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What are the benefits of lead angle control?

Generally, lead angle control is used to improve the efficiency of a brushless DC motor. Since DC motors have no saliency (Ld=Lq), they exhibit the maximum efficiency when the back-EMF phase matches the motor current phase. In reality, however, the motor current lags behind the commutation voltage, reducing motor efficiency. Lead angle control reduces the difference in phase between the back-EMF voltage and the motor current.

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