General description of electromagnetic clutches

These are flange mounted, normally a two piece construction clutch typically mounted directly on to the pump.

Solid forged rotor.
A one piece solid forged rotor means no chance of internal parts separation. The rotors also have an even wall thickness around the coil which gives optimum flux distribution, maximizing torque.

Different coil voltages available.
Although 12 volt is the most common, 24 volts can also be made available. Depending upon the quantity, other specialty voltages can be made.
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High temperature, longer life grease.
All models include our special long life grease which has shown a significant improvement in life over other standard high temperature greases.

E-coating.
Where possible, all parts in the clutch are e-coated to give maximum corrosion protection.

High temperature epoxy coil.
To help prevent failure from both vibration and outside contaminants, all coils are sealed in the coil shell with a high temperature epoxy coating.

Forged machined pulley.
All models in this section use a heavy duty machined pulley. A stronger pulley resists damage due to abusive environments.

MMC electromagnetic clutch series for marine & hydraulic pump applications

MMC series electromagnetic clutches are designed for use with hydraulic pumps, many of which are used in marine winch drives. Typically flange or plate mounted, they engage and disengage the pump.
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» Torque ratings from 271 to 2033 Nm (200 to 1500 lb-ft) .
» Solid forged rotor & pulley or hub.
» Direct drive or pulley drive.
» 12 & 24 VDC available.
» "TC" and "B" type pump mounts.
» Straight or splined bore.
» High temp, long life grease.
» Bi-directional operation.
» One piece design.
» Plated for corrosion protection.
» High temperature epoxy coil.

Application example of "limp home" feature of the MMC series clutches

A helpful feature of the MMC Series electromagnetic clutches designed for use in extreme conditions like those seen on lobster / shrimp / fishing boats is the "limp home feature".

The clutch is used to engage and disengage the hydraulic pumps that lower or raise the nets or traps when hauling in the catch. While the clutch is a highly reliable component when applied properly, there are still times when things can go wrong, or the clutch just simply wears out. If the clutch will not engage or cannot drive the load, the MMC electromagnetic clutch features a “limp home” feature that allows the clutch to drive the pump without power. Two threaded holes in both the armature and rotor allow the operator to insert a bolt that draws and locks the two plates together. This provides a mechanical lockup to operate the equipment and continue fishing with a minimal loss of time and money.

All MMC clutches feature the limp home design and range in torque from 271 to 2033 Nm.

A variety of bore sizes and pulley options are available.
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Most larger clutches operate via an inline drive and the clutch hub is fitted with a bolt pattern that matches common driveshaft couplings.

For technical data see page 8 of technical specification catalogue

Soft start clutch control

The patented Softstart Clutch Controller offers a simple solution to all of these issues!
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» Mechanical Life: The Softstart lessens forces to mechanical parts and improves the life of bolts, decks, brackets and other mechanical parts.
» Belt Life: Reduce wear and breakage for belts and improve the quality & reliability of the equipment.
» Engine Stall: The Softstart eliminates engine stalling and RPM droop by utilizing closed loop RPM monitoring while engaging the electric clutch.
» Mechanical Jolt: Smooth engagement means less jolt to the equipment and customers.
» Engine Cost Savings: The Softstart Clutch enables OEM's to reduce equipment engine size to save money.
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Full information regarding the Softstart controller found on pages 12 and 13 of the technical specification catalogue

Video: How an electromagnetic clutch works.

Applications

Industrial electromagnetic clutches, electromagnetic brakes and clutch brakes are used in many types of high speed, high cycle rate and long life machines including printers, packaging machines, food processing equipment, industrial mixers, and cash counting machines.

Magnetic particle, hysteresis slip clutches and magnetic particle, hysteresis slip brakes are used in many tension control systems to regulate the wind and unwind of fabric or carbon fiber or other materials during processing.

Also called particle clutch or particle brakes, they are used in new digital high resolution sign and photograph printers for professionals. Many designs are interchangeable with Warner Electric, DynCorp, KEB, Electroid, Lenze, Deltran, Intorq and Matrix.

Spring applied brakes, power off brakes, or spring set brakes (fail-safe brakes) are used in mobile, medical and robotic applications as well as used in radio telescopes. Also called servo motor brakes, they are also used to control electric wind generators, turbines and amusement rides from over speed conditions.

Industrial electric brakes are used in rail road crossing gates and parking lot/toll gates. These devices are also used in mailing machines, mail sorters and semiconductor processing applications.

Electric tooth clutches, electromagnetic tooth clutches and electric multiple disc clutches are used where high torque and small size are required. Customer applications include machine tool manufacturers, NC machines, lathes, milling machines and others. They are used by manufacturers of AC and DC electric motors including brake motors, brushless DC motors and servo motors.
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Applications for these high reliability brakes include overhead doors, cranes, marine, construction equipment and brakes for super quiet use in stage and theatre can be supplied. Manual release levers or emergency release mechanisms can be available on many of these products if needed.

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MIC Electromagnetic Clutch

Torque Range: 0.226 to 0.79 Nm / 2 to 7 in-lbs.

Small clutches for use in copy machines, printers, and other peripheral devices. This one-piece assembly features a custom-molded gear or timing pulley designed to your specifications. Most clutches use a permanent magnet to disengage the armature when it is not in use.All clutches are bi-directional.
See page 17 for further details of this model.

AMC Electromagnetic Clutch

Torque Range: 2.7 to 7.9 Nm / 20 to 70 in-lbs.

Clutch designed for general industrial use. Clutches are designed with zero backlash armatures and a double ball bearing field support to provide longer life and better performance versus bushing style units. AMC-E version now available - Newer E version is lower in cost, lighter in weight, is RoHS compliant and has a reduced wattage so energy consumption is lower, but still has equivalent performance to the AMC clutches.
See page 18 for further details of this model.

VC Electromagnetic Clutch

Torque Range: 5.4 to 59.7 Nm / 4 to 44 ft-lbs.

Clutch designed for general industrial applications. Units come standard with zero backlash armature. Units are normally produced in a high torque version but a lower torque is also available which reduces the overall length of the clutch by 15%. Options for this unit include an automatic air gap that adjusts as the clutch wears, a quiet armature option that reduces clutch engagement noise for application in hospitals or offices and a 1 piece designed option that simplifies mounting.
See page 20 for further details of this model.

TMC Electromagnetic Clutch

Torque Range: 5.4 to 199.3 Nm / 4 to 147 ft-lbs.

Clutch designed for general industrial use. Compact design with a thin overall profile. Zero backlash armatures can be built into custom hubs. Clutches are available with bearing supported field or a (no bearing) flange field.
See page 24 for further details of this model.

MSC-T Electromagnetic Clutch

Torque Range: 12.2 to 1000.6 Nm / 9 to 738 ft-lbs.

Clutch designed for general industrial use. Suitable for high speed and high cycle applications. Clutch has automatic wear adjustment mechanism which maintains proper air gap over life of the clutch to maintain a consistent engagement time.
See page 25 for further details of this model.

MMC Electromagnetic Clutch

Torque Range: 50.2 to 1999.8 Nm / 37 to 1475 ft-lbs.

Heavy duty clutches best suited for marine and mobile applications. Bi-directional spring resists engine vibration and shock. Output can be modified to meet your requirement, or clutch can be purchased with armature only to bolt into your hub.
See page 26 for further details of this model.

MZ Electromagnetic Clutch

Torque Range: 24.4 to 3999.7 Nm / 18 to 2950 ft-lbs.

Clutch is designed for high torque small space environments where no slip is desired. Clutch can be used dry or in an oil bath. A zero backlash option is available. Zero drag torque when clutch is disengaged.
See page 31 for further details of this model.

MZS Electromagnetic Clutch

Torque Range: 24.4 to 249.5 Nm / 18 to 184 ft-lbs.

Clutch is designed for high torque small space environments where no slip and only a single engagement position is desired. Clutch can be used dry or in an oil bath. A zero backlash option is available. Zero drag torque when clutch is disengaged.
See page 32 for further details of this model.

PHT Permanent-Magnet Hysteresis Clutch/Brake

Torque Range: 0 to 7 Nm / 0 to 62 in-lbs.

Permanent magnet hysteresis units can be configured as a clutch or a brake depending upon mounting. Torque is accurate and dependable because it is produced magnetically, not via friction. Torque is consistent over a given speed range. Because there is no wear, units have an extremely long life. Also since units are sealed, there is no concern about contamination. Each unit has an adjustable torque range that can be set by the user and since the units operate via permanent magnets, no external controls or power is required.
See page 41 for further details of this model.

HC Electromagnetic Hysteresis Clutch

Torque Range: 0.05 to 1 Nm / 0.4 to 8.9 in-lbs.

Hysteresis clutch for industrial application. Torque is independent of slip speed and can be easily controlled by varying the current. Since there is no frictional contact between the magnets, the units have an extremely wide torque range and are ideally suited for testing machinery and/or application that are required to produce consistent and smooth torque over a wide range.
See page 43 for further details of this model.

MDC Electromagnetic Multiple-Disk Clutch

Torque Range: 17.6 to 8400 Nm / 13 to 6196 ft-lbs.

Multiple disk clutches designed for high torque small space environment. Multiple disks produce high torque in a compact design. Separate drive cup allows for easy connection to your gear or pulley.
See page 44 for further details of this model.

MWC Electromagnetic Multiple-Disk Clutch

Torque Range: 24.4 to 12000 Nm / 18 to 8851 ft-lbs.

Multiple disk clutches designed for high torque small environment. Clutches are designed to work in oil Multiple disks produce high torque in a compact design. Separate drive cup allows for easy connection to your gear or pulley. Special oil path grooves in the friction plastes allow for quick engagement and response time. Because clutches are used in oil lubrication they have excellent heat dissipation.
See page 46 for further details of this model.

OPL Permanent-Magnet Mag-Particle Slip Clutch

Torque Range: 0.03 to 0.4 Nm / 0.27 to 3.5 in-lbs.

Low cost slip clutch design for momentary and/or continuous slipping. Torque is produced magnetically eliminating the possibility of high break away torque that occurs within typical friction devices. Torque is consistent over a given speed range. Units are sealed so that internal particles cannot contaminate machine likewise external particles cannot contaminate the OPLs. Units are supplied with stainless steel shafts, which can be customized to meet your needs. (The OPR units are hollow bore mounted.)
See page 48 for further details of this model.

OPC-N Electromagnetic Mag-Particle Clutch

Torque Range: 0.5 to 8 Nm / 4.4 to 71 in-lbs.

Magnetic particle clutch designed for industrial applications requiring fast response time and a stable torque. Units can also be set for continuous slip which makes them ideal for tension applications. Since voltage to torque is linear, output torque can be easily controlled. Since torque is also transmitted via internal particles, unit life is extremely long.
See page 49 for further details of this model.

PC Electromagnetic Mag-Particle Clutch

Torque Range: 11.9 to 195 Nm / 8.8 to 144 in-lbs.

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quality products for mechanical & fluid power

quality products for mechanical & fluid power: www.jbj.co.uk

Electromagnetic Clutches

Designed to function and survive in harsh environments,
providing reliable performance in many long life applications.

Page contents:

Advantages of use:

Basic parts & magnetic flux path:

General description of electromagnetic clutches