ILS - DC 12V-36V 500W High Power Brushless Motor Controller Driver Board Assembled No Hall

hi guys this is the sensorless type of BLDC motor speed controller now guys you can see that the packing is good let's open it up the three blue wires that you see are for connecting the PCB to the BLDC motor terminals the red and black wires are for connecting the circuit board to the batteries you can see guys that the circuit board is really compact and behind the PCBs is the switching transistors or MOSFETs which ever have been used they have been covered with blue tape so that in case if we connect heat sinks we do not short-circuit them now this is the direction changers switch for clockwise or anti-clockwise and this is for controlling the speed of the BLDC motors and this is the pen that will be connected to the PCB let's strip off the wires now these sensorless types of BLDC motor controllers require back EMF from the motor to determine the location of the magnetic poles north