In these modern times, brushed motors found in conventional devices are becoming a bit of an anachronism. What used to be in every device, such as power tools (drills, hammers and saws), fridges, cooling fans, computer hard drives and electric vehicles, has been replaced by something more modern called brushless motors. This has allowed manufacturers to produce and consumers to enjoy what is known as modern electric devices.
Now the world is singing the praises of modern electric devices over conventional ones. But which devices are better? Let us look at the differences in performance, size and cost between modern electric and conventional devices.
Due to their brushless motors, modern electric devices are more efficient than conventional devices. Brushed motors require brushes, commutators and connections to deliver power to the rotor, the component on the motor shaft that causes the motor to spin, while brushless motors get their power delivered directly to the rotor using some type of control circuitry, eliminating the need for brushes.
The first boost in performance comes from the lack of brushes. Brushes are what deliver the current to the commutator contacts of the rotor. When this happens, some of the current is lost to heat. Since the power goes straight to the rotor in a brushless motor, no power is lost, making it more efficient than brushed motors. This also means it takes less juice to power a modern electric device compared to a conventional device.
The control circuitry found on brushless motors gives modern electric devices the ability to automatically control speed/torque. This is thanks to the sensors that are located on the control circuit, allowing it to detect the amount of stress the electric device is going through. If it is under a lot of stress, the motor will spin furiously, and when there is less stress, the motor of the modern electric will spin less.
When contrasted with brushed motors, brushless motors are smaller in size. This means they allow manufacturers to make compact devices without sacrificing speed and performance. This means an electric saw made from a brushed motor would be bigger in size compared to one made with a brushless motor. As you can imagine, a compact electric saw would be easier to handle and take less power (not to mention it would be much more powerful due to the brushless motor). Not only that, brushless motors allow manufacturers to produce mini versions of popular consumer gadgets as well.
Perhaps this is one area where brushed motors have a slight advantage – the fact that they cost less. Because of their control circuitry, brushless motors have a higher initial cost, which they more than make up for in efficiency and durability (no brushes to wear down).
As you can see, brushless motors have ushered in a new generation of modern electric devices that are compact in size and offer better performance. Compared to conventional devices with brushed motors, the praise modern electric devices are getting is well deserved, despite the fact that they cost more. Modern electric devices are taking over, and many manufactures, as well as consumers, have wised up to their benefits and are not looking back.