PM Brush motor advantages and disadvantages

　Advantages:

a) variable speed is smooth, almost imperceptible vibration;

b) low temperature rise, and good reliability;

c) low price, so to be more manufacturers choose.

Disadvantages:

a) carbon brushes to wear, replacement is a bit trickier, short life;

b) Operating current, motor magnets, demagnetization, the role of the motor and battery life.