Modulation index effect on inverter based induction motor drive

Abstract

Due to a substantial increase in the use of inverter for numerous electrical appliances starting from domestics to industrial drives, an inverter may be directly connected to the power grid system. The dependency on an inverter has been increased over the years. Hence, the proper and efficient design of the inverter will lead to higher efficiency. One of the major challenges is the generation of suitable gate pulses for power switching devices, which in turn depends on the modulation index. The selection of proper modulation index will help in the production of the rated voltage. If the modulation index is less, the duration of on-time pulses will be less and hence, the device's conduction time is also less, thereby the output voltage of the inverter is reduced. A reduced voltage, when applied to an induction motor will have lower speed and even its performance will be sluggish. The speed of the motor improves when it is operated in a closed-loop for the same modulation index. This research paper tries to bring out the effect of modulation index on speed control of an induction motor based on an inverter for both open as well as closed-loop operation. The simulated results indicate that the modulation index in the vicinity to unity will provide rated voltage for the smooth operation of the motor.

Analisis Pembangkit Pulsa Penyalaan Inverter 3 Fasa Menggunakan Space Vector Pulse Width Modulation (SVPWM)

“…Keunggulan motor ini antara lain memiliki konstruksi sederhana, harga murah, dan mudah didapatkan dipasaran. Namun disisi lain motor ini dalam pengendalian kecepatan putarnya tidak mudah [1], [2]. Ada dua cara pengendalian atau pengasutan motor induksi yaitu pengasutan secara langsung dan tak langsung.…”

Machine learning based multi class fault diagnosis tool for voltage source inverter driven induction motor

“…Figure 1 represents the structure of voltage source inverter driven induction motor. It consists of the three phase AC supply, controlled or uncontrolled rectifier, DC link and an inverter capable of generating variable voltage and variable frequency with PWM pulses.different types of PWM techniques and the modulation index will have impact on inverter line output voltages and stator currents [18], [19]. The three phase supply is connected to a diode bridge rectifier to produce DC voltage at the front end .…”