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This paper examines the influence of the motor pole pair number on the audible noise of electric motors for inverter operation. The number of pole pairs affects different parameters related to electromagnetic noise generation: the mode shape of the related force waves, the motor eigenfrequencies, the speed range where flux weakening is activated, as well as the frequencies of the radial force waves...
Voltage source inverters (VSIs) supply nonsinusoidal voltages to induction motor drives, leading to line current distortion and torque pulsation. Conventional space vector pulsewidth modulation (PWM) techniques are widely used in VSIs on the account of good waveform quality and high dc bus utilization. In a conventional space vector PWM technique, the switching sequence begins with one zero state...
The electromagnetic forces due to the interaction of harmonic rotor and stator fields of various origins such as slotting, saturation, eccentricity and harmonics of the supply voltage due to inverter operation in induction machines are introduced. A modal analysis has to be done to judge, if these forces excite vibrations of the stator, which leads to noise emission of the motor. The modal analysis...
An improvement over a recently published control strategy is presented. The goal consists in reducing the acoustic noise caused by a PWM-Controlled Induction Machine Drives. It is a technique that uses a sinusoidal modulator wave (with harmonics injection) and a modulated frequency triangular carrier signal, and after comparing them, the modulated wave is obtained. The technique generates an efficient...
In this work we present the study and identification of the frequencies of the signals implied in a sine PWM control based on DSP of electrical machines, especially in a three-phase motor of induction. We will also try this identification will be used as a basic for a later analysis of the influences they will originate in the acoustic noise level emitted by the machine.
This paper presents a new modulation strategy control used to reduce the acoustic noise radiated by PWM-controlled induction machine drives and compares the measurements (and results) between a classical SPWM (sinusoidal pulse width modulation) and the new strategy HIPWM-FMTC (harmonics injections PWM and frequency-modulated triangular carrier) with a 1 KW induction machine with no load.
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