A measure having as its zero point or base the complete absence
of the entity being measured.
Pressure: the pressure above zero absolute i.e. the sum of atmospheric
and gauge pressure. In vaccum related work it is usually expressed
in millimeters of mercury (mm Hg)
Positioning: Refers to a motion control system employing position
feedback devices (absolute encoders) to maintain a given mechanical
Programming: A positioning coordinate referenced wherein all
positions are specified relative to some referance, or "Zero"
position. This is different from incremental programming, where
distance are specified relative to the current position.
A change in velocity as a function
of time. Acceleration usually refers to increasing velocity, and
declaration to decreasing velocity.
Servo: A general term referring to a motor drive that generates
sinusoidal shaped motor currents in a brushless motor wound as to
generate sinusoidal back EMF.
The change in velocity of time. Acceleration usually refers
to increasing velocity and deceleration describes decreasing velocity.
A measure of the difference between expected position and actual
position of a motor or mechanical system. Motor accuracy is usually
specified as an angle representing the maximum deviation from expected
Air in the hydraulic fluid. Excessive aeration causes the fluid
to appear milky and components to operate erratically because of
the compressibility of the air trapped in the fluid.
Current (AC): A continuously changing magnitude of current,
produced by a power source (e.g. generator, alternator)
Temperature: The temperature of the cooling medium, usually
air, immediately surrounding the motor or another device.
A device for amplifying either voltage or current.
Signal: An AC or DC voltage or current signal that represents
variable physical quantities (e.g. voltage, current, pressure, temperature
Logic Gate: A digital circuit in which the output state equals
a binary 1 if and only if all of its input are a binary 1 at the
Area: A ring shaped area- often refers to the net effective
area of the rod-side of a cylinder piston, i.e. the piston area
minus the cross-sectional area of the rod.
American Standard Code for Information Interchange. This code
assigns a number series of electrical signals to each numeral and
letter of the alphabet. In this manner, information can be transmitted
between machines as a series of binary numbers.
(One): A pressure measure equal to 14.7 psi.
Pressure exerted by the atmosphere at any specific location. (Sea
level pressure is approximately 14.7 pounds per square inch absolute.)
A variable resistive device used to reduce the value of current