Harmonic Spectra Shaping for Switched Reluctance Motor with Asymmetric-Carrier Random PWM
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Harmonic Spectra Shaping for Switched Reluctance Motor with Asymmetric-Carrier Random PWM Jia-jun Wang1
Received: 11 March 2017 / Revised: 20 July 2017 / Accepted: 7 August 2017 © Brazilian Society for Automatics–SBA 2017
Abstract To alleviate the undesirable vibration and acoustic noise of switched reluctance motor (SRM), an asymmetriccarrier random PWM (ACRPWM) method is designed to shape the harmonic spectra for the speed control of the SRM. The ACRPWM can not only effectively spread the harmonic spectra of the voltage to a more wide frequency range, but also maintain the fixed switching frequency in the control of the converter. The shaping of the harmonic spectra can reduce the harmonic components beside the switching frequency and its integer multiples. The harmonic spread factor and total harmonic distortion are used to evaluate the performance of the ACRPWM. The ACRPWM is tested on hard and soft switching modes of the converter in the speed control of the SRM, respectively. Simulation results certify the effectiveness of the proposed ACRPWM in the shaping of the harmonic spectra for the SRM. Keywords Switched reluctance motor · Asymmetric-carrier random PWM · Harmonic spectrum shaping · Harmonic spread factor · Total harmonic distortion
1 Introduction Switching reluctance motor (SRM) is one type of the oldest motor and can be traced back to the nineteenth century (Miller 2000; Krishnan 2001; Tursini et al. 2017). SRM was ignored for a long time due to the lagging development of the
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Jia-jun Wang [email protected] School of Automation, Hangzhou Dianzi University, Hangzhou 310018, Zhejiang, People’s Republic of China
power electronics which confined the control performance of the SRM. The development of the power electronics and control technology reactivated the enthusiasm of the researchers reconsidering the application of the SRMs (Dos Santos et al. 2014; Ye et al. 2015; Li and Shamsi 2016). There are no windings or permanent magnet in the rotor, which makes the SRM own some excellent performance that is difficult to be achieved for permanent magnet synchronous motor (PMSM) and induction motor (IM). The SRM has become a strong contender in the industrial driving field at present. The doubly salient structure and switching operation mode make the SRM exhibit large vibration and acoustic noise (Anwar and Husain 2000; Anwar et al. 2003). Large acoustic noise generated in the SRM is the major detriment, which hinders the application of the SRM in many areas. It is essential to find the effective measure to reduce the vibration and acoustic noise. At present, the existing solutions for vibration and acoustic noise reduction for the SRM can be achieved via the SRM design (Anwar and Husain 2000; Anwar et al. 2003; Li and Cho 2009; Kiyota et al. 2016; Asgar and Afjei 2016) or the active control (Pollock and Wu 1997; Bayless et al. 2016; Kurihara et al. 2016; Long et al. 2005; Zhu et al. 2011). The vibration and acoustic noise have direct relation with the magnetic radial force and circumferential mode
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