A military support vehicle can spend hours traversing rough terrain, then sit through a freezing night. Its onboard equipment still needs to respond when the operator powers it up. A sluggish solenoid can delay the cooling valve or leave an equipment latch unresponsive.
Custom solenoids give engineers greater control over the relationship between electrical input and mechanical movement. Rather than adjusting an entire assembly around a general-purpose part, designers can tailor the actuator to expected loads and operating conditions. A better fit can improve reliability without adding unnecessary complexity. Continue reading to discover ways custom solenoids improve military equipment reliability.
Withstand Harsh Conditions
Stand Up to Vibration
Ground vehicles travel over uneven terrain, and onboard equipment absorbs recurring vibration along the way. When repeated motion loosens an electrical connection or wears a moving component, the problem can appear as inconsistent actuation rather than an immediate failure.
A custom solenoid can use secure winding supports and mounting features that limit unwanted movement. Engineers can also account for how the armature moves under vibration, particularly when the equipment must hold its position without continuous power.
Testing the component in its installed orientation helps teams find problems that a bench test might miss. The goal is predictable movement after long periods of mechanical stress, not simply survival of a single shock.
Handle Temperature Swings
Cold conditions can increase the force required to move certain mechanisms, especially where lubrication or sealing resistance changes. High temperatures create different challenges, including rising coil resistance and reduced magnetic force for a given supply voltage. A catalog part may not cover the full combination of operating conditions.
Engineers can tailor the winding and magnetic circuit to the required force across the intended temperature range. They can also choose insulation systems and mechanical clearances that fit the environment.
A sound design review checks startup at the cold limit and sustained operation at the hot limit. Testing those conditions can reveal whether the solenoid still has sufficient force margin to complete its stroke.
Keep Contaminants Out
Dust and moisture are common sources of trouble for mobile equipment. Grit can interfere with moving surfaces, while water ingress can corrode conductive parts. A valve may remain energized even when contamination alters its operation.
Custom housings can improve the interface with the surrounding enclosure. Depending on the application, engineers may use sealing features or protective coatings to reduce exposure. They can also position electrical connections away from likely ingress paths.
In solenoid valve design, compatibility between the seal material and the working fluid deserves equal attention. A well-matched seal helps limit leakage while allowing the valve to move freely.
Strengthen System Performance
Make Power Use Predictable
Military field equipment doesn’t always operate from a perfectly steady supply. Voltage changes during startup or load transitions can alter the force available to a solenoid. Current draw also affects the power budget of a compact system.
A custom coil lets engineers match resistance and force requirements to the electrical supply. For certain applications, a peak-and-hold driver supplies stronger initial actuation current before reducing power to maintain position.
Magnetic latching offers another option when an actuator only needs power to change state. Designers must still consider how the mechanism behaves after a power interruption. Lower current isn’t beneficial if the device loses required holding force.
Deliver Consistent Motion
Reliability depends on more than whether a component moves once. Equipment may require the same stroke and response over repeated operating cycles. A mismatch between actuator force and load can produce delays that grow more noticeable under difficult conditions.
Custom design allows engineers to establish a force-versus-stroke profile around the mechanism. Spring selection and friction play significant roles in that relationship. A suitable drive strategy can also manage how quickly the armature moves.
For fluid-control applications, the valve’s pressure differential changes the force balance. Engineers should evaluate response time at the pressures the equipment will face, not just one convenient test point.
Fit Tight Assemblies
Space inside a military electronics enclosure or vehicle subsystem often comes at a premium. An oversized off-the-shelf actuator can push designers toward longer linkages or awkward mounting positions. Those compromises can introduce additional wear points.
A custom package can match available space while meeting the required force and travel. Designers might alter the mounting orientation or connector placement to simplify installation. They can also shape the housing to work with existing mechanical supports.
A better fit can reduce assembly complexity and make routing easier for nearby wiring. The key is protecting electromagnetic performance while adjusting the envelope, not shrinking the component at any cost.
Protect Electrical Interfaces
Solenoids interact with control electronics through their coils and drivers. Switching current through an inductive load can create voltage transients, especially when the controller turns the coil off. Without suitable protection, those transients can stress driver components.
Engineers can plan the electrical interface around the system’s switching behavior. Depending on response requirements, a driver may use a flyback diode or another suppression approach. Each option changes how quickly coil current decays.
Custom development also gives teams a chance to address connector strain and wire routing early. Those decisions can improve durability and reduce the likelihood of intermittent faults during service.
Plan for Long-Term Reliability
Support Longer Service Life
Some mechanisms cycle frequently, while others sit idle for long stretches. Both use patterns deserve attention. Frequent cycling wears moving surfaces, while long idle periods can allow corrosion or sticking to develop.
Engineers can select materials and spring arrangements around the expected duty cycle. Where appropriate, a custom design can limit unnecessary contact forces or avoid mechanical interference throughout the stroke.
Service teams benefit when engineers define practical inspection and replacement criteria early. Repeatable production dimensions also help technicians replace a component without extensive adjustments. A reliable actuator should fit the equipment’s maintenance plan as well as its performance targets.
Validate Against Real Conditions
The strongest design decision won’t help if engineers test only ideal conditions. A component may pass a room-temperature cycle test but behave differently after thermal changes or vibration exposure.
Prototype testing should combine the variables that drive real failures. A team can measure actuation current after a cold soak, then check timing across expected supply voltages. When necessary, engineers can follow a tailored environmental testing approach informed by MIL-STD-810 rather than assuming a universal test sequence applies.
By reviewing the assembled system, teams can catch problems at the actuator interface before production. That feedback also makes design revisions more focused, limiting surprises later.
A More Reliable Starting Point
Among the ways custom solenoids improve military equipment reliability, tailored force margins and environmental protection offer meaningful advantages. No single component can eliminate every equipment risk or replace system-level validation.
The best projects start with clear requirements for operating conditions and service life. Solenoid Systems works with engineering teams on custom solenoid and valve development, from early design through prototype evaluation. Reach out to discuss the constraints of your next equipment program and explore a solution that fits its needs.
