DRV10987 Datasheet, PDF (27/69 Pages) Texas Instruments – DRV10987 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

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DRV10987
SLVSE89 – AUGUST 2017
S1
S3
S5
U1
M
S2
S4
S6
S1
S3
S5
U1
M
S2
S4
S6
Driving
Hi-Z (Tri-State)
Figure 18. IPD Release Mode 1
8.4.3.5.2.3 IPD Advance Angle
After the initial position is detected, the DRV10987 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 19).
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 19. 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 DRV10987 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 4 lists the configuration options that can be set in the register to optimize the initial motor acceleration
stage for different applications.
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