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DC Motors: Why and How Brushless is Better

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No matter the application, when it comes to motor technology there are several options. Within DC technology one of the first—and biggest—decisions is whether to choose a brushed or brushless DC motor.

More and more designers are choosing brushless DC (BLDC) motors for a variety of reasons, as this option has become more economically feasible of late. There are a number of benefits to BLDC motors; let’s examine why.

Brushless vs. Brushed DC Motors

Before noting the advantages of a BLDC motor, it’s important to note the distinctions. A BLDC motor is an electric motor which is must be commutated by a drive (control) – power is applied sequentially by the drive to three phases of motor windings whose resulting magnetic field opposes permanent magnets mounted on the rotor. Alternatively, brushed motors use brushes and a commutator to mechanically control the rotation; the windings are on the rotor and the permanent magnets are fixed.

BLDC Motor Benefits

With no brushes or commutator, and therefore fewer parts, the BLDC motor is more reliable; it lasts longer and exhibits less of a chance of wearing down. A BLDC motor can last well over 10,000 hours while providing greater efficiency than a brushed motor. BLDCs are also quieter, and can operate at speeds over 20,000 rpm in loaded and unloaded conditions.

Today’s BLDC Motors

As demands for greater efficiency and cost savings have increased, BLDC motor manufacturers have responded accordingly. As a result, the latest BLDC motors exhibit faster response time and even greater accuracy, with even less electrical noise. Additionally, new technology has created highly stable, sensitive sensors that meet stringent requirements, suiting a range of demanding industries and applications, from HVAC equipment through high-tech robotics.

In the end, brushless DC motors provide greater efficiency, longevity, and reliability, and serve the needs of countless applications, no matter how demanding.

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