2013年5月12日星期日

What’re the Advantages and Disadvantages of Brushless Motor?

A brushless motor is widely used in many industrial applications, such as hybrid vehicle, electric computers as well as radio control car. But have you ever think about its advantages and disadvantages? Most of the time, we may not concert about this question as we think this is not important for me. It does what it says.

In fact, this is a very important to us. Whether you want to upgrade your RC model or enjoy blood boiling feeling. Just like why we replacement brushed motor with brushless one. So, let’s have a deep look at of these brushless motors.

What are the advantages?

When you ask the question, many people may tell you brushless motors have superior control, precision, and efficiency, as well as much quieter. Yes, that’s right.

High efficient
Brushless motors are more efficient at converting electricity into mechanical power than brushed motors. As it powered by a DC electric source via an integrated inverter/switching power supply, which produces an AC electric signal to drive the motor, additional sensors and electronics control the inverter output amplitude and waveform and frequency.

But in a brushed motor, an electromagnet is mounted on a spinning arm, called an armature or rotor. The armature sits between two magnets set in a horseshoe configuration, collectively called the stator. When power is fed to the electromagnet, the arm moves, aligning the north and south poles of the electromagnet with the opposing poles of the stator.

Quieter
You can reduce noise once you upgrade your radio control model with brushless motors. They genera low noise so you don’t be worries about it you disturb your neighbor.

Long time for using
Due to the absence of brushes, brushless motors alleviating loss due to friction. And in larger models where overheating may be an issue, they are easier to cool. The enhanced efficiency is greatest in the no-load and low-load region of the motor's performance curve.

What are the disadvantages?
For most people who have brushless motor will say brushless motor is expensive. That’s true. But have you think about what cause the problem.

Brushed motors are cheap to produce, but the brushes wear out from rubbing against the contact point and axle. Friction from this contact also impedes performance. For brushless motor, as it appeared later than brushed, regardless of technology or materials, there are big challenges. Also, electric controller is required to keep the motor running. It offers double the price of the motor. The high costs cause the final expensive price. Technology is always in advance, we should believe that higher quality motors will be notified by us.