DRV10983-Q1 Datasheet, PDF (27/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

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DRV10983-Q1
SLVSD14 – JUNE 2017
S1
S3
S5
U1
M
S2
S4
S6
S1
S3
S5
U1
M
S2
S4
S6
Driving
Hi-Z (Tri-State)
Figure 19. IPD Release Mode 1
8.4.3.5.2.3 IPD Advance Angle
After the initial position is detected, the DRV10983-Q1 device begins driving the motor at an angle specified by
IPDAdvcAgl[1:0].
Advancing the drive angle anywhere from 0° to 180° results in positive torque. Advancing the drive angle by 90°
results in maximum initial torque. Applying maximum initial torque could result in uneven acceleration to the rotor.
Select the IPDAdvcAgl[1:0] to allow for smooth acceleration in the application (see Figure 20).
Motor spinning direction
U
V
N
S
W
U
V
N
U
V
N
U
V
N
U
V
N
S
W
Û DGYDQFH
S
S
W
W
Û advance
Û DGYDQFH
Figure 20. IPD Advance Angle
S
W
Û DGYDQFH
8.4.3.5.3 Motor Start
After it is determined that the motor is stationary and after completing the motor initialization with either align or
IPD, the DRV10983-Q1 device begins to accelerate the motor. This acceleration is accomplished by applying a
voltage determined by the open-loop current setting (OpenLCurr[1:0]) to the appropriate drive state and by
increasing the rate of commutation without regard to the real position of the motor (referred to as open-loop
operation). The function of the open-loop operation is to drive the motor to a minimum speed so that the motor
generates sufficient BEMF to allow the commutation control logic to accurately drive the motor.
Table 5 lists the configuration options that can be set in register to optimize the initial motor acceleration stage
for different applications.
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