Datasheet
Phase current control L6480
38/75 DocID023278 Rev 4
Figure 16. Current distortion and compensation
The optimization can be enabled setting high the LSPD_OPT bit in the MIN_SPEED register
(Section 9.1.8 on page 46) and is active in a speed range from zero to MIN_SPEED. When
low speed optimization is enabled, speed profile minimum speed is forced to zero.
7.4 BEMF compensation
Using the speed information, a compensation curve is added to the amplitude of the voltage
waveform applied to the motor winding in order to compensate the BEMF variations during
acceleration and deceleration (see Figure 17).
The compensation curve is approximated by a stacked line with a starting slope (ST_SLP)
when speed is lower than a programmable threshold speed (INT_SPEED) and a fine slope
(FN_SLP_ACC and FN_SLP_DEC) when speed is greater than the threshold speed (see
sections 9.1.11 on page 48, 9.1.12 on page 48, 9.1.13 on page 48 and 9.1.14 on page 49).
,
SKDVH
,
SKDVH
&XUUHQWGLVWRUWLRQLVKHDYLO\
UHGXFHG
:LWKRXWORZVSHHGRSWLPL]D]LRQ
:LWKORZVSHHGRSWLPL]D]LRQ
$0Y