1 DOI: https://doi.org/10.48001/JoMM.2023.111-5 Copyright (c) 2023 QTanalytics India (Publications) Research Article Volume-1 | Issue-1| Jan-Jun-2023| Effect of Variation in Sampling Time in Speed Regulation of a Synchronous Motor Drive that is Self-Controlled C. O. Azubuike 1* , K. C. Aladum 1 , C. E. Kizito 1 1 Department of Mechanical Engineering, Federal University of Technology, Owerri, Nigeria * Corresponding Author’s Email: azubuikechuik@gmail.com ARTICLE HISTORY: Received: 4 th May, 2023 Revised: 22 nd May, 2023 Accepted: 28 th May, 2023 Published: 5 th Jun, 2023 ABSTRACT: This paper presents an analysis in the variation of sampling time of a synchronous motor drive that is self-controlled. The benefits of the synchronous motors are replacing classical induction and direct current (DC) motor drives. It is anticipated that they may be more significant in the imminent future. Because permanent magnet synchronous motors drives are preferred to perform vital tasks in most applications such as in the automotive industry and aerospace, the system reliability is usually an important consideration. Owing to these reasons, the sampling time of the drives have to be taken into consideration regarding how strong the impact of variation in sampling time can affect the drive performance. The drive is fed with three phase power and is utilized in speed regulation. Proportional integral (PI) regulatory approach is studied and is implemented in a PI-based speed regulatory system is presented. Simulation results of the motor current speed, and torque signals from the synchronous machine dynamics of the field flux are given. It was shown that an increase in sampling time results in the elimination of high frequency signal components. KEYWORDS: Drive Motor Regulation Sampling Speed Synchronous 1. INTRODUCTION Currently, many processes and applications depend on variable speed AC drives centered around the permanent magnet synchronous motors. The benefits of the synchronous motors are replacing classical induction and direct current (DC) motor drives. It is anticipated that they may be more significant in the imminent future. Because permanent magnet synchronous motors drives are preferred to perform vital tasks in most applications such as in the automotive industry and aerospace, the system reliability is usually an important consideration. Owing to these reasons, the sampling time of the drives have to be taken into consideration regarding how strong the impact of variation in sampling time can affect the drive performance (Ukoima, 2019). Magnetically salient rotor synchronous motors like the permanent-magnet assisted synchronous reluctance motors, interior permanent-magnet synchronous motors and the synchronous reluctance motors are frequently used for industrial applications, electric cars and heavy-duty working machines. It was noted that in such scenarios, the highest operating frequencies and highest speeds have extremely high values (e.g., 10 000 r/min equivalent to the frequency of 1000 Hz for a machine that is ten-pole). Because of losses, there is a limitation in the converter rate of switching the motor. As a result, the proportion between the maximum fundamental frequency and that of the frequency of switching may be very low. This in turn affects the sampling rate. Normally it is either equivalent to the switching rate or twice the rate of switching. In synchronous motor drives, a current regulator is usually aimed in the continuous time domain. It is then digitalized for implementation in the digital domain. Although this is a well-known method used in many applications, the JOURNAL OF Mechatronics and Machines Double Blind Peer Reviewed Journal DOI: https://doi.org/10.48001/JoMM