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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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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.