2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551) · 2005 · 16 citations · 3 references
EngineeringElectrical EngineeringElectric MachinesPower ElectronicsBrushless Dc MachinesElectric DrivesElectric Motor Drive SystemsElectric Motor DrivesElectric MotorsBrushless Dc Motor DrivesBrushless Direct Current MachinesBrushless Direct Current Motor DrivesBrushless Direct Current MotorsMotor Drive InvertersMotor Drive Power Electronics
The BLDCM (brushless DC motor) with trapezoidal back-EMF (electromotive force) waveform is increasingly used. When the motor runs in the 120/spl deg/ conduction mode, two of the three phases are active and the rest phase is inactive at all times in principle. However, a ripple current occurs in the inactive phase due to the diode freewheeling during the noncommutation period in the traditional PWM methods, which aggravates the torque ripples. A new PWM method is proposed in the paper to eliminate the diode freewheeling during the noncommutation period in the inactive phase. As a result, the torque ripple is suppressed using the proposed method. The simulation and experimental results are demonstrated to verify the validity of the proposed PWM method.
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