DJPZ-300 Series Motor Disc Brakes

The DJPZ-300 series motor disc brakes are a compact, integrated, and high-performance braking system designed for direct mounting on motor shafts. They are typically spring-applied, fail-safe brakes, with common actuation methods being electromagnetic or electro-hydraulic. Based on the naming convention, here is a description of their typical design and functionality:

Core Operating Principle:

This series is a spring-applied, de-energized-to-brake (fail-safe) disc brake. While the exact actuator can vary, a common configuration is an electromagnetic or electro-hydraulic release mechanism​ integrated into a disc brake caliper unit.

Normal State (Brake Applied):​ Powerful internal disc springs (or multiple coil springs) apply force, clamping the friction pads directly against a brake disc (rotor) that is mounted on the motor shaft. This holds the motor shaft and connected load securely stationary.

Release (Energized):​ When the brake's actuator (e.g., electromagnetic coil or electro-hydraulic thruster) is energized, it generates a force to compress the brake springs. This retracts the friction pads from the disc, releasing the brake and allowing the motor shaft to rotate freely.

Apply (Fail-Safe, De-energized):​ Upon loss of power to the actuator, the force holding the springs compressed is removed. The stored spring energy immediately forces the pads back onto the disc, automatically applying the full braking torque. This ensures safety in the event of a power failure.

Key Features:

Model Designation:

DJPZ-300:​ "DJPZ" is the model series prefix, where "D" often stands for "Disc" and "PZ" may indicate a specific integrated design. The number "300" typically denotes a key specification, most commonly the rated static braking torque in Newton-meters (Nm). Therefore, this series provides approximately 300 Nm​ of holding torque.

Disc Brake Design:

Uses a stationary caliper​ and a rotating disc (rotor). This design offers superior heat dissipation, stable friction performance, and easier pad inspection/replacement compared to drum brakes.

High Torque Density:​ Provides a high braking force relative to its compact size and weight.

Spring-Applied, Fail-Safe:​ The primary safety feature. The brake is held engaged by spring force and requires continuous power to the actuator to stay released, guaranteeing automatic engagement during power loss.

Zero Backlash Holding:​ Once engaged, the brake provides a rigid, direct clamp on the disc with no slip, ensuring precise positioning and secure holding.

Compact & Integrated Design:​ Engineered for direct flange-mounting onto a standard IEC or NEMA motor frame. The actuator, springs, and caliper are housed in a single, sealed unit, simplifying installation and saving space.

Fast Response:​ The short stroke of the friction pads and direct actuation enable very rapid engagement and release times (typically in milliseconds), ideal for precise control and emergency stops.

Manual Release:​ Standard feature, usually a manual release screw or lever, to disengage the brake for maintenance or manual positioning without power.

Sealed Construction:​ Often features sealed bearings and shaft seals (IP65 or similar) to protect internal components from dust, moisture, and contaminants.

Typical Applications:

These brakes are ideal for applications requiring secure holding, precise stopping, and compact integration with electric motors:

Servo, stepper, and standard AC/DC motor brakes​ on CNC machines, robots, and automated axes.

Holding brakes​ for vertical Z-axes, spindle stops, and indexing tables.

Emergency/safety brakes​ on conveyors, lifts, winches, and material handling systems.

Packaging, printing, and textile machinery​ requiring rapid, reliable stopping.

Summary:

The DJPZ-300 series is a compact, high-performance, spring-applied motor disc brake. It is designed for direct, space-saving mounting on motor shafts​ and provides 300 Nm of reliable, fail-safe holding torque. By combining the safety of a spring-applied mechanism​ with the excellent performance of a disc brake, it is a preferred solution for modern industrial automation and motion control applications where safety, precision, and integration are critical.

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