News
10
2022
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10
What does a permanent magnet coupler look like? Let's get to know
To isolate the motor and other electrical components from the downhole environment, torque is transferred from the motor to the hydraulic section through a permanent magnet coupling. The pending patent for the upper wing magnetic coupling can work under large gaps and transmit very high torque from the very low speed of the pump (100 r/min) to the very high speed of the compressor (over 500 r/min).
The permanent magnet coupling includes an inner rotor connected to the thrust module shaft, and a surrounding sleeve for protecting the magnets that generate the magnetic field. The inner rotor is designed to be exposed to downhole fluids and provides a completely sealed assembly that can work in high-pressure and high-temperature drilling environments, extending the service life of the equipment. The outer rotor of the permanent magnet coupler is sealed with a permanent magnet motor in the sealing part. Due to its large diameter, it produces a large wind loss, so it is kept in a low-pressure gas environment. This configuration allows for less fluid friction losses and does not require any special cooling. The isolation seal between the inner and outer rotors may allow the magnetic field connection between the two rotors to transfer torque from the outer rotor to the inner rotor without any slippage. The upstream permanent magnet coupler allows any downhole rotating system to work without complex seals (I. e., no protection).
The permanent magnet coupling realizes the torque transmission from the motor to the load through the air gap between the conductor disk and the permanent disk. This technique achieves no mechanical connection between the driver (motor) and the driven (load). Its working principle is that a disk with a metal oxide neodymium iron boron at one end interacts with an induced magnetic field at the other end to generate torque. The permanent magnet coupler is mainly composed of a conductor rotor and a permanent magnet rotor. The conductor rotor is fixed on the motor shaft, and there is a gap (air gap) between the permanent magnet rotors. In this way, the original hard (mechanical) connection between the motor and the load becomes a soft (magnetic) connection.
Permanent magnet coupler technical features:
1. By adjusting the speed of the load, energy saving is realized.
It can be controlled by the controller, and can accept pressure, flow and liquid level control signals.
3. Realize soft start and solve problems such as blocked rotation.
4. Eliminate system vibration, extend system equipment life and improve reliability.
5. Adapt to various harsh working environments: high temperature, low temperature, large grid voltage fluctuations, high lightning, high harmonic content, flammable and explosive, humid, and high dust content.
6. No harmonic generation, not affected by grid voltage fluctuations.
Permanent magnet coupler advantages:
1) Simple structure and low cost
2) Simple installation and maintenance-free.
3) Large alignment errors are tolerated.
4) Isolate/reduce vibration of motor and load.
5) Extend the service life of the equipment (bearing/oil seal)
6) Transmission and buffer start.
For more information about permanent magnet couplers, you can contact us.
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