Product Overview
Sjogren’s magnetic brakes for spooling and winding operations are key for any wire production facility. By helping control torque variations, tensioning brakes preserve drive train life in winding operations.
Utilizing magnetic resistance (hysteresis), Sjogren’s brakes operate without the need for an external power source and are designed with minimal mechanical wear components, aside from ball bearings.
The primary applications include: material unwind operations for payoff tasks; coil-wind operations ensuring constant tension with a nip roll; material handling for electric motor overload protection; and tightening operations for consistent cycling and tightening.
Key Benefits
Discover the key features of the Hysteresis Brakes from Sjogren with our interactive model or scroll down to explore more about the options available, including tensioning feedback brakes and eddy-current clutches!
1Mechanical Assembly
2Consistency
The magnet-based technology maintains permanent, consistent levels of resistance and experiences no friction wear. Custom designs available as well as our standard lines, including eddy-current clutches.
3Repeatability
Repeatable and recordable settings make it easy for the operator to control torque precisely with an integrated scale. This also allows your operators to reliably vary settings from one application to another.
4Feed-back Tensioning Brake Options Available
Ensure optimal material tension during pay-off to minimize waste and extend the lifespan of your equipment. Sjogren’s Hysteresis Tensioning Feed-Back Brakes automatically adjust torque as the pay-off spool diameter decreases, enhancing both quality and efficiency. Sjogren proudly offers the market's largest permanent magnetic brake.
5Constant Tension - No External Power Needed
The Sjogren hysteresis brakes are used to provide controlled tension or torque during spooling, unwinding, tightening or other similar machine operations.
The rugged brakes provide constant torque regardless of the rotation speed. They ensure smooth startup and uniform movements even as the diameters change. The brakes operate according to the principle of permanent magnetic dual disks hysteresis.
Units can be used for powertrain overload protection. This magnet technology does not require an external power supply and is virtually maintenance and wear-free.
Industries & Applications
The Hysteresis Brakes and Clutch line from Sjogren is trusted by many industries that require consistency and reliable repeatability:
Energy Sector
For manufacturing reserve and motive power batteries, power equipment, and charging systems
Industrial & Construction Manufacturing
Wire Processing & Wire Production
Automotive
Aerospace
Sjogren's Hysteresis Brake & Feedback Brake Models and Specifications
View Tech Specs and Model Options Sjogren Magnetic Brakes
For Checking Size of Die After Grinding
| Model | Torque Range | Max. RPM at Min. Torque |
Max. RPM at Max. Torque |
Max. Moment on Shaft |
|---|---|---|---|---|
| SMB-0.75 | .13lbs. - .75 in-lbs. | 3,000 rev/min | 1,350 rev/min | 2 in - lbs. |
| SMB-1.25 M SMFB-1.25 M |
0.6lbs. - 1.25 in-lbs. 0.6lbs. - 1.25 in-lbs. |
2,000 rev/min 1,500 rev/min |
800 rev/min 750 rev/min |
40 in - lbs. 30 in - lbs. |
| SMB-12 M SMFB-12 M SMB-12 HDM SMB-12 HDSM |
1lbs. - 12 in-lbs. 1lbs. - 12 in-lbs. 1lbs. - 12 in-lbs. 2lbs. - 12 in-lbs. |
1,000 rev/min 1,000 rev/min 1,000 rev/min 1,000 rev/min |
175 rev/min 175 rev/min 175 rev/min 175 rev/min |
80 in - lbs. 30 in - lbs. 300 in - lbs. 600 in - lbs. |
| SMB-25 M SMFB-25 M |
2lbs. - 22 in-lbs. 2lbs. - 22 in-lbs. |
1,000 rev/min 1,000 rev/min |
250 rev/min 250 rev/min |
200 in - lbs. 200 in - lbs. |
| SMB-60 M SMFB-60 M |
5lbs. - 60 in-lbs. 5lbs. - 60 in-lbs. |
1,000 rev/min 1,000 rev/min |
200 rev/min 200 rev/min |
1,000 in - lbs. 500 in - lbs. |
| SMB-120 M | 10lbs. - 120 in-lbs. | 1,000 rev/min | 200 rev/min | 1,000 in - lbs. |
SMB= models without feedback control; SMFB= models with feedback control
Further specifications and measurements available upon request
See some of our satisfied customers
Sjogren's Hysteresis Brake FAQ
What brake sizes are best for material unwind operations?
Material Unwind Operations
Sizing Specifications
Full roll diameter (in.) (FD) = 6 in.
Core diameter (in.) (CD) = 4 in.
Average Tension (lbs.) (T) = 4 lbs.
Velocity (feet per min.) (V) = 100 fpm
Sizing Formula
Average radius (in.) = (FD+CD) / 4 = (6+4) / 4 = 2.5 in.
Torque (in. lb.) = (T) x Avg. Rad. = 4 x 2.5 = 10 in. lb.
Check Tension Range
Maximum Tension = Torque x 2 / CD (10×2 / 4) = 5 lbs.
Minimum Tension = Torque x 2 / FD (10×2 / 6) = 3.3 lbs.
Slip Watts = Max. Tens. x V / 44.2 (5×100 / 44.2) = 11.3 watts
Specify: Model SMB-12
Which brake sizes are best for material handling operations?
Material Handling Operations
Motor Horsepower Method
Motor HP = 1/2 HP
Motor RPM = 1750 RPM
Sizing Formula
Torque (in. lb.) = HP x 63000 / RPM
1/2 x 63000 / 1750 = 18 in. lb.
Specify: Model SMB-60
Which brake size is best for tightening operations?
Tightening Operations
Sizing Specifications
Slip RPM = 500 RPM
Torque = 8 in. lbs.
% Slip Time of total cycle time = 25%
Sizing Formula
Watts = .0118 x Torque (in. lb.) x Slip RPM x % Slip Time
.0118 x 8 x 500 x .25 = 11.8 watts
Specify: Model SMB-60
Which brake size is best for coil wind operations?
Sizing Specifications
Pulley/Nip Roll dia. (in.) (D) = 6 in.
Tension (T) = 6 lbs.
Velocity (V) = 100 fpm
Sizing Formula
Torque (in. lb.) = TxD / 2 = (6×4) / 2 = 12 in. lb.
Slip Watts = TxV / 44.2 = (6×100) / 44.2 = 13.6 watts
Specify: Model SMB-12
If diameter is not predetermined, calculate slip watts and select a unit with a sufficient dissipation rating. Determine maximum diameter of pulley or nip roll using the following equation: Max. dia. (in.)=(12 in.lb.x2) / 6 lbs. = 4 in.
How much do Sjogren's magnetic brake offerings cost?
Sjogren stands out in the market with unparalleled quality. Our pricing is tailored to your specific production requirements.
The costs vary greatly depending on your specific needs and material costs at the time of purchase. We do offer volume pricing for almost any of our products. It is recommended to consider purchasing in quantity to realize this opportunity.
On average at the time of this question response, pricing ranges from the mid hundreds to under $5k depending on your specific model.
All Sjogren products are supplied with the Sjogren guarantee of quality and lifetime support for replacement parts, troubleshooting and re-ordering.
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