What are the characteristics of permanent magnet coupler

Permanent magnet couplers also have their limitations. According to the classification, different types should be selected to adapt to different working conditions. Can not completely replace the frequency converter, hydraulic coupling and other products (in some special occasions), but also can not replace the reducer, gearbox. There is no energy saving effect on the load of constant torque and constant power. The energy-saving effect of the speed-regulating permanent magnet coupler is only reflected in the equipment with centrifugal load, which is determined by the characteristics of the centrifugal equipment itself, not the characteristics of the permanent magnet coupler itself. Other speed control devices (frequency converter, hydraulic coupling, etc. also have energy saving effect.

characteristics of permanent magnet coupler:

1. The installation is simple, the site change is small, and the large alignment error can be tolerated.

2. The starting is flexible, which greatly reduces the starting current of the motor and prolongs the service life of the equipment.

3. No mechanical connection, isolate vibration, allow impact load, and extend the service life of all parts (bearings, seals, etc.).) The transmission system.

4. The torque transmission is realized, and the energy saving rate is greater than 10%.

5. Environmental protection, no harmonics, no electromagnetic interference.

6. Strong environmental adaptability, can work normally in harsh environments such as humidity, dust, flammable and explosive, serious harmonics, and large power grid fluctuations.

7. Maintenance-free.

8. The design service life is 30 years.

The permanent magnet coupler is installed between the motor and the load, and the torque transmission from the motor to the load end is realized through the air gap between the conductor rotor and the permanent magnet rotor. Its working principle is: when the conductor rotor and the permanent magnet rotor move relative to each other, the conductor rotor cuts the magnetic lines of force, and an induced current is generated in the conductor rotor, and the induced current generates an induced magnetic field. The induced magnetic field interacts with the magnetic field generated by the permanent magnet rotor to achieve Torque transmission between the two.

The permanent magnet coupler body comprises: 1. Permanent magnet rotor (connected to the load side);2. Conductor rotor (connected to the motor side);3. Speed control mechanism. The speed regulating mechanism can adjust the distance between the relative position of the permanent magnet rotor and the conductor rotor, and change the coupling strength generated by the magnetic field generated between the permanent magnet rotor and the conductor rotor, thereby changing the transmitted torque. When the distance is closer, the torque transmitted by the permanent magnet coupler increases and the load speed increases. When the distance is longer, the torque transmitted through the permanent magnet coupler becomes smaller and the load speed decreases.

The motor of the permanent magnet coupler provides power for the speed regulating mechanism and acts according to the instructions of the control center. The distance between the conductor rotors of the permanent magnet rotor can adjust the torque output and feedback the result to the control center. The control center can be PLC control unit, intelligent instrument control unit or DCS control class.

The control signal source of the permanent magnet coupler is the control object required by the process, which can be the pressure, flow or liquid level of the water pump system pipe network. For fan systems, it may be process parameters such as pressure and flow. Therefore, the control signal source can be pressure, flow, liquid level and other parameters, through the transmitter into a 4 ~ 20ma current signal, indicating the action of the electric actuator. The permanent magnet coupler realizes the contactless connection between the motor and the load, and effectively solves the problems of centering, soft start, speed regulation, energy saving and vibration reduction of the rotating load system.