From M.S. Kennedy Corp.
When making a DC brushless motor controller choice, there are several issues that have to be addressed so that the proper device is selected for a system. If the application is a simple fan or blower, a rather simple speed controller with just an over-current limit is all that may be necessary. If the direction of the motor needs to be changed, this has to be taken into account in the controller selection. If torque needs to be controlled, a controller with a current loop control needs to be specified. If the application calls for a high bandwidth servo control loop, a full four-quadrant controller must be chosen.
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