поискавой системы для электроныых деталей |
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DRV10974 датащи(PDF) 14 Page - Texas Instruments |
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DRV10974 датащи(HTML) 14 Page - Texas Instruments |
14 / 29 page 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 |
Аналогичный номер детали - DRV10974 |
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Аналогичное описание - DRV10974 |
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