InElectric actuatorIn the selection process, high precision and low power consumption are the core requirements, but they need to be combined with control mode adaptability to form the three key performance indicators. Here is a specific analysis:
1. Control accuracy: dual guarantee of error and stability
Core parameters: Basic error (≤± 1.5%), variation (repeatability error), sensitivity (such as 240A current response).
Technical manifestation:
Position feedback system: using an absolute encoder (not an analog potentiometer or battery dependent type) to ensure that the valve position is not lost after power failure, and the opening limit device is reliable to avoid over opening/over passing.
Closed loop control: Adjustable actuators achieve precise opening control through 4-20mA current signals or 1-5V voltage signals, with errors controlled within ± 1%.
Application scenarios: chemical process control, water treatment systems, and other scenarios that require precise flow regulation. High precision can avoid product batch differences or system oscillations.
2. Power consumption optimization: balanced design of energy efficiency and heat dissipation
Core parameters: motor power, rated current, secondary control circuit voltage.
Technical manifestation:
Variable frequency drive technology: By adjusting the motor frequency to reduce energy consumption, such as automatic frequency reduction during partial load operation.
Energy recovery system: Some high-end models utilize braking energy to feed back to the grid, with an energy-saving rate of up to 20% -30%.
Low power standby mode: The current drops to milliampere level during standby, extending the lifespan of the device.
Application scenario: Long term operating industrial systems (such as power and metallurgy), low power consumption can directly reduce operating costs, while reducing heat dissipation requirements and improving equipment reliability.
3. Control mode adaptability: scene based selection of switch type vs adjustment type
Core parameters: Control signal type (current/voltage), working mode (electric on/electric off), signal loss protection.
Technical manifestation:
Switch type (open-loop control): Suitable for fully open/fully closed scenarios (such as fire valves), it needs to support passive, 24V DC or 220V AC switch signal, and the power needs to match the motor requirements.
Regulating type (closed-loop control): It is necessary to clarify the signal logic of electric opening type (4mA corresponds to valve closed, 20mA corresponds to valve open) or electric closing type, and configure signal loss protection (fully open/fully closed/maintain in place).
Intelligent communication function: Supports fieldbus protocols such as Modbus and Profibus, enabling remote monitoring and parameter adjustment.
Application Scenario:
Switch type: Simple fluid control (such as water supply and drainage systems), low cost and easy maintenance.
Regulating type: Complex process flows (such as petroleum refining) require integration with DCS systems to achieve automated control.
Selection Decision Suggestions
Precision priority scenario: Choose closed-loop control+absolute encoder model to ensure long-term operational stability.
Power sensitive scenarios: prioritize variable frequency drive+energy recovery technology, combined with low-power standby mode.
Control mode matching: Determine the switch type or regulating type according to process requirements, and verify signal compatibility (such as matching 4-20mA with PLC).
Environmental adaptability: Confirm the protection level (IP67 or above) and explosion-proof certification (such as Ex d IIB T4), and adapt to harsh working conditions.