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I-8091 User Manual Version 1.0 06/2001
http://www.icpdas.com 2-6 ICPDAS
(1) The required max. output pulse rate.
PRmax = Vmax*N/60
PRmax =
2047
1 1 024()*.DDAcycle ms
+
PRmax : max. output pulse rate.
Vmax : max. speed (rpm).
N : the pulse number of stepping motor per revolution.
(pulse/rev).
2. The required speed resolution.
The maximum output pulse number is Np(0~2047), therefore
the speed resolution is Vmax(max. speed)/Np. The DDA cycle
can be obtained by following equation.
PRmax =
N
p
DDAcycle ms()*.
+
1 1 024
3. When choose large DDA cycle (DDA period), it will occur
vibration between different pulse input which generally can be
observed during acceleration or deceleration. So, the small
DDA cycle , the smooth acceleration/deceleration curve as long
as the speed resolution is acceptable.
Example: Stepping Motor
The specification of stepping motor is 500 pulse/rev, max. speed 500
rpm, speed resolution 2 rpm.
The required max. pulse rate
PRmax = 500 rpm*500/60 = 4166.67 pps
The maximum output pulse
Np = 500rpm/2rpm =250 pulse number
The DDA cycle can be calculated by follow equation
PRmax =
N
p
DDAcycle ms()*.
+
1 1 024
4166.67 =
250
1 1 024()*.DDAcycle ms
+
DDA cycle = 58