TJ2-100/100 Series Electromagnetic Drum Brakes

The TJ2-100/100 Series Electromagnetic Drum Brakes are a classic, widely used type of industrial braking system. They operate on an electromagnetic principle and are typically designed for fail-safe, spring-applied action. Here is a description of their main 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, where the braking force is provided by strong internal springs, and an electromagnetic coil is used to release the brake.

Normal State (Brake Applied):​ Without electrical power supplied to the coil, the force of powerful internal brake springs forces the brake shoes outward against the inner surface of the brake drum, applying full braking torque and holding the shaft stationary.

Release (Energized):​ When DC voltage (e.g., 220V DC) is applied to the electromagnetic coil, it generates a magnetic field. This magnetic force attracts and moves an armature plate, compressing the brake springs via a lever or linkage mechanism. This action retracts the brake shoes from the drum, releasing the brake.

Apply (Fail-Safe, De-energized):​ When electrical power to the coil is cut off, the magnetic force disappears. The stored energy in the compressed brake springs immediately forces the armature back, re-clamping the brake shoes onto the drum, automatically and safely engaging the brake.

Key Features:

Model Designation:

TJ2:​ Indicates the brake series and design.

100/100:​ The first "100" typically refers to the static braking torque rating (e.g., 100 Nm). The second "100" often specifies the electromagnetic thruster or coil model/size used for actuation.

Electromagnetic Actuation:​ Direct use of an electromagnetic coil and armature for release. This provides very fast response times (typically 0.1 to 0.3 seconds for release/apply) and a simple, robust on/off control interface.

Spring-Applied, Fail-Safe:​ The defining safety feature. Brake engagement is automatic upon loss of electrical power, ensuring the machinery is held securely in a power-off situation.

Automatic Wear Compensation:​ Most models include an automatic adjustment device (often a ratchet or threaded mechanism) to maintain the correct air gap between the armature and the electromagnetic coil, as well as between the shoes and the drum. This ensures consistent performance as the friction linings wear.

Drum Brake Construction:​ Uses internal expanding shoes. Durable cast iron construction is common for the shoes, levers, and base. Heat dissipation is managed by the brake drum.

DC Operation:​ Typically designed for direct current (DC) power supply, which provides a constant magnetic field for smooth, chatter-free operation. AC models may use rectifiers.

Typical Applications:

These brakes are a standard, cost-effective solution for a wide range of industrial machinery requiring reliable holding, especially on electric motor shafts. Common uses include:

Motor brakes​ for overhead crane travel, hoist, and trolley drives.

Holding brakes​ for conveyor systems, machine tools, and packaging machinery.

Emergency/stop brakes​ on winches, lifts, and material handling equipment.

Summary:

The TJ2-100/100 Series is a reliable, fail-safe electromagnetic drum brake. Its operation is straightforward: power on to release, power off to brake. It combines the safety of automatic spring-applied braking with the simplicity and speed of electromagnetic actuation. It is a mature, widely adopted technology valued for its durability, safety, and ease of integration into standard electrical control circuits for industrial drives.

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