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Hysteresis Brake Dynamometers (HD series) are versatile and ideal for testing in the low to middle power range (max. 14 kW intermittent duty). Hysteresis Brakes do not require speed to create torque, and therefore can provide a full motor ramp from free-run to locked rotor. Brake cooling is provided by convection (no external source) or by air (compressed air or dedicated blower) depending on the model. Hysteresis Dynamometers have both continuous and intermittent power ratings where the dynamometer is capable of dissipating more power for shorter periods of time. All Hysteresis Dynamometers have accuracy ratings of ±0.25% to ±0.5% full scale, depending on size and system configuration. Also available are special designs for high-speed motor testing.
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The most popular range of MEROBEL's EMP Brakes, offering tailored solutions for every needs from its 10 sizes and up to 5 different version (acceptable power dissipation level) for each size.
Especially designed to be easily fitted on equipments such as Converting, Printing, Wire & cable, and Packaging machines.
Cost effective solution for variable torque simulation systems (automotive and aeronautics test rigs).
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Ogura is the largest manufacturer of electromagnetic clutches and brakes in the world. Current manufacturing capacity is in excess of 30 million clutches and brakes per year. We have 14 manufacturing plants throughout Europe, the Americas, and Asia. All plants are certified ISO9001 and most have been certified ISO 14001 and TS16949. We have over 3,000 designs available. Besides the standard product shown we also make a variety of specialty products. Our products are used in automotive, industrial, mobile, factory automation, office automation, agricultural and construction machinery industries. Our brakes are made in the following styles: electromagnetic single face, multiple disk, hysteresis, eddy current, magnetic particle and permanent magnet. Torque range for standard products is from .0001nm to 1,000nm.
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Magnetic particle brakes and clutches are of simple design. Due to their size they produce a high torque compared to for instance hysteresis brakes. They are having two rotors (inner and outer) and an air gap between these two rotors where the magnetic particles are dispersed in. An electric current passing through the coil creates a magnetic field, which aligns the magnetic powder into the gap. The higher the current, the more rigid the connection between the inner and outer rotor becomes. The principle is the same for brake, clutch and torque limitor.
Advantages:
Noisless work
Torque directly proportional to current
Torque independant from r.p.m. (starting from 30 min)
Strong design, units are able to be used with steady slipping
High torque range to be controlled (approx 1:50)
Applications:
Braking
Torque control, torque limiting
Tension control at winding, unwinding
Starting clutch operation
Calculated braking and starting
of certain masses and inertias
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The most popular range of MEROBEL's EMP Brakes, offering tailored solutions for every needs from its 10 sizes and up to 5 different version (acceptable power dissipation level) for each size.
- EMP technology (ElectroMagnetic Particle)
- Torque proportional to the electric current, independent of the slipping speed
- The best design for Tension Control and Test benches applications
- 5 different versions (power dissipation) available
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Pure 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.
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Magnetic Technologies Ltd. offers a complete line of hysteresis brakes for tensioning and torque limiting.
• Torque range from 0.1 inch ounce to 140+ inch pounds.
• Hysteresis brakes have no break-away torque, no wearing parts, and use no electricity.
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ZF Hysteresis brakes can accommodate power ratings from 0.05 to 040 Nm, with integrated planet gaer box up to 270 Nm.
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Advantages
The superior design of these hysteresis devices provide several inherent advantages over magnetic-particle and friction devices. They operate on a frictionless design principle with virtually nor 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.
Control
In an electrically operated hysteresis brake or clutch, adjustment and control of torque is provided by a field coil. This allows for complete control of torque by adjusting DC current to the field coil. Adjustability from a minimum value (bearing drag) to a maximum value of 15 - 35% above rated torque is possible. In a permanent magnet device, the field coil is replaced by a magnet which provides the precise field strength necessary to produce rated torque without the need of electrical excitation. Since the field strength produced by a permanent magnet is a constant value, the resulting torque will also be constant. Physical realignment of the pole structure will result in limited (but predictable) changes in torque. Special designs utilizing this method are available and will allow for adjustments down to approximately 30 - 40% of rated torque.
Longer expected life
Hysteresis brakes and clutches produce torque strictly through a magnetic air gap, making them distinctly different from mechanical-friction and magnetic particle devices. Because hysteresis devices do not depend on friction or shear forces to produce torque, they do not suffer the problems of wear, particle aging and seal leakage. As a result, hysteresis devices typically have life expectancies many times that of friction and magnetic particle devices.
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Permanent Magnet Brakes - High Torque
Permanent magnet brakes of the range “High Torque” are mainly used as holding brakes and generate their braking action through a permanent magnetic field. The following functions are fulfilled here: Holding, positioning and emergency stop. The basic characteristics such as high power density, residual free releasing in any installations and backlash free transmission of the braking torque makes them perfectly suitable for the applications in servo motors.
Versions
86 611..P00
(Holding brake)
Standard rated voltages
24 V
Protection
IP 00
Thermal class
F
Torque
0,8 Nm – 300 Nm
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Particle, hysteresis Electromagnetic brakes
