BLDC-原理与驱动

,BLDCMOTOR原理与驱动2007.11.16,一、MOTOR的种类二、BLDCM的构造三、直流变频的种类四、BLDC120度驱动原理五、BLDCM在空调中的应用,CONTENT,CONTENT,CategoryofBLDCMotor,#note1.PMSM:PermanentMagnetSynchronousMotor2.BLDC:BrushlessDC3.BLAC:BrushlessAC4.SRM:SwitchedReluctanceMotor5.SynRm:SynchronousReluctanceMotor,Motor,ACMotor,DCMotor,InductionMotor,SynchronousMotor,UniversalMotor,PMMotor,SinglePhaseThreePhase,PMSM(BLDC,BLAC)SRMSynRm,Rotate,Linear,CategoryofDCMotor,InnerRotorType,OuterRotorType,Rotor,Stator,Magnet,Shaft,Coil,StructureofBLDCMotor1,StructureofBLDCMotor1,StructureofBLDCMotor2,Winding绕制,StructureofBLDCMotor2,StructureofBLDCMotor3,Magnet分布,IPM构造,日立/Sharp,松下/LG/SS,Ferrite(4EA),Ferrite(6EA),Daikin,三洋,Nd(4EA),Nd(8EA),東芝,三菱/松下,Ferrite(4EA),Ferrite(8EA),StructureofBLDCMotor3,直流变频的种类-特点,120度：方波/矩形波/梯形波180度：正弦波/矢量控制,Rectangular(120deg),Sinusoidal(180deg),Currentwaveforms,Low,High(12%),Efficiency,High,Low(23dB(A),Noise,Easytoimplement-BackEMF(openphasevoltages)-Lowresolutionofrotorposition:60deg,Complextoimplement-Estimator(voltagesl转子的长度;r转子的半径;B转子的磁通密度；电机的角速度,关系式：,特征：在任一相的反电势过零点，都有反电势Ea+Eb+Ec=0;在同一通电周期内，每相有两个反电势过零点；位置检出信号对基准位相（线间电压0)为30度领先）；,BEMF的产生及特征,BLDCM驱动原理-BEMF检测,A,B,C,原理：认为每相的R、L和开关管的压降都相同，星行连接点的电压VDC/2,反电势过零点被偏置为VDC/2，相电压与VDC/2比较,回路构成：,BLDCM驱动原理-BEMF检测,MotorSpeedVm(=DCVPWMduty)通过控制PWMDUTY来控制Motor转速.,BLDCM驱动原理-速度控制,BlockDiagramofOutdoorUnitInverterController,INVERTERpart,CONVERTERpart,BLDCM在空调中的应用-BlockDiagram,93%Typical(120度通电方式)(Loss7%),Ex.4KWinputcontrollerloss=4000Wx7%=280W,2%80W,2.5%100W,1.25%50W,1%40W,0.25