Holding electromagnet WL8245

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Overview
A permanent holding electromagnet integrates permanent magnets with a switchable coil to provide a high retention force without continuous power consumption. Energy is used only during switching, making the device suitable for safety-critical systems, heavy clamping, lifting and automation applications.

Main features

• High holding force with negligible or zero continuous power draw
• Hybrid design: permanent magnets plus electromagnetic coil for energy-efficient switching (energize-to-release)
• Failsafe holding during power loss
• Compact form factor for integration in machinery and automation systems
• Durable design with low maintenance needs

Product overview and principle of operation
The device combines a static magnetic field from permanent magnets with an electrically controlled coil. The permanent magnets provide the base holding force. A short electrical pulse to the coil modifies the magnetic flux (or neutralizes polarity) to release the load; after switching, the magnet returns to the holding state. Power is consumed only during the switching event.

Applications

• CNC workholding and magnetic clamping
• Robotics and automated pick-and-place for ferromagnetic parts
• Material handling: lifting, retaining and transporting metal sheets or assemblies
• Automotive assembly for positioning parts before welding or joining
• Security, failsafe locks and industrial brakes
• Automated Guided Vehicles (AGVs) and systems where low energy consumption and failsafe holding are required

Advantages and disadvantages

• Advantages: low energy consumption (only during switching), failsafe retention on power loss, compact size, high magnetic force, low maintenance and long potential service life
• Disadvantages: higher manufacturing complexity and cost versus simple electromagnets, more complex control circuitry, switching speed may be slower than simple solenoids in some designs, performance depends on temperature and target material, limited to ferromagnetic targets

Troubleshooting and operational notes

• Reduced holding force: verify contact surfaces are clean, flat and free of oil, dust or rust; eliminate air gaps
• Failure to release: check coil excitation signal, correct voltage and pulse timing; measure coil resistance for damage
• Overheating: avoid excessive switching; respect recommended duty cycle and provide cooling if frequent switching is required
• Mechanical misalignment: ensure correct alignment of mating surfaces to maintain flux path
• Residual force on release: small residual magnetization may remain; use demagnetization pulse or thin non-magnetic shims if necessary

Datasheet (excerpt)
WL-8425 Permanent Holding Electromagnet Products Data Sheet
Product name: Permanent Holding Electromagnet
Insulation Class: B
Model: WL-8425-24V
Hi-Pot test: AC750V/2S
Size: Ø82 x H45
Service Life: >500,000 cycles
Holding Force: 1900 N
Lead time: 3–5 days if in stock
Voltage: DC 12V / 24V
Power (switching): 43 W
Sample Order: Acceptable
MOQ: 200 PCS
Duty Cycle: 10%
Warranty: 2 Years
Lead Wire: bottom edge out 25 cm or customized
Origin: Dongguan, Guangdong, China
Action form: energize-to-release
Surface: electroplating (zinc coating)
Install thread size: M5 x H19
Material: steel & enameled wire
N.W.: 168 g
Certificate: CE / ROHS

Technical specifications

• Model designation: WL-8425-24V
• Holding force: 1900 N
• Operating voltages: DC 12V or 24V
• Power consumption (switching): 43 W
• Size (approx.): Ø82 x H45
• Duty cycle: 10%
• Service life: >500,000 cycles
• Insulation class: B
• Hi-Pot test: AC750V/2S
• Action form: energize-to-release
• Surface finish: electroplating (zinc coating)
• Install thread: M5 x H19
• Lead wire: bottom edge out 25 cm (customizable)
• Net weight: 168 g
• Origin: Dongguan, Guangdong, China
• Certifications: CE, ROHS