Abstract motor does not need brush and commutator thereby

Abstract This paper explains with a BLDC motordrive for low power application which uses a CUK converter with fuzzy logiccontroller. A filter circuit is used to reduce the dc ripples. A usage of the threelevel NPC inverter is to produce the nearly sine wave and reduce the totalharmonic distortion.

The operations of CUK converters are continuous and discontinuousconduction mode and operated under four different conditions and the bestsuited mode is selected for operation. Using MATLAB/SIMULINK the proposedsystem is simulated in environment and the performance is obtained.Keywords: PFC Cuk Converter , NPCInverter, Fuzzy Logic Controller, BLDC motor, Total Hormonics Distraction (THD).

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                                                                                                                                                                   I.           INTRODUCTION        The Low and medium power applicationsprefer Brushless dc (BLDC) motors due to its high efficiency, high flux density,less maintenance required, and other advantages. This motor does not need brushand commutator thereby wear and tear problems are very less. Besides, thismotor is described as electronically commutated type which is based on HallEffect sensor instead of mechanical commutation. In Industries, enhanced powerquality is mandatory as per the International standards which need low totalharmonic distortion and high power factor.Hence, 1? power factor correction (PFC) converters are used to attain aunity Power factor at main AC supply voltage. Due to the single-stagerequirement these converters are having enlarged attention for dc-link voltagecontrol with unity Power factor at ac mains.

Compare to multistage converter itused very less component count and therefore it offer reduced losses.Conventional methods of power factor correction converter-fed BLDC motor driveto utilize the  approach of constantdc-link voltage of the VSI and controlling to the speed by to controlling theduty ratio of high frequency pulse width modulation (PWM) signals 1-3. To considerthe losses of VSI in such type of configuration since switching losses dependon the square of switching frequencies 4.They have some disadvantages likeusage of a complex control because it requires the large amount of sensors and highend digital signal processor (DSP) for attaining a DTC operation with PFC at acmains. For low cost application this scheme is not suitable. In this work to proposedan active power factor correction scheme which is used in  a PWM switching of VSI and hence has highswitching losses.

This paper to propose a cascaded buck–boost converter-fedBLDC motor drive, which utilizes two switches for power factor correctionoperation 5-8. Due to double switch its offers high switching losses in thefront-end converter and reduces the overall system  efficiency of proposed a single-ended primaryinductance converter (SEPIC) as a front-end converter for PFC with a DC-link voltagecontrol approach, but it has high switching losses because to utilizes the PWMswitching of VSI. Bridgeless configurations of PFC buck–boost, CUK, SEPIC, andZeta converters have been proposed in respectively 9-10.