IC-PI datasheet(35/49 Pages) ICHAUS

35 / 49 page

preliminary

iC-PI PROGRAMMABLE 12-BIT

Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

Rev B1, Page 35/48

COMMUTATION SIGNALS

Selecting UVW Mode, commutation signals become

available at pins NA, NB and NZ. The pins PA, PB, and

PZ still present the incremental quadrature signals.

The setting of the parameter DUAL is relevant for gen-

erating the commutation signals.

For DUAL = 0, the commutation signals are derived

from the sine input period and are repeated after 1 to 8

fractions of the sine period.

For DUAL = 1, the commutation signals are derived

from 2 sine input periods and are unique together with

the digital word at the input of channel 0. The commu-

tation signals are repeated after 1 to 8 fractions of two

sine periods.

POLES

Addr. 0x25, bit 6:4

Code

Motor Pole Count

UVW Output

0x0

2 poles

1 cpr*, length 360°

0x1

4 poles

2 cpr, length 180°

0x2

6 poles

3 cpr, length 120°

0x3

8 poles

4 cpr, length 90°

0x4

10 poles

5 cpr, length 72°

0x5

12 poles

6 cpr, length 60°

0x6

14 poles

7 cpr, length 51.43°

0x7

16 poles

8 cpr, length 45°

Notes

*) Cycles per revolution with input of 1 sin/cos period

per mechanical revolution using DUAL = 0.

The setting of POLES is only relevant in UVW Mode

(MODE = 0x0E).

Table 52: Pole Count for Commutation Signals

Figure 19 shows the commutation sequence for a motor

with 6 pole pairs. Here, a commutation sequence span-

ning an angle of φ360UVW repeats itself 6 times within

one mechanical revolution of the motor’s rotor. The

phase shift between the commutation signals is 120°

related to one signal cycle (360°).

120uvw

0°

60°

120°

360°

300°

360uvw

mech

Figure 19: Example of UVW commutation signals.

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