QHMAG 2018 electro permanent telescopic beam magnetic lifting clamps

	Electro Permanent Magnet	Electromagnet	Permanent Magnet
Principle	Combining permanent magnets and electromagnetic coils, switching magnetic circuits (magnetizing/demagnetizing) through short-term current	The current passes through the coil to generate a magnetic field, which disappears when the power is off	Natural or artificially magnetized materials (such as NdFeB magnet) can maintain a magnetic field without the need for external energy
Energy Consumption	Extremely low (only consumes power when switching MAG/DEMAG states, maintains magnetic force without consuming energy)	Continuous power consumption (requires constant current to maintain magnetic field)	Zero energy consumption (no power supply required)
Magnetism Controllability	Switchable (changes condition instantly upon power on: suction/release)	Flexible adjustment (real-time and precise control of magnetic strength through current magnitude)	Uncontrollable (fixed magnetisn, unable to actively close or adjust)
Power Outage Performance	Safe and reliable (maintain the suction or release state after power failure, depending on the switching mode)	Magnetic force disappears (power outage causes loss of magnetism, which may lead to workpiece detachment)	Constant maintenance (always present magnetic field)
Response Speed	Faster (millisecond level switching state)	Extremely fast (millisecond level real-time response to current changes)	No response (status is immutable)
Volume and Weight	Medium (requires integration of permanent magnets and coils)	Larger/heavier (requires large coils and iron cores to achieve strong magnetic fields)	Compact and lightweight (high magnetic energy product material can achieve strong magnetic field)
Maintenance	Low (no mechanical wear, long lifespan)	High (the coil may be overheated and damaged, requiring heat dissipation design)	Extremely low (high physical stability)
Safety	High (anti power failure, no sustained heating)	Under risk (out of control power outage, coil overheating)	Medium (Strong magnetic field may cause injury and cannot be actively released)
Continuous Work for 8 Hours	Zero energy consumption+One click release	Power consumption>200kW / h, coil overheating	Zero energy consumption but requires manual wrench release
Application	Machine tool fixtures, robot grippers, Steel lifting, (requiring power-off safety and energy-saving scenarios)	Magnetic relay,  (requiring real-time control of magnetic scenes)	Motor, sensor, speaker, magnetic buckle (static fixed scenario)

 

Overall the advantage of Electro Permanent Magnet
1. Ultimate energy saving：
▶  Power consumption during switching only: momentary power on during suction/release (approximately 0.1~1 second), zero energy consumption throughout the entire transportation process.
▶  Energy saving of over 90% compared to electromagnets (electromagnets require continuous power supply to maintain magnetic force).

2. Absolutely safe while power outage:
▶  Permanent magnet retention: The magnetic force does not disappear after a power outage, avoiding sudden power outages or cable breakage that may cause steel plates to fall.
▶  Compliant with ISO 13849 safety level PL e (highest level) to prevent safety accidents.

3. Efficient handling:
▶  Single sided adsorption: without penetrating the steel plate, directly adsorb the surface on one side (minimum thickness ≥ 1mm).
▶  Instantaneous switching: Complete suction/discharge actions within 1 second, reducing the work cycle by more than 30%.

4. Strong adaptability:
▶  Disregarding surface condition: Can absorb steel plates with attached oil stains, rust, or unevenness (strong magnetic penetration).
▶  High temperature resistance: The specially designed version can withstand an environment of 200 ℃ (the electromagnet is prone to demagnetization when it exceeds 60 ℃).

5. Ultra low maintenance costs:
▶  No moving parts: No mechanical wear, lifespan>10 years.
▶  No cooling system: no continuous current, no heating (electromagnetic coil requires forced heat dissipation).

6. High loading ratio:
▶  Light weight and strong suction: The magnetic self weight ratio can reach 1:15 (1 ton of lifting equipment can attach 15 tons of steel plates), saving the crane load margin.

 

QA
1、Q: How does the electro permanent magnet lifter work?
      A: Its core consists of special permanent magnet materials and electromagnetic coils inside. 
MAG process: Short positive current is applied, and the magnetic field generated by the coil is superimposed with the magnetic field of the permanent magnet, allowing the magnetic force to penetrate the bottom surface of the lifting device and strongly adsorb the workpiece. 
DEMAG process: Short reverse current is applied, and the magnetic field of the coil cancels out the magnetic field of the permanent magnet, making the net magnetic force on the bottom of the lifting device close to zero, and the workpiece can be easily removed. Afterwards, the magnetic state is locked by the internal permanent magnet and no further power supply is required.

 

2、Q: How to choose a suitable tonnage (lifting capacity) electro permanent magnet lifter?
      A:The selection of tonnage requires consideration of the most stringent working conditions:
Workpiece size& weight: Max. and Min. size range is required.
Safety factor: The industry usually requires a safety factor of ≥ 2 times. QHMAG standard: 3 times more for the safty factor!For example, when lifting 1t of workpiece, a lifting device with a rated lifting force of ≥ 3t needs to be selected. Important! The safety factor is a mandatory hard indicator that must be followed.
Workpiece material and thickness: The magnetic penetration ability is limited. The workpiece must be made of magnetic materials (such as steel and iron) and have sufficient thickness. Please refer to the magnetic penetration curve provided by our company or consult the sales engineer for confirmation to avoid insufficient adsorption force. Example: The design of lifting equipment required for lifting thick steel plates and thin iron sheets is different.
Workpiece shape and contact area: Small contact area (such as small round steel, narrow strip steel) and complex shape (curved surface, with holes) can affect the effective adsorption area, and targeted design or larger tonnage lifting equipment should be selected.
Operating environment: Models with corresponding protection levels should be selected for high temperature, humidity, and dusty environments.

 

3、Q: What is the basic process of operating an electro permanent magnet lifting device?
      A: (This is a general process, please refer to the instruction manual for details)
Preparation: The operator confirms that the workpiece meets the requirements (magnetic conductivity, sufficient thickness, and no obvious separators on the surface such as thick oil layers or wooden blocks). The crane operator smoothly moves the lifting device directly above the workpiece.
Magnetization (loading): The operator presses the "Magnetization" button (or remote control command). The lifting device is instantly powered on to complete magnetization (indicator light on/buzzer ringing). Take a brief pause (such as 1-2 seconds) to confirm that the magnetic force is firmly established (slight lifting can be attempted).
Lifting and transportation: The crane operator lifts and transports the workpiece steadily and uniformly to the target position. It is strictly prohibited to lift or lower quickly, stop or move quickly, shake violently or collide with obstacles!
Demagnetization (unloading): Place the workpiece steadily in the target position (ensuring that there are no debris or personnel below). The operator presses the 'demagnetization' button. The lifting device is instantly powered in reverse to complete demagnetization (the indicator light goes out/the buzzer stops). After confirming that the magnetic force has disappeared (the lifting device can be easily removed), the crane removes the lifting device.
Loop: Repeat the above steps.

 

4、Q: If there is a sudden power outage, will the adsorbed workpiece fall off?
      A: No way! This is precisely the core safety advantage of electro permanent magnets. Once the magnetization is completed, the magnetic state is permanently maintained by the internal permanent magnet without the need for any external power. Power outage will only affect the next charging and demagnetizing operation, and has no effect on the already adsorbed workpiece. After restoring power supply, demagnetization operation can be carried out normally.