JZ-500 Series Electromagnetic Drum Brakes

The JZ-500 series electromagnetic drum brakes are a robust, fail-safe industrial braking system designed for applications requiring reliable stopping and secure holding. Based on common designations and principles, here is a description of their typical features and operation:

Core Operating Principle:

This series operates on a fail-safe, spring-applied, and electromagnetically released​ principle. It is a normally-closed​ brake, meaning the braking force is always applied by default and requires an electrical signal to release.

Normal State (Brake Applied):​ In the absence of electrical power, powerful internal springs force the brake shoes outward against the inner surface of the brake drum. This applies the full braking torque, holding the connected shaft (and the driven load) stationary.

Release (Energized):​ When the rated DC voltage is applied to the electromagnetic coil, it generates a strong magnetic field. This magnetic force attracts and pulls an armature plate, which, through a lever mechanism, compresses the brake springs. This action retracts the brake shoes from the drum, releasing the brake and allowing the shaft to rotate freely.

Apply (Fail-Safe, De-energized):​ When electrical power is removed, the magnetic field collapses. The stored energy in the compressed brake springs immediately forces the armature plate back to its original position, which re-clamps the brake shoes onto the drum, automatically and safely engaging the brake.

Key Features:

Model Designation:

JZ:​ A common Chinese industrial standard prefix for electromagnetic drum brakes.

500:​ Typically indicates the rated static braking torque (e.g., 500 Nm). It defines the holding capacity of the brake.

Electromagnetic Actuation:​ Uses a DC-powered electromagnetic coil to generate the release force. This provides simple, fast, and direct on/off control, with response times usually under 0.3 seconds.

Spring-Applied, Fail-Safe:​ The primary safety feature. The brake engages automatically upon any loss of electrical power, ensuring the machinery is held securely, preventing unintended movement. This is critical for overhead lifting and safety applications.

Automatic Wear Compensation:​ Incorporates an automatic adjustment mechanism (often a ratchet or threaded adjuster) that maintains the optimal air gap between the armature and the electromagnetic core as the friction linings wear. This ensures consistent release times and braking performance throughout the brake's service life.

Durable Drum Brake Construction:​ Features robust cast iron or steel components for the brake shoes, lever system, and base frame. The design is built to withstand demanding industrial environments involving dust, vibration, and variable loads.

Heat Dissipation:​ The brake drum helps to dissipate the heat generated during braking, though continuous slip applications are not its primary design purpose.

Typical Applications:

These brakes are standard components for electrically driven machinery where secure, zero-power holding is required. Common applications include:

Travel, trolley, and hoist brakes​ on overhead cranes, gantry cranes, and monorail systems.

Motor shaft brakes​ for conveyor drives, winches, and material handling equipment.

Holding brakes​ for machine tools, textile machinery, and other industrial drives.

Summary:

The JZ-500 series is a dependable, spring-applied electromagnetic drum brake. It provides a simple and effective fail-safe braking solution: it is released when energized and applied when de-energized. Its robust drum brake design, combined with automatic wear adjustment, makes it a widely used, cost-effective choice for safety and holding functions in a broad range of industrial motor-driven applications.

Hot Tags: jz-500 series electromagnetic drum brakes, China, manufacturers, supplier, factory, customized