Bldc Motor Driver Circuit Design

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.

Bldc motor driver circuit design.

A simplified drive circuit is shown in figure 3. Individual drive controls for the high and low drivers permit high drive low drive and floating drive at each motor terminal. What does sensorless bldc drivers do. Figure 2 shows actual size single side pcb design for the bldc motor driver circuit.

Therefore this chapter will focus on the design and implementation of a motor drive as well as its realization of control algorithm. 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. The main design difference between a brushed and brushless motors is the replacement of mechanical commutator with an electric switch circuit. 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.

Figure 3 depicts component layout for the same. The resistive divider may be appropriately dimensioned for enabling an over current protection and control over the connected bldc motor. Construction of 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.