DRV10983-Q1 Datasheet, PDF (32/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

DRV10983-Q1
SLVSD14 – JUNE 2017
www.ti.com
For motors with salient pole structures, aligning the motor BEMF voltage with the motor current may not achieve
the best efficiency. In these applications, the timing advance should be adjusted accordingly. Accomplish this by
operating the system at constant speed and load conditions and by adjusting t_adv until the minimum current is
achieved.
Phase
Voltage
Phase
Current
Phase
BEMF
t_adv
Figure 28. Advance Time (t_adv) Definition
The DRV10983-Q1 device has two options for adjusting the motor commutate advance time. When
CommAdvMode = 0, mode 0 is selected. When CommAdvMode = 1, mode 1 is selected.
Mode 0: t_adv is maintained to be a fixed time relative to the estimated BEMF zero cross as determined by
Equation 5.
t_adv = t_SETTING
(5)
Mode 1: t_adv is maintained to be a variable time relative to the estimated BEMF zero cross as determined by
Equation 6.
t_adv = t_SETTING × (U - BEMF) / U.
where
• U is the phase voltage amplitude
• BEMF is phase BEMF amplitude
(6)
t_SETTING (in µs) is determined by the configuration of the TCtrlAdvShift [2:0] and TCtrlAdvValue [3:0] bits as
defined in Equation 7. For convenience, the available t_SETTING values are provided in Table 6.
t_SETTING = 2.5 µs × [TCtrlAdvValue[3:0]] << TCtrlAdvShift[2:0]
(7)
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