Hysteresis and Matched Hysteresis Brakes HB / MHB Series
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Hysteresis and Matched Hysteresis Brakes HB / MHB Series - 1

HB/MHB Data Sheet HB Hysteresis Brakes and MHB Matched Brakes Features • • • • • • • • • • Torque up to 3500 oz·in/26 N·m Speed up to 20,000 rpm Power up to 2400 W Available in Metric or English dimensions Torque independent of speed Long, maintenance-free life Operational smoothness Superior torque repeatability Broad speed range Excellent environmental stability DESCRIPTION Magtrol pioneered the technology of applying the principles of hysteresis to meet the critical needs for reliable, smooth and adjustable torque control. Magtrol’s Hysteresis Brakes produce torque strictly through a magnetic air gap without the use of magnetic particles or friction components. This method of braking provides far superior operating characteristics (smoother torque, longer life, superior repeatability, high degree of controllability, and less maintenance and down time) which make them the preferred choice for precise tension control during the processing of nearly any material, web or strand. Matched Brakes In tension control applications that have multiple webs or multiple strands, it is very desirable to match the tension of each web or strand. This is most commonly attained by using a closedloop servo control system which controls current to a braking device through the use of dancer arms, follower arms and inline tension transducers. The problem with such systems is that each web or strand must be individually controlled, increasing the cost and complicating the system with multiple sensors and power supplies. Regular Brakes Brake Power Supply Power Supply Power Supply Matched Brakes Brake Power Supply point—to other brakes of the same model designation. Regardless of material and manufacturing tolerances, each brake is matched at the selected match point to within a tolerance of ±1%. The maximum deviation in torque from brake to brake at any point along their torque/current curve (from 0 torque up to the selected matched torque point) is less than ±4%* of the selected matched torque value. With this level of matching, a system with multiple tension rollers would provide tension consistency within ±1% if set at the matched point with all brakes receiving the same current. The matched point can be any value between 50% and 100% of rated torque, which allows the brakes to be optimized for specific applications. Unless otherwise specified, all brakes are matched at 100 rpm. To s o l v e t h i s problem, Magtrol developed a system to assure that every brake of a given model designation will be matched— at a predetermined torque and current Precise control of wire tension during wind, hook and cut operation of high-speed automated winding machines Frictionless, non-breakaway force for tensioning materials during slitting and many other material processing operations Load simulation applications for life testing on electric motors, actuators, small gas engines, gearboxes, and many other rotating devices and assemblies Open-loop control for maintaining precise tension during winding process in transformer and coil winding operations Holding of backdriving loads Ultimate tension control, regardless of control scheme– dancer roll, follower arm, photo or ultrasonic sensors Precise load control and programmed repeatability in fitness machines *Contact Magtrol for more information

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Hysteresis and Matched Hysteresis Brakes HB / MHB Series - 2

Hysteresis Principles Principles of Hysteresis Overview The hysteresis effect in magnetism is applied to torque control by the use of two basic components –a reticulated pole structure and a specialty steel rotor/shaft assembly–fastened together but not in physical contact. Until the field coil is energized, the drag cup can spin freely on the ball bearings. When a magnetizing force from either a field coil or magnet is applied to the pole structure, the air gap becomes a flux field. The rotor is magnetically restrained, providing a ROTOR braking action between (Drag Cup) the pole structure...

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Hysteresis and Matched Hysteresis Brakes HB / MHB Series - 3

Specifications English Ratings Hysteresis Brake Model Matched Brake Model HB/MHB (for METRIC rating see page 5) Kinetic Power** Min. Torque at Rated Current Rated Current Maximum Speed Matched Brake Model Drag Torque De-energized @ 1000 rpm Nominal Power External Inertia Angular Acceleration Hysteresis Brake Model * Other coil voltages are available. ** Kinetic power ratings are maximum values based on limiting coil and/or bearing temperature to approximately 100 ºC, and should not be exceeded. Actual values in service may vary ±50% depending on mounting, ventilation, ambient temperature,...

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Hysteresis and Matched Hysteresis Brakes HB / MHB Series - 4

English Brake Dimensions E D K (3) Mounting Holes - equally spaced Hysteresis Brake Model --- Matched Brake Model MHB-2.5 0.625 0.060 #807 woodruff keyway (2 places) #807 woodruff keyway (2 places) * HB-840 and HB-3500 are double brake assemblies that require base mounting. See base mounting under “Brake Options” for details. Magtrol manufactures double brakes to increase torque capability. For more information and a drawing, contact Magtrol.

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Hysteresis and Matched Hysteresis Brakes HB / MHB Series - 5

Metric Ratings Hysteresis Brake Model Matched Brake Model Kinetic Power** Min. Torque at Rated Current Rated Current Maximum Speed Matched Brake Model MHB-3M-2 Drag Torque De-energized @ 1000 rpm Nominal Power Hysteresis Brake Model External Inertia Angular Acceleration N m is attainable @ approx. 600 mA. This value may decrease to 12.36 N·m if the brake is powered by any power supply or controller limited to 500 mA. §§ 26 N m is attainable @ approx. 1200 mA. This value may decrease to 24.72 N·m if the brake is powered by any power supply or controller limited to 1000 mA. * 90 volt and...

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Hysteresis and Matched Hysteresis Brakes HB / MHB Series - 6

metric Brake Dimensions E D K (3) Mounting Holes equally spaced G Hysteresis Brake Model HB-3M-2 Matched Brake Model MHB-3M-2 4x4x20 round end 45.0 keyway (2 places) 5x5x20 round end 60.0 keyway (2 places) 5x5x20 round end 70.0 keyway (2 places) 8x7x25 round end keyway (2 places) 8x7x25 round end keyway (2 places) * The HB-3500M-2 is a double brake assembly that requires base mounting. See base mounting under “Brake Options” for details. Magtrol manufactures double brakes to increase torque capability. For more information and a drawing, contact Magtrol.

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