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DRV10963 Datasheet(PDF) 13 Page - Texas Instruments

Part No. DRV10963
Description  DRV10963 5-V, Three-Phase, Sensorless BLDC Motor Driver
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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DRV10963 Datasheet(HTML) 13 Page - Texas Instruments

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SLAS955A – MARCH 2013 – REVISED JULY 2015 Lock1: Frequency Overflow
For most applications the maximum electrical frequency of the motor will be less than 3 kHz. If the motor is
stopped then the BEMF voltage will be zero. Under this condition, when the DRV10963 device is in the closed
loop mode, the sensor less control algorithm will continue to accelerate the electrical commutation rate even
though the motor is not spinning. A lock condition is triggered if the electrical frequency exceeds 3 kHz. Lock2: BEMF Abnormal
For any specific motor, the integrated value of BEMF during half of an electronic cycle will be a constant as
illustrated by the shaded green area in Figure 10. This is true regardless of whether the motor runs fast or slow.
The DRV10963 monitors this value and uses it as a criterion to determine if the motor is in a lock condition.
The DRV10963 uses the integrated BEMF to determine the Kt value of the motor during the initial motor start.
Based on this measurement a range of acceptable Kt values is established. This range is referred to as Kt_low
and Kt_high. During closed loop motor operation the Ktc value is continuously updated. If the calculated Ktc goes
beyond the acceptable range a lock condition is triggered. This is illustrated in Figure 11.
Figure 10. BEMF Integration
Figure 11. Abnormal Kt Lock Detect Lock3: Speed Abnormal
If the motor is in normal operation the motor BEMF will always be less than the voltage applied to the phase. The
DRV10963 sensorless control algorithm 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 higher than
the applied voltage (U) for a certain period of time (TON_LOCK) then there is an error in the system. 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 detect is triggered.
Figure 12. BEMF Monitoring
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