LSA-10A-30-D-130 Technical Document
-11-
This indicates the width of the allowable positioning error for following the positioning command signal.
Generally, necessary and sufficient conditions of positioning accuracy are considered convergence criteria.
The device is adjusted to the conditions that a range of constant speed is maximized.
・
In case of quick operation, set the convergence criteria broadly and adjust the gain for extending the
range of constant speed. In case of high accuracy operation, set convergence criteria narrowly.
・
If the range of constant speed is the same, the convergence criteria can be narrowed as the size of the
emphasized adjustment amplitude decreases.
[7] Range of Constant Speed (Unit: [%])
Assuming that the positioning command signal is a constant slope, the portion of the positioning error
signal being kept within the convergence criteria is a constant speed range. The proportion of the
constant speed interval and the command interval is the constant speed range [%].
As the shaft rotates inverse direction in the triangular wave drive, positioning error immediately after
inversion is large.
[8] Position Delay (Unit: [ms] or [μs])
This indicates time delays between positioning sensor signals and positioning command signals.
Normally, position delay is measured at the position of the sensor origin point. (There may be fluctuations
based on measurement positions.)
[9] Drive Frequency (Unit: [Hz])
This indicates the actual drive frequency.
As the frequency increases, the range of constant speed decreases.
Please refer to “Supplementary Explanation of Optical Scanner Operating conditions Form” (2-4-1) for other
features.
♦
Triangular Wave Drive
Response Characteristics Example 1 (range of constant speeds vs.
frequencies with amplitude as the parameter)
50
60
70
80
90
100
0
20
40
60
80 100 120 140 160 180 200 220 240 260 280
周波数 [Hz]
等速範囲
[％]
Amplitude: 30
°
5
°
10
°
20
°
Load (J
L
): Mirror for Our Test Equipment (2.2g-cm
2
)
Convergence Criteria: 0.2% Amplitude/Power Source Capacity:
±
24V, 240W
Heat Radiation Conditions During Continuous Drive:
Driver 150x150x6mm Aluminum Heat Sink + Air Cooling Fan (8W)
Clamp the entire surface of the scanner mount surface
C
ons
tant
S
p
eed
R
an
ge [
%
]
Frequency [Hz]
