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DRV10974 датащи(PDF) 21 Page - Texas Instruments

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номер детали DRV10974
подробное описание детали  12-V, Three-Phase, Sensorless BLDC Motor Driver
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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DRV10974 датащи(HTML) 21 Page - Texas Instruments

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DRV10974
www.ti.com
SLVSDN2 – JANUARY 2018
Product Folder Links: DRV10974
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
Table 6. Recommend Application Range (continued)
MIN
TYP
MAX
UNIT
Motor phase resistance
Phase to center tap
1
20
Ω
Motor winding current
(rms)
1
A
Absolute maximum
current
During locked condition
2.5
A
8.2.2 Detailed Design Procedure
See the Design Requirements section and make sure your system meets the recommended application range.
The tuning procedure is done sequentially in 4 phase. The 4 phases are given here.
Phase 1 - Find the closed loop current and coasting time.
1. Set ADV to 400 μsec (59 kΩ), CS to 1.4 A (115 kΩ), and RMP to the slowest setting (7.32 kΩ).
2. Apply power to the device to spin the motor to maximum target speed.
3. If the motor fails to spin up reduce the current limit (CS) by one level. Repeat step 3 until the motor
successfully spins up.
4. Record the motor peak phase current during steady state run (Ipeak).
5. Provide a command of 0 and measure the time required for the motor to coast to a stop (tcoast).
6. Based on the coast time (tcoast) the table below provides the order of selection for RMP.
Table 7. RMP Selection Based on Coast Time
tcoast
RMP selection order
Less than 11 s
17.8 kΩ; 41.2 kΩ
11 s to 22 s
10.7 kΩ; 14.3 kΩ; 28 kΩ; 34 kΩ
Greater than 22 s
7.32 kΩ; 22.1 kΩ
Phase 2 - Tune RMP for max speed operation.
1. Apply a current limit (CS) closest to 4 times the peak current (Ipeak)
2. Chose the RMP resistor value based on the measured coast time (tcoast)
3. Start with the smallest valued resistor for RMP in the RMP selection order for the tcoast category (less than 11
s, 11 to 22 s, or greater than 22 s). Record every RMP resistor value that successfully spins the motor.
Phase 3 - Tune RMP for minimum speed operation.
1. Start with the smallest successful RMP resistor value from Phase 2 item 3.
2. Increase the RMP resistor value until failure. Record every RMP setting that successfully spins the motor.
3. If none of the RMP values from Phase 2 are successful: Reduce the current limit (CS) to 3 times the peak
current (Ipeak) and chose the next great tcoast category.
4. For the highest RMP resistor value that passed Phase 2 and Phase 3 vary ADV from the smallest resistor
value to the highest resistor value.
5. Monitor the supply current and the speed of the motor.
6. Select the ADV resistor value that provides the highest speed using the minimum current.


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