One precaution that must be taken with this type of driver circuit is that both high side and low side drivers must never be activated at the same time.
Bldc motor driver circuit design.
Figure 2 shows actual size single side pcb design for the bldc motor driver circuit.
Brushless dc motor bldc and permanent magnet ac synchronous motors drives have many advantages such as high efficiency small size less rotor losses and fast torque response over the induction motor drives.
A brushless dc electric motor bldc motor or bl motor also known as electronically commutated motor ecm or ec motor and synchronous dc motors are synchronous motors powered by direct current dc electricity via an inverter or switching power supply which produces electricity in the form of alternating current ac to drive each phase of the motor via a closed loop controller.
Keeping that in mind a bldc motor is a type of synchronous motor in the sense that the magnetic field generated by the stator and the rotor revolve at the same frequency.
What does sensorless bldc drivers do.
Therefore this chapter will focus on the design and implementation of a motor drive as well as its realization of control algorithm.
Figure 3 depicts component layout for the same.
A simplified drive circuit is shown in figure 3.
The second circuit which forms the main driver configuration for the proposed 3 phase brushless bldc motor driver circuit could be also seen having a current sensing stage across its lower left section.
The sensor less bldc driver circuit simply electrifies the 3 sets of winding in a sequential manner such that the magnetic rotor is able to go through a consistent opposing force enabling the motor to accomplish a sustained torque and rotational force.
Construction of bldc motor driver circuit.
The resistive divider may be appropriately dimensioned for enabling an over current protection and control over the connected bldc motor.