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What is a BLDC motor?

CubeMars / 2023-09-15 14:04:49

What is a BLDC motor?

The Brushless DC Motor (BLDC Motor), commonly referred to as a BLDC motor, is a common type of motor used in robotics. It is powered by a direct current voltage source and utilizes electronic commutation, as opposed to traditional DC motors that rely on brush commutation. Today, BLDC motors have gained popularity over traditional DC motors due to their advantages, particularly in applications that require high efficiency and long lifespan, such as in robotics.

Differences between BLDC and DC motors:

The most significant difference between BLDC motors and traditional DC motors lies in the type of commutation. DC motors use carbon brushes for this purpose. The drawback of these brushes is that they wear out quickly. This is why BLDC motors employ sensors, typically Hall sensors, to measure the rotor's position and serve as switches on a circuit board. Sensor input measurements are processed by the circuit board, allowing for accurate calculation of the correct moment for commutation when the rotor rotates. Meanwhile, the use of carbon brushes and brushes in DC motors results in significant differences in terms of efficiency and maintenance compared to brushless DC motors.

Key features of Brushless DC motors:

①High Efficiency: BLDC motors are generally more efficient than brushed DC motors since they don't require carbon brushes to facilitate current transfer, reducing energy loss.

②High Torque Density: BLDC motors can provide high torque output, making them suitable for tasks requiring high torque in robotics.

③Long Lifespan: Due to the absence of friction-inducing carbon brushes and brushes, brushless DC motors typically have a longer lifespan and lower maintenance requirements.

④High-Speed Operation: Brushless DC motors can operate at high speeds, making them valuable in applications requiring rapid responses and high-speed motion.

⑤Precise Control: BLDC motors are typically controlled through electronic controllers, enabling high-precision speed and position control, which is essential for applications demanding precise motion control in robotics.

Common applications for BLDC motors include robot propulsion, aircraft propulsion systems, medical devices, industrial automation, and electric vehicles, among others. Their control typically involves using dedicated electronic controllers and sensors to achieve the desired motion and performance. In summary, brushless DC motors offer advantages in many applications, particularly those requiring high efficiency, high-speed capabilities, long lifespan, and precise control. The choice between motor types depends on the specific requirements and performance needs of the application.

BLDC motor product introduction:

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