Brushless DC motor drive with power factor regulation using Landsman converter

IET Power Electronics, 2016

 ABSTRACT: This study presents a novel configuration of power factor regulation (PFR)-based Landsman converter feeding a brushless DC motor (BLDCM) drive for low-power (400 W) white goods applications. The speed control of the drive is achieved through adjusting the DC bus voltage of voltage source inverter (VSI) feeding to a BLDCM. Moreover, low frequency switching signals are used for electronic commutation of BLDCM, which reduces the switching power losses of six solid-state switches of VSI. This Landsman converter-based front-end power factor corrector operating in discontinuous inductor current mode is used to control DC bus voltage and PFR is achieved inherently. The DC bus voltage of the drive is controlled by using a single DC voltage sensor. For evaluating the performance of proposed drive, a prototype is developed in the laboratory. The performance of the BLDCM is also analysed for its operation at varying AC mains voltage (90–265 V). Experiential results for power quality indices are found within the limits of power quality standard IEC 61000-3-2.



Fig. 1Circuit configurations of a PFR based

Proposed drive scheme of a Landsman converter fed PMBLDCM drive



Fig. 2 Performance of proposed drive at rated torque on motor

a Steady-state performance of the proposed BLDCM drive at rated load on BLDCM with DC-link voltage as 200 V and supply voltage as 220 V

b–d Obtained power quality indices

Fig. 3 Performance of proposed drive at rated load on motor

a Steady-state performance of the proposed BLDCM drive at rated load on BLDCM with DC-link voltage as 60 V and supply voltage as 220 V

b–d Obtained power quality indices

Fig. 4 Performance of PFR-based Landsman converter

a Input and output inductor’s currents and intermediate capacitor’s waveforms

b Current and voltage stress on a PFR switch at rated load on BLDCM at rated condition

Fig. 5 Dynamic performances of the proposed BLDCM drive system during

a Starting at 60 V

b Speed control for variation in DC bus voltage from 100 to 150 V

c Load variation

d Supply voltage change from 260 to 210 V


A PFR-based Landsman converter fed BLDCM drive has been proposed for the use in low power household appliances. Adjustable voltage control of DC bus of VSI has been used to control the speed of BLDCM which eventually has given the freedom to operate the VSI in low frequency switching operation for minimum switching losses. A front-end Landsman converter-based PFR operating in DICM has been applied for double objectives of DC bus voltage control and achieving a UPF at AC supply. Resulted performance for presented drive has been found quite satisfactory for its operation at variation of speed over a wide range. A prototype of Landsman-based BLDCM drive has been implemented with acceptable test results for its operation over complete speed range and its operation over universal AC mains. The stress of the PFR converter switch has been evaluated to conclude its feasibility. The obtained power quality parameters are found within the limit of various international standards like as IEC 61000-3-2.


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