Electric actuator WL1240

linearrotarymetal alloy

Product overview
A latching solenoid actuator designed to remain latched in either the extended or retracted position without continuous electrical power. A permanent magnet provides the holding force so the actuator maintains its position with no energy consumption until a brief pulsed electrical impulse (opposite polarities for lock/unlock) changes the state. Common form factors include tubular, box-frame and rotary; force ranges from a few newtons up to >100 N. Suitable for battery-operated or IoT systems where energy efficiency and power-loss resilience are required.

Key features

• Zero holding power: permanent magnet holds position without power.
• Pulsed power operation: only short electrical pulses needed to change states.
• Bi-stability: two stable positions (extended and retracted) without continuous energy.
• Low heat output and energy-efficient compared with continuous solenoids.
• Medium holding force relative to size; suitable for smart locks, valve regulators and portable devices.

How it works
The actuator combines a permanent magnet and an electromagnetic coil. A short DC pulse (typically 20–100 ms) generates a field that either reinforces or opposes the permanent magnet's field; opposite polarity pulses switch between latched positions. Power is consumed only during brief switching pulses; otherwise the device draws no current while held.

Industrial applications
Used where power conservation and fail-safe holding are critical: smart door/cabinet/safe locks, EV charger plug locks, remote irrigation or solar-powered valve control, household appliance water control, portable medical gas flow controllers, automotive parking/locking devices, vending machines, lockers, counting machines, and solar positioning systems.

Advantages

• No standby power consumption when latched.
• Cool operation with minimal heat dissipation while holding.
• Fail-safe holding in case of power outage.
• Battery-friendly, suitable for portable and IoT devices.
• Simple drive circuits possible (capacitor discharge, H-bridge for bipolar drive).
• Compact designs with relatively strong holding force for size.

Disadvantages

• Bipolar drive required (reverse polarity pulse to release) unless using dual-winding designs.
• Lower dynamic (switching) force compared to continuously driven solenoids.
• Susceptible to demagnetization at high temperatures or strong external magnetic fields.
• Slower switching (typical 20–100 ms) and limited stroke (commonly up to ~15 mm).

Factors affecting operation

• Coil design & electrical parameters: voltage, current, resistance, wire size, number of turns (trade-off between magnetic strength and response speed).
• Pulse energy: correct voltage, pulse width, polarity and timing are critical (too short = no operation; too long = overheating).
• Magnet strength: stronger magnets increase holding force but may be harder to release.
• Mechanical load & friction: external load, return spring and internal friction affect stroke completion and holding reliability.
• Temperature & environment: high temperature raises coil resistance and can demagnetize magnets; moisture/dust increases friction and corrosion.
• Power supply stability: voltage fluctuations can cause unreliable switching, especially for battery-powered or long-wiring applications.
• Required response times: heavy plungers or poorly optimized coils slow response.
• Magnetic materials & manufacturing precision: core/plunger materials and air-gap tolerances strongly affect generated force.
• Control circuit design: correct drive type (H-bridge, pulse waveform), polarity inversion, timing and protection components are essential.

Troubleshooting (common symptoms & checks)

• Fails to latch/unlatch: check pulse amplitude/current, increase pulse width (e.g., ~100 ms), verify reverse-polarity capability, inspect magnets for thermal degradation.
• Weak holding (load pulls plunger): measure holding force, reduce temperature, check alignment and end-stop contact, consider higher holding-force model.
• Intermittent operation: inspect wire connections, H-bridge/contact oxidation, capacitor discharge circuit components and driver transistor thermal issues.
• Interference near other magnets: move device away from external magnetic sources or add magnetic shielding; increase pulse current if needed.
• No movement/no sound: check coil continuity and resistance (expected in typical range per design), inspect plunger for rust/corrosion, test with alternate power source.

Technical specifications

• Brand: Weilong Technology
• Model: WL1240
• Rated Voltage: DC 12 V or 24 V
• Rated Power: 10–20 W
• Work Model: Push-Pull Type
• Holding Force: 4000 gf
• Stroke: 10 mm (customizable)
• Reset Time: 0.2 s
• Service Life: 500,000 cycles
• Certifications: CE, RoHS, ISO9001
• Material: superior magnet iron
• Lead Wire Length: 200 mm
• Installation: screw
• Dimensional Tolerance: ±0.1 mm
• Water-proof: None
• Insulation Class: B
• Hi-Pot Test: AC 600 V 50/60 Hz 2 s
• Non-excitation Holding Force: 0
• Working Temperature: -10 °C to 100 °C
• Duty Cycle: 1–100 %
• Thread Depth: /
• Payment Term: TT or LC at sight
• Sample Order: Yes
• Warranty: 1 Year
• MOQ: 1000 pcs
• Supply Ability: 5000 pcs per week
• Delivery Time: 30 Days
• Port of Loading: Shenzhen