scholarly journals A Novel SHMPWM Technique for Sensorless Control in High-Power PMSM

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Yanjun Yu ◽  
Lixiao Gao ◽  
Yue Liu ◽  
Feng Chai ◽  
Shukang Cheng
Keyword(s):  
High Power ◽  
Sensorless Control ◽  
Transcendental Equation ◽  
Switching Frequency ◽  
Band Pass Filter ◽  
Harmonic Suppression ◽  
The Novel ◽  
Pass Filter ◽  
Rotor Position ◽  
Harmonic Signals

In view of the low switching frequency restriction of high-power permanent magnet synchronous motor (PMSM) drive system and longing for sensorless control in hostile conditions, a novel PWM control scheme, born out of selective harmonic mitigation pulse width modulation (SHMPWM) technique, was proposed for sensorless control of high-power PMSM. A new enhanced constraint was placed on the traditional SHMPWM nonlinear transcendental equation to selectively generate constant amount of a certain3k+1order harmonic signals while guaranteed that the undesired harmonic signals can be suppressed. At the same time, the3k+1order harmonic signals were extracted by band-pass filter, which had the constant amplitude and phase angle difference of 120°, equivalent to inject rotating voltage vector in the natural coordinate system of motor, and the rotor position can be estimated using the3k+1order harmonic signals. The nonlinear transcendental equation of the novel modulation technique had been designed, and its numerical method had been analyzed. The rotor position observer had been designed according to the3k+1order harmonic signals. Simulation results verify that the harmonic suppression of the system was implemented, and the sensorless control was efficient by the novel SHMPWM technique.

scholarly journals High Frequency Square-Wave Voltage Injection Scheme-Based Position Sensorless Control of IPMSM in the Low- and Zero- Speed Range

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4776
Author(s):  
Shuang Wang ◽  
Jianfei Zhao ◽  
Kang Yang
Keyword(s):  
High Frequency ◽  
Sensorless Control ◽  
Magnetic Polarity ◽  
Position Estimation ◽  
Estimation Accuracy ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Square Wave ◽  
Rotor Position ◽  
Rotor Position Estimation

In this paper, a new sensorless control scheme with the injection of a high-frequency square-wave voltage of an interior permanent-magnet synchronous motor (IPMSM) at low- and zero-speed operation is proposed. Conventional schemes may face the problems of obvious current sampling noise and slow identification in the process of magnetic polarity detection at zero speed operation, and the effects of inverter voltage error on the rotor position estimation accuracy at low speed operation. Based on the principle analysis of d-axis magnetic circuit characteristics, a method for determining the direction of magnetic polarity of d-axis two-opposite DC voltage offset by uninterruptible square-wave injection is proposed, which is fast in convergence rate of magnetic polarity detection and more distinct. In addition, the strategy injects a two-opposite high-frequency square-wave voltage vectors other than the one voltage vector into the estimated synchronous reference frame (SRF), which can reduce the effects of inverter voltage error on the rotor position estimation accuracy. With this approach, low-pass filter (LPF) and band-pass filter (BPF), which are used to obtain the fundamental current component and high-frequency current response with rotor position information respectively in the conventional sensorless control, are removed to simplify the signal process for estimating the rotor position and further improve control bandwidth. Finally, the experimental results on an IPMSM drive platform indicate that the rotor position with good steady state and dynamic performance can be obtained accurately at low-and zero-speed operation with the sensorless control strategy.

scholarly journals Multi-harmonic Suppression Band-Pass Filter for Communication System

ETRI Journal ◽  
2007 ◽  
Vol 29 (4) ◽  
pp. 533-535 ◽  
Author(s):  
Wenmei Zhang ◽  
Liping Han ◽  
Runbo Ma ◽  
Junfa Mao
Keyword(s):  
Communication System ◽  
Band Pass Filter ◽  
Harmonic Suppression ◽  
Pass Filter ◽  
Band Pass

A Novel Three-Port Combiner Based on Coaxial Cavity

2012 ◽  
Vol 605-607 ◽  
pp. 1924-1928
Author(s):  
Su Nan Zhang ◽  
Qiang Ye ◽  
Chang Wei Luo
Keyword(s):  
Return Loss ◽  
Ultra Wideband ◽  
Band Pass Filter ◽  
The Novel ◽  
Pass Filter ◽  
Coaxial Cavity ◽  
Transmission Zero ◽  
Band Stop Filter ◽  
Band Pass ◽  
Good Agreement

In this paper, a novel three-port combiner based on coaxial cavity is presented, which consists of a band-pass filter with a transmission zero and a ultra-wideband band-stop filter, and the combiner is different to the conventional combiner based on microstrip or stripline. The design and simulated results show that the novel combiner has a good performance, which are insert loss more than -0.5dB and return loss less than -20dB between the GSM/DCS/TD band (800-2170MHz) and WLAN band (2400-2500MHz), the isolation in both bands less than -85dB, respectively. In addition, the performances of the novel combiner are demonstrated experimentally, the measured results have good agreement with simulated results.

A highly selective UWB bandpass filter using stepped impedance stubs

2018 ◽  
Vol 10 (3) ◽  
pp. 301-307 ◽  
Author(s):  
Minjae Jung ◽  
Byung-Wook Min
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Stop Band ◽  
Ultra Wideband ◽  
Pass Band ◽  
Band Pass Filter ◽  
The Novel ◽  
Pass Filter ◽  
Radial Stub ◽  
Band Pass

AbstractWe present a new ultra-wideband (UWB) band-pass filter (BPF) configuration with a stepped impedance short-circuited stub (SISS)-loaded triple-mode resonator (TMR) and stepped impedance radial stub (SIRS). The novel SISS-loaded TMR and SIRS improve the roll-off ratio at both ends. Even though this UWB BPF is based on a single resonator, the measured results show excellent in-band performance with a small insertion loss less than 0.6 dB and return loss greater than −16 dB. The proposed UWB BPF has sharp roll-off ratio of 96 and 43 dB/GHz, respectively, at the lower and upper edges of the pass-band, and a wide stop-band from 10.8 to 15.6 GHz with the rejection greater than 20 dB.

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