Linear Positioners Catalog_en-US_revA - Kollmorgen

Glossary of Motion Control TerminologyScrew AssemblyDevice which converts rotary motionto linear motion.MassThe quantity of matter that an objectcontains.MicroprocessorA device that incorporates many orall functions of a computer in a singleintegrated circuit. Used to performcalculations and logic required to domotion or process control.Moment (Load)Rotational forces applied to a linearaxis, typically expressed as yaw, pitch,and roll.Motion ProfileA method of describing a moveoperation in terms of time, position,and velocity. Typically velocity ischaracterized as a function of time ordistance which results in a triangularor trapezoidal profile.MotorA device which converts electricalenergy into mechanical energy.Non-Volatile MemoryMemory that does not lose informationon loss of power.Open Collector (NPN)An output signal which is provided bya transistor where the “open collectoroutput” acts like a switch closure toground when activated.Open LoopA positioning system which does notemploy feedback information.Optically CoupledAn interface circuit that transmitsa signal with no direct electricalconnection except for the logic ground.Optical IsolationAn interface circuit that transmitsa signal with no direct electricalconnection.OvershootThe amount by which a parameterbeing controlled exceeds the desiredvalue. Typically referring to velocity orposition in servo systems.PID (Proportional, Integral, andDerivative)Refers to a group of gain parametersused for tuning or optimizing theresponse of a closed loop positioningsystem.PitchThe number of revolutions a Ball / LeadScrew must turn for the nut to travelone inch (single start only).PLC (Programmable Logic Controller)A programmable device which utilizes“ladder” logic to control a bank ofinputs and outputs which are interfacedto external devices.PowerHow much work is done in a specificamount of time.PWM (Pulse Width Modulation)A type of adjustable frequency driveoutput where the drive’s output voltageis always a constant amplitude and by“chopping” (pulse width modulating)the average output power is controlled.RAM (Random Access Memory)A memory chip that can be read fromand written to. Used as a medium fortemporary information storage. Data islost after power loss.RepeatabilityThe ability of a positioning systemto return to an exact location duringoperation (from the same directionwith the same load and speed).ResistanceThe opposition to the flow of chargethrough a conductor.ResolutionThe smallest positioning incrementachievable. In digitally programmedsystems it is the smallest specifiablepositioning increment.ResonanceOscillatory behavior in a mechanicalbody when operated or subjected to aperiodic force occurring at its naturalfrequency.ROM (Read Only Memory)A memory chip that can be read butnot altered.RS232CA method of Serial Communicationwhere data is encoded and transmittedon a single line in a sequential timeformat.ServomotorA motor which is used in closed loopsystems where feedback is used tocontrol motor velocity, position, ortorque.Spur GearGears with teeth straight and parallelto the axis of rotation.Stepper MotorMotor which translates electricalpulses into precise mechanicalmovements. Through appropriatedrive circuitry, controlling the rateand quantity of pulses will control themotor’s velocity and position.ThrustThe measurement of linear force.TorqueA measure of angular force whichproduces rotational motion.TTL (Transistor-Transistor-Logic)Refers to a family of integrated circuitdevices used for control. Typically usevoltage levels from 5-12 Vdc.Velocity (Speed)The change in position as a function oftime.VoltageDifference in electrical potentialbetween two points.WeightForce of gravity acting on a body.Determined by multiplying the mass ofthe object by the acceleration due togravity.L I N E A R P O S I T I O N E R Swww.kollmorgen.com99