6 research outputs found
Simulation of three-phase induction motor drives using indirect field oriented control in PSIM environment
No full textSpeed Performance Improvement Of Three-Phase Induction Motor Drives Using Adaptive Sliding Mode Controller
No full textThe induction motor is widely used in industrial applications. The most type of induction motor used in the industrial applications is three-phase squirrel cage AC induction motor. Several industrial applications use the induction motor because of its ruggedness, reliability and relatively low cost. However, more complexity control scheme is required for the induction motor because it is highly non-linear in a dynamic structure. In addition, the rotor currents and flux-linkage of induction motor also cannot be directly measured. The modified classical sliding mode control (SMC) algorithm is developed based on the conventional robust controller with the adaption of switching gain and discontinuous sigmoid functions to eliminate the undesirable chattering phenomenon. The main focus of this research is to design a sliding mode control strategy that provides speed performance improvement of delay time (td), rise time (tr), peak time (tp), maximum % overshoot (Mp), settling time (ts) and steady-state error (ess) for the three-phase induction motor drives. More specifically, research objectives are to design a sliding mode controller by using an adaptive control strategy and compare with conventional SMC and PI speed controller. Then, the developed speed controller is implemented in an experimental rig based on indirect field-oriented control (IFOC) by using the digital signal processor (DSP) to achieve high performance control characteristics in controlling torque and rotor flux effectively. The PI or PID controllers are tuned to improve speed control issues of AC induction motor due to load variations and changes in parameters. However, the conventional strategy of the PI controller is realized cannot achieve better performance when the input of load variations are applied. Specifically, the algorithm to overcome these issues is proposed by using an ASMC and the speed control performances are tested in simulation by using PSIM software. Practically, the experimental works on hardware rigs are based on high voltage digital motor control (HVDMC) with power factor correction (PFC) from Texas Instruments (TI) that attached with the floating-point of TMS320F28335 DSP to analyze and validate the performance of an ASMC control algorithm. Moreover, the features of an ASMC are compared with conventional SMC and PI controller to improve the performance of an ASMC control algorithm. As a result, highperformance control of AC induction motor is achieved for different speed commands and loaded conditions as compared to conventional controllers. Technically, simulated results at 1400rpm with no-load conditions of maximum % overshoot (ASMC, Mp=14.4%), (SMC, Mp=24.42%), (PI, Mp=30.41%) and steady-state error (ASMC, ess=1.76rpm), (SMC, ess=6.02rpm), (SMC, ess=2.23rpm) are clearly summarized the ASMC is more superior performances compared with differences speed controllers of SMC and PI respectively. Supremely, experimental results for the ASMC at 1400rpm with no-load conditions of maximum % overshoot (Mp=0.28%) and steady-state error (ess=3.21rpm) are achieved comprehensive performances. Apart from this, the benefit of this research work is importantly desired for the non-linear of the AC motor to achieved dynamic performances such as fast response and also practically used at variable speed conditions
Comparison Performances of Indirect Field Oriented Control for Three-Phase Induction Motor Drives
No full textThis paper presents the comparative performances of Indirect Field Oriented Control (IFOC) for the three-phase induction motor. Recently, the interest of widely used the induction motor at industries because of reliability, ruggedness and almost free in maintenance. Thus, the IFOC scheme is employed to control the speed of induction motor. Therefore, P and PI controllers based on IFOC approach are analyzed at differences speed commands with no load condition. On the other hand, the PI controller is tuned based on Ziegler-Nichols method by using PSIM software which is user-friendly for simulations, design and analysis of motor drive, control loop and the power converter in power electronics studies. Subsequently, the simulated of P controller results are compared with the simulated of PI controller results at difference speed commands with no load condition. Finally, the simulated results of speed controllers are compared with the experimental results in order to explore the performances of speed responses by using IFOC scheme for three-phase induction motor drives
Comparison Performance Of Indirect Field Oriented Control For Three-Phase Induction Motor Drive
No full textThis paper presents the comparative performances of Indirect Field Oriented Control (IFOC) for the three-phase induction motor. Recently, the interest of widely used the induction motor at industries because of reliability, ruggedness and almost free in maintenance. Thus, the IFOC scheme is employed to control the speed of induction motor. Therefore, P and PI controllers based on IFOC approach are analyzed at differences speed commands with no load condition. On the other hand, the PI controller is tuned based on Ziegler-Nichols method by using PSIM software which is user-friendly for simulations, design and analysis of motor drive, control loop and the power converter in power electronics studies. Subsequently, the simulated of P controller results are compared with the simulated of PI controller results at difference speed commands with no load condition. Finally, the simulated results of speed controllers are compared with the experimental results in order to explore the performances of speed responses by using IFOC scheme for three-phase induction motor drives
Office of the Future: A Study on Office Reduction and Perceived Employee Productivity of Global Pharmaceutical companies in the Netherlands
No full textRestrictions from the covid pandemic are lifted. However, the office remains changed, the hybrid way of working seems to stick. Employees want flexibility and choose when to work from home and when they work in the office. The norm of a hybrid work week is working three days in the office and two days from home. Resulting in office space that is not used as much as before the pandemic. Therefore organizations are looking into reducing their office space (Syme, P., 2023). When considering the reduction of office space, it is also important to consider an organization’s employees. In this research, the focus lies on the impact space reduction might have on the perceived productivity of the employees. The focus on productivity is due to the impact productivity has on the performance of an organization (Aziri, 2011). If office space is reduced and the office therefore has a higher occupancy level, what does this do to the employee productivity? According to research done by Center for People and Buildings (2023), a higher occupancy level in the working environment results in employees being less satisfied with the availability of workplaces. With a higher occupancy, employees are forced to have video meetings in the open workspace, while other employees/colleagues are doing concentration work in the same space at the same time (Center for People and Buildings, 2023). Looking at these uncertainties, the main research question therefore is: ‘How can global pharmaceutical companies reduce their office space in the Netherlands while still maintaining perceived employee productivity?’. The research focuses on global pharmaceutical companies that are reducing their office space. The focus lies on these companies, in order to define the research on a specific branch and due to the timeframe. In order to answer the research question, the research starts with a literature study. After the literature study, a series of case studies including interviews are done on global pharmaceutical companies. These companies have already experienced an office reduction and are planning on implementing a second reduction within the same project or with another project. The case studies provide insight into potential challenges concerning office reduction and maintaining employee productivity. After analyzing the case studies a cross case study analysis has been done. With the insights from the cross case analysis solutions have been found on how global pharmaceutical companies have tried to successfully reduce office space while keeping employee productivity. The research can help organizations with the decision-making on their office use.Architecture, Urbanism and Building Sciences | Management in the Built Environmen
