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Brake motors – often referred to as braked motors – are a crucial component in various industrial applications. Their primary function is to stop a motor-driven system quickly and efficiently. A scenario analogous to halting a moving car, the deceleration of an object in motion is a challenging task, particularly for massive and high-speed systems. That’s where motor brakes come into play. Their efficiency and reliability are unparalleled in the realm of motion control systems.
In this article, we will delve into:
- The different types of motor brakes and how they work.
- The features that distinguish each type.
- The range of applications and benefits of these brakes.
Types of Brake Motors
Spring Set Brake Motors
Spring set brakes harness the principles of electromagnetism and mechanical compression to provide power-off failsafe braking. The application of electrical power to an electromagnet coil results in the creation of a magnetic field. This magnetic force pulls an armature across a small air gap, compressing multiple springs located within the magnet housing.
When power is cut off, the springs push back against the armature, which sandwiches a friction lining between the armature and a secondary friction surface, thereby creating a brake torque and effectively halting the rotation of the shaft.
Spring set brakes are versatile and find usage in various applications such as elevators, escalators, wind turbines, cranes, and servo motors. This wide applicability stems from their failsafe braking mechanism which ensures the safety and control of rotating equipment.
Key features of Spring Set Brake Motors:
- Electromagnet and mechanical spring operation.
- Power-off failsafe braking.
- Multiple applications due to reliable braking mechanism.
Electrically Set Brake
In contrast to spring set brakes, electrically set brakes actively apply stopping force when powered. These brakes are commonly found in magnetically actuated motors, providing tight control and serving as a safety stop.
Key features of Electrically Set Brakes:
- Active application of stopping force when powered.
- Common in magnetically actuated motors.
- Provides control and safety stop.
Injection braking, especially DC injection braking, is frequently used when stopping the rotor promptly is essential. This braking method is effective for large rotors or loads with high inertia. It can substitute friction brake systems, requiring only a small module located with the motor switchgear.
DC injection braking operates by applying direct current to the motor stator windings. This creates a stationary magnetic field that applies a torque to the rotor, slowing it down until it comes to a complete halt.
Key features of Injection Braking:
- Efficiently halts large rotors and high inertia loads.
- Reduced maintenance and ease of integration.
- Controlled braking force through applied voltage.
Dynamic braking is a method used to brake a motor by reconnecting it as a generator immediately after it is turned off. The motor’s mechanical energy of rotation is converted into electrical energy, which is dissipated as heat in a resistor.
Dynamic braking is commonly used for DC motors and, to a lesser extent, AC motors. It provides a quick way of stopping a motor and dissipating its energy, albeit without the ability to bring the motor to a complete stop or hold a load once it is stopped.
Key features of Dynamic Braking:
- Conversion of mechanical energy into electrical energy for braking.
- Rapid braking action suitable for DC motors.
- Dissipation of energy as heat in a resistor.
Advantages of Brake Motors
Motor brakes provide numerous benefits. These brakes are low on maintenance due to their lack of mechanical friction. They are incredibly reliable, providing fail-proof braking under varying operational conditions.
Key advantages of Brake Motors:
- Lower maintenance costs.
- Reliability and fail-proof operation.
- Versatility in application.
Motor brakes, or braked motors, are indispensable for controlling the motion of heavy machinery in many industrial applications. With their ability to rapidly halt movement and ensure safety, they provide efficiency and peace of mind to operators. To learn more about motor brakes or explore the best options for your needs, contact us today.
Remember, when it comes to controlling motion, no system can beat the efficiency and reliability of brake motors.