OutRunner motors provide more torque, making them also the ideal choice for electric propulsion and drone applications. OutRunner motors are particularly useful for electric bicycle applications because the motor’s outer shell directly drives the bicycle wheel, eliminating the need for a clutch mechanism. In the OutRunner, the motor itself rotates around the axis with the coil, which remains stationary. That is, in the Inrunner (most DC motors are designed according to this principle), the axis inside the motor rotates, and the shell remains stationary. In Inrunner motors, the rotor magnets are inside the stator with windings, while in OutRunner motors, the magnets are outside and rotate around a stationary stator with windings. There are Inrunner and Outrunner BLDC motors. There are different types of BLDC motors – let’s look at the main ones. The speed at which the motor rotates depends on how quickly power is applied to the motor coil, and the direction of rotation depends on the order in which the phases that are alternately energized are swapped. The ESC controller then energizes the other two wires (phases), and this process of changing the wires that are energized continues continuously, causing the motor to rotate. During this process, the coil inside the motor is energized, causing the magnets to align with the energized coil. At any one time, only two phases are energized, i.e., the electric current enters the motor through one phase and leaves it through the other. The ESC (Electronic Speed Controller) is used to convert the DC voltage into a pulses sequence and distribute them over the three leads. Unlike other DC motors, BLDC motors are connected with three wires coming out of them, with each wire forming its own phase, which means you get a three-phase motor.Īlthough BLDC motors are DC motors, they are controlled by a pulse sequence. 9 Useful Video: How to Run Brushless Motor Using Arduino How Brushless (BLDC) Motors WorkīLDC motors are now often used in ceiling fans and electric moving vehicles because of their smooth rotation.
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