POWER FACTOR CORRECTION IN PERMANENT MAGNET BRUSHLESS DC MOTOR DRIVE USING SINGLE-PHASE CUK CONVERTER

Permanent magnet brushless DC motor (PMBLDCM) drives are being employed in many variable speed applications due to their high efficiency, silent operation, compact size, high reliability, ease of control, and low maintenance requirements. These drives have power quality problems and poor power factor at input AC mains as they are mostly fed through diode bridge rectifier based voltage source inverters. To overcome such problems a single-phase single-switch power factor correction AC-DC converter topology based on a Cuk converter is proposed to feed voltage source inverters based PMBLDCM. It focuses on the analysis, design and performance evaluation of the proposed PFC converter topology for a 1.5 kW, 1500 rpm, 400 V PMBLDCM drive used for an air-conditioning system. The proposed PFC converter topology is modelled and its performance is simulated in Matlab-Simulink environment and results show an improved power quality and good power factor in wide speed range of the drive

A Fuzzy Logic Control Strategy for Buck PFC Converter Based 4- Switch VSI Fed BLDC Motor Drive

In this paper, a new Buck PFC dc–dc converter topology along with fuzzy logic control for a permanent magnet (PM) brushless dc motor (PMBLDCM) has been proposed. The proposed buck-PFC converter topology is on single stage power factor correction converter. A concept of dc link voltage control which is proportional to speed of the PMBLDCM is used in this paper. The stator currents of the PMBLDCM during step change in the reference speed are controlled within the specified limits by an addition of a rate limiter in the reference dc link voltage. The effectives of the proposed control strategy of PMBLDCM drive is validated through simulation results

Review on power quality solution technology

This paper presents a comprehensive study of various possible solutions for power quality improvement in common applications and supply system. This includes improved power quality converters (IPQC), multi-pulse converters, active compensation, passive compensation and their hybrid configurations. Various configurations and topologies of custom power devices such as DSTATCOM (Distribution Static Compensator), DVR (Dynamic Voltage Restorer) and UPQC (Unified Power Quality Compensator) are also described in detail. Main applications of these devices are for reactive power compensation, harmonic elimination, voltage sag/swell mitigation, voltage regulation, load balancing, neutral current reduction etc. Many such cases of power quality problems have been taken up and suitable solutions have been identified for those cases. As an example, a model of DSTATCOM is developed and its performance is presented for a distribution system feeding nonlinear loads

ANALYSIS OF VARIABLE SPEED PFC CHOPPER FED BLDC MOTOR DRIVE

ABSTRACT This paper provides the detailed analysis of the DC-DC chopper fed Brushless DC motor drive used for lowpower applications. The various methods used to improve the power quality at the ac mains with lesser number of components are discussed. The most effective method of power quality improvement is also simulated using MATLAB Simulink. Improved method of speed control by controlling the dc link voltage of Voltage Source Inverter is also discussed with reduced switching losses. The continuous and discontinuous modes of operation of the converters are also discussed based on the improvement in power quality. The performance of the most effective solution is simulated in MATLAB Simulink environment and the obtained results are presented

A voltage-controlled PFC Cuk converter-based PMBLDCM drive for air-conditioners

This paper deals with a Cuk dc-dc converter as a single-stage power-factor-correction converter for a permanent-magnet (PM) brushless dc motor (PMBLDCM) fed through a diode bridge rectifier from a single-phase ac mains. A three-phase voltage-source inverter is used as an electronic commutator to operate the PMBLDCM driving an air-conditioner compressor. The speed of the compressor is controlled to achieve optimum air-conditioning using a concept of the voltage control at dc link proportional to the desired speed of the PMBLDCM. The stator currents of the PMBLDCM during step change in the reference speed are controlled within the specified limits by an addition of a rate limiter in the reference dc link voltage. The proposed PMBLDCM drive (PMBLDCMD) is designed and modeled, and its performance is evaluated in Matlab-Simulink environment. Simulated results are presented to demonstrate an improved power quality at ac mains of the PMBLDCMD system in a wide range of speed and input ac voltage. Test results of a developed controller are also presented to validate the design and model of the drive

A voltage controlled PFC Cuk converter based PMBLDCM drive for air-conditioners

This paper deals with a Cuk DC-DC converter as a single-stage power factor correction (PFC) converter for a permanent magnet brushless DC motor (PMBLDCM) fed through a diode bridge rectifier (DBR) from a single-phase AC mains. A three-phase voltage source inverter is used as an electronic commutator to operate the PMBLDCM driving an air conditioner compressor. The speed of the compressor is controlled to achieve optimum air-conditioning using a concept of the voltage control at DC link proportional to the desired speed of the PMBLDCM. The stator currents of the PMBLDCM during step change in the reference speed are controlled within the specified limits by an addition of a rate limiter in the reference DC link voltage. The proposed PMBLDCM drive with the voltage control is designed, modeled and its performance is evaluated in Matlab-Simulink environment. The obtained results are presented to demonstrate an improved power quality (PQ) at AC mains of the PMBLDCM drive system in wide range of the speed and the input AC voltage

Medição indireta de torque e velocidade angular de motor de corrente contínua sem escovas

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2016.Em algumas aplicações de motores, como compressores herméticos de refrigeração, torque e velocidade angular são grandezas que podem oscilar significativamente durante uma revolução do eixo. A determinação dessas variações é de grande importância para assegurar eficiência ao motor e, no caso dos compressores, garantir conforto acústico ao usuário final. Quando o motor é interior a um invólucro selado, a determinação dessas grandezas por meio de instrumentação convencional é inviável e a obtenção delas a partir de variáveis externas se torna uma opção atraente. Resultados disponíveis na literatura indicam que é possível determinar o torque e a velocidade angular indiretamente em diferentes tipos de motores associados a compressores herméticos, entre eles os motores de corrente contínua sem escovas, que são alimentados por conversores eletrônicos. Neste trabalho, apresentase proposta de solução para determinação de torque e velocidade angular do motor de corrente contínua sem escovas a partir dos valores de tensão e correntes obtidas junto a tais conversores. Na proposta, baseada na modelagem matemática do motor de corrente contínua sem escovas, a tensão induzida é variável subjacente à estimação das grandezas de interesse, fazendo-se necessário obtê-la para qualquer posição angular do rotor. A avaliação dos valores estimados por meio da solução proposta demanda o desenvolvimento de uma bancada com características peculiares. Tal bancada deve possibilitar, de forma inédita, gerar e medir oscilações de torque com frequência igual à frequência rotacional, bem como medir a velocidade angular e tensão induzida do motor de corrente contínua sem escovas. A avaliação da solução proposta é feita pela comparação dos valores estimados com valores de referência obtidos em medição direta das variáveis nessa bancada. Tais testes mostraram a viabilidade da solução para todas as variáveis estimadas, com curvas de tendência de tensão induzida e velocidade angular que se assemelham às de referência.Abstract : In some electrical motors applications such as hermetic refrigeration compressors, torque and angular rate are quantities that can fluctuate significantly during an axis revolution. The determination of these variations is of great importance to ensure efficiency to the motor and, in the case of compressors, to guarantee acoustic comfort to the end user. When the motor is inside a sealed enclosure, the determination of these quantities by means of conventional instrumentation is impracticable and obtaining them from external variables becomes an attractive option. Results available in the literature indicate that it is possible to determine the torque and angular rate indirectly in different types of motors associated with hermetic compressors, among them the brushless DC motors, which are fed by electronic converters. In this work, we propose a solution for determination of torque and angular rate of the BLDC from the voltage and current values obtained with such converters. In the proposal, based on the mathematical modeling of the BLDC, the back electromotive force is variable underlying the estimation of the quantities of interest, making necessary to obtain it for any angular position of the rotor. The evaluation of the estimated values through the proposed solution demands the development of a bench with peculiar characteristics. Such a bench should enable, in a novel way, to generate and measure torque oscillations with frequency equal to the rotational frequency, as well as to measure the angular rate and induced voltage of the BLDC. The evaluation of the proposed solution is made by comparing the estimated values with reference values obtained in direct measurement of the variables in this bench. These tests showed the viability of the solution for all the estimated variables, with curves of back electromotive force and angular rate that resemble those of the reference