DRV10983ZPWPR datasheet(28/58 Pages) TI1

28 / 58 page

Speed command

input

Speed command

after closed loop

accelerate buffer

Closed loop

accelerate settings

Buffer of

SpdCtrl[8]

SpdCtrl [7:0]

Write to

SpeedCtrl2

Write to

SpeedCtrl1

Speed Command

DRV10983

SLVSCP6C – JULY 2014 – REVISED MAY 2016

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Figure 23. I2C Mode Speed Control

9.4.5.5 Closed Loop Accelerate

To prevent sudden changes in the torque applied to the motor which could result in acoustic noise, the

DRV10983 provides the option of limiting the maximum rate at which the speed command changes.

ClsLpAccel[2:0] can be programmed to set the maximum rate at which the speed command changes (shown in

Figure 24).

Figure 24. Closed Loop Accelerate

9.4.5.6 Control Coefficient

The DRV10983 continuously measures the motor current and uses this information to control the drive state of

the motor when operating in closed loop mode. In applications where noise makes it difficult to control the

commutation optimally, the CtrlCoef[1:0] can be used to attenuate the feedback used for closed loop control. The

loop will be less reactive to the noise on the feedback and provide for a smoother output.

9.4.5.7 Commutation Control Advance Angle

To achieve the best efficiency, it is often desirable to control the drive state of the motor so that the motor’s

phase current is aligned with the motor’s BEMF voltage.

To align the motor’s phase current with the motor’s BEMF voltage, consider the inductive effect of the motor. The

voltage applied to the motor should be applied in advance of the motor’s BEMF voltage (see Figure 25). The

DRV10983 provides configuration bits for controlling the time (tadv) between the driving voltage and BEMF.

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 the tadv until the minimum current is

achieved.

DRV10983ZPWPR Datasheet(PDF) 28 Page - Texas Instruments

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