Technical data
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Version: 2.1
eXtended Transport System
Technical data
Below you will find definitions of terms, environmental conditions,
operating details and technical data for the XTS.
Definition
All details relate to an ambient temperature of 40 °C. The data can
have a tolerance of +/- 10%.
Technical term
Symbol/
unit
Definition
Nominal force
F
0
[N]
Nominal force that a mover can continuously apply.
Force constant
K
F
[N/A]
Specification of how much force in N the mover generates with a certain mover cur-
rent.
The equation is F
0
= I
0Mover
x K
F
Voltage constant
K
E
[Vs/m]
Induced motor EMF related to 1 m/s as a peak sine value on a motor coil.
Thermal time constant
tTH [min]
Specification of the heating time of the cold module when loaded with the nominal
force until 63% of the maximum overtemperature is reached. This temperature rise
happens in a much shorter time when the motor is loaded with the peak current.
Absolute accuracy
[mm]
Specification of the difference between an expected set position and the mean value
of the actual position resulting from approaching the set position from different direc-
tions (multi-directional). The absolute accuracy is valid within a module and is de-
fined as the difference between the set position and the actual position of the posi-
tioning system.
Standstill repeatability
[mm]
Specification of how accurately the system positions when approaching a position
from the same direction (unidirectional). The standstill repeatability is to be evaluated
as the average difference between the actual position and the set position and is the
most important measure for the assessment of a positioning system. It defines the
variance around the mean value with a large number of positionings.
The variance of the positions is illustrated by the "Gauss distribution" or normal distri-
bution. The standstill repeatability is defined by three standard deviations (3σ) with a
probability of 99.74%.
Synchronization accuracy [mm]
Specification of the fluctuations that the system exhibits in the position (lag error) dur-
ing a position-controlled movement at a constant set speed. The synchronization ac-
curacy depends on the mechanical rigidity, the applied load on the movers, the con-
troller settings, the set speed and also any mechanical offset between the modules.
