Todays deals on Magnet Coil?

NEW EATON XTCE500M22TD MAGNETIC CONTACTOR 24-48VDC COIL 3P 500A DILM500/22 RDC48 $2,199.99

S-K600 Mitsubishi Magnetic Contactor 800A 3P 600V 220-240V Coil $1,650.00

NEW FITS ABB EH800 EH 800A MAGNETIC CONTACTOR AC COIL $1,628.99

NEW FITS ABB EH 550 EH550 MAGNETIC CONTACTOR AC COIL $1,499.99

GE CR306F002LBA SZ 4 MAGNETIC STARTER 115-120V COIL NEW $1,400.00

C400A-E Toshiba Magnetic Contactor 320A 3P 600V 300HP MAX 120V Coil – TESTED $1,250.00

NEW FITS ABB EH450 EH 450 MAGNETIC CONTACTOR AC COIL $999.99

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NEW FITS ABB EH370 EH 370 MAGNETIC CONTACTOR AC COIL $999.00

Cutler Hammer Magnetic Contactor C10CN3A Size 1 120V Coil W/ Interlock (5309) $840.00

NEW SPRECHER+SCHUH MAGNETIC STARTER CA6-140-11-*24V,120V,208V,240V,480V AC COIL $799.99

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NEW FITS ABB EH260 EH 260 MAGNETIC CONTACTOR AC COIL $699.99

Siemens KTRC550D8 Magnet Coil Kit $695.00

SIEMENS-ALLIS 14 182 887 503 10VDC magnet COIL MAGNETIC $637.00

NEW SURPLUS OEM ABB EH175C-1 EH175 EH-175120V AC coil MAGNETIC CONTACTOR $599.99

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SIEMENS MAGNETIC CONTACTOR 3TC4817-0A 600V DC 230V COIL $599.99

FPE MCC BUCKET SIZE 3 MAGNETIC STARTER 4204AU33-06 220V COIL $499.99

FUGI ELECTRIC MAGNETIC CONTACTOR SC-8N/UD 2NC4Q0# 100/120V COIL $499.00

2 NIB GE MAGNETIC SENSOR COIL ASSY DJ317A7419P111 $490.00

Allen Bradley 100S-D95EZJ22C 24VDC Coil Magnetic Relay New In Box $449.99

JOSLYN CLARK Magnetic Starter T13TA32-76 120V Coil $435.75

COMBINED SHIPPING 100HP WYE DELTA MAGNETIC STARTER Replacement LC3D80B7 24V COIL $399.99

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GE CR305E0AAD NEMA SIZE 3 MAGNETIC CONTACTOR 3 POLE 115-120V 60 Hz. COIL -NEW $395.00

CUTLER-HAMMER 9-1010-2 MAGNET COIL 110VOLTS $350.00

C.H. 9-548-2 MAGNETIC COIL 110V 60CY $350.00

Allen Bradley 100-D95 1000VAC 160A 24VDC Coil 3 Pole Magnetic Contactor $349.99

SQUARE D MAGNET COIL SIZE 5 31096-320-50 new $349.99

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3TY7573-0CM7 SIEMENS replacement magnetic coil 240V $247.00

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3TY7563-0AC2 SIEMENS replacement magnetic coil 24V $227.00

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1891-1 CUTLER HAMMER Magnetic Coil 110V 120V 50Hz Citat $225.00

Seimens-Allis 3TY6 483-OAJ8 Magnetic Coil $225.00

NEMA Size 4 Toshiba Magnetic Contactor C220A-E 959S 220A 600v 3PH 120 ~ 240 coil $225.00

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GE 300-200 Line Size 4 Starter Magnet Coils 55-501463G $209.99

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Cutler Hammer Magnet Coil Size 3 & 4 Starter A-1 Unused $200.00

SQD Square D 31012-400-09, 120 Volt Magnetic Coil $200.00

SQD Square D 31012-400-29, 600 Volt Magnetic Coil $200.00

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GE S+S MAGNETIC MOTOR STARTER SIZE 2 52-63A 120V COIL $199.00

GE S+S MAGNETIC MOTOR STARTER SIZE 2 52-63A 48V COIL $199.00

GE S+S MAGNETIC MOTOR STARTER SIZE 2 58-64A 24V COIL $199.00

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Siemens WS2-230 3 Phase 15 HP Magnetic Starter NEMA 1 Enclosure 208-240V Coil $197.99

3TY7543-0AC2 SIEMENS replacement magnetic coil 24V $197.47

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3TY7543-0AK1 SIEMENS replacement magnetic coil 120V $197.47

CUTLER HAMMER MAGNETIC COIL # 5250C79G12 , SIZE 3 & 4 , 240 VOLT $195.00

Siemens 3RT1045-1A 110/120VAC Coil Magnetic Contactor $179.99

Cutler-Hammer AN16DN0BB 3 Pole Magnetic Starter Size 1 Coil 220/240V 27 Amp NEW! $179.99

GE 55-501463G002 Series A Encapsulated Magnetic Coil $179.95

CUTLER HAMMER 9-1360-1 MAGNET COIL $178.22

31817 New-No Box, Yamato GB01807A0033 Magnetic Coil $177.74

SQUARE D MAGNETIC COIL # 31091-400-44 , NEW SURPLUS $175.00

New Toshiba C3-65U Magnetic Contactor Nema Size 2 Coil 115-120V 600VAC max $175.00

Square D Magnetic Coil Nema 6 d-57250-243-53 contactor $175.00

15HP 11KW Magnetic Contactor 3PH 50/60HZ 115V Coil $175.00

3TY7523-0AC2 SIEMENS replacement magnetic coil 24V $173.57

3TY7523-0AP6 SIEMENS replacement magnetic coil 240V $173.57

Magnet Coil Questions

a small bar magnet drops through coil. the magnet does not rotate during the fall. assume that both the?

a small bar magnet drops through coil. the magnet does not rotate during the fall. assume that both the starting point and the end point are very far away from the coil. what is the initial magnetic flux in the coil? what is the final magnetic flux through the coil? what is the net change of the magnetic flux in the coil? would the falling magnet induce any voltage in the coil?

flux will be NBA where, N is number of turns of the coil
B is magnetic field by the magnet
A is area of cross section of the coil
this will be same whether flux is initial or final.

emf ( potential ) induced in the coil will be ( according to Faraday’s Law of electromagnetic induction)
e = – N (d phi / dt)

I’m not sure about the initial or final flux but second part is correct.

Electro-Permanent Magnetic Lifters: Failsafe and Variable Holding Power

Electro-permanent magnetic lifters counter the limitations of permanent and electromagnets by combining the advantages of both.

The restricted lifting capacity of permanent magnetic lifters and the non-failsafe operation of electromagnetic lifters are two limitations of these types of lifters. To overcome these limitations, lifting magnet designers have created the electro-permanent magnetic lifter, which combines the advantages of both the permanent and electromagnetic lifters in one module.

Types of Magnets

There are three types of magnetic lifter technologies: permanent magnetic, electro-magnetic and electro-permanent magnets. The permanent lifting magnets use failsafe, permanent magnets, but they do not have a variable holding power capability, which restricts both their load capacities and the variety of applications they are best suited for.

Electro-magnetic lifters use a controller to generate a DC voltage in a coil embedded within the lifter module to generate the magnetic work holding force. The DC controller’s voltage can be adjusted to vary the magnetic flux field, which, in turn, varies the holding force of the electromagnetic lifter. This feature makes electromagnetic lifters flexible holding devices and very cost-effective as well. But electromagnetic lifters require continuous electrical power to operate. A power failure will de-energize the electromagnet, shut down the magnetic field, and create a potential safety hazard. Electro-permanent magnetic lifters counter these limitations.

Electro-permanent Lifter Operation

Electro-permanent magnetic lifters (commonly called electroperms) are a hybrid of the permanent and electromagnetic types. They are constructed with a coil wound around a magnetic material that is permanent, embedded in the lifter module. When a DC voltage is applied, the material is charged, which takes about 1 second, and attracts the material to the lifter even after power is removed. The lifter will hold the load until the electro-permanent magnet is turned off. This features gives electro-perms a failsafe operation.

Another function of the electroperm’s coil is to control the amount of magnetic force of the lifter. This feature gives it a variable holding power capability similar to electromagnetic lifters. This feature extends the types of applications the electroperm is suited for. Electroperms can be used in tandem for beam lifting operations as well as for light load, pick and place, robotic operations. For pick and place operations, the electroperm is modified to be lightweight for maximizing end-of-arm capacity. They are constructed with special coil configurations for fast switching with minimum dwell times and soft pole shoes contoured to provide the easiest access to the part.

Battery Operation

Electro-permanent magnetic lifters are sometimes called battery lifters because a battery instead of a D.C. controller is used to provide the power for the electroperm switching cycle. The battery gives the lifter portability. It also makes for a simpler system design because a complex D.C. controller is not necessary. However, the battery will require maintenance and periodic charging.

About the Author

DocMagnet Inc. designs and supplies Magnetic Material Handling equipment. DocMagnet offers a full line of Lifting Magnets including Electro-Permanent Lifting Magnets for most applications.

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