Master Guide to Magnetic Particle Brakes and Clutches

Magnetic brakes and clutches are essential components in many machines and systems. They operated based on the principles of magnetism, to control the motion and speed of rotating shafts. Therefore, if you’re looking for a reliable way to control motion in your application, magnetic brakes and clutches are the right choice.

Placid Industries’ electromagnetic clutches and brakes effectively regulate torque transmission between two shafts. One feature is the absence of direct contact between the output disk/shaft and the body. Instead, a narrow gap between them is filled with a fine, dry stainless steel powder. This powder remains free-flowing under normal conditions until a magnetic field is generated by the coil.

We have been a well-established manufacturer of premium brakes and clutches for precise torque and tension control since 1973. We have since expanded to the US, Europe, and Asia, earning a reputation for producing innovative and reliable products. In addition, our commitment to quality and customer satisfaction has helped us establish a loyal customer base across the globe.

Power Supplies for Magnetic Particle Brakes and Clutches

Power supplies play a vital role in operating magnetic particle brakes and clutches. These devices require a constant and reliable current source to adjust the magnetic field necessary for precise torque transmission. The power supply ensures that the magnetic particles within the brake or clutch are adequately magnetized, allowing for efficient torque control.

Maintaining a constant current is crucial because fluctuations can affect the magnetic field strength, resulting in inconsistent torque output. The power supply unit must deliver a steady, uninterrupted current flow to ensure precise and reliable braking or clutching performance.

Functions of Magnetic Particle Brakes and Clutches

Magnetic particle brakes have several functions that make them useful in various industries and applications. These functions include:

Stopping Power

Magnetic particle brakes serve a crucial role in equipment operation by facilitating controlled “slip” rather than simply stopping rotation. This slip feature is particularly valuable in various applications, such as providing the necessary tension to wire winding machines or applying resistance to workout equipment like ellipticals.

Speed Control

By varying the strength of the magnetic field, the resistance force applied to the equipment can be adjusted, resulting in a change in speed. This function is useful in precise speed control applications, such as printing presses or conveyor belts.

Torque Control

In some applications, magnetic particle brakes and clutches incorporate ultrasonic systems, specifically ultrasonic sensors, to determine the required tension within the system. Ultrasonic sensors use high-frequency sound waves to measure the distance between two components. By analyzing the reflected sound waves, the sensor can accurately calculate the tension in the system.

Non-Contact Transmission

While it is true that there is still some minimal friction due to contact with the magnetic particles, the wear and tear associated with magnetic particle brakes are significantly reduced compared to other brake types. As a result, the risk of friction-related issues, such as heat generation or component damage, is effectively eliminated.

On the other hand, the main functions of magnetic particle clutches include the following:

Advantages of Magnetic Particle Brakes and Clutches

Here are some of the benefits of magnetic particle brakes and clutches:

Fast Response Time

Rapid acceleration and deceleration of rotating equipment are necessary for many industrial applications. Magnetic brakes and clutches can respond quickly to changes in current, allowing for precise control of motion with minimal delay.

Noise- and Vibration-Free

Compared to traditional mechanical brakes and clutches, magnetic particle systems exhibit lower levels of noise and vibration. While it is true that there is still some degree of friction associated with magnetic particle brakes and clutches, it is significantly less compared to other types. It is worth noting that hysteresis brakes are particularly known for their minimal friction and noise characteristics.

Safety Features

Magnetic particle brakes and clutches have built-in safety features that prevent the system from overheating or failing in case of a power failure. This improves overall system reliability and reduces the risk of accidents and downtime.

Key Considerations in Selecting Magnetic Particle Brakes and Clutches

Choosing the right magnetic particle brake or clutch for an application requires careful consideration of various factors. The following are some of the key factors to consider:

Heat Dissipation

The resistance force generated by the magnetic field converts kinetic energy into heat, which is then dissipated through the brake system. This function is essential in preventing equipment damage due to overheating and ensuring reliable and efficient operation.

Torque Requirements

The torque required will depend on the load being controlled and the speed of operation. The brake or clutch must provide enough torque to stop or control the load safely and efficiently.

Speed and Frequency

The brake or clutch must operate at the required speed and frequency without overheating or failing. Therefore, choosing a brake or clutch that can withstand the application’s specific speed and frequency requirements is crucial.

Ambient Conditions

The ambient conditions of the application environment — such as temperature, humidity, and dust — must be considered when selecting a magnetic brake or clutch. The brake or clutch must operate under the specified conditions without failure or reduced performance.

Mounting and Space Constraints

The brake or clutch must be mounted securely and correctly to ensure proper operation and prevent damage to the equipment. Additionally, space constraints must be considered to ensure the brake or clutch can fit within the available space.

Durability and Maintenance

Magnetic brakes and clutches must withstand the expected operating conditions and require minimal maintenance to ensure optimal performance and long service life.


It is important to balance cost and quality when selecting magnetic brakes or clutches. Selecting a higher-quality brake or clutch may result in a higher initial cost, but it can provide better long-term value and reduce the risk of failure and downtime.

Why Choose Placid Industries

Here are the top reasons you should work with Placid Industries for your magnetic brakes and clutches:

Superior Quality Products

At Placid Industries, our products are engineered to last, with rigorously tested materials to ensure they meet or exceed industry standards. In addition, our precision machining processes and strict quality control measures ensure that every product that leaves our facility is of the highest possible quality.

Speedy Delivery

We understand that time is money, so we offer fast turnaround times of 24-48 hours on our magnetic particle clutches and brakes. In addition, our manufacturing processes are optimized for efficiency, so we can deliver your order quickly without sacrificing quality.

Diverse Clientele

Our products have been tested and proven in some of the most demanding industrial environments. Therefore, you can be confident they will perform reliably in your application.

Attentive Customer Service

At Placid Industries, we are committed to providing the best possible customer service. From the moment you contact us, our knowledgeable and friendly staff will work with you to understand your needs and provide the support you require. Whether you need help selecting the right product, troubleshooting an issue, or anything in between, we are here to help!

Competitive Pricing

We understand the importance of cost-effectiveness in the modern business environment. Therefore, we offer competitive pricing for our products without compromising on quality. Our affordable rates make us attractive to customers looking for high-quality magnetic particle brakes and clutches that won’t break the bank.

Wide Range of Products

Placid Industries offers a wide range of magnetic particle brakes and clutches products to meet the needs of various industries. The company’s products include hysteresis brakes, magnetic particle clutches, magnetic particle brakes, and more.

Ready to get started on your next project? Contact us or request a quote today!