DRV10983-Q1 Datasheet, PDF (20/72 Pages) Texas Instruments – Automotive, Three-Phase, Sensorless BLDC Motor Driver

DRV10983-Q1
SLVSD14 – JUNE 2017
Kt[6:0] {KtShift[2:0],
KtValue[3:0]}
BINARY
HEX
000 0000
0x00
000 0001
0x01
000 0010
0x02
000 0011
0x03
000 0100
0x04
000 0101
0x05
000 0110
0x06
000 0111
0x07
000 1000
0x08
000 1001
0x09
000 1010
0x0A
000 1011
0x0B
000 1100
0x0C
000 1101
0x0D
000 1110
0x0E
000 1111
0x0F
001 1000
0x18
001 1001
0x19
001 1010
0x1A
001 1011
0x1B
001 1100
0x1C
001 1101
0x1D
001 1110
0x1E
001 1111
0x1F
Table 4. Motor Velocity Constant Look-Up Table
Kt_PH
(mV/Hz)
0
0.92
1.84
2.76
3.68
4.6
5.52
6.44
7.36
8.28
9.2
10.12
11.04
11.96
12.88
13.8
14.72
16.56
18.4
20.24
22.08
23.92
25.76
27.6
Kt [6:0] {KtShift[2:0],
KtValue[3:0]}
BINARY
HEX
010 1000
0x28
010 1000
0x29
010 1000
0x2A
010 1000
0x2B
010 1000
0x2C
010 1000
0x2D
010 1000
0x2E
010 1000
0x2F
011 1000
0x38
011 1000
0x39
011 1000
0x3A
011 1000
0x3B
011 1000
0x3C
011 1000
0x3D
011 1000
0x3E
011 1000
0x3F
100 1000
0x48
100 1000
0x49
100 1000
0x4A
100 1000
0x4B
100 1000
0x4C
100 1000
0x4D
100 1000
0x4E
100 1000
0x4F
Kt_PH
(mV/Hz)
29.44
33.12
36.8
40.48
44.16
47.84
51.52
55.2
58.88
66.24
73.6
80.96
88.32
95.68
103.04
110.4
117.76
132.48
147.2
161.92
176.64
191.36
206.08
220.8
Kt [6:0] {KtShift[2:0],
KtValue[3:0]}
BINARY
HEX
101 1000
0x58
101 1000
0x59
101 1000
0x5A
101 1000
0x5B
101 1000
0x5C
101 1000
0x5D
101 1000
0x5E
101 1000
0x5F
110 1000
0x68
110 1000
0x69
110 1000
0x6A
110 1000
0x6B
110 1000
0x6C
110 1000
0x6D
110 1000
0x6E
110 1000
0x6F
111 1000
0x78
111 1000
0x79
111 1000
0x7A
111 1000
0x7B
111 1000
0x7C
111 1000
0x7D
111 1000
0x7E
111 1000
0x7F
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Kt_PH
(mV/Hz)
235.52
264.96
294.4
323.84
353.28
382.72
412.16
441.6
471.04
529.92
588.8
647.68
706.56
765.44
824.32
883.2
942.08
1059.84
1177.6
1295.36
1413.12
1530.88
1648.64
1766.4
8.4.2 Starting the Motor Under Different Initial Conditions
The motor can be in one of three states when the DRV10983-Q1 device attempts to begin the start-up process.
The motor may be stationary, or spinning in the forward or reverse directions. The DRV10983-Q1 device
includes a number of features to allow for reliable motor start under all of these conditions. Figure 13 shows the
motor start-up flow for each of the three initial motor states.
8.4.2.1 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-Q1 device 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.
8.4.2.2 Case 2 – Motor is Spinning in the Forward Direction
If the motor is spinning forward with enough velocity, the DRV10983-Q1 device 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.
8.4.2.3 Case 3 – Motor is Spinning in the Reverse Direction
If the motor is spinning in the reverse direction, the DRV10983-Q1 device provides several methods to convert it
back to the forward direction.
20
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