RC Car Tips Nitro. RC Nitro Engine will not start. How to clean a nitro engine air filter. RC nitro car engine seized or stuck. Break-in procedure of an RC Nitro engine. RC Car Tips Electric. How to get started in RC Car racing. Simple Guide to RC Gearing. How to remove worn tires from rc car rims. Brushed motor v brushless motors.
Li-Po batteries for electric RC Cars. Are there any disadvantages to brushed motors? Not in terms of performance, but there are disadvantages in design and construction. The electronic controller in a brushless motor requires more design work upfront and is much harder to manufacture.
This increases the cost of brushless motors compared to the older brushed design. Less powerful, shorter life, and heavier — why would anyone ever opt for a brushed motor over a brushless one?
There are a few reasons: cost, torque, water resistance, and limited power. Brushless motors take more design and programming work to make them function.
The simplicity and low cost of brushed motors make them great for entry-level RC vehicles. If you want all-out speed, brushless motors are the way to go. If you need low-range power to move an RC vehicle from a dead stop, brushed motors are fine. Brushed motors are great in rock crawlers that have very low gearing. These little brutes have big tires to crawl up rocks and other obstacles. They are designed to move slowly through obstacles. If a brushed motor gets wet, you can open it up and let it dry out.
All the parts are sturdy metal or carbon; once the brushed motor has dried out, it will run just fine. Brushless motors include a circuit board. You can waterproof the case around the motor, but if anything goes wrong, the motor is fried. Stick with brushed motors for wet, muddy RC fun. You may want to stick with brushed motors for RC boats, as well.
Brushless motors are available for boats, but why take chances? Even the best seals on water-proof engine compartments can fail sometimes. It seems odd to think that limited power could be an advantage of brushed motors, but that is sometimes the case. That is…not a recipe for success. RC vehicles can be the same way. If you are just starting out, a vehicle with the most powerful brushless motor can be hard to control.
If you are still learning to control the car, a brushless engine just means you crash that much harder when you lose control of the car. Likewise, if you are striving for maneuverability and control over speed, a brushed motor can be fine. The top-end RC motors are brushless. They are the best motors for serious RC hobbyists. If you want lighter weight, more power, and speed, or longer life in your vehicle, brushless motors are the way to go.
Brushless motors shine for racing, especially on paved surfaces. Racing is a kind of driving where every last little bit of speed matters. When you are just starting out with RC vehicles, brushed motors are fine. They brushed motor will cost less and let you get started learning how to operate the vehicle. If you are running a car on a paved surface — especially if you are racing — you will probably want to upgrade to a brushless motor fairly soon.
You can work on technique and control for a while. Once you are really good at driving, that is the time to switch to a brushless motor.
Many RC vehicles have removable motors. That means that, when you are ready, you can make the jump from a brushed to a brushless motor easily. There is a little more work than just swapping motors, but this lets you keep your initial investment in the car itself, and just spend the cash for an upgraded motor.
This is a terrific option to use as your skills grow. Be aware that you will have to do some soldering to make the changeover. You also have to replace the electronic speed controller when you switch motors. If you have never done this, it can seem a little intimidating. One of the advantages of brushed motors is they are fairly simple and reliable.
They provide a basic two-wire control. This makes it ideal for entry-level cars and new users. Even with their simplistic control, this type of RC motor gives more power for tight, tactical driving. This means that it is easier for brushed RC cars to maneuver through rough terrains compared to RC cars with brushless motors because they have less or minor external components.
In addition to their simplistic control, brushed motors are also great for beginners because the prices of brushed motors are far more affordable when compared to brushless motors. This may be because they lack electronic elements, or for reasons that you can read about below. DC brushed motors are also highly configurable. You can modify them to get the exact speed that you want with the voltage that you use.
The main disadvantage of brushed motors is their low power efficiency. The brush design explains this reduced power level.
The mechanical limitation of the brushes causes the motor to offer lower speed range than the brushless. To add to that, there is a lot of electrical and electromagnetic noise due to the constant switch of the commutator, brushes and shafts. Due to the perpetual contact of the elements inside the motors, heat loss is high and the rotational force is less.
Another negative of brushed motors is that the brushes can wear out after a while, so periodic repairs and replacements are necessary. The windings are located on the stator instead of the rotor, and the magnets are placed on the rotor. This unique design eliminates the needs for brushes all together. Besides the external rotor, a brushless motor uses three phases of driving coil and an additional sensor device to sense the position of the rotor and the drive electronics.
It also makes use of an amplifier that is triggered by an electronic device such as an optical encoder to create a magnetic field inside the motor. As you can see from the explanation above, electronic commutation with brushless motors is created based on the position sensors instead of the mechanical rotary switch. While brushed motors tend to deteriorate quicker and not last as long, brushless motors are quite the opposite.
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