Rc Brushless Motors
Brushless motors have revolutionized the way electric RC models and toys run. Not only are these brushless motors cheaper to manufacture, they are better in terms of life span as well. Today, many electric RC models come fitted with a brushless motor, a change that has made them cheaper and more reliable without losing performance.
Radio control has been in existence since 1898, when Nicola Tesla demonstrated, in front of an audience, an RC boat. The models hit full-scale commercial production in the mid-1950s when there were major advancements in terms of the technology used and applied. Integrated circuit boards enabled manufacturers to make lighter models without compromising on functionality. Electric RC models are, today, the most commonly used radio controlled models even though they lack in performance compared to gas or nitro powered models.
Before the introduction of brushless motors, electric RC models were run solely on a DC motor. The DC motor had a magnet on the outside while the armature spun on the inside of the magnet. Once the armature had spun 180degrees, to continue spinning, the polarity of the magnets needed to be reversed, a process carried out by metallic brushes. These brushes were placed on the armature and when they touched a side of the magnet, they would flip the polarity due to a couple of electrodes connected to them.
This form has its benefits such as a simple working setup and cheaper manufacturing costs. However, there were numerous drawbacks. The brushes would wear out with time and you would need to replace them regularly; there was a great deal of sparking and electrical noise due to the brushes touching the magnets; your RC model's maximum speed would be limited due to the brushes; the electromagnet would be harder to cool down due to its central location, resulting in overheating of your RC model's engine, and finally, there was a limit on the number of poles of the armature due to the placement of the brush, again limiting the performance.
Manufacturers came up with the novel idea of introducing brushless motors or Brushless DC (BLDC) motors where the permanent magnet of the DC motor was placed in the center, on the rotating arm, while the electromagnet was placed around it. Integrated circuit boards, a cheaper computer in a way, controls the motor leading to numerous advantages over the standard D motor.
Brushless motors are more efficient as you can control the motor using the 'computer', which makes it more precise. You don't have to replace any brushes as there aren't any and that also means that there is no sparking or electrical noise. Your model's electromagnet cools easily due to its placement on the outside and for more precise control, you can place a lot more electromagnets.
Of course, all this comes at a slightly higher initial cost but the brushless motor is definitely cheaper over a period of time, requiring lesser maintenance effort and parts replacement. Brushless motors have a superior power to weight ratio and come in a variety of sizes, making them the ideal choice in electric RC airplane models. Brushless motors, due to their more efficient output, allow your RC airplane to rise vertically instead of the usual gradual climb of a normal electric motor.
So the next time you decide to go in for an electric RC model, make sure that you look at a long term solution for maintenance issues and get one with a brushless motor.