Linear-turn Electric Actuator
Working principle of frequency converter
As a mature product, the frequency converter has been widely used in various industrial production fields. Our company has successfully integrated the frequency conversion technology into the control of the actuator, realized the speed, steering and torque adjustment functions, and thus controlled the valve.
AC frequency conversion speed regulation principle
According to the principle of the motor, the speed of the AC asynchronous motor can be expressed by the following formula: n=60f/p(1-s) where n-motor speed: p-motor pole pairs; f-power frequency; s-slip. It can be seen from the formula that the factors affecting the motor speed are: the number of magnetic pole pairs p of the motor, the slip rate s and the power frequency f. Changing the frequency of the power supply can realize motor speed regulation, that is, frequency conversion speed regulation. Realization of frequency conversion function: AC-DC-AC frequency conversion method is adopted, mainly composed of rectification and inverter circuits.
Current limiting and filtering
The filter capacitor Czk filters out the voltage ripple after rectification, and keeps the voltage stable when the load changes. When the main circuit is powered on, the instantaneous impact current is large. In order to protect the circuit components, a current limiting resistor Rv is added. After a period of delay, it passes through the control circuit. Close the switch and short the current limiting resistor.
Rectification
The three-phase AC power supply is rectified by a high-power rectifier bridge to convert the AC voltage into a DC voltage.
Inversion (DC-AC) and pulse width modulation
Through the three-phase inverter bridge composed of inverter switching tubes (IGBT), the SPWM pulse width modulation technology combined with special algorithms is used to adjust the output frequency and output voltage, and control the speed, steering and torque of the motor.
Built-in integrated frequency converter
The actuator has a built-in integrated frequency converter, which has more functions and advantages than traditional actuators, better valve protection and optimal control.
Flexible control
When the valve starts, the actuator operates at low speed and high torque; when the valve is close to fully open and fully closed, the actuator will automatically decelerate and position at low speed, effectively avoiding the impact of inertia on the valve and prolonging the service life of the valve
Power supply phase sequence automatic recognition
Because of the adoption of intelligent technology, the product can automatically identify the phase sequence of the power supply. Therefore, the power line can be connected at will, and the installation and debugging are easier and faster. Due to the use of frequency conversion technology, the impact of power frequency and voltage fluctuations on the actuator can be effectively avoided.
The speed and torque of opening closing are set independently, and the valve is optimally controlled
According to the actual needs of on-site process control, the speed (step size 5%) and torque (step size 10%) of the opening and closing directions can be set separately and independently to meet the needs of different processes or different operating stages, and realize the most optimal control process. optimization.
Proprietary and unique EMC filter circuit, effectively improve anti-interference ability
The proprietary EMC filter circuit, on the one hand, can avoid the interference of the external environment on the product and improve the reliability of the product; on the other hand, it can avoid the pollution of the product operation to the power grid
Multiple safety protections ensure the safety of the system and actuators and protect the motor from overheating
Through the composite sensor, the precise detection of torque, current and temperature can be realized, and the effective protection of overcurrent, overheat and overtorque can be achieved.
Adjustable torque and speed, reduce inventory and save cost
The cut-off torque and output speed can be set within a wide range. Therefore, only a small number of specifications and models of multi-turn actuators are required to be equipped with corresponding reduction boxes or linear propulsion devices to form actuators with various torques (thrusts). Thereby reducing the inventory of complete machine spare parts and spare parts
Hall sensor
Two Hall elements distributed at an electrical angle of 90° are installed outside the motor shaft, and 24 magnetic poles are installed on the motor shaft. The motor generates 48 voltage pulses per revolution, and the pulse signals are processed by the microprocessor to obtain accurate displacement and steering. Multiple parameters such as speed and speed, the position determination has been carried out, each change is detected and stored, the Hall sensor is not affected by the change of the external environment temperature, the work is stable and reliable, the measurement accuracy is high, the anti-interference ability is strong, and the service life Long and never wear out.
Halfway limit protection function
The actual position of the actuator can be accurately detected through the Hall sensor. Once the position you set is reached, the CPU outputs the switch position signal through the relay on the control relay board. When it reaches the two limit positions of fully open or fully closed, the CPU controls the frequency converter to cut off the power supply of the motor immediately, thereby realizing limit protection.
The data does not depend on the battery and can be stored for a long time
Due to the use of special data processing and storage, the operating data can also be stored for a long time in the case of power failure, realizing permanent data security. The built-in electric carp and supercapacitor energy storage only work when the handwheel is operated to record the change of the valve position when the power is off. On the other hand, it is used to check the current data of the actuator when the power is off.
Company Profile
Founded in 2014, Freya is mainly engaged in fluid control products and services such as actuators, valve electric devices, and electric valves. It focuses on the field of process industry and has long been committed to providing professional According to the actual working conditions, through the necessary on-site surveying and mapping and technical clarification, we provide customers with safe, economical and environmentally friendly selection and design, supply strictly in accordance with the contract requirements and guide the installation and commissioning, and hand over for use after reaching the standard. Thanks to the trust of the vast number of users, through long-term and extensive on-site services and the effective accumulation of technical experience, the company accurately understands the real needs, pain points and expectations of equipment manufacturers of users and the market. Intelligent electric actuator, reliable, durable, easy to use, cost-effective, and guaranteed service. Being close to users, providing full-process services, comprehensive services, value-added maintenance services, and escorting users' production is our differentiated advantage. Freya SD intelligent electric actuators and valve electric devices provide a two-year warranty after installation and commissioning, and free after-sales service for life. Technical quality and commercial credit are the foundation of the company's survival and the two wheels that drive the company's development. Users feel at ease, peace of mind, and happiness, which is the only criterion for evaluating our work effect and demonstrating the value of existence. Many of the company's customers are located in thermal power, petrochemical, coal chemical, water treatment and other fields, all over the country, including more than 100 end users belonging to the five major power generation groups, the three major nuclear power groups, Sinopec, PetroChina and local energy groups.
Cooperative customers
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