IC-MU_17 Datasheet, PDF (48/66 Pages) IC-Haus GmbH – MAGNETIC OFF-AXIS POSITION ENCODER - POLE WIDTH 1.28MM

iC-MU MAGNETIC OFF-AXIS
POSITION ENCODER - POLE WIDTH 1.28MM
UVW COMMUTATION SIGNALS
Rev D1, Page 48/66
MODEB
Code
0x1
Description
UVW
Table 82: MODEB: UVW
iC-MU can generate commutation signals for BLDC mo-
tors from 1 up to 16 pole pairs. The hysteresis is set
fixed to 0.0879° referenced to a mechanical revolution.
Figure 45 shows the commutation sequence for a motor
with 6 pole pairs. Here, a commutation sequence span-
ning an angle of φ_360UVW repeats itself 6 times within
one mechanical revolution of the motor. The phase shift
between the commutation signals is 120°.
U
V
W
φ
φ
mech
0°
120uvw
φ
360uvw
60°
120°
300°
360°
Figure 45: commutation signals UVW
Register OFF_UVW is used to set the start angle and
compensate for the offset between the winding of the
BLDC and the Hall sensor signals. This angle can be
set with 12 bits.
Note:
After startup or the commands SOFT_RESET and
ABS_RESET the OFF_UVW values are amended
to include the nonius data, with a configured multi-
turn updated with the multiturn data, and stored as
OFF_COM in the internal RAM.
OFF_UVW(3:0) Addr. 0x28; bit 7:4
OFF_UVW(11:4) Addr. 0x29; bit 7:0
OFF_UVW(3:0) Addr. SER:0x4B; bit 7:4
OFF_UVW(11:4) Addr. SER:0x4C; bit 7:0
Code
Offset UVW signals
0x000
0.00° mech
0x001
...
0xFFF
0.09° mech
360.0° mech
4096
·
OFF_UVW
359.9° mech
Table 85: Commutation signal start angle
Using parameter PPUVW the number of commutation
sequences per mechanical revolution can be set.
PPUVW(5:0)
Addr. 0x17; bit 5:0
Code
number of pole
pairs
Code
0x02
1 pole pair
0x1A
0x05
2 pole pairs
0x1D
0x08
3 pole pairs
0x20
0x0B
4 pole pairs
0x23
0x0E
5 pole pairs
0x26
0x11
6 pole pairs
0x29
0x14
7 pole pairs
0x2C
0x17
8 pole pairs
0x2F
number of pole
pairs
9 pole pairs
10 pole pairs
11 pole pairs
12 pole pairs
13 pole pairs
14 pole pairs
15 pole pairs
16 pole pairs
Table 83: Number of commutation signal pole pairs
The sequence of the commutation signals can be se-
lected by φ_120UVW as in Figure 45 or with a distance of
60° between two neighboring rising edges referenced
to one UVW cycle using parameter PP60UVW.
OFF_COM(3:0) Addr. SER:0x23; bit 7:4
R
OFF_COM(11:4) Addr. SER:0x24; bit 7:0
R
Code
Description
0x000
...
start angle commutation signal (automatically
computed)
0xFFF
Table 86: Commutation signal start angle amended by
the nonius/MT
The direction of rotation can be inverted with parameter
ROT. The parameter affects the output of the data word
through the serial interface in MODE_ST=0x0 and 0x1,
the ABZ-interface and the UVW-interface.
ROT
Code
0
1
Addr. 0x15; bit 7
Description
no inversion of direction of rotation
inversion of rotation
Table 87: Inverted direction of rotation
PP60UVW
Code
0
1
Addr. 0x16; bit 3
Phase UVW signals
120° phase shift
60° phase shift
Table 84: Commutation signal phase length