DRV10983ZPWPR datasheet(18/58 Pages) TI1

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DRV10983

SLVSCP6C – JULY 2014 – REVISED MAY 2016

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Table 3. Motor Velocity Constant Look-Up Table (continued)

KtPH (mV/Hz)

Kt[6:0]

HEX

KtPH (mV/Hz)

Kt [6:0]

HEX

KtPH (mV/Hz)

Kt [6:0]

HEX

5.5

0000110

55.0

0101111

469

1101000

6.42

0000111

58.7

0111000

528

1101001

7.33

001000

66.0

0111001

587

1101010

8.25

0001001

73.3

0111010

645

1101011

9.17

0001010

80.7

0111011

704

1101100

10.0

0001011

88.0

0111100

763

1101101

11.0

0001100

95.4

0111101

822

1101110

11.9

0001101

102

0111110

880

1101111

12.8

0001110

110

0111111

939

1111000

13.7

0001111

117

1001000

1050

1111001

14.6

0011000

132

1001001

1170

1111010

16.5

0011001

146

1001010

1290

1111011

18.3

0011010

161

1001011

1400

1111100

20.1

0011011

176

1001100

1520

1111101

22.0

0011100

190

1001101

1640

1111110

23.8

0011101

205

1001110

1760

1111111

25.6

0011110

220

1001111

27.5

0011111

234

1011000

29.3

0101000

264

1011001

9.4.2 Starting the Motor under Different Initial Conditions

The motor can be in one of three states when the DRV10983 attempts to begin the start-up process. The motor

may be stationary, or spinning in the forward or reverse directions. The DRV10983 includes a number of features

to allow for reliable motor start under all of these conditions. Figure 9 shows the motor start-up flow for each of

the three initial motor states.

9.4.2.1 Case 1 – Motor is Stationary

If the motor is stationary, the commutation logic must be initialized to be in phase with the position of the motor.

The DRV10983 provides for two options to initialize the commutation logic to the motor position. Initial position

detect (IPD) determines the position of the motor based on the deterministic inductance variation, which is often

present in BLDC motors. The Align and Go technique forces the motor into alignment by applying a voltage

across a particular motor phase to force the motor to rotate in alignment with this phase. The following sections

explain how to configure these techniques for use in the designer's system.

9.4.2.2 Case 2 – Motor is Spinning in the Forward Direction

If the motor is spinning forward with enough velocity, the DRV10983 may be configured to go directly into closed

loop. By resynchronizing to the spinning motor, the user achieves the fastest possible start-up time for this initial

condition.

9.4.2.3 Case 3 – Motor is Spinning in the Reverse Direction

If the motor is spinning in the reverse direction, the DRV10983 provides several methods to convert it back to

forward direction.

One method, reverse drive, allows the motor to be driven so that it accelerates through zero velocity. The motor

achieves the shortest possible spin-up time in systems where the motor is spinning in the reverse direction.

If this feature is not selected, then the DRV10983 may be configured to either wait for the motor to stop spinning

or brake the motor. After the motor has stopped spinning, the motor start-up sequence proceeds as it would for a

motor which is stationary.

Take care when using the feature reverse drive or brake to ensure that the current is limited to an acceptable

level and that the supply voltage does not surge as a result of energy being returned to the power supply.

DRV10983ZPWPR Datasheet(PDF) 18 Page - Texas Instruments

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