Balluff BML-S1C0-Q53-M400-0-KA Serie Mode D'emploi page 20

BML-S1C0-Q53_-M400-_0-KA_ _
Magnetic Linear Encoder System
5 Selecting the Appropriate BML and Controller System
5.3 Determining resolution and max. rotational speed for BML systems with magnet ring (rotary motion)
Table 5-2 shows the relationship
between mechanical resolution and
pulses/revolution for BML systems
with magnet rings.
Step 1
First decide how many pulses per
revolution your application requires.
From this you can derive the
magnet ring outside diameter and
the resolution of the sensor head
and sensor head model.
Table 5-2 shows for each magnet
ring the relationship between the
number of pulses per revolution and
the resolution of the sensor head.
Example (see Table 5-2):
– The application requires 500
pulses/revolution.
– These pulses are provided by the
BML system, consisting of a
sensor head with a resolution of
200 µm (M-type) and a
BML.-M2x...031 magnet ring.
Tables 5 -3 to 5 -5 show the
relationship between the min. edge
separation, mechanical resolution
and the max. rotational speed for
BML systems using magnet rings.
mech. resolutionY
Pulses/revolution
X
min. edge separation max. kHz A/B-Sig
= 10 µs
M 25
= 100 µs
R 25
Table 5-3:
Max. speeds as a function of minimum edge separation and mechanical resolution for magnet ring BML-M2x...031 with
outside diameter 31 mm
8
english
Step 2
If the rotational speed is a given for
your application, select the sensor
head with the minimum edge
separation which corresponds to
the specified pulse count/revolution
and based on the magnet ring and
resolution you selected in Step 1.
Example:
Assumptions:
– The specified pulse number is
500/revolution (see Step 1:
BML-M2x...031 ring and BML
resolution 200 µm).
– The max. rotational speed should
be 900 rpm.
Magnet ring type
No. of poles
Resolution Y
Sensor head
= 100 µm
L
= 200 µm
M
= 500 µm
N
= 1000 µm
P
= 2000 µm
R
Table 5-2: Pulses/revolution of a BML-S1C... system with magnet rings.
Example:
BML-S1C0-Q53L-M400-R0-KA05 (model example)
= 100 µm = 200 µm
L M
1000 500
max. speed for
4.800 6.000
540 1,080
Determining the suitable BML
sensor head (see Table 5-3)
– Search column
"M = 200 µm, 500 pulses" for
every line whose rotational speed
is greater than the required
speed.
The sensor head with 100 µm
edge separation (R-type) is
suitable.
Together with magnet ring
BML-M2x...031 it meets the
system requirements.
BML-M2...031/... BML-M2...048/... BML-M2...072/...
20 32
Pulses per revolution
with 4x interpolation
1,000 1,600
500
200
100
50
min. edge separation
(see Tables 5-3 to 5-5 for codes)
mech. resolution Y
(see Tables 5-3 to 5-5 for codes)
= 500 µm = 1000 µm
N P
200 50100
magnet ring BML-M2x...031...
6.000 6.000
2,520 5,280
46
2,300
800 1,150
320 460
160 230
80 115
X
= 2000 µm
R
6.000
6,000