MAB Robotics | Motion Control Technology

MAB Robotics

SLIM Series - Electromagnetic brakes

The MAB SLIM is an ultra thin brake series designed for mobile robotics applications. Brakes are holding when power is off, providing high torque and low power consumption. The series is compatible with MAB MD Series motor controllers and has to be used with an overexcitation controller (included in the set). Brakes can operate in 24-48VDC power supply range and their modularity allows for choosing a holding torque from a wide range of 0.06-38 Nm.

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MAB SLIM Electromagnetic Brake_edited_ed

Electromagnetic brake vs. BLDC motor

While Brushless DC (BLDC) motors do possess inherent braking capabilities, they are primarily designed for smooth and controlled speed changes rather than precise stopping under high loads. The braking effect in a BLDC motor is typically achieved through regenerative braking, a process where the motor acts as a generator, converting kinetic energy back into electrical energy.

However, electromagnetic brakes offer a distinct advantage in applications where the braking process is required even in turned-off applications in contrast to BLDC motors which do not provide holding torque when a controller is disabled.

Braking when the power is off

One of the key advantages of electromagnetic brakes is their ability to operate even without power. In the event of a power failure, relying solely on a BLDC motor for braking might pose a significant risk. Electromagnetic brakes act as a fail-safe mechanism, providing immediate and controlled stopping of the system regardless of whether power is available or not.

This feature can be critical in applications where safety is paramount, such as mobile robotics or industrial automation. The immediate cessation of motion in the event of power loss prevents the system from falling into an uncontrolled state, reducing potential risks and protecting both equipment and personnel.

How does an electromagnetic brake work?

1

When an electrical current flows through the coil wound around the magnetic core, it induces the creation of a magnetic field around the core.

2

The magnetic field interacts with an integral component called the armature, typically made of ferrous material. Depending on the polarity of the magnetic field, the armature is either attracted or repelled.

3

When the brake is engaged, the magnetic field repels the armature, enabling its movement. This repulsion creates a force that opposes the force of mechanical springs.

On the other hand, locking the brake engages when the flow of electrical current interrupts, ceasing the magnetic field and attracting the armature by springs to stop the movement. This action permits the unrestricted motion of the connected object, and this is how the MAB Robotics brake works.

4

The brake works in only two configurations: it is either on or off. To achieve higher energy efficiency, the engagement of the brake needs to be controlled with an external overexcitement controller. The MD Series controllers have implemented support for the MAB overexcitement module.

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Legal note: We are a company registered in Poland. MAB Robotics Sp. z o.o. NIP(VAT): PL7822870297 REGON: 38440292700000; Share capital: 7950 zł