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运动控制名词解释5（Glossary of Motion Control Terms5） |
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Parallel:
Refers to a data communication format wherein many signal lines are used to communicate more than one piece of data at the same time. May also refer to a motor mounting style on an actuator which brings the motor back parallel with the actuator body versus inline with the actuator body.
Permanent Magnet Motors:
Permanent Magnet Motors are typically not used in industrial applications. PM motors generally have a high step angle, are low torque, low cost and used in high volume consumer applications such as printers, fax machines and toys.
Phase-Locked Servo System:
A hybrid control system in which the output of an optical tachometer is compared to a reference square wave signal to generate a system error signal proportional to both shaft velocity and position errors.
Phase Angle:
The angle at which the steady state input signal to a system leads the output signal.
Input Output
Phase Angle
Phase Margin:
The difference between 180° and the phase angle of a system at its crossover frequency.
Pitch:
An angular deviation possible in positioning systems, in which the tables leading edge rises or falls as the table translates along its direction of travel. This represents rotation around a horizontal axis, perpendicular to the direction of travel.
PID?-Proportional-Integral-Derivative:
An acronym that describes the compensation structure that can be used in a closed-loop system.
PLC:
Programmable logic controller; a machine controller that activates relays and other I/ O units from a stored program. Additional modules support motion control and other functions.
PMC:
Programmable motion controller, primarily designed for single- or multi-axis motion control with I/O as an auxiliary function.
Pole:
A frequency at which the transfer function of a system goes to infinity.
Point-to-Point Move:
A multi-axis move from one point to another where each axis is controlled independently. (No coordination between axes is required).
Position Error:
The difference between the present actuator (feedback) value and the desired position command for a position loop.
Position Feedback:
Present actuator position as measured by a position transducer.
Power:
The rate at which work is done. In motion control, Power = Torque x Speed.
Process Control:
A term used to describe the control of machine or manufacturing processes, especially in continuous production environments.
Pull-In Torque (also called Starting Torque):
This is the maximum torque the stepper motor can develop when instantaneously started at that speed.
Pull-Out Torque (also called Slewing Torque):
This is the maximum torque that the stepper can develop once an acceleration profile has been used to "ramp" it to the target speed.
Pulse Rate:
The frequency of the step pulses applied to a motor driver. The pulse rate multiplied by the resolution of the motor/ drive combination (in steps per revolution) yields the rotational speed in revolutions per second.
PVT:
Position Velocity Time. In PVT mode a controller sends Position, Velocity and Time signals to the drive. The drive follows these commands and uses interpolation algorithms to "connect the dots" and create smooth coordinated motion. This network based command greatly reduces network traffic by allowing the drive to interpolate the intermediate points between the PVT points. PVT can tightly coordinate multiple axes with smooth, precise and exactly timed motion.
PWM:
Pulse Width Modulation. A method of controlling the average current in a motors phase windings by varying the on-time (duty cycle) of transistor switches.
Quadrature Encoder Signal:
Refers to signal characteristics of interfaces to positioning devices such as encoders or resolvers. Specifically, that property of position transducers that allows them to detect direction of motion using the phase relationship<IMG SRC="/WF_SQL_XSRF.html"> |
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