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Warner electric brakes are devices that decelerate, stop, or maintain the stopped state of moving components (or machinery). They are mechanical parts that stop or decelerate moving parts in machinery. Commonly known as brakes. Brakes mainly consist of a frame, braking elements, and operating mechanisms. Some brakes are also equipped with automatic adjustment devices for braking element clearance. To reduce braking torque and structural size, brakes are usually installed on the high-speed shaft of equipment, but for large equipment with high safety requirements (such as mine hoists, elevators, etc.), they should be installed on the low-speed shaft near the working part of the equipment.

Warner electric brake introduction

The electromagnet is a key component of electromagnetic brakes, having a significant impact on the performance stability and reliability of electromagnetic brakes. When a vehicle uses brakes continuously while going down a long slope or during emergency braking at high speed, the temperature of the brake's working components rises sharply. When the temperature reaches a certain level, due to mechanical, physical, and chemical factors, the friction coefficient of the brake friction pair decreases, leading to a decline in braking efficiency. This phenomenon is called thermal fade of braking efficiency. The resistance to thermal fade is one of the important indicators for evaluating brake performance. Below, finite element analysis is used to analyze the temperature field of the electromagnet and friction ring at various stages when going down a long slope, and the accuracy of the analysis model and method is verified through experiments.

Warner electric brake working principle

The friction ring rotates together with the brake drum, and the electromagnet is connected to the drive lever via a retaining ring. At the start of braking, the controller sends a braking signal, energizing the electromagnet, which generates electromagnetic attraction and adheres to the friction ring. Since the electromagnet is constrained by the drive lever, it slides relative to the friction ring, and the friction force acting on the electromagnet drives the connected drive lever to rotate around its pivot point. The driven end of the lever opens the two friction shoes of the brake and presses them against the brake drum, generating braking torque. At the end of braking, the electromagnet is de-energized, the attraction and friction forces disappear, and under the pull of the return spring, the friction shoes move away from the brake drum, releasing the brake. Electromagnetic brakes are an ideal automation actuator in modern industry, primarily serving to transmit power and control motion in mechanical transmission systems. They have advantages such as compact structure, simple operation, sensitive response, long life, reliable use, and ease of remote control. They are mainly matched with series motors. Widely used in metallurgy, construction, chemical, food, machine tools, stage, elevator, ship, packaging, and other machinery, as well as in situations requiring braking during power failure (safety).

Warner electric brake usage precautions

1) Use electromagnetic brakes in a completely dry and oil-free state. If the friction surfaces are contaminated with moisture or oil, the friction torque will significantly decrease, and braking sensitivity will deteriorate. To avoid these issues during use, please install a cover. 2) In dusty environments, please enclose the entire brake in a box. Electromagnetic brakes below 60KGM can use the vertical type, and even higher models can use it. 3) Please use specified dimensions for the long shaft used to install the brake. Use one of the specified keys for the installation shaft. 4) Considering factors such as thermal expansion, please keep the thrust on the installation shaft below 0.2MM. 5) During installation, adjust the attraction gap on the machinery to within plus or minus 20% of the specified value. 6) Keep the bracket light; do not subject the brake's bearings to excessive pressure. 7) For assembly screws, please use spring washers, adhesives, etc., to prevent loosening. 8) While maintaining the leads using the frame on the mechanical side, ensure secure connections using terminal blocks, etc.

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