Disadvantages of brushed motors
(1) The friction is large, the loss is large
Old model friends have encountered this problem when playing with brushed motors before. After using the motor for a period of time, the motor needs to be turned on to clean the carbon brushes of the motor, which is time-consuming and laborious, and the maintenance intensity is no less than a home cleaning.
(2) High heat generation and short life span
Due to the structure of the brush motor, the contact resistance between the brush and the commutator is very large, which causes the overall resistance of the motor to be large and easy to generate heat. The permanent magnet is a thermal element. If the temperature is too high, the magnet will demagnetize , The performance of the motor is reduced, and the life of the brushed motor is affected.
(3) Low efficiency and low output power
The heat problem of the brushed motor mentioned above is largely due to the fact that the current is done on the internal resistance of the motor, so the electrical energy is converted to heat to a large extent, so the output power of the brushed motor is not high and the efficiency is not high.