Open Loop

When using open loop, the motor is excited through direct voltage application, without taking into account sensor feedback.

When using brushless motors, this mode uses commutation sensors to determine the position of the rotor, therefore achieving maximum electric-energy-to-torque ratio. Nevertheless, notice that this does not mean that any control loop is closed: the commutation sensors are used exclusively to switch between the phases being injected current and the phases that drag the return current.