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Current Controlled Hysteresis Brakes

Current Controlled  Hysteresis Brakes

Current Controlled Hysteresis Brakes

Product catalog summary
Overview
Current Controlled Hysteresis Brakes are electrically controlled devices that offer precise torque and tension control without wearing parts. They operate on a frictionless design principle, providing advantages such as longer life, superior torque repeatability, and operational smoothness.

Advantages
The design of hysteresis brakes offers several benefits over magnetic-particle and friction devices, including:
  • Frictionless operation with virtually no wear.
  • Longer expected life and superior torque repeatability.
  • Broad speed range and excellent environmental stability.
  • Operational smoothness critical for applications like wire drawing and packaging.

Operating Principles
Hysteresis brakes use a reticulated pole structure and a special steel rotor/shaft assembly. When energized, the air gap becomes a flux field, magnetically restraining the rotor to provide braking or clutching action.

Control
Torque is controlled by adjusting the DC current to the field coil, allowing for precise control from a minimum value to a maximum of 15-35% above rated torque.

Technical Data
The document provides detailed technical specifications for various models, including torque at working current, resistance, voltage, RPM, power dissipation, and dimensions.

Applications
These brakes are used in test benches, actuators, tension control with wire, cable, ropes, threads, paper, and foils. They are also used for start coupling, overload protection, and braking against backlash.

Matched Hysteresis Brakes
These units ensure that every brake of a given model is matched at a pre-determined torque and current point, advantageous for multi-tension control systems.

Air Cooled Hysteresis Brakes
Designed for applications exceeding the power rating of standard brakes, these units offer excellent heat dissipation with compressed air.

PowerPro Programmable Power Supply
This power supply is designed for use with Electric Hysteresis Brakes, featuring real-time display, support for multiple brakes, and various operating modes.

Selection Criteria
The document provides steps to calculate maximum torque, RPM, and power dissipation for selecting the appropriate brake model.

Constant Tension Payoff Stands
Custom designed payoff stands with the PowerPro tension control system allow for "set-and-forget" operation, automatically adjusting tension throughout the payoff process.
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Catalog excerpts

Current Controlled  Hysteresis Brakes-1

Current Controlled Hysteresis Brakes Electrically controlled No wearing parts Infinitely adjustable for precise torque/ tension control TRANSMITTING TORQUE THROUGH AIR

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Current Controlled  Hysteresis Brakes-2

Current Controlled Electric Hysteresis Brakes Advantages The superior design of these hysteresis devices provides several inherent advantages over magnetic-particle and friction devices. They operate on a frictionless design principle with virtually no wear. This provides such advantages as: longer expected life, superior torque repeatability, life-cycle cost advantages, broad speed range, excellent environmental stability and superior operational smoothness. Operating principles The hysteresis effect in magnetism is applied to torque control by the use of two basic components - a reticulated...

 Open the catalog to page 2
Current Controlled  Hysteresis Brakes-3

Used for torque loading and power absorption in test benches, actuators, etc., as well as tension control with wire, cable, ropes, threads, paper and foils at take-up and payoff equipment. Can be used as start coupling for rpm speed up control and as overload protection or braking against backlash. These brakes are noiseless, frictionless and wear free in their operation. Torque is independent from rpm speed. Torque is infinitely adjustable within each brake’s range of operation. DIMENSIONAL DATA SERIES M (all dimensions mm) MODEL 0 A 0 B 0 CEF G H I K 0 L MN TECHNICAL DATA SERIES M MODEL Torque...

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Current Controlled  Hysteresis Brakes-4

Hysteresis Brakes with a large bore are mainly used for tension control at flyer payoff operation equipment, at helical wrapping operation, and braiding applications. These brakes are supplied without bearings and are also available as a “matched” design upon request. The bearings must be provided by the machine designer. The pole/case assembly and the rotor are shipped as separate items and it is the responsibility of the machine designer to ensure proper alignment and concentricity of the mating brake parts in the final assembly. The mounting structure for these parts must be such that concentricity...

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Current Controlled  Hysteresis Brakes-5

AEB air cooled electric hysteresis brakes are used for applications which would exceed the power rating for our standard electric hysteresis brakes. These units offer excellent heat dissipation when compressed air is delivered via the included tubing connection. Units feature a mounting base plate & terminal strip wiring connection for simple integration into your application. DIMENSIONAL DATA (all dimensions mm) FGHI JKLMNOPQR BSPT TECHNICAL DATA MODEL Torque at Working Resistance Voltage RPM Power dissipation Residual Air Air working current current at 25°C VDC max. (Watts) Torque w/o Supply...

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Current Controlled  Hysteresis Brakes-6

PowerPro ™ is a programmable constant current power supply designed for use with our range of Electric Hysteresis Brakes. Operating Modes: - Constant Torque - 0-10VDC input - Ultrasonic Probe input (Open-loop tension control) - Strain Gage (Closed-loop tension control) Features: - Real time display of brake current, torque, & payoff spool diameter. - Support for multiple brakes in parallel (up to max. of 2 Amps) - Support for open-loop & closed-loop tension control. - Emergency stop & brake free contacts included. - HMI networking capability. TECHNICAL DATA Overload Protection Short circuit (or)...

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Current Controlled  Hysteresis Brakes-7

Selection Criteria Example Line Tension (T) Full Spool Radius (r) Spool Core Diameter (d) Line Speed Step 1 - Calculate Maximum Torque Step 4 - Determine Operating Current The line tension multiplied by the radius of a full spool. Example: Full Spool Radius (r) x Line tension (T)= Torque From the product data sheets examine the Performance Curve to determine the approximate operating current. EB-140M-2DS ELECTRIC HYSTERESIS BRAKE PERFORMANCE CURVE TORQUE VS. CURRENT Selection: In this example select Model EB-140 or larger. 1.80 When a magnetic brake shaft is turning, mechanical energy is converted...

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Current Controlled  Hysteresis Brakes-8

Constant Tension Payoff Stands Custom designed, turn-key payoff stands offered in both single and mutlple position configurations. The PowerPro tension control system allows for “set-and-forget” operation. After initial setup the system can run from a full to an empty spool without any change in tension or operator input. The system can detect partially full spools and adjust to accommodate itself automatically. Tension can also be changed on the fly, without stopping material payoff. Simply use the keypad to select the new tension value and you are done. The PowerPro will adjust to that new...

 Open the catalog to page 8

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