Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990757
Hyeon-Jun Park, H. Lee, Kyo-Beum Lee
This paper proposes improved direct self control (DSC) by using a dual magnet flux frame for open-end winding interior permanent synchronous magnet motor (OEWIPMSM). The conventional DSC has advantages of having fast torque response and low switching frequency due to the magnetic flux and torque being directly controlled by a single flux frame and torque hysteresis controller. However, the magnetic flux ripple, current ripple and torque ripple are large. Since the stator magnetic flux trajectory is formed hexagonal shape in stationary reference frame. In this study, a dual magnetic flux frame is applied to overcome this problem. The proposed DSC reduces stator magnetic flux ripple by forming the magnetic flux trajectory into a dodecagon shape in stationary reference system. To form this magnetic flux trajectory, the voltage vector space is divided into 12 sectors, and switching states are selected through comparing dual magnetic flux frame and reference magnetic flux. The validity and effectiveness of the proposed DSC are verified through simulation results.
{"title":"Direct Self Control for Open-End Winding Interior Permanent Magnet Synchronous Motor using Dual Magnetic Flux Frame","authors":"Hyeon-Jun Park, H. Lee, Kyo-Beum Lee","doi":"10.1109/SCEMS56272.2022.9990757","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990757","url":null,"abstract":"This paper proposes improved direct self control (DSC) by using a dual magnet flux frame for open-end winding interior permanent synchronous magnet motor (OEWIPMSM). The conventional DSC has advantages of having fast torque response and low switching frequency due to the magnetic flux and torque being directly controlled by a single flux frame and torque hysteresis controller. However, the magnetic flux ripple, current ripple and torque ripple are large. Since the stator magnetic flux trajectory is formed hexagonal shape in stationary reference frame. In this study, a dual magnetic flux frame is applied to overcome this problem. The proposed DSC reduces stator magnetic flux ripple by forming the magnetic flux trajectory into a dodecagon shape in stationary reference system. To form this magnetic flux trajectory, the voltage vector space is divided into 12 sectors, and switching states are selected through comparing dual magnetic flux frame and reference magnetic flux. The validity and effectiveness of the proposed DSC are verified through simulation results.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126814699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990731
H. Lee, Kyo-Beum Lee
This paper proposes the open-circuit fault diagnosis and fault-tolerant method of dual inverter with two isolated DC power sources for driving open-end winding permanent magnet synchronous motor (OEW-IPMSM). Since the multi-level effect of the topology, two-level dual inverter (TLDI) has an advantage in that fault-tolerant control which is not allowable in two-level single inverter. From the structural characteristics of TLDI, when an open fault occurs in single switch, there are switch pairs with the identical tendency of the inverter output current. In this paper, the open-circuit fault diagnosis and fault-tolerant method of TLDI is proposed. The proposed method specifies a pair of fault switches through analysis of the output current. In addition, through the single inverter mode operation using the zero-voltage vector, the switch in which open fault has occurred among the fault switch pair is detected and the tolerant control is performed immediately. The effectiveness of proposed method is verified by simulation results.
{"title":"Open-Circuit Fault Diagnosis and Fault-Tolerant Operation of Dual Inverter for Open-End Winding Interior Permanent Magnet Synchronous Motor","authors":"H. Lee, Kyo-Beum Lee","doi":"10.1109/SCEMS56272.2022.9990731","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990731","url":null,"abstract":"This paper proposes the open-circuit fault diagnosis and fault-tolerant method of dual inverter with two isolated DC power sources for driving open-end winding permanent magnet synchronous motor (OEW-IPMSM). Since the multi-level effect of the topology, two-level dual inverter (TLDI) has an advantage in that fault-tolerant control which is not allowable in two-level single inverter. From the structural characteristics of TLDI, when an open fault occurs in single switch, there are switch pairs with the identical tendency of the inverter output current. In this paper, the open-circuit fault diagnosis and fault-tolerant method of TLDI is proposed. The proposed method specifies a pair of fault switches through analysis of the output current. In addition, through the single inverter mode operation using the zero-voltage vector, the switch in which open fault has occurred among the fault switch pair is detected and the tolerant control is performed immediately. The effectiveness of proposed method is verified by simulation results.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114614748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/scems56272.2022.9990745
{"title":"SCEMS 2022 Cover Page","authors":"","doi":"10.1109/scems56272.2022.9990745","DOIUrl":"https://doi.org/10.1109/scems56272.2022.9990745","url":null,"abstract":"","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130869154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990764
Alaa Selim, H. Mo, H. Pota
This article discusses and simulates a demand management algorithm in a building with a battery energy storage system (BESS) and on-grid supply scheduling using deep reinforcement learning algorithms (DRL) and rule-based controllers (Fuzzy logic). BESS is used for supplying the load profile and minimizing the electricity bills of the building. Deferrable loads of the building are controlled to reduce power consumption during peak time. Controllers used in this paper aim to optimize multi-objectives, including the cost of utility bills, state of health of battery systems (SOH), and reliability of the power source. First, this article works with optimizing BESS using the fuzzy logic controller and compares the results with DRL agent outputs. Secondly, commercial loads are modeled based on the deferrability index to be introduced into the optimization problem. Finally, the paper presents a model for controlling the battery and on-grid supply schedule, minimizing the annual electricity bill without draining the battery’s SOH and disturbing the residential comfort of household appliances.
{"title":"Optimal Scheduling of Grid Supply and Batteries Operation in Residential Building: Rules and Learning Approaches","authors":"Alaa Selim, H. Mo, H. Pota","doi":"10.1109/SCEMS56272.2022.9990764","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990764","url":null,"abstract":"This article discusses and simulates a demand management algorithm in a building with a battery energy storage system (BESS) and on-grid supply scheduling using deep reinforcement learning algorithms (DRL) and rule-based controllers (Fuzzy logic). BESS is used for supplying the load profile and minimizing the electricity bills of the building. Deferrable loads of the building are controlled to reduce power consumption during peak time. Controllers used in this paper aim to optimize multi-objectives, including the cost of utility bills, state of health of battery systems (SOH), and reliability of the power source. First, this article works with optimizing BESS using the fuzzy logic controller and compares the results with DRL agent outputs. Secondly, commercial loads are modeled based on the deferrability index to be introduced into the optimization problem. Finally, the paper presents a model for controlling the battery and on-grid supply schedule, minimizing the annual electricity bill without draining the battery’s SOH and disturbing the residential comfort of household appliances.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125308881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990890
Taeyong Yoon, H. Lee, Kyo-Beum Lee
This paper proposes improved direct torque control (DTC) method to drive an open-end winding interior permanent magnet synchronous motor (OEW-IPMSM). DTC provides fast response properties with simple control algorithm. In conventional DTC, torque and stator magnetic linkage flux are controlled by single bandgap that makes authorizing same magnitude of voltage vector. The single bandgap makes the variance of torque or stator magnetic linkage flux to be fixed, difficult to use in a wide range of speeds. In this paper, to drive wide speed regions, multi-level torque bandgap is applied by using dual inverters that has voltage vectors with three different magnitudes. When the variance of the torque is required to follow the reference, proposed method selects the voltage vector that have appropriate magnitude. The validity of the proposed DTC for OEW-IPMSM is verified by the simulation results.
{"title":"Direct Torque Control for Open-End Winding Interior Permanent Magnet Synchronous Motor with multi-level hysteresis bandgap","authors":"Taeyong Yoon, H. Lee, Kyo-Beum Lee","doi":"10.1109/SCEMS56272.2022.9990890","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990890","url":null,"abstract":"This paper proposes improved direct torque control (DTC) method to drive an open-end winding interior permanent magnet synchronous motor (OEW-IPMSM). DTC provides fast response properties with simple control algorithm. In conventional DTC, torque and stator magnetic linkage flux are controlled by single bandgap that makes authorizing same magnitude of voltage vector. The single bandgap makes the variance of torque or stator magnetic linkage flux to be fixed, difficult to use in a wide range of speeds. In this paper, to drive wide speed regions, multi-level torque bandgap is applied by using dual inverters that has voltage vectors with three different magnitudes. When the variance of the torque is required to follow the reference, proposed method selects the voltage vector that have appropriate magnitude. The validity of the proposed DTC for OEW-IPMSM is verified by the simulation results.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"8 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116861808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990867
Seung Ahn Chae, Dae Gyu Lee, Daeyong Um, Gwan Soo Park
In this paper, we have investigated effects of lateral and angular misalignment on the wireless power transfer (WPT) system. The parameters of electric circuit model and the magnetic field distribution was obtained under misalignments. Coupling coefficient, transmission efficiency, current in the coil were analyzed. Also, the magnetic field perpendicular to the receiving coil surface was calculated. The results can show the insight to characterize the type of misalignments and its quantitative evaluation, so the transmission efficiency can be improved, and an overcurrent can be prevented in system by adapting a proper compensation topology.
{"title":"Analysis of Electric Circuit and Magnetic Field Under Lateral and Angular Misalignments in Inductive Wireless Power Transfer","authors":"Seung Ahn Chae, Dae Gyu Lee, Daeyong Um, Gwan Soo Park","doi":"10.1109/SCEMS56272.2022.9990867","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990867","url":null,"abstract":"In this paper, we have investigated effects of lateral and angular misalignment on the wireless power transfer (WPT) system. The parameters of electric circuit model and the magnetic field distribution was obtained under misalignments. Coupling coefficient, transmission efficiency, current in the coil were analyzed. Also, the magnetic field perpendicular to the receiving coil surface was calculated. The results can show the insight to characterize the type of misalignments and its quantitative evaluation, so the transmission efficiency can be improved, and an overcurrent can be prevented in system by adapting a proper compensation topology.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124749708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990667
Salem Nasser Salim Hubais, C. Moorthy, Jamin Santiago, Said Salim Said Masan, Yarab Sharaf Al Din Arfah
The star-delta starter is an inexpensive device to reduce the starting current of a large 3-phase motor and prevent an excessive voltage drop in the power supply. However, the starter is controlled manually or through a wired connection, and its timer for the transition from star to delta connection cannot be set remotely. This paper allows automatic control of the starter and motor; monitoring of line currents, run, stop, and trip status; protection against open connection in any of the three supply lines; and adjustment of the transition time electronically through any mobile phone or computer with a web browser using Internet of Things (IoT) technology.
{"title":"IoT Star-Delta Starter for Remote Control of 3-Phase Motors","authors":"Salem Nasser Salim Hubais, C. Moorthy, Jamin Santiago, Said Salim Said Masan, Yarab Sharaf Al Din Arfah","doi":"10.1109/SCEMS56272.2022.9990667","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990667","url":null,"abstract":"The star-delta starter is an inexpensive device to reduce the starting current of a large 3-phase motor and prevent an excessive voltage drop in the power supply. However, the starter is controlled manually or through a wired connection, and its timer for the transition from star to delta connection cannot be set remotely. This paper allows automatic control of the starter and motor; monitoring of line currents, run, stop, and trip status; protection against open connection in any of the three supply lines; and adjustment of the transition time electronically through any mobile phone or computer with a web browser using Internet of Things (IoT) technology.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123843370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990706
H. Byeon, Woo-Cheol Lee
The LLC resonant converter, one of the DC-DC converters, is used together with the Power Factor Correction (PFC) converter to receive a stable DC input from the commercial power supply. The conventional Boost PFC converter has a simple structure, but due to the semiconductor device used, conduction loss and switching loss occur and low efficiency can be obtained. The bridgeless type of boost PFC converter has a lower number of devices than a general boost PFC converter. Also, high efficiency can be achieved by reducing switching loss by using Critical Conduction Mode (CRM) modes of the PFC. A current sensor is required for CRM operation mode. But this paper applies bridgeless CRM PFC and LLC resonant converters based on digital control without current sensor, and through PSIM simulation and experiment, the above are verified.
{"title":"A Study on the Current Sensorless Bridgeless CRM PFC Converter Based on LLC Resonant Converter","authors":"H. Byeon, Woo-Cheol Lee","doi":"10.1109/SCEMS56272.2022.9990706","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990706","url":null,"abstract":"The LLC resonant converter, one of the DC-DC converters, is used together with the Power Factor Correction (PFC) converter to receive a stable DC input from the commercial power supply. The conventional Boost PFC converter has a simple structure, but due to the semiconductor device used, conduction loss and switching loss occur and low efficiency can be obtained. The bridgeless type of boost PFC converter has a lower number of devices than a general boost PFC converter. Also, high efficiency can be achieved by reducing switching loss by using Critical Conduction Mode (CRM) modes of the PFC. A current sensor is required for CRM operation mode. But this paper applies bridgeless CRM PFC and LLC resonant converters based on digital control without current sensor, and through PSIM simulation and experiment, the above are verified.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116863777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990804
Jongnam Bae, Dong-Hee Lee
This paper presents a novel curved path tracking method for the independent two in-wheel BLDC motor-driven surveillance vehicles. In the autonomous self-driving vehicle type robot, the absolute position and the relative position of the vehicle may be estimated by a GPS (Geometric Positioning System), which is a pre-fixed absolute position, and an installed position sensor. However, GPS cannot be used indoors, and when a location sensor is used, additional costs are incurred and the complexity of system increases. If these sensors are not used, the position of the vehicle depends on the distance traveled by the rotation of the motor. However, the estimated vehicle position based on the integrated motor position is not same as the actual position due to the irregularities of the driving path and the slipping of the wheels. Accordingly, a serious error occurs in the stop position of the vehicle after tracking the curved path in the target position according to the driving path condition. In order to solve this problem, a real-time position error correction method using a direction angle error estimated based on a simple IMU (Inertial Measurement Unit) is introduced. The proposed method calculates the required real-time azimuth of the vehicle on a predetermined driving path. Then, the real-time position error during the driving route can be compensated for as a directional angle error between the required directional angle and the directional angle estimated by the IMU sensor. The performance of the proposed method was verified through experiments.
{"title":"Curve Path Tracking Method of Independent Two In-Wheel Motor Driven Vehicle","authors":"Jongnam Bae, Dong-Hee Lee","doi":"10.1109/SCEMS56272.2022.9990804","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990804","url":null,"abstract":"This paper presents a novel curved path tracking method for the independent two in-wheel BLDC motor-driven surveillance vehicles. In the autonomous self-driving vehicle type robot, the absolute position and the relative position of the vehicle may be estimated by a GPS (Geometric Positioning System), which is a pre-fixed absolute position, and an installed position sensor. However, GPS cannot be used indoors, and when a location sensor is used, additional costs are incurred and the complexity of system increases. If these sensors are not used, the position of the vehicle depends on the distance traveled by the rotation of the motor. However, the estimated vehicle position based on the integrated motor position is not same as the actual position due to the irregularities of the driving path and the slipping of the wheels. Accordingly, a serious error occurs in the stop position of the vehicle after tracking the curved path in the target position according to the driving path condition. In order to solve this problem, a real-time position error correction method using a direction angle error estimated based on a simple IMU (Inertial Measurement Unit) is introduced. The proposed method calculates the required real-time azimuth of the vehicle on a predetermined driving path. Then, the real-time position error during the driving route can be compensated for as a directional angle error between the required directional angle and the directional angle estimated by the IMU sensor. The performance of the proposed method was verified through experiments.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133947697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-24DOI: 10.1109/SCEMS56272.2022.9990874
Sangjae Ok, Dong-Hee Lee
This paper presents a sensorless control method of a high-speed BLDC (Brushless DC) motor for vacuum cleaners using a sliding mode observer. For vacuum cleaners, motor parameters are susceptible to change due to the harsh environment such as high temperature and high speed. Although sliding mode observers (SMOs) are more robust to parameter variation than back-EMF observers, the chattering from the signum function in the SMO decreases the sensorless performance over a wide speed range. Although sigmoid function can reduce the chattering effect, it is still difficult to achieve convergence and chattering cancelation together. In the proposed method, a variable acceleration is introduced for sigmoid function to maintain the convergence and chattering reduction in the full speed range. The optimal acceleration slope of the sigmoid function is applied in the designed SMO according to the estimated speed. The suitability and effectiveness of the sensorless control with SMO to which the proposed variable sigmoid function is applied was verified through experimental results.
{"title":"Sensorless Control of High-Speed BLDC Motor for Vacuum Cleaner Using Sliding Mode Observer","authors":"Sangjae Ok, Dong-Hee Lee","doi":"10.1109/SCEMS56272.2022.9990874","DOIUrl":"https://doi.org/10.1109/SCEMS56272.2022.9990874","url":null,"abstract":"This paper presents a sensorless control method of a high-speed BLDC (Brushless DC) motor for vacuum cleaners using a sliding mode observer. For vacuum cleaners, motor parameters are susceptible to change due to the harsh environment such as high temperature and high speed. Although sliding mode observers (SMOs) are more robust to parameter variation than back-EMF observers, the chattering from the signum function in the SMO decreases the sensorless performance over a wide speed range. Although sigmoid function can reduce the chattering effect, it is still difficult to achieve convergence and chattering cancelation together. In the proposed method, a variable acceleration is introduced for sigmoid function to maintain the convergence and chattering reduction in the full speed range. The optimal acceleration slope of the sigmoid function is applied in the designed SMO according to the estimated speed. The suitability and effectiveness of the sensorless control with SMO to which the proposed variable sigmoid function is applied was verified through experimental results.","PeriodicalId":148762,"journal":{"name":"2022 IEEE 5th Student Conference on Electric Machines and Systems (SCEMS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130365542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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