![]() ![]() It outperforms the initial specs and keeps the motor speed in the required range. ![]() The motor mechanical load has a relatively low inertia and never changes abruptly, only when the whole system is started or shutdown. One timer channel is used for the PWM output and the other for measuring the current motor speed (using a sensor). The closed loop control strategy is implemented using a modified (simplified) PID controller and timing is controlled by the PID tuning parameters. By injecting a small voltage into its feedback chain it is possible to control the regulator's output voltage (withing a small range). Speed control is accomplished by using a BUCK DC-DC converter for regulating the motor's supply voltage. The motor speed is directly proportional to its power supply voltage and inverselly proportional to a fraction of its current consumption (which depends on the load). The low power motor is a sensorless brushless motor which includes a very rudimentary controller.
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