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Topic: Rotational speed

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	Rotational speed differential responsive type control coupling with variable transfer torque control means - Patent ...
		By this action, the rotational speed differential responsive type control coupling "d" produces a transfer torque coincident with the target transfer torque by the effect of the rotational speed differential between the first and second rotary members "a" and "b" and the flow restriction by the orifice "c".
		A preferred embodiment of rotational speed differential responsive type control coupling is generally indicated by 20 and by way of example incorporated in a limited slip rear differential 1 for a rear-wheel drive vehicle to serve as a differential slip limiting device.
		In the meantime, a rotational speed differential responsive type control coupling is generally required to have a good responsiveness since a rotational speed differential first occurs and thereafter a transfer torque is caused.
	www.freepatentsonline.com /5194053.html (3560 words)

	Rotational speed - Wikipedia, the free encyclopedia
		Rotational speed is similar to angular speed but not the same.
		Rotational speed tells how many complete rotations there are per time unit whereas angular speed tells the change in angle per time unit, but the unit is the same.
		Rotational speed is not to be confused with tangential speed, despite some relation between the two concepts.
	en.wikipedia.org /wiki/Rotational_velocity (228 words)

	Resistor device for controlling a rotational speed of a motor - Patent 5550527
		A resistor device for controlling the rotational speed of a motor as defined in claim 1, wherein said open-circuit means includes a connecting piece connected to said resistance unit by at least two connecting points and a fuse spring having an elastic force connected to one of the connecting points and a connecting terminal.
		A resistor device for controlling the rotational speed of a motor as defined in claim 3, wherein said soldered portion of said open-circuit means is formed at a connecting point of said fuse spring and said connecting piece.
		The rotational speed of the motor varies with the selection of each step because the resistance value of the resistor piece 32 is set by lower value as it goes from the lower stage to the higher stage.
	www.freepatentsonline.com /5550527.html (1917 words)

	Effects of Flow Rate and Rotational Speed on Performance of Two Rotary Atomizers
		The two halves of the patterns were different and flow rate and rotational speed affected their shapes.
		A spray patternator was used to evaluate distribution patterns of the Air-cone and Micromax rotary atomizers.
		The atomizers were operated at combinations of three rotational speeds and three flow rates.
	www.astm.org /DIGITAL_LIBRARY/STP/PAGES/STP14155S.htm (212 words)

	Rotational Rates
		The rotational speed is 1 RPM for the entire wheel, but the linear speeds of different parts of the wheel depend on their distances (radii) from the center of the wheel.
		Substitute this in for the angle in the rearranged rotational speed equation.
		The angular speed of the car as it left the curve would be its final speed divided by the radius of the curve (notice that this is what we derived in Problem #1).
	webpages.charter.net /griche/pt/u3s1bprb.htm (1308 words)

	Rotational Motion
		Its magnitude is the angular speed, and its direction is the direction of the axis of rotation.
		The linear speed v of a point P, however, depends on its distance from the axis of rotation.
		The farther the bulk of the mass is from the axis of rotation, the greater is the
	electron9.phys.utk.edu /phys135d/modules/m8/rotation.htm (1683 words)

	Winder Winding Scheduling Equations
		It will be shown that, in certain applications, the motor need not be sized for maximum speed at core, but rather for the maximum rotational speed at the end of acceleration for winding applications, or the maximum rotational speed at the start of deceleration in unwinding applications.
		Eq (15) is used to calculate the maximum rotational speed of the motor as a function of the acceleration rate, and material thickness, for a given line speed and empty core roll radius.
		In applications that lack a clean (digital) motor speed reference that is calculated based on a master line speed reference and measured or estimated roll radius, the equations that model rotational motor speed can be used to provide a feed-forward reference to the algorithm that controls field weakening.
	www.apicsllc.com /apics/Ie_ias03/IAS4p5a.htm (1906 words)

	rotational power
		It seems that the ability to rotate the body at speed is a highly specific skill requiring specialist conditioning, and that being fast in a straight line is just not enough.
		Petranoff expands on this issue by emphasising the need for those performing rotational sports movements to develop an awareness of where their centre of gravity is – a requirement that could be compromised by constantly training at or beyond maximum performance velocities.
		Throws athletes and their coaches are well aware of this requirement and spend hours performing various rotations, with or without resistance/throwing implements, in the pursuit of better spatial awareness, body positioning and footwork.
	www.pponline.co.uk /encyc/rotational-power.html (1752 words)

	Rotational Sensors (Site not responding. Last check: 2007-11-05)
		rotational sensors to accurately move a robot from point to point.
		Participate in a teacher led discussion on what a rotational sensor measures and how rotational sensors can be used in conjunction with wait-for statements, program control loops, and rotational sensor conditional statements to control autonomous robots.
		Participate in a teacher led discussion on the use of rotational sensors to measure the speed of rotating axles using compound gear trains.
	www-education.rec.ri.cmu.edu /roboticscurriculum/rotationalsensors.htm (195 words)

	Changing Generator Rotational Speed
		The speed of a generator (or motor) which is directly connected to a three-phase grid is constant, and dictated by the frequency of the grid, as we learned on the previous page.
		The term "synchronous generator speed" thus refers to the speed of the generator when it is running synchronously with the grid frequency.
		It applies to all sorts of generators, however: In the case of asynchronous (induction) generators it is equivalent to the idle speed of the generator.
	www.windpower.org /en/tour/wtrb/genpoles.htm (336 words)

	Elementary ... (Site not responding. Last check: 2007-11-05)
		The linear speed of an object changes as it moves to different radii because the distance traveled around the circle changes.
		The linear speed is directly proportional to both the rotational speed and the radius.
		A measure of the rotational properties of the object’s motion.
	www.westtexas.tstc.edu /gened/PHYS_1305_LN_Ch8.htm (740 words)

	HDD Rotational Speed
		Imagine a record rotating constantly on a turntable at a slow speed.
		The faster the disk can rotate will reduce the period of time you are waiting to access a particular section on your HDD.
		When considering drives always query their speed to be sure of the kind of performance and seek times it will be able to offer.
	www.vtec.co.uk /hdd_rotational_speed.asp (233 words)

	SpeedSwitch.com :: Electromechanical, Electronic & Proximity Zero Speed Switches
		Electro Mechanical Speed Switch: A direct coupled speed indicating switch that opens or closes contacts mechanically as a function of the rotational speed of the switch shaft.
		The speed the switch trips at is dependent on the construction of the switch or adjusting internal components.
		The speed the switch trips at is dependent upon user defined switch settings and the rotational input speed of the switch shaft.
	www.speedswitch.com /products.html (170 words)

	Effect of Intracellular pH on Rotational Speed of Bacterial Flagellar Motors -- Minamino et al. 185 (4): 1190 -- The ...
		The rotation mode of the tethered cells was observed with a
		Swimming speed was measured in motility medium at the desired pH.
		High-speed rotation and speed stability of the sodium-driven flagellar motor.
	jb.asm.org /cgi/content/full/185/4/1190 (3108 words)

	Bourns University
		In specifying a potentiometer for applications involving high rotational speed, it is important to keep in mind the trade-off factors with respect to performance, life expectancy and electrical noise.
		The viscosity of long-life lubricants may cause the wiper to lift up off the element at high rotational speeds of 60 RPM or higher.
		Residual lubricant in the pores of the film surface allows high rotational speed without wiper lift and only marginal reduction of rotational life.
	www.bourns.com /bu/bu11_26highrotational.html (183 words)

	Dimatec Inc. - Rotational Speed (1 of 2)
		In general, a peripheral speed of 8 to 13 feet per second (2.4 to 4 metres per second) measured on the outside diameter of the impregnated diamond bit crown will provide an acceptable rate of penetration.
		Consideration should be given to the fact that while a higher rotational speed will usually reduce the rate of wear on the matrix layer, it will not allow new layers of synthetic diamonds to become exposed thus causing the crystals in the original layer to become flat and polished.
		It should be noted that the rotational speed selected is a function of the size of the diamonds set on the bit face as well as the formation conditions.
	www.dimatec.com /products/corebits/operate/rotate/rotate1.htm (655 words)

	CTM Example: DC Motor Speed Modeling
		In the state-space form, the equations above can be expressed by choosing the rotational speed and electric current as the state variables and the voltage as an input.
		The output is chosen to be the rotational speed.
		Since the most basic requirement of a motor is that it should rotate at the desired speed, the steady-state error of the motor speed should be less than 1%.
	www.engin.umich.edu /group/ctm/examples/motor/motor.html (591 words)

	Turntable rotational speed and phase control system for a video disc play/record apparatus (US4123779)
		Video disc play/record apparatus includes a turntable driven by a uni-directional DC motor, a speed loop for controlling motor rotation responsively to horizontal sync signal and a position loop for controlling the rotational phase of the turntable responsively to a frame sync signal.
		The position loop includes means cooperating with the speed loop to regulate the turntable phase of rotation responsively to the phase difference between the outputs of a turntable tachometer and a frame and vertical sync signal source.
		Delay circuits in the speed and position loops provide compensation for detected disc mounting error between a previous recording mounting position and the current mounting position of the disc on the turntable.
	www.delphion.com /details?pn=US04123779__ (465 words)

	2.972 How a Three Speed Hub Works
		Three speed hubs use a planetary gear system to achieve a gear ratio between the sprocket and the wheel.
		This causes the planet gears to rotate which in turn causes the ring gear to rotate.
		When the planetary gear system shifts from side to side the ring gear and the planet carier are engaged or dissengaged from the wheel and the chain.
	web.mit.edu /2.972/www/reports/three_speed_hub/three_speed_hub.html (389 words)

	KMI15/4; Rotational speed sensor
		The KMI15/4 sensor detects rotational speed of ferrous gear wheels and reference marks ¹.
		The sensor consists of a magnetoresistive sensor element, a signal conditioning integrated circuit in bipolar technology and a ferrite magnet.
		The frequency of the digital current output signal is proportional to the rotational speed of a gear wheel.
	www.nxp.com /pip/KMI15/4 (291 words)

	MK21-12ExO-Ri
		The rotational speed monitor MK21-12ExO-Ri is designed to monitor and evaluate pulse sequences.
		The analogue output provides a current signal of 0/4 to 20mA which is proportional to the rotational speed.
		The current output response time to a change of the rotational speed is adjustable by means of a filter time constant.
	www.extronics.com /Product.asp?ProductID=15 (216 words)

	Lecture 6
		In this lecture we discuss rotational inertia, torque, rotational velocity, rotational acceleration and angular momentum.
		The greater the distance of mass concentration, the greater the inertia (resistance to rotation).
		There is an acceleration toward the center since a particle undergoing rotational motion must change direction to stay on the circle.
	physics.usc.edu /Classes/100/Bars/lecture6.htm (307 words)

	- EFO - an Experimental Flying Object
		With the absence of friction this is an ideal invention for rotational studies were concentrating on rotational and gravitational forces is possible.
		One full rotation of the thruster will make 3,14 m of distance at thruster level while one full rotation at outer ring-level will let a point on the ring move 31400 m.
		They could be just to weak as to reach their full speed since with a speed lever of 10000 you need also much more force to reach this speed.
	solar-thruster-sailor.info /efo/efo.htm (1609 words)

	NASGA Message Board - Back building - rotational strength & speed (Site not responding. Last check: 2007-11-05)
		Posted - 06/21/2004 : 4:18:36 PM For most of the events, the rotation of the upper body, in combination with initial acceleration by the lower body — seems to make/break the acceleration phase of a throw.
		Posted - 06/24/2004 : 1:01:46 PM Ryan once told me he does rotational work for the stone by using a curl bar loaded lightly and held at the shoulders, bending over, rotating and then throwing the whole thing outward..
		Doing the rotational exercises during the season could lead to overtraining, since, throwing all the weights, hammers, and stones give you plenty of specific rotational strength just praciticing the events.
	www.nasgaweb.com /messageboard/topic.asp?TOPIC_ID=3156 (1372 words)

	Breaking the Speed Limits
		AV Hard Disk Design Platter Rotation Speed With one exception, AV disks (AV Drives are optimized and calibrated for video playback without dropping frames) have a rotational speed of 7,200 rpm.
		At this speed, the outermost tracks can transfer data to and from the disk's cache at nine MB/S. (The outermost partition is the one you create first.
		And high rotational speed also lowers "average disk latency." The Cheetah's average latency is under three milliseconds.
	digitalcontentproducer.com /mag/video_breaking_speed_limits/index.html (3693 words)

	Relativistic Rotational Speed? (Site not responding. Last check: 2007-11-05)
		The fastest rotational speed I am aware of is a few hundred thousand rpm in devices designed to store energy in the form of rotational inertia.
		As the tangential speed increases the relativistic mass will increase increasing the moment of inertia so that any further increase in speed requires incrementally more energy.
		The force resulting from the centripetal acceleration goes up as the rotational speed increases.
	www.mcasco.com /qa_rrs.html (212 words)

	Speed of the Earth's Rotation
		If by "turning" you mean the rotation of the Earth about its axis (where axis just means the straight line between the North and South poles) it is quite easy to figure out how fast any part of the Earth's surface is moving.
		The speed due to rotation at any other point on the Earth can be calculated by multiplying the speed at the equator by the cosine of the latitude of the point.
		The Earth is doing a lot more than rotating, although that is certainly the motion we notice most, because day follows night as a result.
	imagine.gsfc.nasa.gov /docs/ask_astro/answers/970401c.html (489 words)

	Automotive electrical & sensor engineering - Turbo rotational speed sensor/meter
		Sensing the speed of a turbocharger could be a very difficult task.
		Do not interface your speed pickup sensor directly at the turbine wheel where the maximum temperatures will be seen.
		The turbo has an extended magnetic nut holding the inlet turbine wheel on, and an inductive speed sensor pressed against the rubber pipe that connects the turbo to the intercooler tubing.
	www.eng-tips.com /viewthread.cfm?qid=44813 (1974 words)

	Earth's Rotational Speed
		The earth's rotational speed is one revolution per day.
		It doesn't matter where on earth you stand, that is the rotational velocity.
		I believe that you mean to ask the TANGENTIAL velocity of any point on the earth due to the earth's rotation.
	www.newton.dep.anl.gov /askasci/env99/env057.htm (465 words)

	(WO/1989/007247) COMBINED ROTATIONAL SPEED/TEMPERATURE MEASURING DEVICE (Site not responding. Last check: 2007-11-05)
		(EN) Device for measuring temperatures and rotational speeds of rotating parts, in particular shafts of electric machines such as motors and generators.
		A fixed sensor (1) reacts to the changes of the marks and emits a voltage pulse from which the temperature and the rotational speed can be derived.
		It is also proposed to mount a simple sensor (5, 12) whose position or sensitivity of measurement vary with temperature and which derives the temperature and rotational speed from the arrangement of fixed geometric marks on the shaft.
	www.wipo.int /pctdb/en/wo.jsp?WO=1989/07247 (340 words)

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