DRV10983_15 Datasheet, PDF(16/57 Page) Texas Instruments – DRV10983 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

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DRV10983_15 Datasheet, PDF (16/57 Pages) Texas Instruments – DRV10983 12- to 24-V, Three-Phase, Sensorless BLDC Motor Driver

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DRV10983

SLVSCP6B â JULY 2014 â REVISED FEBRUARY 2015

KtPH (mV/Hz)

5.5

6.42

7.33

8.25

9.17

10.0

11.0

11.9

12.8

13.7

14.6

16.5

18.3

20.1

22.0

23.8

25.6

27.5

29.3

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

Kt[6:0]

0000110

0000111

001000

0001001

0001010

0001011

0001100

0001101

0001110

0001111

0011000

0011001

0011010

0011011

0011100

0011101

0011110

0011111

0101000

HEX

KtPH (mV/Hz)

55.0

58.7

66.0

73.3

80.7

88.0

95.4

102

110

117

132

146

161

176

190

205

220

234

264

Kt [6:0]

0101111

0111000

0111001

0111010

0111011

0111100

0111101

0111110

0111111

1001000

1001001

1001010

1001011

1001100

1001101

1001110

1001111

1011000

1011001

HEX

KtPH (mV/Hz)

469

528

587

645

704

763

822

880

939

1050

1170

1290

1400

1520

1640

1760

Kt [6:0]

1101000

1101001

1101010

1101011

1101100

1101101

1101110

1101111

1111000

1111001

1111010

1111011

1111100

1111101

1111110

1111111

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HEX

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 â 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 â 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 â 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.

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