Techniques of PWM space vector modulation for the reduction of magnetic acoustic noise in traction motor

A new passive methodology for controlling the noise in electrical machines: Impact of some parameters on the modal analysis

“…There are some modifications like the width teeth and the length stator, that ensure a same trend shifting for all the modal frequencies (all the frequencies became greater or lower). In this way it is possible to shift also all the radiation frequencies in order to avoid sound power radiation far from the good sensitive region of the human auditory system (2)(3)(4)(5). Figure 12 shows the deformation shape of the 33 th mode for the rectangular cage: this mode is the one with a big reduction of the frequency value of the initial structure and it is clear that the least deformed part is the cage.…”

“…Also [4] proposes several control schemes for reducing the torque ripple for abating vibrations due to local forces on the teeth, but it needs a difficult tuning of the controller parameters for a suitable reduction over a wide range of mechanical loads and rotation speeds. Another strategy is used in [5], which presents a mixed random modulation technique for the reduction of the magnetic acoustic noise, but, like several similar works, it is not able to mitigate the noise coming from other noise sources, like mechanical or aerodynamic ones.…”

Study of Excitation Characteristics of Traction Machine/Drive Systems

“…Considering the actual control environment, in which the motor windings are connected to the inverter and excited by the voltage source, the space vector pulse width modulation (SVPWM) technique is thus employed among various modulation techniques, due to its superior performance in bus voltage utilization and overall efficiency [8][9][10]. Current harmonics generated by pulse width modulation (PWM) cannot be ignored when using an SVPWM control strategy because it leads to the increase of the losses, torque ripple, vibration, and noises [11][12][13][14][15][16][17]. In particular, in [11,12], it is shown that the eddy-current loss of the magnets increases significantly, caused by high-order carrier harmonics of the inverter, bringing the risk of irreversible demagnetization of the magnets.…”

“…In [15], the EV motor driven by an inverter has a large PWM carrier harmonic iron loss in the low-torque region. References [16,17] show that the electromagnetic noise derives mainly from the electromagnetic force, caused by the component in the current harmonics under PWM. Hence, current harmonics of the excitation sources must be included to increase the accuracy of the model of the motor drive system.…”

An Improved Sideband Current Harmonic Model of Interior PMSM Drive by Considering Magnetic Saturation and Cross-Coupling Effects

“…These analytical studies have been mainly concentrated on the derivation of sideband voltage harmonics by using various methods [11]- [14], while the analytical derivations of the sideband current harmonic related coefficients, such as harmonic distortion rate [15], peak ripple value [16], and flux harmonic distortion factor [17], [18] have also been developed in the literature. Meanwhile, various methods such as special switching sequence [19], [20], multilevel inverter topologies [21], [22], and random pulse width [23], have been introduced to mitigate the sideband harmonic components in the drive systems with SVPWM technique.…”