Additional Parameters For Rotative Applications - Balluff BML-S Série Notice D'utilisation

BML-S _ B/C/E0-Q _ _ _ -M4 _ _ - _ 0-KA _ _ /KA _ _-S284
Incremental Magnetic Linear Encoder
7
System selection (continued)
7.2 Additional parameters for rotative
applications
The BML linear encoder enables precise adjustment to the
respective application with the rotative magnetic tapes
(magnetic rings).
Definition of impulses per rotation
The number of required impulses per rotation varies
depending on the application. It defines the resolution of
the sensor head and the magnetic ring diameter.
BML-S2B/E...
Impulses/rotation with 4x evaluation
Ø exterior magnetic ring
Resolution
31 mm 49 mm
Number of poles (with 5 mm pole width)
20 32
F 5 μm 20,000 32,000
G 10 μm 10,000 16,000
H 25 μm 4,000 6,400
K 50 μm 2,000 3,200
Tab. 7-3: BML-S2B/E...: selection aid for magnetic rings
BML-S1C...
Impulses/rotation with 4x evaluation
Ø exterior magnetic ring
Resolution
31 mm 49 mm
Number of poles (with 5 mm pole width)
20 32
L 100 μm 1,000 1600
M 200 μm 500 800
N 500 μm 200 320
P 1000 μm 100 160
R 2000 μm
50 80
Tab. 7-4: BML-S1C...: selection aid for magnetic rings
Maximum speed
The BML system enables recording of rotative movements.
The speed and magnetic ring diameter determine the
speed of the ring on the sensor head.
The selection of the resolution and edge distance of the
sensor head determines the maximum movement speed
that the sensor can detect. This results in a maximum
speed in accordance with the following formula:
60 × max. movement speed [m/s]
Max. speed [min ] =
–1
π × magnetic ring diameter [m]
www.balluff.com
72 mm 75.4 mm 122 mm
46 48 78
46,000 48,000 78,000
23,000 24,000 39,000
9,200 9,600 15,600
4,600 4,800 7,800
72 mm 75.4 mm 122 mm
46 48 78
2300 2400 3900
1150 1200 1950
460 480 780
230 240 390
115 120 195
Maximum movement speed and minimum edge distance,
see Tab. 7-1 und Tab. 7-2 on page 16.
Recommendation: max. speed 10% less than the
detected speed value.
Max.
movement
speed
31 mm 49 mm
20 m/s 12322 7795
14.75 m/s 9087 5749
10 m/s 6161 3898
8.8 m/s 5422 3430
8 m/s 4929 3118
7.7 m/s 4744 3001
6.5 m/s 4005 2533
5 m/s 3080 1949
4.2 m/s 2588 1637
3.95 m/s 2434 1540
1267
3.25 m/s 2002
3 m/s 1848 1169
1.8 m/s 1109 702
1.7 m/s 1047 663
1.5 m/s 924 585
0.95 m/s 585 370
0.9 m/s 554 351
0.75 m/s 462 292
0.65 m/s 400 253
0.395 m/s 243 154
0.375 m/s 231 146
0.26 m/s 160 101
0.195 m/s 120
0.13 m/s 80
See example below
1)
Tab. 7-5: Maximum speed of rotative magnetic tape (magnetic ring)
Example:
BML-S2B... sensor head with 5 µm (F) resolution and a
min. edge distance of 1 µs (G).
Tab. 7-1 on page 16 produces a max. movement speed of
3.25 m/s for this sensor head. With a magnetic ring
diameter of 49 mm = 0.049 m, a speed of 1267 rpm can
be achieved with this formula (the value can also be read in
Tab. 7-5 (column 49/row 3.25)). Taking into account the
recommendation to remain 10% below this, a speed of
1140 rpm should not be exceeded.
RPM
Outer diameter
72 mm 75.4 mm 122 mm
5305 5066 3131
3913 3736 2309
2653 2533 1565
2334 2229 1378
2122 2026 1252
2042 1950 1205
1724 1646 1018
1326 1266 783
1114 1064 657
1048 1001 618
862 823 509
1)
796 760 470
477 456 282
451 431 266
398 380 235
252 241 149
239 228 141
199 190 117
172 165 102
105 100 62
99 95 59
69 66 41
76 52 49 31
51 34 33 20
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