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DRV10974 датащи(PDF) 14 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) 14 Page - Texas Instruments

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VU
BEMF = Kt × speed
M
Rm
U
V
If speed >
Kt
Lock is triggered
Kt
Kt_high
Kt_low
Ktc
Lock detect
time
Kt
14
DRV10974
SLVSDN2 – JANUARY 2018
www.ti.com
Product Folder Links: DRV10974
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
Figure 10. BEMF Integration
Figure 11. Abnormal Kt Lock Detect
7.3.4.5 Lock Closed Loop Abnormal
This lock condition is active when the DRV10974 device is operating in the closed-loop mode. The motor is
indicated as not moving when the closed-loop commutation period becomes lower than half the previous
commutation period. This condition triggers the closed-loop abnormal-lock condition.
7.3.4.6 Lock Speed Abnormal
If the motor is in normal operation, the motor BEMF is always less than the voltage applied to the phase. The
sensorless-control algorithm of the DRV10974 device is continuously updating the value of the motor BEMF
based on the speed of the motor and the motor Kt as shown in Figure 12. If the calculated value for motor BEMF
is 1.5 times higher than the applied voltage on phase U (VU) for an electrical period then an error is present in
the system, and the calculated value for motor BEMF is wrong or the motor is out of phase with the commutation
logic. When this condition is detected, a lock is triggered.
Figure 12. BEMF Monitoring


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