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Topic: Servo

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World Series

	Whats a servo: A quick tutorial
		The servo motor has some control circuits and a potentiometer (a variable resistor, aka pot) that is connected to the output shaft.
		A normal servo is used to control an angular motion of between 0 and 180 degrees.
		A normal servo is mechanically not capable of turning any farther due to a mechanical stop built on to the main output gear.
	www.seattlerobotics.org /guide/servos.html (574 words)

	How to build a PIC16F84 Servo Controller
		Servo Commander was designed after quite a few people asked for a version of the serial servo controller that would let the user select a different serial port on the PC, and had the ability to control 8 servos.
		The only limitation using Servo Commander with the Basic Stamp I is that you will only be able to control (7) servo motors because at least one of the (8) available I/O pins will be needed to receive serial data from the PC.
		Since a value of 100 will send the servo to its far right position, this was necessary to make the motors move in the same direction as the control knobs.
	www.rentron.com /SerialServo.htm (2861 words)

	Servo Computer Services
		Servo shall use its best endeavors to deliver the goods to the customer on the due date for delivery, but does not guarantee to do so and shall not be liable for any expense, loss or damage arising out of any delay or late delivery or for any failure to make delivery.
		Servo shall retain title to the goods supplied until such time as the purchase price and packing and delivery charges for those goods and all other goods from time to time supplied by Servo shall have been paid in full by the customer.
		All contracts with Servo shall be governed by and shall be enforced in accordance with the law of the England and Servo and the customer hereby submit to the jurisdiction of the English courts.
	www.servo.co.uk /TermsAndConditions (1329 words)

	Servo Control
		The output of a servo loop is a torque (or, equivalently, current) command, which is delivered to the motor control algorithms and circuits.
		Servo control loops are built to control motion: position, velocity, or both.
		For example, the servo system accuracy is limited by the accuracy of the feedback device and the resolution of the feedback sensor is often the major contributor to system noise.
	www.motionvillage.com /training/handbook/drive/servocontrol/index.html (433 words)

	What is a servo?
		A Servo is a small device that incorporates a three wire DC motor, a gear train, a potentiometer, an integrated circuit, and an output shaft bearing.
		The electronics of a servo are pretty much the same in all servos, but the output shaft bearing of a servo has either a plastic on plastic bearing that will not take much side load or a metal on metal bearings that stand up better under extended use, or ball bearings which work best.
		Servos are constructed from three basic pieces; a motor, a potentiometer (variable resister) that is connected to the output shaft, and a control board.
	www.servocity.com /html/what_is_a_servo_.html (593 words)

	RC Stuff and links to: Servo-Motor 101
		Given the rotation constraints of the servo, neutral is defined to be the position where the servo has exactly the same amount of potential rotation in the counter clockwise direction as it does in the clockwise direction.
		Servos will not hold their position forever though, the position pulse must be repeated to instruct the servo to stay in position.
		Since a servo is, at its heart, a DC gear motor with enough torque to move a small platform, servos are often modified to become drive motors.
	www.repairfaq.org /filipg/RC/F_Servo101.html (1619 words)

	Servos Wiring Diagrams
		Some brands of servos are really great for a particular use in a particular plane, and there are other companies that sell their servos with each different manufacturer's connector installed (you just have to ask for what you want).
		For Futaba, Hitec, and JR Radio, the servo and battery connections have the right polarity and signal wires, although the connectors are physically different.
		This means that if you have a Airtronics servo with one of the "Z" connectors, you won't have to switch (+) and (-) wires to use that servo with Futaba, Hitec, or JR Radio receivers.
	www.fatlion.com /sailplanes/servos.html (739 words)

	IT service management - Servo
		Vista Expert Describes Benefits of IO Servo is the only SME sector partner in the UK that has been invited to take part in the pilot of the Infrastructure Optimisation tool...
		Servo works with many retail chains, offering solutions for hardware and software support, helpdesk and pre-emptive health checks’ on their equipment.
		Servo's methodology has been adopted by many customers who realise that they need a trusted advisor on their journey to create mature and capable IT services.
	www.servo.co.uk (626 words)

	Servo
		The integrated circuits used to drive the servo and trim motors are internally equipped to detect and report to the SMP a variety of fault conditions including:
		The servo employs a clutch, which allows the pilot to override the servo by applying moderate force to the control stick.
		If the slip clutch is employed for over 8 seconds, the servo will report this as an unusual activity and the control module will command a complete disconnect, allowing the pilot friction-free access to the elevator control.
	www.trioavionics.com /servo.htm (681 words)

	Kite Aerial Photography Electronic Resources--Basics-Servo Conversion-Introduction-KAPER
		The servo used for panning the rig ideally needs at least 360° of movement to allow the camera to be aimed in any compass direction.
		As the servo motor turns it is connected by gears to a pot in the servo (Figure 1).
		The servo is further limited by the fact that the transmitter only turns the "pot" through half of the range between the stops.
	www.kaper.us /basics/Bas_360_R.html (390 words)

	oServo Object
		Up to 20 servos positioned at full swing swing can be controlled at low-torque and up to 6 servos positioned at full swing can be controlled at high torque.
		A servo manufacturer typically publishes that their servos are only able to rotate 90 degrees with some areas for adjustment.
		Even with the same manufacturer and model of servo, the mechanical capability may translate to a different area of the servo, so it is important to make this adjustment for each servo in use.
	www.oopic.com /oservo.htm (1522 words)

	servo hut
		Servos do fail but a grand majority of issues with servos is not the servo itself.
		Servo Hut shall not be held liable for any consequential, incidental, direct damages, or expenses associated with the use or misuse of its products.
		Items sold by Servo Hut are not authorized for use as critical or supporting components in devices used in life support and/or other system whose failure or performance would or could result in compromised safety or danger to life or property.
	www.servohut.com /faq.htm (1470 words)

	Servo Motors: Theory, Hardware, and HC11 code
		The kind of servo motor we are going to look into is a motor which has a feedback mechanism to sense it's position.
		A typical servo consists of a DC motor, a gearhead, a potentiometer for position feedback, and a small circuit to read the pot and position the motor.
		The brief explanation is to: Open the servo, remove the pot and replace it with 2 resistors to simulate the pot at it's midpoint.
	home.earthlink.net /~tdickens/68hc11/servo/servo.html (1560 words)

	How to modify a servo
		The theory behind this hack is to make the servo think that the output shaft is always at the 90 degree mark.
		Since the feedback from the output shaft is disconnected, the servo will continue in the appropriate direction as long as the signal remains.
		This device is not intended to be driven from the output shaft, and it may cause undo wear and tear on the servo motor.
	www.seattlerobotics.org /guide/servohack.html (857 words)

	General servo FAQ (Site not responding. Last check: )
		A. On all Hitec servos the fl wire is battery ground (negative), the red wire is battery power (positive) and the white or yellow wire is receiver signal.
		If you have two servos on a y-harness one will have to be modified for reverse rotation or a reversing y-harness used.
		Even though micro servos like the HS-81 may offer 38oz/in of torque, they are not appropriate for larger powered aircraft due to the flight loads placed on the control surfaces.
	www.hitecrcd.com /Support/Faqs/Faq_Genservo_.htm (1118 words)

	FMA Servo Lab
		The servo lab can be used in receiver mode to measure the transmitter pulse width on a receiver channel connected to the servo lab.
		In this mode the servo connected to the servo lab can be directly controlled via the two buttons on the front of the servo lab.
		When setting up servos for use in a CCPM helicopter it is very useful to be able to set the servos centres without having to use the transmitter and approximate centre stick.
	www.trextuning.com /servolab.php (1045 words)

	Visual Show Automation - How Serial Servo Controllers Work - Mini-SSC, SV203, SMI, Parallax
		The SERVO byte indicates which servo needs to be moved (it cannot be 255).
		The board and servo numbers are one-based (i.e., the first board is number one and the first servo is number one).
		Servos are commanded at the highest possible speed to allow VSA the greatest resolution.
	www.brookshiresoftware.com /rd_how_sscs_work.htm#parallax_converter (1999 words)

	Comparison of servo motor control methods, includes data; block diagrams.
		The SST servo drive, introduced in 1994, was the first commercially available unit to employ this architecture for permanent magnet brushless motors, and to our knowledge, is the only drive of its type on the market today (although there are a number of drives available that superficially appear to employ the same architecture.).
		While SST servo drives have a noticeable advantage even at zero speed, you can see that their real superiority is its near-zero response time at rated speed.
		The effect of a misalignment in the electromagnetic vector is that the torque calculated by the main servo algorithm as necessary to achieve the desired velocity and position is not produced.
	www.worldservo.com /html/arc.htm (3789 words)

	audio-servo
		If the sound is short in duration, the servo will not have time to drive to "max" but will drive part way and return to "min" position.
		The important thing to keep in mind when driving multiple servos is that you need a power supply that will handle the combined current of the servos.
		As I mentioned at the beginning, the servo will respond to any sounds it's given, so if you have a voice track with music in the background, the servo will not only respond to the voice but the music as well.
	www.scary-terry.com /audioservo/audioservo.htm (1113 words)

	The Pololu Serial 16-Servo Controller
		Multiple servo controllers can be connected to a single serial line, and they are compatible with our serial 8-servo controller, micro dual serial motoro controller and dual serial motor controller, so that an almost arbitrary number of servos and motors can be controlled with one serial line.
		You can purchase the servo controller as a kit so you can assemble it yourself (which requires soldering), or you can purchase a preassembled servo controller that is soldered and tested for you.
		If you are interested in controlling fewer than 9 servos, you may want to consider the 8-servo version of this item.
	www.pololu.com /products/pololu/0240 (232 words)

	Servo Dynamics - Motion Control Electronics, Brush and Brushless Servomotor, Servo Drive for sale
		Contact Us Servo Dynamics has Over 20 years experience designing and providing solutions for motion control, such as brush, brushless, AC, DC servomotors, servo drives and amplifiers.
		Servo Dynamics is an ISO 9001:2000 company, maintaining the highest standard of quality throughout our design and manufacturing process.
		Program and store in the servo drive motion profiles and multi-axis coordinated moves to be executed through a network connection or I/O. These servo drives operate straight from the AC line, 120/220/380/460 VAC (nominal) and can produce up to 2.3 kW of continuous power.
	www.servodynamics.com (685 words)

	Robots, Servo Information
		See: How Servos Work For a Type 2 motor servo, the farther the pulse is from 1.5 milliseconds long, the faster the wheel turns.
		For a Type 1 positioning servo, the rotation angle of the servo shaft is proportional to the pulse length over or under 1.5 milliseconds.
		This is a transmitter that has controls movable by fingers, a receiver that has the connections to the three wires of the servos, and a battery that runs the receiver and servos.
	www.csee.umbc.edu /~squire/r_servo.shtml (789 words)

	Servo Control
		The servo PWM signal consists of a 50Hz (20ms period) pulse train, in which the pulses may vary from 1ms - 2ms in width (I find 0.5-2.5ms is needed for full range of motion).
		Even if the servo isn’t strong enough to damage itself, the DC motor inside will draw a very large current while it is stalled out.
		The servo controller’s serial port has a CTS (Clear to Send) output that goes high when the chip is ready to receive new serial data.
	www.pitt.edu /AFShome/s/o/sorc/public/html/robotics/handbook/ServoControl.htm (900 words)

	Servo Motors: Baldor, a leader in motion control, servo, linear motors, energy efficient electric motors and adjustable ...
		All Baldor servo motors are designed for durability, and ability to handle harsh environments in applications.
		Baldor also supply a complete range of compatible servo drives, from simple 'amplifiers' through to fully programmable single axis positioners.
		Baldor's DC Servo motors were designed rugged to meet demanding requirements of industrial motion control.
	www.baldormotion.com /products/servomotors/servomotors.asp (700 words)

	Servo Motor Repair 1-888-932-9183 at Accu Electric Motor
		We have a large stock of spare parts for servo motors, including connectors, magnets, resolvers, encoders.
		Servo repair performed on over 30,000 servo motors, stepping motors, and pancake motors.
		We repair servo motors for industrial companies all across North America.
	www.servo-repair.com (121 words)

	Linear Servo Amplifiers for High Performance Applications
		These transconductance (current mode) linear servo amplifiers are ideal for low friction applications requiring high bandwidth, low noise and minimal distortion from the power electronics.
		These linear servo amplifiers are easily configured using either the on-board jumpers or with the built-in serial interface.
		This feature tunes out the inherent imbalances found in any analog servo output stage, allowing full power to be delivered to the windings of the motor.
	www.varedan.com /linear_brushless_3_phase.htm (467 words)

	AI Servo Information
		Specifically, in a continuous AI Servo AF sequence, the first exposure is always handled as ‘release priority,’ while subsequent exposures in that sequence are handled with ‘focus priority’ according to Canon’s definition of that term.
		Although AI Servo AF is designed to be simple to use, it must, by necessity, operate according to the user’s selection of these parameters.
		However, the way in which the AI Servo AF function is overlaid on the mechanical functions of the camera is unique to the EOS 1.
	photonotes.org /other/ai-servo.html (2696 words)

	USB servo Controller,hobby servo Controller, Robot Servo Controller,servo controller (Site not responding. Last check: )
		The torque for hobby servos is usually somewhere between 8 to 100 ounces.
		The servos are used to control the steering mechanics because they are fast, accurate, and light.
		A controller acts as an interface between the servo motor and whatever it is that wants to move it by translating the original signal into something the motor understands.
	www.phidgetsusa.com /servo_controllers.asp (981 words)

	Servo Control
		This digital servo programmer allows you to reset factory defaults, preset and turn failsafe point on or off, change the direction and speed of rotation, adjust the deadband width, and change the end and neutral points.
		This device is required to change the Hitec digital servos from ~140° to 180° range capability.
		Useful for aligning servos during construction of a robot or experimenting with motor drivers without needing to write a program.
	www.lynxmotion.com /Category.aspx?CategoryID=52 (195 words)

	Servo Handbook
		The Servo Handbook is an on-line document that discusses topics of interest to servo engineers, technicians, and engineering managers.
		Servo control encompasses a wide range of subjects.
		Whether you need an introduction or an in-depth discussion, the Servo Handbook is the right place to get reliable, useful information on servos.
	www.motionvillage.com /training/handbook (278 words)

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