Brushless DC drives incorporating motors with permanent-magnetnexcitation are being used in a rapidly-expanding range of applications,nincluding the computer peripheral, automotive and machine toolnindustries. The overall dynamic torque producing capability of the drivenis critically dependent on the interaction between the motor and powernswitching circuit. The authors examine various power circuitnconfigurations and discuss their comparative merits, paying particularnattention to the trade-offs between circuit complexity and overall drivenperformance
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