SLVUB95C December 2017 – August 2018 DRV10974
The RMP resistor controls the open-loop start-up acceleration, closed-loop acceleration, and closed-loop deceleration. More information can be found in DRV10974 12-V, Three-Phase, Sensorless BLDC Motor Driver. The default resistor on the DRV10974EVM is 7.32 kΩ, which sets the second-order acceleration coefficient, the first-order acceleration coefficient, the closed-loop acceleration, and the closed-loop deceleration to 0.22 Hz/s2, 4.6 Hz/s, 2.7 s, and 44 s, respectively. This is the slowest ramp rate.
| RMP SELECTION | RRMP [kΩ] | ACCEL2 [Hz/s2] | ACCEL1 [Hz/s] | CLOSED-LOOP-ACCELERATION TRANSITION TIME [s] | CLOSED-LOOP-DECELERATION TRANSITION TIME [s] |
|---|---|---|---|---|---|
| 0 | 7.32 | 0.22 | 4.6 | 2.7 | 44 |
| 1 | 10.7 | 1.65 | 9.2 | 2.7 | 22 |
| 2 | 14.3 | 1.65 | 15 | 1 | 22 |
| 3 | 17.8 | 3.3 | 25 | 1 | 11 |
| 4 | 22.1 | 7 | 25 | 0.2 | 44 |
| 5 | 28 | 7 | 35 | 0.2 | 22 |
| 6 | 34 | 14 | 50 | 0.2 | 22 |
| 7 | 41.2 | 27 | 75 | 0.2 | 11 |
| 8 | 49.9 | 27 | 75 | 5.4 | 11 |
| 9 | 59 | 14 | 50 | 8 | 22 |
| 10 | 71.5 | 7 | 35 | 11 | 22 |
| 11 | 86.6 | 7 | 25 | 22 | 44 |
| 12 | 105 | 3.3 | 25 | 5.4 | 11 |
| 13 | 124 | 1.65 | 15 | 8 | 22 |
| 14 | 150 | 1.65 | 9.2 | 11 | 22 |
| 15 | 182 | 0.22 | 4.6 | 22 | 44 |