https://jurnaleeccis.ub.ac.id/ p-ISSN : 1978-3345, e-ISSN(Online): 2460-8122 Jurnal EECCIS Vol. 14, No. 2, Agustus 2020 pp 63-67 Manuscript submitted on June 2020, accepted and published on August 2020 Induction Motor Harmonics Voltage Waveform Analysis based on Machine Construction Akhlaqul Karomah 1 , Wiyono 2 , Hari Soekotjo 3 1,2,3 Electrical Engineering Department, Brawijaya University, Malang, Indonesia Email: [email protected], [email protected], [email protected]Abstract— This paper discussed about harmonic analysis in an induction motor. Harmonics on induction motor appear due to the machine construction specially to its slots. The analysis of those harmonic will be one of the problems in the machine observation and design. In this paper a simulated computation of the flux magnet and emf induction voltage containing harmonic is proposed and discussed. FEMM simulation software is used and the result is compared to the mathematical analysis. The result shows that the emf induction harmonics wave derived from mathematic modelling and FEMM conform each other. Each of proposed methods can be used in the machine design or the evaluation analysis. Index Terms—harmonic, induction motor I. INTRODUCTION Harmonics on electrical motor can cause several conditions to induction motor. In an induction motor, harmonics reduce motor’s efficiency because copper and iron in stator and rotor become hard to magnetize. High eddy current and hysteresis losses appear due to harmonics.[1] The high current density from eddy current generated by the high frequency harmonics leakage fields of the rotor air gap. It creates high secondary winding losses and significant heating. Heat can cause the decrease of insulation on winding therefore lifetime of motor become shorten. [2] Harmonics with high dV/dt affect partial discharge in winding and fasten the degradation of winding insulation. Harmonics are caused by stator and rotor design with its slots. The slot design of rotor and stator create different harmonics wave. Harmonics due to construction of rotor slot from the electric machinary is called “slot harmonics” [3] Non uniformity of the airgap caused by stator and rotor slotting, winding concentration, rotor eccentricity and saturation are the main sources of harmonic fields in she airgap of induction machines. [3] The problem of this research is the difficulty of knowing the slot harmonics. In order to find the slot harmonics equation, the formula is derived from several basic magnetic flux density and the slot characteristics. After finding the slot harmonics equation, the wave result from FEMM simulation from the same induction motor are compared. Estimation in harmonic electromagnetic fields in induction motors is considered important due to the design trends of smaller size, higher output and the spread of inverter drives in recent years [4]. II. METHOD A. Basic Parameters Induction motor construction design is made by defining the basic parameter as follow: TABLE I BASIC PARAMETERS No Parameters Value 1 N (total winding) 160 2 L (motor’s length) 0,4 m 3 f (linier frequency) 50Hz 4 ω (angular velocity) 3000 rot/s 5 Number of poles 3 6 Rotor current (max) 10 7 Stator Slot Opening 0,1 m 8 Rotor Slot Opening 0,095m 9 Stator inner radius 0,16 m 10 Rotor outer radius 0,165 m 11 Machine length 0,4 m 12 Stator slot number 18 13 Rotor slot number 14 14 μ 0 (air permeability) 1 15 θ (rotating angle) 0 – 360 16 k (orde) 1 - 180 B. Induction Motor Construction Design with FEMM Induction motor is designed by making FEMM software version 4.2 made by David Meeker. Parameters from sub chapter 2.1 are used to design the motor construction with the design result can be seen here in picture 2.1: Fig.1. Machine Construction Design with FEMM Then, make the design analysis Fig. 1 by doing Mesh analysis on FEMM with the result can be seen in Fig. 2.
5
Embed
Induction Motor Harmonics Voltage Waveform Analysis based ...
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
https://jurnaleeccis.ub.ac.id/
p-ISSN : 1978-3345, e-ISSN(Online): 2460-8122
Jurnal EECCIS Vol. 14, No. 2, Agustus 2020
pp 63-67
Manuscript submitted on June 2020, accepted and published on August 2020
Induction Motor Harmonics Voltage Waveform
Analysis based on Machine Construction Akhlaqul Karomah1, Wiyono2, Hari Soekotjo3
1,2,3 Electrical Engineering Department, Brawijaya University, Malang, Indonesia