scholarly journals Comparative Evaluation of a Permanent Magnet Machine Saliency-Based Drive with Sine-Wave and Square-Wave Voltage Injection

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2189 ◽  
Author(s):  
Jyun-You Chen ◽  
Shih-Chin Yang ◽  
Kai-Hsiang Tu
Keyword(s):  
Permanent Magnet ◽  
Pulse Width Modulation ◽  
Dead Time ◽  
Sine Wave ◽  
Position Estimation ◽  
Feedback Signal ◽  
Estimation Errors ◽  
Square Wave ◽  
Position Errors ◽  
Voltage Signal

This paper improves a permanent magnet (PM) machine saliency-based drive performance based on the selection of a suitable injection signal. For the saliency-based position estimation, a persistently high-frequency (HF) voltage signal is injected to obtain a measurable spatial saliency feedback signal. The injection signal can be sine-wave or square-wave alternating current (AC) voltage manipulated by the inverter’s pulse width modulation (PWM). Due to the PWM dead-time effect, these HF voltage injection signals might be distorted, leading to secondary harmonics on the saliency signal. In addition, the flux saturation in machine rotors also results in other saliency harmonics. These nonlinear attributes cause position estimation errors on saliency-based drives. In this paper, two different voltage signals are analyzed to find a suited voltage which is less sensitive to these nonlinear attributes. Considering the inverter dead-time, a sine-wave voltage signal reduces its influence on the saliency signal. By contrast, the flux saturation causes the same amount of error on two injection signals. Analytical equations are developed to investigate position errors caused by the dead-time and flux saturation. An interior PM machine with the saliency ratio of 1.41 is tested for the experimental verification.

Optimization of Permanent Magnet Structure Parameters in Tubular Permanent Magnet Synchronous Linear Motor for HF Square-Wave Injection Sensorless Algorithm

2021 ◽  
Author(s):  
Luhong Zhang ◽  
Bingran Li ◽  
Chunlei Zhang ◽  
Hui Zhang ◽  
Peiqing Ye
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Linear Motor ◽  
Position Estimation ◽  
Estimation Accuracy ◽  
Switching Frequency ◽  
Structure Parameters ◽  
Distribution Law ◽  
Square Wave ◽  
Stationary Reference Frame

Abstract The high frequency (HF) square-wave injection sensorless algorithm uses saliency to estimate the motor position affected by the inductance. The structure of the permanent magnets will affect the inductance of the motor, then affect the position estimation performance of the sensorless algorithm. This paper studies the relationship between the inductance and the position estimation accuracy of the HF square-wave injection sensorless algorithm for tubular permanent magnet synchronous linear motor (TPMSLM). Through the finite element simulation, the distribution law of the TPMSLM inductance with the change of the PM structure is quantitatively analyzed, and the influence of the PM structure parameters on the differential amplitude of the HF current is given. The HF square-wave voltage is injected into the stationary reference frame, and the frequency is half of the PWM switching frequency. The HF current differential equation is obtained without any filter, and the estimated position of the mover is extracted by a phase-locked loop. Finally, the experiment of sensorless position estimation is carried out by two prototypes with different PM structure parameters at different speeds, verifying the effectiveness of the analysis.

Stable V/F Control of Open Winding Surface Mounted Permanent Magnet Synchronous Motor Drives with SPWM Strategy

2014 ◽  
Vol 1039 ◽  
pp. 353-360
Author(s):  
Yu Ning ◽  
Su Rong Huang ◽  
Jin Gao ◽  
You Min Gong
Keyword(s):  
Permanent Magnet ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Permanent Magnet Synchronous Motor ◽  
Sine Wave ◽  
Synchronous Motor ◽  
Motor Drives ◽  
Drive System ◽  
Loop Control ◽  
Inverter Power Supply

This paper presents dual inverter power supply open-end winding of surface mounted permanent magnet synchronous motor (OW-SPMSM) drive system for fans and pumps energy saving by V/f control. On the principle of OW-SPMSM drive system, this paper puts forward a unified Sine wave pulse width modulation strategy (SPWM) of dual inverter, which is easy to real time implementation for the calculation of this method is less than SVPWM, its performance is as good as the SVPWM in terms of harmonic power balance. Accordingly, a power factor closed loop control was introduced into the drive system to achieve stable volts/hertz (V/F) control. The system simulation model was investigated in detail; its results show that the proposed drive system has greatly improved the system dynamic performance.

scholarly journals Hardware implementation of single phase three-level cascaded h-bridge multilevel inverter using sinusoidal pulse width modulation

2019 ◽  
Vol 10 (2) ◽  
pp. 625
Author(s):  
A. Shamsul Rahimi A. Subki ◽  
Mohd Zaidi Mohd Tumari ◽  
Wan Norhisyam Abd Rashid ◽  
Aiman Zakwan Jidin ◽  
Ahmad Nizammuddin Muhammad Mustafa
Keyword(s):  
Pulse Width ◽  
Output Voltage ◽  
Single Phase ◽  
Hardware Implementation ◽  
Pulse Width Modulation ◽  
Sine Wave ◽  
Multilevel Inverter ◽  
Square Wave ◽  
Output Waveform ◽  
Sinusoidal Pulse Width Modulation

<span lang="EN-US">In this paper a hardware implementation of single-phase cascaded H-bridge three level multilevel inverter (MLI) using sinusoidal pulse width modulation (SPWM) is presented. There are a few interesting features of using this configuration, where less component count, less switching losses, and improved output voltage/current waveform. The output of power inverter consists of three form, that is, square wave, modified square wave and pure sine wave. The pure sine wave and modified square wave are more expensive than square wave. The focus paper is to generate a PWM signal which control the switching of MOSFET power semiconductor. The sine wave can be created by using the concept of Schmitt-Trigger oscillator and low-pass filter topology followed by half of the waveform will be eliminated by using the circuit of precision half-wave rectifier. Waveform was inverted with 180º by circuit of inverting op-amp amplifier in order to compare saw-tooth waveform. Two of PWM signal were produced by circuit of PWM and used digital inverter to invert the two PWM signal before this PWM signal will be passed to 2 MOSFET driver and a 3-level output waveform with 45 Hz was produced. As a conclusion, a 3-level output waveform is produced with output voltage and current recorded at 22.5 Vrms and 4.5 Arms. The value of measured resistance is 0.015 Ω that cause voltage drop around 0.043 V. Based on the result obtained, the power for designed inverter is around 100W and efficiency recorded at 75%.</span>

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