Abstract motor does not need brush and commutator thereby


This paper explains with a BLDC motor
drive for low power application which uses a CUK converter with fuzzy logic
controller. A filter circuit is used to reduce the dc ripples. A usage of the three
level NPC inverter is to produce the nearly sine wave and reduce the total
harmonic distortion. The operations of CUK converters are continuous and discontinuous
conduction mode and operated under four different conditions and the best
suited mode is selected for operation. Using MATLAB/SIMULINK the proposed
system is simulated in environment and the performance is obtained.

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Keywords: PFC Cuk Converter , NPC
Inverter, Fuzzy Logic Controller, BLDC motor, Total Hormonics Distraction (THD).



        The Low and medium power applications
prefer Brushless dc (BLDC) motors due to its high efficiency, high flux density,
less maintenance required, and other advantages. This motor does not need brush
and commutator thereby wear and tear problems are very less. Besides, this
motor is described as electronically commutated type which is based on Hall
Effect sensor instead of mechanical commutation. In Industries, enhanced power
quality is mandatory as per the International standards which need low total
harmonic distortion and high power factor.
Hence, 1? power factor correction (PFC) converters are used to attain a
unity Power factor at main AC supply voltage. Due to the single-stage
requirement these converters are having enlarged attention for dc-link voltage
control with unity Power factor at ac mains. Compare to multistage converter it
used very less component count and therefore it offer reduced losses.
Conventional methods of power factor correction converter-fed BLDC motor drive
to utilize the  approach of constant
dc-link voltage of the VSI and controlling to the speed by to controlling the
duty ratio of high frequency pulse width modulation (PWM) signals 1-3. To consider
the losses of VSI in such type of configuration since switching losses depend
on the square of switching frequencies 4.

They have some disadvantages like
usage of a complex control because it requires the large amount of sensors and high
end digital signal processor (DSP) for attaining a DTC operation with PFC at ac
mains. For low cost application this scheme is not suitable. In this work to proposed
an active power factor correction scheme which is used in  a PWM switching of VSI and hence has high
switching losses. This paper to propose a cascaded buck–boost converter-fed
BLDC motor drive, which utilizes two switches for power factor correction
operation 5-8. Due to double switch its offers high switching losses in the
front-end converter and reduces the overall system  efficiency of proposed a single-ended primary
inductance converter (SEPIC) as a front-end converter for PFC with a DC-link voltage
control approach, but it has high switching losses because to utilizes the PWM
switching of VSI. Bridgeless configurations of PFC buck–boost, CUK, SEPIC, and
Zeta converters have been proposed in respectively 9-10.



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