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What is Coreless DC Motors: How Does It Work?

In the vast world of motors, the Coreless DC motor stands out as a unique and intriguing innovation.  As technology continues to evolve, the demand for efficient and compact motors has grown exponentially.

Enter the Coreless DC motor, a marvel that has revolutionized the way we think about motor design. Let’s delve deeper into its intricacies.


What is a Coreless DC Motor?

Before we dive into the specifics, let’s first understand what a Coreless DC motor is. Unlike traditional motors that have a solid iron core armature, the Coreless DC motor, as the name suggests, lacks this core.

Instead, it uses a winded coil or a printed circuit board stator to generate

Coreless DC Motor

the magnetic field. This absence of a core results in a lightweight design, reduced inertia, and a quicker response time.

Why is it called “Coreless”? The term “coreless” might sound a bit misleading at first. After all, how can a motor function without a core? The answer lies in its unique design.

By eliminating the iron core, which is typically responsible for the magnetic field in traditional motors, the Coreless DC motor relies solely on its windings. This not only reduces its weight but also minimizes the cogging effect, leading to smoother operation.

You can learn more about coreless dc motors here:All about coreless dc motor


Coreless DC Motor Types

When we talk about Coreless DC motors, it’s essential to understand that they come in various types, each designed to serve specific applications and needs.

1. Disc Wound

This type is characterized by its flat, disc-like winding. The windings are placed in a radial pattern, allowing for a compact design. Disc wound motors are often used in applications where space is a constraint, such as in watches or small electronic devices.

2. Cylindrical Wound

As the name suggests, these motors have a cylindrical winding. This design offers a higher torque compared to the disc wound type and is commonly found in applications like medical devices and robotics.

3. Pancake Motors

These are a variation of the disc wound motors but are designed to be even more compact. They are ideal for applications that require a flat design, such as in cameras or drones.


Application of Coreless Motor

The unique design and features of the Coreless DC motor make it suitable for a wide range of applications. Its lightweight nature, combined with its rapid response time, has made it a favorite among many industries.

1. Medical Devices

Precision is paramount in the medical field. Coreless motors, with their smooth operation and quick response, are often used in medical devices like infusion pumps and surgical instruments.

2. Robotics

In the world of robotics, efficiency and precision are key. The Coreless DC motor’s ability to provide high torque with minimal weight makes it an ideal choice for robotic arms and legs.

3. Aerospace

Weight is a critical factor in aerospace applications. The lightweight nature of the Coreless DC motor, combined with its efficiency, makes it a preferred choice for drones and other aerospace equipment.

Click to learn: Application areas of coreless DC motors


How Coreless DC Motor Works

Understanding the workings of the Coreless DC motor requires a deep dive into its design and the principles that drive it. Let’s dissect its operation in greater detail.

Coreless DC Motor

1.The Basic Principle

All motors, at their essence, operate on the principle of electromagnetism. When an electric current flows through a coil, it induces a magnetic field.

In the case of the Coreless DC motor, this magnetic field is generated without the interference of a solid iron core.

Instead, the windings themselves produce the necessary magnetic field. This field then interacts with the permanent magnets placed strategically around the coil, causing the motor to rotate.

2. Winding Design

The design of the winding plays a crucial role in the motor’s operation. In Coreless DC motors, the windings are either disc wound or cylindrical wound.

The disc wound design spreads out the windings in a flat, radial pattern, while the cylindrical wound design wraps the windings in a cylindrical shape.

This specific design ensures that the magnetic field is evenly distributed, leading to consistent torque and smoother operation.

3. Elimination of Cogging

Cogging, a phenomenon observed in traditional motors, is the jerky motion caused by the magnetic attraction between the iron core and the permanent magnets. This can lead to inefficiencies and wear and tear over time.

The Coreless DC motor, with its absence of an iron core, inherently eliminates this issue. The result is a motor that runs more smoothly, with less vibration and noise.

4. Quick Response and Reduced Inertia

One of the standout features of the Coreless DC motor is its rapid response time. Traditional motors, with their iron cores, have a higher inertia, which means they take longer to accelerate or decelerate.

The lightweight design of the Coreless DC motor, devoid of this heavy core, allows it to achieve higher RPMs in a fraction of the time. This is especially beneficial in applications that demand quick changes in speed or direction.

5. Enhanced Efficiency

In traditional motors with iron cores, these eddy currents can lead to significant energy losses. The Coreless DC motor, with its lack of an iron core, inherently reduces these losses.

This not only makes the motor more energy-efficient but also ensures it runs cooler, extending its lifespan.



The Coreless DC motor is a testament to the wonders of engineering and innovation. Its unique design, which eliminates the traditional iron core, offers a plethora of advantages, from reduced weight to increased efficiency.

Whether it’s in the precise world of medical devices, the demanding realm of robotics, or the vast skies navigated by drones, the Coreless DC motor has found its place, proving its worth time and again.

In a world that’s constantly evolving and seeking better solutions, the Coreless DC motor stands as a beacon of progress. It challenges the norms, pushes boundaries, and showcases that sometimes, thinking outside the ‘core’ can lead to groundbreaking advancements.

As we continue to explore and innovate, one thing is certain: the Coreless DC motor will remain at the forefront of motor technology, driving us towards a brighter and more efficient future.

If there is anything else you don’t understand, you can click here to contact us at Donghui Motor, and we have professional staff to answer your questions.

Post time:Sep-25-2020

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