If your application requires accurate speed control and your motor does not have Hall-effect sensors (many BLDC motors do), then this simplified circuit is not suitable for your application. However, this circuit was designed for a rather simple application where speed feedback is not required – the load is so light that the motor is guaranteed to complete the steps given to it and the rate that the controller sets up. Using three different levels – LOW, HIGH and OPEN could have enabled us to disable one of the windings on each of the steps, which results in more torque and also enables rotational speed feedback via measuring voltage induced on the disabled winding by the permanent magnet of the rotor. With three driver inputs it is possible to create only two levels at the ends of the windings: LOW and HIGH. Please note that this is a simplified circuit that only makes use of three MCU outputs. The circuit diagram below is a concept that should work with any microprocessor (or a specialized driver IC) that is able to produce the correct commutation sequence: It is not much different from a bipolar stepper driver in that we need the be able to both source and sink current at all ends of the windings, except of course in this case there are only three ends whereas the bipolar stepper has four. Once you understand the commutation sequence for the particular design of the BLDC motor, the circuit design for the BLDC driver becomes pretty clear. Please see the first part for a bit of info on the theory behind the commutation sequence. This is a second installment in the series of posts related to Arduino and brushless DC motors. In this post I will describe the hardware and the software part of a project involving the use of BLDC (Brushless DC) motor salvaged from a broken XBox 360. Arduino Tutorial Online Courses Video Training.Arduino Nano Projects List in PDF offline downloadable.Android based arduino Projects List Download PDF.

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Add part to fritzing library dfmotor