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Example
Lead of ball screw L = 10mm
Reduction ratio R=1
Position resolution
1
∆M = 0.005mm
For the encoder of 2500 P/r
(E=10000P/r)
Lead of ball screw L = 20mm
Reduction ratio R=1
Position resolution
2
∆M = 0.005mm
For the encoder of 2500 P/r
(E=10000P/r)
Example
Lead of ball screw L= 20mm
Reduction ratio R=1
Position resolution
∆M = 0.005mm
Line driver pulse input
500 kpps
For the encoder of 2500 P/r
To make motor rotation speed
3000 r/min under the same
condition as above, with lead of
ball screw of L = 20 mm and the
line driver pulse input of 500 kpps.
Command dividing
D =
multiplier ratio
0.005 x 10000 x 1
D =
10
= 5
0.0005 x 10000 x 1
D =
20
= 0.25
Motor rotation speed (r/min)
0.005 x 10000 x 1
D =
= 25
N = 500000 x
= 7500
Thus, motor specification is not met.
Command dividing
D =
multiplier ratio
3000 x 10000
D =
500000 x 60
Then, distance per command pulse (mm) is as follows:
(position resolution)
D
1
∆M =
x
x L =
E
R
10000
179
∆M x E x R
... Formula (3)
L
Determine
parameters Pr46,
Pr4A and Pr4B so
that D=5. Consider
the following:
0
10000 x 2
D =
2000
D<1 is not
appropriate to
determination of
the accuracy.
N = F x
... Formula (3)
20
2.5
x 60
... Formula (5)
10000
N x E
... Formula (6)
F x 60
Determine
parameters Pr46,
Pr4A and Pr4B so
that D=1. Consider
= 1
the following:
10000 x 2
D =
10000
1
1
x
x 20 = 0.002mm
1
[Reference]
Pr4A
Pr46 x 2
D =
Pr4B
Pr46 = 10000
Pr4A = 0
Pr4B = 2000
D = 1 is a condition
of minimum
resolution.
D
x 60
... Formula (5)
E
Pr4A
Pr46 x 2
D =
Pr4B
Pr46 = 10000
Pr4A = 0
Pr4B = 10000
0
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