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Why are micro brushless DC motors & micro brushed DC motors so easy to control?

In the application of motor, micro brushless DC motors & micro brushed DC motors are very easy to control, why so?

Compared with AC motors, micro DC brushless motors &  micro DC brushed motors are powered by direct current, such as batteries or AC/DC power converters. Small brushless DC motors & small brushed DC motors can control the speed by changing the current in the winding of the armature, while AC motors require frequency converters to change the frequency.

The speed control of the micro brushless DC motors & micro brushed DC motors can be understood as the control torque. The torque of the small brushless DC motors & small brushed DC motors are proportional to the current, so the current change in the armature current can smoothly adjust the speed control, and the effect is good and simple.Ac motor is a multivariable strong coupling system, so to control the need for frequency conversion, that is, vector control.

Therefore, the small BLDC motors & small brushed DC motors can control the speed better than the AC motor, and the magnetic field of the DC motor can also control the speed by controlling the excitation current, which is simple and convenient.