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The Difference between DD Brushless Motor And BLDC Brushless Motor

Views: 0     Author: Site Editor     Publish Time: 2024-02-19      Origin: Site


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DD brushless motor and BLDC brushless motor are both common technologies in the field of motors. They both utilize brushless technology, offering advantages in improving motor efficiency, reducing power consumption, and minimizing noise. However, there are significant differences between the two. Let's delve into their distinctions in detail.

BLDC motor, short for Brushless DC Motor, is also known as Permanent Magnet Synchronous Motor. It employs electronic commutation technology, eliminating the need for brushes and commutators, thus offering advantages such as high efficiency, low noise, and minimal maintenance. Its rotor is equipped with permanent magnets, while the stator contains multiple coils. By sensing the rotor position and controlling the current to the coils in the appropriate sequence, electronic devices can drive the rotor to rotate. This type of motor finds wide applications in fields such as power tools, household appliances, automotive components, and drones.

High Efficiency: BLDC motors are more efficient compared to traditional brushed motors. Because brushed motors require frictional operation, they are more prone to heat and energy loss, as well as wear and tear. BLDC motors, on the other hand, achieve high efficiency rotation without brushes.

Low Noise: BLDC motors operate without brushes, so they do not produce buzzing sounds during operation. This means that when BLDC motors are running, their noise levels can be significantly reduced, thereby minimizing noise pollution.

High Reliability: BLDC motors are more reliable than traditional brushed motors. Brushed motors require frequent replacement and maintenance, whereas BLDC motors do not require such upkeep. BLDC motors also lack contact points, making them more durable.

Programmable: BLDC motors can be programmed using electronic speed controllers. This makes BLDC motors highly flexible and applicable in various settings. Programs can be written to ensure stable motor operation under different loads and speeds.

Energy Saving: BLDC motors save more energy by eliminating energy wastage. They consume much less energy than brushed motors, making them more energy-efficient.

Advantages and Disadvantages of BLDC Motors:


High Efficiency: Reduced energy loss due to the absence of brushes and commutators.

Longer Lifespan: Reduced friction and heat loss without brushes and commutators lead to longer motor life.

High Power Density: Without brushes and commutators, motors can be more compact and lightweight.

High Speeds: Without brushes and commutators, motors can achieve higher efficiency at high speeds.

Precise Control: Electronic controllers allow for more precise motor control.


Requires Electronic Controllers: BLDC motors require electronic controllers to control speed and direction.

Higher Cost: Manufacturing costs for BLDC motors are typically higher than traditional motors.

Higher Starting Torque: BLDC motors require higher starting torque at low speeds, or else they may experience difficulty starting up.

DD motors, also known as Direct Drive Motors, or Slotless DC Motors, are a special type of motor that operates without the need for a gearbox or transmission belt for speed reduction. They can directly utilize the torque provided by the motor rotor to drive the load. DD motors typically offer advantages such as high efficiency, high precision, low noise, and low vibration, making them suitable for applications demanding precision, stability, and quick response times, such as aerospace, precision tools, medical equipment, and robotics.

Functional Characteristics of DD Motors:

High Efficiency: DD motors eliminate energy loss associated with transmission systems found in traditional motors, leading to increased efficiency. This allows DD motors to provide higher power output within a smaller volume and weight range.

High Speed: DD motors can achieve high speeds, especially at no-load conditions, due to the absence of a reduction mechanism.

Low Noise: The absence of gears in DD motors reduces mechanical noise generation.

Precision: DD motors offer high control precision, enabling accurate adjustment of motor speed and position to meet the demands of high-precision applications.

High Reliability: With no reduction mechanism, DD motors experience reduced mechanical failures. Additionally, their simple electrical control helps minimize electrical component failures.

Energy Savings: Due to their high efficiency, DD motors save energy and reduce electricity costs.

Low Maintenance Costs: With no reduction mechanism, maintenance costs for DD motors are typically lower compared to other types of motors.

Advantages and Disadvantages of DD Motors:


High Efficiency: DD motors, lacking brushes, reduce energy loss, enhancing motor efficiency.

High Torque: DD motors can provide higher torque at low speeds, enhancing their startup capability.

High Precision Control: Internal sensors in DD motors can sense motor operation, enabling precise control through feedback controllers.

Quiet Operation: Without brushes, DD motors operate quietly, minimizing noise from brush-to-rotating part contact.

Long Lifespan: DD motors boast long electronic component lifespans, low maintenance costs, and high system reliability.


Higher Cost: Designing and manufacturing DD motors tend to be more expensive than traditional motors.

Poor Natural Cooling: DD motors generate significant internal heat during operation and may require effective cooling measures due to poor natural cooling.

Induction Noise: DD motor sensors may produce induction noise, though it's insignificant due to the motor's quiet operation.

System Complexity: DD motors require complex control systems to leverage their features, potentially increasing design and maintenance complexity.

In summary, DD motors are a high-performance and efficient motor type, particularly suitable for industrial and high-precision applications.

Differences Between BLDC Motors and DD Motors

BLDC motors and DD motors are both types of direct current motors, but they have some differences.

Operating Principle

BLDC motors are brushless motors that utilize electronic speed control technology to regulate the motor's speed and direction. The rotor of a BLDC motor contains permanent magnets, and the motor rotates by alternately energizing coils to create a changing magnetic field. In contrast, DD motors use brushes to control the motor's direction and speed.

Speed Control Methods

BLDC motors can adjust the motor's speed and direction through PWM (Pulse Width Modulation) control. The motor control system can precisely regulate the motor and maintain a stable speed. On the other hand, the speed of DD motors is more fixed and requires a speed controller to adjust the speed.

Maintenance Differences

Due to the absence of brushes and brush wear in BLDC motors, they have a longer lifespan and require simpler maintenance compared to DD motors.

In summary, BLDC motors offer higher efficiency and more stable speed control, while DD motors are cheaper and easier to maintain, making them suitable for low-power and cost-sensitive applications.

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