Research On Improving The Efficiency Of Brushless Motor Drivers

The advent of brushless DC motors overcomes many of the problems of brushed DC motors,such as noise,sparks,radio interference and short life caused by mechanical brushes and commutators.In the case of a brushless DC motor,simply speaking,it is a DC motor that replaces the mechanical commutation of a brushed DC motor with electronic commutation.In this way,the brushless DC motor not only has the advantages of the brushed DC motor,but also has some advantages of the AC motor,such as simple structure and high reliability.Therefore,brushless DC motors have been extended to many industries and fields.The loss of the motor body and the loss of the driver have always been the two main parts of the power loss of the brushless motor.In this design,the main problem is that the inverter circuit in the driver has a large loss,and a new topology of the inverter circuit is proposed.The new inverter circuit changes the connection mode of the switching tube in the traditional three-phase full-bridge inverter circuit,that is,the connection mode of the upper and lower bridge arms is changed from series connection to reverse parallel,and the number of switching tubes when conducting is The original two are reduced to one.Therefore,it can be used to reduce the power loss of the three-phase brushless DC motor(BLDCM)in the driver,thereby improving the operating efficiency of the entire motor system.The main contents of this paper are:The two topologies widely used in the inverter’s inverter circuit are briefly introduced,and the characteristics of the two topologies are summarized,and the reasons for the power loss in the inverter circuit are analyzed.In this paper,based on the analysis and modeling of the motor principle and the analysis of the operating principle of the widely used three-phase full-bridge inverter circuit,a new type of inverter circuit topology is proposed.The steady-state operation and commutation of the inverter circuit were analyzed in detail.In order to ensure the feasibility of the new inverter circuit,we used MATLAB/simlink to control the simulation and PSpice in ORcad to simulate the efficiency of the new driver.The phase voltage,phase current and speed of the motor were obtained by MATLAB/simlink.The graph,which can initially prove that the new inverter circuit can achieve the control of the motor,and the PSpice simulation can give an overall improvement in efficiency.Finally,through the construction of physics experiments,the completion of the relevant procedures and the collection and analysis of relevant data through the upper computer LABVIEW,finally through the debugging to obtain the actual relevant data,and shows that the efficiency of the driver is improved at the optimal time,the design is realized.Claim.