Frameless brushless DC motor

It is typically over 10 times longer, depending on operating conditions and brush materials.

While a brushed motor's lifespan is limited by brush/commutator friction and electrical spark wear, a brushless motor's lifespan is determined by bearing grease degradation and electronic circuit longevity. Brushed motors average 200 to 1,000 hours, whereas brushless motors can last for several thousand hours or more.

The primary disadvantages are higher upfront costs compared to brushed DC motors, and the need for a dedicated driver (drive circuit).

Brushless DC motors cannot operate simply by connecting a power supply directly to them. Because an IC and PCB are required to control current switching, the initial cost is higher than that of brushed DC motors.

To precisely switch the direction of the coil current in sync with the rotor's position.

Unlike brushed DC motors, they lack mechanical contacts that automatically switch the current. An electronic circuit must perform this function to maintain motor rotation.

The rotation speed is controlled by finely switching the timing of the electrical current.

Specifically, increasing the voltage results in higher speeds, and decreasing it results in lower speeds. PWM and VSP control are the primary methods used for this speed adjustment.

They are widely used in drones, air conditioners, refrigerator compressors, cordless vacuum cleaners, and electric vehicle (EV) drive units.

Because they lack wearing parts (brushes), they feature long service life, quiet operation, and high efficiency. These characteristics make them an essential power source for products requiring these three features.