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Topic: Adjustable Speed Drive

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	Adjustable Speed Drive - Wikipedia, the free encyclopedia
		Adjustable speed drive (ASD) is one of the most general terms applied to equipment used to control the speed of machinery.
		An adjustable speed drive might consist of an electric motor and controller that is used to adjust the motor's operating speed.
		Speed is regulated by regulating the fluid flow with a valve or by changing the displacement of the pump or motor.
	en.wikipedia.org /wiki/Adjustable_Speed_Drive (1644 words)

	Variable Frequency Drive - Wikipedia, the free encyclopedia
		A Variable Frequency Drive (sometimes abbreviated VFD) is system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor.
		A variable frequency drive is a specific type of adjustable speed drive.
		Variable frequency drives operate under the principle that the synchronous speed of an AC motor is determined by the frequency of the AC supply and the number of poles in the stator winding, according to the relation:
	en.wikipedia.org /wiki/Variable_Frequency_Drive (1226 words)

	Find Adjustable Speed Drives, variable frequency drive, variable speed, motor speed control, variable speed motor, ... (Site not responding. Last check: 2007-09-18)
		Adjustable speed drives change the speed of a driven shaft to a speed selected by the operator.
		In a hydraulic drive there are two main methods of hydraulically varying the speed of the driven load when the driving motor is operating at a constant speed, fluid coupling and hydraulic pump and motor.
		An eddy current drive is an adjustable speed drives in which a constant speed AC motor drives a drum assembly.
	www.designinfo.com /LearnMore/Mechanical_Components/Power_Transmission/Adjustable_Speed_Drives (749 words)

	[No title]
		Adjustable Operating Speed -- Use of an adjustable speed AC drive enables optimizing of a process, making changes in a process, allows starting at reduced speed, and allows remote adjustment of speed by programmable controller or process controller.
		Adjustable Torque Limit -- Use of an adjustable speed AC drive can protect machinery from damage, and protect the process or product (because the amount of torque being applied by the motor to the load can be controlled accurately).
		Using a fixed speed motor would require some type of mechanical throttling device, such as a vane or damper; but the fact remains that the motor would still be running full load and full speed (full power).
	www.newequipment.com /casehistory/CH_11_04.asp (1122 words)

	Adjustable Speed Drives
		Adjustable Speed Drives are an advanced technology for the twenty-first century.
		Adjustable Speed Drives provide induction motors with electrical conditions that allow a motor shaft speed to be adjusted and reversed under precise control.
		Correctly specified, adjustable speed drives provide a means of energy efficient operation and a route to energy conservation.
	www.rglsolutions.com /Adjustable_Speed_Drives.htm (289 words)

	MagnaDrive - The MagnaDrive Adjustable Speed Drive
		The MagnaDrive Adjustable Speed Drive (ASD) is a breakthrough speed control technology designed to increase the efficiency of motor drive installations and reduce the initial cost, operating and maintenance expense of those installations.
		Ideally suited to pump, fan and blower applications, the MagnaDrive ASD brings not only the considerable benefit of speed control to industrial and commercial applications, but also the reliability and reduced maintenance costs that result from transferring torque from motors to driven equipment across an air gap without shaft-to-shaft physical connection.
		The MagnaDrive ASD is currently installed in pump, fan and blower applications, in pulp and paper manufacturing, water and wastewater treatment, raw material processing, irrigation, power generation, mining, food processing and HVAC systems.
	www.magnadrive.com /md_asd (183 words)

	About AC Drives
		More manufacturers are referring to their drive as an "adjustable speed AC drive".
		The main power components of an AC drive, have to be able to supply the required level of current and voltage in a form the motor can use.
		The paradox facing drive manufacturers today is that as they make their drives easier to use, the amount of training with which they must provide their users increases.
	www.drivesys.com /asdis.html (2071 words)

	[No title] (Site not responding. Last check: 2007-09-18)
		FIGURE 3 is an illustration of an adjustable speed drive system 10 with the addition of integrated ride-through circuit 50 in accordance with the teaching of the present invention.
		The adjustable speed drive of Claim 1, further comprising an IGBT diode operable to be reversed biased when the IGBT is on to protect the dc-link capacitor from short circuit.
		The adjustable speed drive of Claim 1, wherein the control unit has a second input coupled to the dc-link, the control unit operable to turn off the IGBT if the dc-link voltage exceeds a certain predetermined value.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=99/41830.990819&ELEMENT_SET=DECL (3277 words)

	EPE Association: EPE 2003 - Topic 09e: Adjustable Speed Drive Systems (Site not responding. Last check: 2007-09-18)
		In fact, in particular for high power drives, where the size of filter components is large, the Q-factor results to be, with good reason, comparatively high, and the Qfactor has a direct influence on the damping coefficient of the system.
		Drive performances, as far as torque production is concerned, have been tested using a dynamometer in a speed range up to 12000 rpm and compared with the torque produced with the usual constant Volt per Hertz (V/f) method.
		This new drive system offers an increasing performance regarding the dynamic of the control and the rotor losses, and at the same time the volume and costs of the filters and the overall system are reduced.
	www.epe-association.org /epe/documents.php?current=103 (3750 words)

	Adjustable Speed Drives - Application Information - DC Drives - Principles of Operation :: Joliet Technologies
		DC drives, because of their simplicity, ease of application, reliability and favorable cost have long been a backbone of industrial applications.
		A typical adjustable speed drive using a silicon controller rectifier (SCR) power conversion' section, common for this type unit, is shown in Figure 2.
		The effect is similar to a very high speed switch, capable of being turned on and "conducted" off at an infinite number of points within each half cycle.
	www.joliettech.com /dc_drives_principles_of_operatrion.htm (313 words)

	Harmonics, Triplen Harmonics, Adjustable Speed Drive, Power Quality (Site not responding. Last check: 2007-09-18)
		This means that when distorted voltage containing the 5th or 11th harmonic is applied to a 3-phase motor, it will attempt to drive the motor in reverse, creating a negative torque.
		6-Pulse adjustable speed drives are a major source of the 5th, 7th and 11th harmonics.
		12-Pulse drives are significantly more expensive, and are a source of the 11th and 13th harmonics, but through their design are able to eliminate the 5th and 7th.
	www.hersheyenergy.com /harmonics.html (504 words)

	MagnaDrive - The MagnaDrive Adjustable Speed Drive Installations
		MagnaDrive ASDs were installed on two motors driving vertical shaft pumps that ran in parallel pumping wastewater from the main pump station sump to a clarifier.
		The drives were chosen in preference to Variable Frequency Drives due to space limitations and higher costs associated with the VFDs.
		The drives maintain the same 4800 GPM flow to the clarifier while reducing energy demand from 142 to 62 kW, a savings of 80 kW.
	www.magnadrive.com /md_asd/cstudy_daishowa2.shtml (909 words)

	NEMA - Adjustable Speed Drive Systems
		Adjustable Speed Electrical Power Drive Systems, Part 1: General Requirements—Rating Specifications for Low Voltage Adjustable Speed D.C. Power...
		Adjustable Speed Electrical Power Drive Systems, Part 2: General Requirements--Rating Specifications for Low Voltage Adjustable Frequency A.C. Power D...
		Adjustable Speed Electrical Power Drive Systems: Part 4: General Requirements--Rating Specifications for A.C. Power Drive Systems Above 1000 V A.C. an...
	www.nema.org /prod/ind/auto/speeddrive (113 words)

	AC Tech adjustable speed drives, adjustable frequency drives, ASDs, or AFDs - Canadian and US distributors
		The MCH Series adjustable frequency drive is designed to control these applications by the most energy efficient means: direct motor control.
		As example, a 20 HP drive is required to power a 10 HP electric motor when the drive is connected to a single-phase source.
		Three-contactor drive bypass completely isolates the adjustable speed drive when operating the motor at full speed directly across the line.
	www.electram.com /ACTech_MCH_series.htm (430 words)

	EPE Association: EPE 2001 - Topic 06e: Adjustable Speed Drive Systems (Site not responding. Last check: 2007-09-18)
		Speeds and tension controls are designed and their performances are analyzed and compared with those obtained with a Flux Oriented Control (FOC).
		The modified structure of a signal adaptation mechanism with adjustable reference model of a plant and/or adjustable observer, which eliminates high frequency oscillation from the plant is described.
		With the proposed method, the enhanced speed control performance can be achieved and the speed response against the disturbance torque can be improved for the vector-controlled induction motor drive systems in which the bandwidth of the speed controller cannot be made large enough.
	www.epe-association.org /epe/documents.php?current=569 (2902 words)

	Note 36. Variable-Speed Motors and Drives (Site not responding. Last check: 2007-09-18)
		Their main limitation is the stepwise nature of the speed change, which usually imposes an efficiency penalty in the overall application.
		The drive, which is totally electronic, changes motor speed by changing the frequency of the current that is supplied to the motor.
		Variable-pulley drives are belt drives in which the effective diameter of one of the sheaves can be changed as the equipment is operating.
	www.energybooks.com /toc/toc1136.htm (756 words)

	ScholarsArchive@OSU: Item 1957/439
		Influence of adjustable speed drive on induction motor fault detection using stator current monitoring.
		The introduction of adjustable speed drives has improved the control and the efficiency of induction motors, however, this has changed the nature of motor faults and how they can be detected.
		Using an adjustable speed drive for controlling the motor while applying these fault detection techniques has been compared to the supply of the motor directly from the “mains” source and to a pure sinusoidal supply through a programmable source.
	hdl.handle.net /1957/439 (256 words)

	Control Engineering - ABB delivers world's largest adjustable-speed drive (Site not responding. Last check: 2007-09-18)
		ABB's 32 × 30 × 30 ft load-commutated inverter drive is nearly twice as big as any other drive in the world, and the 23 × 20 × 18 ft ac synchronous motor weighs 360 tons, not including coolers and accessories.
		The drive and motor are critical power/mechanical components turning the giant fan to create the tunnel's controlled, Mach-1-plus wind conditions, needed to test aircraft at transonic speeds.
		The drive can run at over 100 MW—well exceeding the previous record of 65 MW—and turn the wind tunnel's fan at 600 rpm, producing wind speeds up to 1.2 times the speed of sound or about 900 mph.
	www.manufacturing.net /ctl/article/CA189419 (439 words)

	NEMA - Application Guide for AC Adjustable Speed Drive Systems (Site not responding. Last check: 2007-09-18)
		This Guide is intended to assist users in the proper selection and application of AC adjustable speed drive systems.
		This Guide covers AC electrical drive systems, rated 600 volts or less, consisting of three-phase induction motors, voltage source pulse width modulated adjustable frequency controls, and associated components.
		The Guide addresses common issues that should be considered in the selection of drive system components and the installation and application of the drive system.
	www.nema.org /stds/acadjustable.cfm (279 words)

	Adjustable Speed Motor Drive - AC and DC Controllers (Site not responding. Last check: 2007-09-18)
		Shopping for an adjustable speed motor drive doesn’t have to be difficult.
		Driveswarehouse sells adjustable speed drives by manufacturers like Hitachi and Polyspede, and variable speed motors in 1/8 to 200 HP.
		You can order your adjustable speed motor drive by calling Driveswarehouse at 1-888-476-5944 or by using our convenient online ordering system.
	www.driveswarehouse.com /adjspeed.html (366 words)

	DUCKER Worldwide (Site not responding. Last check: 2007-09-18)
		This study represented the 14th year of our coverage of the motor and drives industry, and the latest report in the Adjustable Speed Drives series, which dates back to 1984.
		This study represented the 14th year of our coverage of the motor and drives industry, and the latest report in the Adjustable Speed Drives series, dating back to 1984.
		This study involved speaking with drive manufacturers in order to quantify and delineate the 1997 market for adjustable speed drives in North America.
	www.ducker.com /i_drive.htm (417 words)

	Adjustable Speed Pumps (Site not responding. Last check: 2007-09-18)
		The energy costs associated with operating any given centrifugal pump is proportional to the cube of the speed, hence, it becomes clear using a VSD is a better idea than running a pump at constant speed and throttling its throughput with a control valve.
		Most of the VSD manufacturers can supply their drives to fail at full or zero speed on loss of a control signal or for that matter on the loss of instrument air.
		Due to the time lag in changing a pump's speed some D may be required to properly tune the loop.
	www.motorcontrol.com /public/ASPumps.htm (2023 words)

	Adjustable Speed Drive Systems :: Joliet Technologies
		Adjustable Speed Drives, Electric Motor Drives, Electronic Motor Drives, AC Motor Controllers, AC Inverters and a few other names.
		A motor drive controls the speed, torque, direction and resulting horsepower of a motor.
		A DC drive typically controls a shunt wound DC motor, which has separate armature and field circuits.
	www.joliettech.com /asd.htm (286 words)

	Adjustable Speed Drives & Couplings
		Typically, when the MagnaDrive ASD is operating at full rated motor speed, the slip is between 1% and 4%.
		The output torque of a MagnaDrive ASD is always equal to the input torque.
		The ability of the ASD to transmit power or to control speed is not affected by minor angular or offset alignment between the motor and load.
	www.hughes-primeau.com /id18.htm (474 words)

	NEMA - Safety Standards for Construction and Guide for Selection, Installation, and Operation of Adjustable-Speed Drive ...
		Applies to all industrial equipment electrical components and wiring which are part of the electrical drive system, commencing at the point of connection of input power to these components.
		Applies to open or enclosed electrical equipment for use on circuits which operate from an alternating-current supply voltage of 600 volts or less.
		NEMA is the leading trade association in the U.S. representing the interests of electroindustry manufacturers of products used in the generation, transmission and distribution, control, and end-use of electricity.
	www.nema.org /stds/ics7-1.cfm (287 words)

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