How to Select Your Brushless DC Flat Motor

Selection Criteria

Motor type

For Brushless DC Flat motors, Portescap identifies these with either a BF, or ECF designation. BF motors are our Brushless DC Flat Slotless motors, and ECF are our Brushless DC Flat Slotted motors.

Motor size

Typically the best place to start when sizing a brushless DC motor is matching motor size (diameter). Diameter ranges from 20mm and up.

Winding

Various winding options are proposed to best match with the application requirements – voltage, resistance and torque constant are the basic parameters for selection.

Electronics

Generally with three winding phases, brushless DC motors are electronically commutated. A simple way to drive these motors is to power two phases at a time, using hall sensors to know the rotor position, with a simple logic to allow optimal energizing of the phases as a function of rotor position. Another way is to use sensorless electronics, working with the zero-crossing criteria to determine rotor position and commutation cycle. This electronics format is well suited for constant speed applications as they are highly insensitive to hostile environments.