To select the optimal electric linear actuator for your specific application, a systematic evaluation of core dimensions-including load capacity, stroke length, speed, operating environment, and mounting method-is essential. By accurately matching product parameters to practical requirements, you can avoid inefficiencies, shortened service life, or safety hazards caused by improper selection. Below is a step-by-step professional selection guide, suitable for diverse scenarios such as industrial, commercial, and residential use.
I. Clarify Core Operational Parameters (Foundation of Selection)
1. Load Capacity: Match Actual Force Requirements
Calculate Actual Load: Consider static load (e.g., weight of the object), dynamic load (e.g., inertial force during movement), and additional resistance (e.g., friction, wind force). It is recommended to select a model with a safety factor of 1.2~1.5 × actual load to prevent damage from overloading.
Examples: Smart home lifting tables require 50~100kg load capacity; industrial robotic arms may need 500~5000kg for pushing tasks; medical beds should accommodate both human weight and equipment weight (recommended ≥200kg).
Distinguish Load Types:
Tensile Load: For tensile material transfer, focus on the actuator's tensile strength;
Compressive Load: For pushing mechanical movements, ensure the actuator's resistance to compressive deformation;
Combined Load: For applications involving both push/pull and lateral forces, choose models with guiding mechanisms or strong anti-offset capabilities (e.g., ball screw electric linear actuators).
2. Stroke Length: Precisely Match Movement Distance
Measure Effective Stroke: The distance of the actuator's reciprocating movement (from fully retracted to fully extended). Reserve 5~10mm of redundant stroke to avoid failure to reach the specified position due to installation errors.
Examples: Small smart locks require 5~20mm stroke; agricultural greenhouse window opening needs 500~1500mm; industrial production line transfer can be customized to over 2000mm.
Note the Relationship Between Stroke and Load: The maximum load of some actuators may decrease slightly with increasing stroke. For long-stroke scenarios (>1000mm), prioritize models with high-rigidity structures (e.g., trapezoidal screw + metal housing).
3. Operating Speed: Balance Efficiency and Stability
Determine Required Speed: Select based on the efficiency needs of the application. Speed is typically measured in mm/s, and note that "speed is inversely proportional to load"-higher loads result in slower speeds, and vice versa.
Low-Speed Scenarios (0.1~5mm/s): For medical equipment (bed lifting, rehabilitation devices) and precision instrument positioning, prioritize stability and positioning accuracy;
Medium-Speed Scenarios (5~50mm/s): For smart homes (lifting tables, electric curtains) and commercial equipment (advertising screen switching), balance efficiency and quiet operation;
High-Speed Scenarios (50~200mm/s): For industrial automation production lines and material handling equipment, choose high-power motors + efficient transmission structures (e.g., ball screws).
4. Operating Frequency & Duty Cycle: Adapt to Usage Intensity
Operating Frequency: The number of start-stop cycles per unit time (e.g., 10 starts per hour vs. 100 starts per hour);
Duty Cycle: The ratio of the actuator's energized working time to total time (e.g., 50% duty cycle = 10 minutes of operation, 10 minutes of rest).
Intermittent Operation (e.g., home electric sofas, <50 starts per day): A standard duty cycle (20%~30%) is sufficient;
Continuous Operation (e.g., 24/7 industrial production lines): Select models with high duty cycles (≥50%) and good heat dissipation to prevent motor burnout from overheating.
II. Adapt to Operating Environment and Mounting Conditions
1. Environmental Factors: Address Challenges of Temperature, Humidity, and Media
Temperature Range:
Conventional Scenarios (-10℃~60℃): For indoor smart homes and office equipment, choose standard models;
Extreme Low Temperatures (-40℃~-10℃): For outdoor industrial equipment and polar research instruments, select low-temperature-adapted motors (low-temperature-resistant lubricants + waterproof seals);
High-Temperature Environments (60℃~120℃): For industrial machinery near heat sources, choose high-temperature-resistant motors and heat-insulating housings.
Humidity & Protection Level:
Indoor Dry Environments: IP54 protection (dustproof + splash-proof) is sufficient;
Humid/Outdoor Environments (e.g., bathrooms, outdoor equipment): Require IP65 or higher protection (fully dustproof + water jet-proof) to avoid motor short circuits from water ingress;
Corrosive Environments (e.g., chemical equipment, coastal areas): Choose stainless steel or corrosion-resistant coated actuators with corrosion-resistant motors.
Special Environments: Explosion-proof certified motors are required for explosive scenarios (coal mines, chemical workshops); sealed actuators with no dust leakage are suitable for dust-free environments (electronic factories, medical operating rooms).
2. Mounting Method: Match Equipment Structure and Space
Common Mounting Methods:
Two-End Hinged (Rod Ends): Suitable for movements with angle changes (e.g., robotic arm joints, folding equipment), which can offset installation errors and lateral forces;
One-End Fixed + One-End Free: For linear reciprocating movements (e.g., lifting platforms, sliding doors), ensure the actuator's axis aligns with the direction of movement;
Side Mount/Inverted Mount: For space-constrained scenarios (e.g., inside small equipment), choose short-body actuators to avoid interfering with other components.
Space Constraints: Measure the reserved installation space (length, width, height) and select a model with appropriate dimensions. For long-stroke scenarios, consider the overall length of the extended actuator to prevent conflicts with other structures.
III. Focus on Core Performance and Additional Functions
1. Transmission Structure: Affects Precision, Service Life, and Noise
| Transmission Type | Advantages | Disadvantages | Suitable Scenarios |
|---|---|---|---|
| Trapezoidal Screw | Low cost, high load capacity, simple structure | Slow speed, moderate noise, slight wear | Industrial heavy loads (e.g., material pushing), low-frequency use |
| Ball Screw | High precision (repeat positioning error ±0.1mm), fast speed, low wear, quiet | Higher cost, weaker impact resistance | Precision equipment (e.g., medical instruments, automation lines), high-frequency use |
| Timing Belt | Long stroke, fast speed, moderate cost | Weak load capacity (≤50kg) | Light-load, high-speed scenarios (e.g., advertising screen sliding, small conveyors) |
2. Control and Feedback Requirements: Adapt to Automation Systems
Control Methods:
Basic Control: Manual switches, remote control (suitable for smart homes and small equipment);
Automatic Control: PLC, single-chip microcomputer, bus control (Modbus, CANopen) for industrial automation lines, enabling precise positioning and linkage control;
Emergency Stop: For high-risk scenarios (e.g., heavy equipment, medical devices), select actuators with emergency stop buttons or power-off self-locking functions to prevent accidental falls.
Feedback Functions:
Position Feedback: Achieve precise positioning via encoders or potentiometers (e.g., lifting platforms requiring arbitrary stop positions);
Status Feedback: Motor overload protection and stroke limit switches (preventing the actuator from exceeding its stroke range) enhance operational safety.
3. Noise and Service Life: Balance User Experience and Economy
Noise Requirements: Indoor scenarios (e.g., bedrooms, offices, medical rooms) require quiet actuators with noise ≤50dB (ball screw + quiet motor); industrial scenarios have lower noise requirements (≤70dB is acceptable).
Service Life: Pay attention to the actuator's rated service life (usually counted by operating cycles or hours). For high-frequency use, select models with a service life ≥100,000 cycles to reduce replacement costs.
IV. Selection Verification and Pitfall Avoidance
Reverse Verify Parameters: Confirm that "load × safety factor ≤ maximum actuator load", "stroke + redundancy ≤ maximum actuator stroke", and "actual speed ≤ rated speed" to avoid parameter exceeding;
Prioritize Industry Case Matching: Reference selection schemes for similar applications in the same industry (e.g., Xiamen Kaba Electric Linear Actuator's cases for medical beds and industrial heavy-load solutions) to reduce trial-and-error costs;
Consult Supplier Technical Support: Provide detailed application parameters (load, stroke, speed, environment, mounting method) for professional recommendations. Request sample testing if necessary to verify practical performance;
Avoid Over-Selection: Do not pursue "higher parameters = better". For example, choosing a heavy-load actuator for light-load scenarios increases costs and energy consumption, while high-speed actuators for low-speed use cause increased noise and wear-precision matching is key.
Summary
The core logic of selection is to center on practical needs, base on parameter matching, and supplement with environmental adaptation: first clarify core parameters such as load, stroke, and speed, then narrow down options based on environment and mounting conditions, and finally optimize the experience through transmission structure and control functions. For precise selection recommendations for specific scenarios (e.g., industrial heavy loads, smart homes, medical equipment), please provide detailed requirements to match the most suitable model.
