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Periodic Carrier Frequency Modulation in Reducing Low-Frequency Electromagnetic Interference of Permanent Magnet Synchronous Motor Drive System IEEE TRANSACTIONS ON MAGNETICS, VOL. 51, NO. 11, NOVEMBER 2015 Adviser ：王明賢 Postgraduate：張正賢 Outline • ABSTRACT • INTRODUCTION • COMMON MODE CONDUCTED EMI MODEL • SIMULATIONS • EXPERIMENTS • CONCLUSION • REFERENCES ABSTRACT • The EMI of PMSM, which results from the switch of power device, generates undesirable effects on the control system. • it is of importance to reduce the EMI of PMSM. The common mode (CM) conducted EMI model of the PMSM drive system is constructed to investigate the CM voltage. • The simulations and experiments of PMSM fed by the fixed frequency PWM (FFPWM) and PCFM are implemented to analyze the CM conducted EMI. INTRODUCTION • Permanent magnet synchronous motors (PMSMs) have been widely employed in home appliances, medical instruments, and vehicles because of their various advantages such as the high power density, high efficiency, small size, and simple structure. • PMSMs are usually fed by pulsewidth modulation (PWM) inverters, whose power devices operate in switch states. The switch of power devices results in the electromagnetic interference (EMI). • The EMI is a challenging problem for the motor drive system fed by PWM inverter due to the fact that the EMI noise generates undesirable effects on the control system such as the communication errors. INTRODUCTION • In the literature, a set of methods have been used to reduce the EMI of power converters, such as filtering, shielding, grounding, isolation, separation, and the orientation. • However, the passive filters and shielding may increase the significant cost and weight to power electronics systems. Spread spectrum clock generation (SSCG) can suppress the EMI of power converters without increasing the cost and weight. • As a kind of SSCG, the periodic carrier frequency modulation (PCFM) was used to diminish the EMI of dc/dc power converters. Common mode conducted EMI model Common mode (CM) conducted EMI model parameters(1) • The common mode (CM) conducted EMI model of PMSM drive systems • The parameters in Fig. 1 are designated as follows : RCM = 1 /( 3RS ) (1) LCM = 1 / 6 ( Lsd + Lsq ) • where RS is the phase resistance of the motor, Lsd and Lsq are the direct axis and quadrature axis inductances, respectively. • CCM is the CM stray capacitor between motor windings and motor frame. • CS is the stray capacitor across phase windings. • C is the filter capacitor of rectifier bridge. Common mode (CM) conducted EMI model parameters(2) • LC and RC are the parasitic inductance and parasitic resistance of rectifier bridge filter capacitor, respectively. • Cp1 is the parasitic capacitor between inverter collector of the upper bridge and ground. • Cp2 is the parasitic capacitor between inverter emitter of the lower bridge and ground. • Cp is the parasitic capacitor between inverter midpoint of the bridge arm and ground. • The CM voltage in Fig. 1 can be expressed as follows : VCM = ( V1 + V2 )/ 2 (3) • where V1 and V2 are the voltages across the two resistances of line impedance stabilization network, respectively. TABLE I • According to the impedance tests of PMSM, inverter and the parameters of PMSM, as shown in Table I, the characteristics in Fig. 1 are verified and thereafter shown in Table II. TABLE II SIMULATIONS • Simulations of PMSM fed by the fixed frequency PWM (FFPWM) and PCFM are implemented to investigate the effect of PCFM on the CM conducted EMI. • The power supply is 220 V/50 Hz ac voltage in the simulations. In addition, the switching frequency of the FFPWM and the center frequency of the PCFM are both 16 kHz. Common mode voltage spectrums PCFM with different spreading frequency widths Peak amplitudes • the suppression of CM voltage of the PMSM drive system by the sinusoidal and sawtooth PCFM ameliorates with the increase in spreading frequency breadths. • Moreover, the reduction on CM voltage of the PMSM drive system by the sawtooth PCFM is larger than that by the sinusoidal PCFM. EXPERIMENTS • The top line in Fig. 6, as defined by the 15-QP-cond, is the EN55015 quasi-peak value standard. • The peak amplitude of the CM conducted EMI spectra, which emerges near 48 kHz, is 90 dBµV. • Fig. 6(b) and (c), which emerge near 80 kHz, are 81 and 79 dBµV Different spreading frequency widths TABLE III • Experimental results in Table III validate that the peak amplitudes on the CM conducted EMI spectra of PMSM driven by the sinusoidal and sawtooth PCFM decrease as the spreading frequency width increase. CONCLUSION • The sinusoidal and sawtooth PCFM are introduced to reduce the lowfrequency CM conducted EMI of PMSM drive systems in this paper. • Simulation and experimental results validate that the sinusoidal and sawtooth PCFM can effectively reduce the CM conducted EMI. REFERENCES • [1] K.-C. Kim, “A novel calculation method on the current information of vector inverter for interior permanent magnet synchronous motor for electric vehicle,” IEEE Trans. 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