Electric tools usually use brushed motors, but brushless motors are not enough?
Why do electric tools (such as hand drills, angle grinders, etc.) generally use brushed motors instead of brushless motors? To understand, this is really not something that can be explained in just one or two sentences.
DC motors are divided into brushed motors and
brushless motors
Pros and Cons Comparison
DC brushed motor: fast starting, timely braking, smooth speed regulation, simple control, simple structure, and low price. The key is cheap! attractive price! attractive price! Moreover, the starting current is large, and the torque (rotational force) is high at low speeds, which can bear heavy loads.
However, due to the friction between the carbon brush and the commutator, DC brushed motors are prone to sparks, heat generation, noise, electromagnetic interference to the external environment, low efficiency, and short lifespan. Because carbon brushes are consumables, they are prone to malfunction and need to be replaced after a period of use.
DC brushless motor: Due to the elimination of carbon brushes, DC brushless motors have low noise, maintenance free, low failure rate, long service life, stable operation time and voltage, and minimal interference with wireless equipment. But it's very expensive! costly! costly!
Functions of electric tools
Electric tools are very commonly used tools in daily life. There are numerous brands and fierce competition. Everyone is very sensitive to prices. And electric tools need to carry heavy loads and must have a large starting torque, such as hand drills, impact drills, etc. Otherwise, during drilling, it is easy for the motor to malfunction due to the drill bit getting stuck.
Imagine that brushed DC motors have low prices, high starting torque, and can carry heavy loads; Although brushless motors have a low failure rate and long lifespan, they are expensive and their starting torque is far inferior to that of brushed motors. If given the choice, how would you choose? I think the answer is self-evident.
