the-fly parameter changes, and exchange of system components without recalibration. The controllers are delivered with extensive software packages, including drivers for LabVIEW, as well as dynamic libraries for Windows and Linux. Standard and Custom Solutions PI has over 4 decades of experience providing in-house engineered precision motion control solutions, and can quickly modify existing product designs or provide a fully customized OEM part to fit the exact requirements of the customer’s application. About PI PI is a leading manufacturer of precision motion control equipment, air bearing stages, piezoelectric solutions, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


News Article | June 8, 2017
Site: www.prweb.com

Motion control and nanopositioning application solutions expert PI (Physik Instrumente) is celebrating a second consecutive year of recognition at the 2017 Motion and Control Industry (MCI) Awards, receiving finalist status last month for “Manufacturer of the Year” and “Contribution to Skills & Training” at the award ceremony held at the National Conference Centre, near Birmingham, UK. PI was awarded MCI’s 2016 “Manufacturer of the Year”, which recognizes both individuals and companies as the best of the best in the motion control industry. Commitment to Partnership and Training The continued recognition in the field of motion control is based on the company’s successful partnership approach of working closely with its customers to build long-term, trusted relationships that help customers realize the true potential of precision motion and control. Coupled with a commitment to empower customers thru free Lunch & Learn education sessions, PI earned the award status for professional training and skills development. Professor Steve Dixon from the Centre for Industrial Ultrasonics, Department of Physics and School of Engineering at the University of Warwick, commenting on a Lunch & Learn session, said: “…the talk was pitched in such a way that it was accessible to everyone… If only all high tech companies were so forward thinking and supportive of the field in which they work.” Standard and Custom PI has in-house engineered solutions with over 4 decades of experience working with customers to provide products that meet application demands, and can quickly modify existing product designs or provide a fully customized OEM part to fit the exact requirements of the application. Find the Solution to Your Application > About PI PI is a leading manufacturer of air bearing stages, piezoelectric solutions, precision motion control equipment, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


News Article | June 29, 2017
Site: www.prweb.com

As a leader in precision motion control solutions, PI (Physik Instrumente) introduces the A-60x MTT, stainless steel multi-axis top that combines with its offerings of PIglide rotary air bearing stages and platforms. Air-bearings have no rolling or sliding elements and deliver completely frictionless, non-contact motion, resulting in negligible hysteresis or reversal error, better geometric performance, and velocity stability, which are ideal prerequisites for high-end industrial inspection and manufacturing operations. Linear and Angular Adjustments Mounted to rotary air bearings to provide manual adjustments in X-Y-tip-tilt, the A-60x MTT enables the perfect alignment of a payload to the bearing’s axis of rotation. Constructed from durable, wear-resistant stainless-steel with table diameters from 75mm to 300mm and a clear aperture, this accessory is ideal for metrology, roundness measurement, and part gauging applications as passive rotary air bearings are designed for accuracy, precision, high stiffness, and ease of use, in any orientation, and are easily integrated with motors and encoders for complete positioning solutions. In-House Air Bearing Design and Manufacturing Experience PI designs and manufactures all air bearing products in the USA. PI’s engineering team has more than 200 man years of air bearing design experience. In addition to customized systems for OEMs, PI offers a substantial standard product line of air bearing stages that includes motorized and non-motorized, linear, rotary, spherical, X/XY, voice coil, compact, and large scale systems, as a complement to its comprehensive range of piezo nano positioning stages, traditional motorized positioners and hexapod 6-axis parallel positioning systems. The air bearing technology and engineered systems capabilities puts PI in the unique position to cover the whole motion range from finger-tip sized nano-positioners to large scale stages with long travel ranges, through a plethora of different drives and guiding systems that can be tailored to meet the needs of an OEM or customer. Standard and Custom PI has in-house engineered solutions with over 4 decades of experience working with customers to provide products that meet application demands, and can quickly modify existing product designs or provide a fully customized OEM part to fit the exact requirements of the application. About PI PI is a leading manufacturer of air bearing stages, piezoelectric solutions, precision motion control equipment, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology, and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


News Article | July 13, 2017
Site: www.prweb.com

Worldwide nanopositioning equipment leader PI (Physik Instrumente) has engineered and released two new compact multi-axis positioning stages based on low-profile parallel-kinematic motion devices. Driven by piezo ceramic motors, nanometer precision is achieved along with high stability based on low heat generation and a drift free auto-position-clamping feature. N-865 High End – Low Profile 6-Axis Motion Platform, 2 Nanometer Minimum Incremental Motion This high-end system is based on proprietary PiezoWalk® linear motor technology. It provides 2 nanometer minimum incremental motion in X, Y, Z with 0.2 microradian angular motion in Pitch, YAW, and Roll. The N-865 can support loads up to 15N. Integrated proprietary linear encoders measure the position with 0.5 nanometers resolution. Q-845 Compact 6-Axis Motion Platform, 6 Nanometer Minimum Incremental Motion The Q-845 is high performance, compact 6-axis system based on piezo inertia drives, providing minimum incremental motion as small as 6 nanometers. Integrated linear encoders measure the position with 1 nanometer resolution and provide feedback to the 6-axis controller. The Q-845 supports loads to 10 N and achieves velocities up to 5mm/sec. Virtual, Programmable Pivot Point Both 6-axis systems provide software programmable virtual pivot points – a decisive feature for alignment processes such as required in SiP and micro-optics applications. Standard and Custom PI has in-house engineered solutions with over 4 decades of experience working with customers to provide products that meet application demands, and can quickly modify existing product designs or provide a fully customized OEM part to fit the exact requirements of the application. About PI PI is a leading manufacturer of air bearing stages, piezoelectric solutions, precision motion control equipment, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


News Article | July 28, 2017
Site: www.prweb.com

Less than 1 year after breaking ground and laying the ceremonial cornerstone, precision motion and nanopositioning solutions leader PI (Physik Instrumente) announces the opening of its Technology Center, which included an inaugural ceremony attended by hundreds of guests. Housing additional 200 workplaces, as well as test and measurement laboratories, clean rooms and environmental chambers, and an auditorium for seminars and training events, the Center brings together PI’s development teams into one shared space to promote interdisciplinary exchange and collaboration in a creative workspace. PI’s precision motion and positioning solutions include multiple levels of integration, from individual nanopositioning components to complete custom engineered motion systems for precision industrial automation applications. Honoring company founder and President of PI by naming the auditorium after him, Dr. Karl Spanner explained, "We operate in a high-tech sector that has a profound effect on the future. There are no modern high-performance microchips being manufactured that PI is not involved in. Motion, positioning, measuring, and controlling with the highest accuracy will continue to be our objective in the future and the main reason why we made the decision to build the Technology Center”. Standard and Custom PI has in-house engineered solutions with over 4 decades of experience working with customers to provide products that meet application demands, and can quickly modify existing product designs or provide a fully customized OEM part to fit the exact requirements of the application. About PI PI is a leading manufacturer of air bearing stages, piezoelectric solutions, precision motion control equipment, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


News Article | July 7, 2017
Site: www.prweb.com

Motion and precision positioning systems expert PI (Physik Instrumente) issued a catalog on newly introduced precision motion solutions for photonics, robotics, microscopy, and highly accurate industrial automation applications at LASER World of PHOTONICS, held in Munich, Germany last month. The 80 page catalog covers products and custom engineered systems, including automated photonics alignment engines, linear motor stages, piezo actuators, air bearings, hexapod Stewart platforms, and high performance motion controllers. Creative application solutions complement the existing comprehensive portfolio of precision motion and positioning technologies, components, and systems. As the leading international conference and trade show for photonics, lasers, and precision optics since 1973, LASER engaged and educated more than 32,000 visitors. PI’s interactive product displays included laser micro-machining setups, 10-axis touch panel test systems, high-speed gantries, SiP alignment systems, high-speed direct drive stages, and parallel-kinematic machines. PI has in-house engineered solutions with over 4 decades of experience working with customers to provide products that meet application demands, and can quickly modify existing product designs or provide a fully customized OEM part to fit the exact requirements of the application. PI is a leading manufacturer of air bearing stages, piezoelectric solutions, precision motion control equipment, and hexapod parallel-kinematics for semiconductor applications, photonics, bio-nano-technology, and medical engineering. PI has been developing and manufacturing standard & custom precision products with piezoceramic and electromagnetic drives for 4 decades. The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research. The PI group employs more than 1,000 people worldwide in 15 subsidiaries and R&D / engineering centers on 3 continents.


Marygold S.J.,University of Cambridge | Leyland P.C.,University of Cambridge | Leyland P.C.,Brnikat Ltd. | Seal R.L.,University of Cambridge | And 43 more authors.
Nucleic Acids Research | Year: 2013

An accurate, comprehensive, non-redundant and up-to-date bibliography is a crucial component of any Model Organism Database (MOD). Principally, the bibliography provides a set of references that are specific to the field served by the MOD. Moreover, it serves as a backbone to which all curated biological data can be attributed. Here, we describe the organization and main features of the bibliography in FlyBase (flybase.org), the MOD for Drosophila melanogaster. We present an overview of the current content of the bibliography, the pipeline for identifying and adding new references, the presentation of data within Reference Reports and effective methods for searching and retrieving bibliographic data. We highlight recent improvements in these areas and describe the advantages of using the FlyBase bibliography over alternative literature resources. Although this article is focused on bibliographic data, many of the features and tools described are applicable to browsing and querying other datasets in FlyBase. © The Author(s) 2012.

Loading PI collaborators
Loading PI collaborators