Articles About high speed
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Rolling element bearings are widely used in mechanical transmission to reduce friction between two rotating parts. With the further development of the electrical motor in mechanical industry, REBs operate more and more at high rotational speed. For these applications, REBs power losses can be predominant in mechanical transmissions.
The air-oil, two-phase flow inside the multiple-point, oil-jet lubrication ball bearing was studied based on CFD (computational fluid dynamics) theory and technique, and compared with single-point, oil-jet lubrication. The results indicate that the air-oil distribution inside the bearing with multiple-point, oil-jet lubrication is more uniform than single-point injection.
Passenger transport today moves significantly faster than ever before, often operating on separate tracks especially designed for high-speed trains. Accordingly, high-speed rolling bearings are very important components in the bogies of trains today. Maximum train speeds currently reach 380 km/h (236 mph) in the latest high-speed applications - 80% higher than in the earlier days of high-speed traffic. This paper presents two application examples of modern, high-speed traffic, together with some typical bearing arrangements and housings. It provides insight regarding measures taken in the bearing industry to meet the requirements of contemporary, high-speed traffic, and it cites important standards and regulations applicable for - but not restricted to - European applications. To be precise, the focus here is on journal bearings; information on traction motor bearings, transmission bearings and housings is included, but described in less detail.
In the process of applying industrial drive products, we occasionally are misled into believing that we are applying horsepower. The real driving force is not horsepower - it is torque. This paper is developed to impart a deeper understanding of torque, its relationship to horsepower, and the types of loads we most frequently encounter.
Synchronous motors controlled by variable speed drives are bringing higher efficiencies to industrial applications.
Dave Soma, the mechanical supervisor at Leland Olds Station, a coal-fired power plant near Stanton, North Dakota, says he and his maintenance team care deeply about keeping the plant running and providing people electricity, especially in the dead of winter.
This paper will look at the solutions that current drive and motor technology can offer in not only improving tension control but also solving several other issues that are inherent to systems with high ratio gearing.
Gear drives deliver power to industrial equipment such as bulk material conveyors, mixers, pumps and paper mills. The reliability that translates into greater uptime and profitability begins by specifying and selecting the proper drives for these critical applications.
A brief overview of the induction motor, including the basics of construction, performance and variable speed drives.
The changing landscape of hydraulic drives is leading many fluid power specialists to quickly adapt to using variable speed pump drives. Optimum utilization of these drives requires, in many cases, additional system design considerations.
Gear drives focus on longevity, quality and customization.
Health monitoring or condition monitoring has been used for many years on machines and in plants where the cost of an outage is high. It allows failures to be anticipated and maintenance or repairs to be scheduled for the least loss of production, as well as avoiding unnecessary periodic maintenance.
This issue we cover frame sizes and two-speed motors in our continuing series of articles, courtesy of Baldor Electric, dedicated to motor basics.
Implementing a power-on-demand concept based on variable speed drives allows for energy saving in any application that involves pumps or hydraulic systems. And when used in combination with an intelligent wiring and communication system, relevant machine data can also be easily recorded - the basis for comprehensive power management.
Slow speed operation of fan systems within the air handling industry is generally performed due to two reasons: a coast down operation is required for hot (induced draft) fans to cool down before shutdown (often by using a turning gear), and operational efficiency improvements can be achieved during non-peak periods by slow speed operation using a VFD. In either case, when these fans are supported by hydrodynamic bearings, it is the oil film thickness developed from the bearing-shaft interaction that limits the minimum speed that can be maintained without causing premature wear and bearing failure. This paper will present a brief overview of lubrication theory and critical design parameters to achieve slow speed operation.
Most manufacturers of shaft-mounted speed reducers offer torque arms for their products. However, in some situations, a machine designer may be required to design his own.
As the old adage goes, "There is more than one way to skin a cat." In the early stages of any project, system designers are faced with choices; whether they are designing a new application or retrofitting an old one, they need to determine what is the most efficient, economical and practical way of completing the task at hand. Though there are usually at least two viable means to accomplish the task, the first step is always to review and weigh the merits of each option.
Compact loaders are employed where large machines have no access or are over dimensioned. New hydrostatic drives from ZF meet the demanding needs of this market.
Smart actuators bring big benefits to utility and other off-highway vehicles
What did you learn in school today? This typical parental inquiry is met with several responses but rarely followed with, âœThe complete and total annihilation of robotic machines in a no-holds-barred death match.â
This case study presents how electronics and software can be applied to a mobile hydraulic application, as well as how electro-hydraulics have evolved over time.
With its labyrinth of cranes, cement mixers and Mack trucks, the entrance of CONEXPO-CON/AGG and IFPE 2008 looked more like a carnival than a trade show.
Hydrostatic drive concept gives LinsiTrak flexibility and versatility.
Todayâ™s competitive industrial gear marketplace demands products with excellent reliability, high capacity and low noise. Surface-hardened, ground tooth gearing predominates, but the legacy tooth forms handicap further improvements in capacity and noise generation. Vehicle and aircraft equipment use tooth forms not found in the standard tables to achieve better performance â” with little or no increase in cost. This paper will propose adopting these high-contact ratio forms to industrial use.
Our expert explores standard vs. optimized gears, as well as high contact ratio gearing.
Couplings and harsh environment use
This paper presents a joint project conducted by Ashwoods Electric Motors and Oerlikon Fairfield that uses planetary drives with an integrated electric motor. Current solutions used in production of off-highway vehicles rely upon large, heavy and inefficient brushed DC or induction motors, coupled to a planetary gearbox. This presents a number of challenges to the vehicle designers such as: limited vehicle range, limited space around the motor/drivetrain, and motor durability. The proposed integrated system utilizes an Oerlikon Fairfield Torque Hub, widely used in off-highway vehicles, and the Ashwoods first-to-market, interior permanent magnet motor. How these products are integrated, i.e. incorporating a brake solution, represents a market-changing product. Using interior permanent magnet (IPM) technology in the motor design means the motor can be up to 70% lighter, 70% smaller and 20% more efficient than traditional motors used in off-highway traction applications.
Richard (RJ) Seguin, CBS and technical sales representative at AMI Bearings, explains how his bearing expertise tripled the life of a customerâ™s bearings.
Brevini Power Transmission helps spectators enjoy stadium sights and sounds.
News Items About high speed
1 Maxon Motor and Gearhead Boast High Speed and Low Heat (August 1, 2014)
The new brushless drive with a diameter of 19 mm has been specially designed for high speeds and features low heat development and extrem...
2 Rotary Encoder Operates at High Speeds (April 15, 2010)
The MSR 40 is a modular steel tape rotary encoder from RSF Elektronik that measures applications with diameters of six inches (150 mm) to...
3 High Speed Ogura Mico Clutch Enhanced to Include Shaft (April 13, 2009)
Ogura has enhanced the Hi-Mic5 clutch to include a shaft designed to customer specifications. The electromagnetic clutch incorporates...
4 Zero-Max's Stress Resistant Couplings Operate at High Speeds (June 11, 2007)
Zero-Max CDÂ® couplings with aluminum hubs are designed for servo motor and other precision motion control applications. CD couplings comb...
5 Maxon Brushless Motors Offer Low Vibration at High Speeds (August 27, 2010)
Maxon's improved EC 22 motors are equipped with preloaded ball bearings and the latest generation of Neodymium permanent magnets. The...
6 Rigiflex Offers High Speeds, High Performance (December 18, 2012)
Rigiflex steel lamina couplings are used in all those applications which require a reliable and maintenance-free torque transmission wit...
7 Ruland Disc Couplings Built for High Accuracy, High Speed Systems (October 5, 2015)
Ruland recently started advertising their line of disc couplings. Disc couplings from Ruland are torsionally stiff, operate with zero-bac...
8 MotiCont Introduces High Speed, Zero Cogging DDLMs (November 19, 2014)
MotiCont, a manufacturer of motion control products, has introduced a new line of direct drive linear motors (DDLMs).MotiCont's&...
9 PI Offers High Speed Piezo Motion Stage (October 25, 2016)
The new P-616 NanoCube XYZ piezo scanner is a redesign of PI’s successful P-611, 3D positioning stage. Now based on a parallel...
10 Aerotech ACT Offers High Speed, High Acceleration (March 1, 2011)
The ACT by Aerotech is a high performance, cost-effective linear-servomotor-driven actuator that is faster and more accurate than a ...