IC-PVL Datasheet, PDF (16/33 Pages) IC-Haus GmbH – LINEAR/OFF-AXIS BATTERY-BUFFERED HALL MULTITURN ENCODER

iC-PVL LINEAR/OFF-AXIS
preliminary
BATTERY-BUFFERED HALL MULTITURN ENCODER
MAGNETIC SCALE SELECTION
Rev B3, Page 16/33
iC-MU
iC-PVL
dra_mu1l_mu_pvl_side_view_colored
Figure 8: Positioning of iC-PVL on a linear scale (iC-MU nonius type)
iC-PVL is able to scan magnetic pole wheels or linear
scales with a pole width of 1 mm to 5 mm. This corre-
sponds to a magnetic period (N-S sequence) of 2 to
10 mm. Due to the diagonal sensor array, iC-PVL is ro-
tated 45° in relation to the magnetic code (see Figures
8, 9, 10).
With the recommended differential scanning mode
(POLEWID = 0x00), the measurement is highly toler-
ant to external common mode magnetic stray fields.
The ideal pole width in this operating mode is 1.5 mm,
but the device is functional with a pole width range
of about 1 to 3 mm. This enables iC-PVL to use the
same magnetic scale as a linear or off-axis singleturn
sensor (e.g. iC-MU (1.28 mm), iC-MU150 (1.5 mm),
iC-MHL200 (2 mm)).
iC-MU
iC-PVL
dra_mu2s_mu_pvl_side_view_colored
Figure 9: Positioning of iC-PVL on a pole wheel
(iC-MU nonius type)
POLEWID
Code
0x00
0x01
0x02
0x03
Addr. 0x04; bit 1:0
Pole size Ideal size Scanning
1 - 3 mm 1.5 mm
Off-axis, differential
4 - 5 mm 4.5 mm
Off-axis, single-ended
2 - 4 mm 3.0 mm
Off-axis, single-ended
1 - 3 mm 1.5 mm
Off-axis, single-ended
Table 9: Pole size of magnetic scale
iC-MU
iC-PVL
dra_mu2s_mu_pvl_top_view_mono
Figure 10: Positioning of iC-PVL on a pole wheel
(iC-MU nonius type).
Together with the iC-MU off-axis nonius encoder, a mag-
netic multiturn encoder can be realized (see Figure 13,
P. 28). The iC-PVL Hall sensor array is placed over
the center line of a magnetic track, e.g. at a radius
of 13.375 mm to scan the master track of the MU18S
30-32N magnetic target (see Figure 10). In this case,
the corresponding PCR value for 32 magnetic periods
(PCR = 0x1F) has to be applied (see Table 10).
In these applications, a certain number of magnetic pe-
riods (i.e., north-south pole pairs) may be interpreted as
one mechanical revolution. The FlexCount^® logic offers
this functionality. By electrically emulating the charac-
teristics of a gear box, the gear transmission is freely
programmable. 1 to 256 pole pairs can be interpreted
as one mechanical revolution. The configuration param-
eter PCR, period counts per (mechanical) revolution, is
used as defined in Table 10.