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whats the difference between brushless rcs and brushed?
And got the following answer:
It has to do with the motor. There is no comparison between a brushed and a brush-less motor. There is a huge increase in power, efficiency etc. They have an extremely high power to weight ratio. While these systems are in relatively the same price range, they each have their own pros and cons. A brushed system needs a lot of maintenance, but offers more flexibility because you can change motors depending on track conditions (how much torque you need). A brush-less system on the other hand, needs almost no maintenance. There are two basic decisions you need to make when buying a brush-less system. How much can you afford to spend and how many transmission gears you want to replace. And the start of an excellent article from thinkrc.com which you should read in its entirety What is the difference between a brush-less motor and brushed motor? A Brushed Motor has a rotating set of wound wire coils(armature) which acts as an electromagnet with two poles. A mechanical rotary switch(commutator) reverses the direction of the electric current twice every cycle, to flow through the armature so that the poles of the electromagnet push and pull against the permanent magnets on the outside of the motor. As the poles of the armature electromagnet pass the poles of the permanent magnets, the commutator reverses the polarity of the armature electromagnet. During the instant of switching polarity, inertia keeps the motor going in the proper direction. A Brush-less Motor uses a permanent magnet external rotor, three phases of driving coils, one or more devices to sense the position of the rotor, and the associated drive electronics. The coils are activated, one phase after the other, by the electronic speed controller as cued by the signals from the rotor position sensors. Brushed Motor Pros Two wire control Some are rebuildable for extended life Low cost of construction Simple and inexpensive control No controller is required for fixed speeds Operates in extreme environments due to lack of electronics Brushed Motor Cons Periodic maintenance is required Speed/torque is moderately flat. At higher speeds, brush friction increases, thus reducing useful torque Poor heat dissipation due to internal rotor construction Higher rotor inertia limits the dynamic characteristics Lower speed range due to mechanical limitations on the brushes Brush arcing will generate noise causing electrical magnetic interference (EMI) Brushless Motor Pros Electronic commutation based on position sensors vs mechanical switch for brushed Less maintenance due to absence of brushes Speed/Torque- flat, enables operation at all speeds with rated load High efficiency, no voltage drop across brushes High output power to size ratio. Reduced size due to superior thermal characteristics. Because the windings are connected to the case the heat dissipation is better Higher speed range - no mechanical limitation imposed by brushes/commutator Low electric noise generation (EMI) Brushless Motor Cons Higher cost of construction Control is complex and expensive Electric controller(ESC) is required to keep the motor running which is sometimes more expensive than the motor.