IC-PVL datasheet(16/33 Pages) ICHAUS

16 / 33 page

preliminary

iC-PVL LINEAR/OFF-AXIS

BATTERY-BUFFERED HALL MULTITURN ENCODER

Rev B3, Page 16/33

MAGNETIC SCALE SELECTION

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)).

POLEWID

Addr. 0x04; bit 1:0

Code

Pole size

Ideal size

Scanning

0x00

1 - 3 mm

1.5 mm

Off-axis, differential

0x01

4 - 5 mm

4.5 mm

Off-axis, single-ended

0x02

2 - 4 mm

3.0 mm

Off-axis, single-ended

0x03

1 - 3 mm

1.5 mm

Off-axis, single-ended

Table 9: Pole size of magnetic scale

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).

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)

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).

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.

IC-PVL Datasheet(PDF) 16 Page - IC-Haus GmbH

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