Introduction to the working principle and structural characteristics of permanent magnet submersible motors?

Introduction to the working principle and structural characteristics of permanent magnet submersible motors?

Permanent magnet submersible motor is a type of motor that uses the magnetic field generated by permanent magnets to drive the rotor to rotate. It has the characteristics of compact structure, small volume, high efficiency, and strong reliability, and is widely used in fields such as submersible pumps, water treatment equipment, and ships.

The working principle of permanent magnet submersible motors mainly includes the following points:

Magnetic field generation: Permanent magnet submersible motors usually use permanent magnets as the main magnetic poles, which generate a stable magnetic field by passing direct current through them. This magnetic field is fixed and will not change due to changes in external conditions.

Magnetic field induction: Under the action of the magnetic field of a permanent magnet, the conductor in the rotor will induce an electromotive force. Due to the iron core of the rotor, the electromotive force induced by the conductor will cause a change in the current in the rotor, thereby creating a magnetic field on the rotor.

Magnetic field interaction: Under the interaction between the magnetic field generated by the permanent magnet and the magnetic field generated in the rotor, a torque of the magnetic field will act on the rotor, causing it to start rotating. Meanwhile, the rotation of the rotor causes the conductor to move in a magnetic field, resulting in induced electromotive force and induced magnetic field, which continue to drive the rotation of the rotor.

Torque regulation: To adjust the torque of a permanent magnet submersible motor, the magnetic field strength of the permanent magnet can be changed or the current of the conductor in the rotor can be changed. By controlling these two parameters, the motor torque can be adjusted.

The structural characteristics of permanent magnet submersible motors mainly include the following points:

Compact structure: Permanent magnet submersible motors usually adopt an outer rotor structure, where the rotor is located outside the motor, which can make the overall structure of the motor more compact and suitable for installation and use in limited space.

Efficiency: Due to the use of permanent magnets to generate magnetic fields, permanent magnet submersible motors have higher efficiency compared to traditional excitation motors. Due to the fact that permanent magnets do not require current excitation from external power sources, energy consumption is saved and the efficiency of the motor is improved.

Strong reliability: Permanent magnets are a fixed magnetic field source and are not affected by external conditions. Therefore, permanent magnet submersible motors have high reliability and are less prone to malfunctions during operation.

Strong load adaptability: Permanent magnet submersible motors have good adaptability when the load changes. By adjusting the magnetic field strength of the permanent magnet or changing the current of the conductor in the rotor, the motor torque can be adjusted to meet different load requirements.

Low noise: Due to the use of an external rotor structure in the permanent magnet submersible motor, the rotor is located outside the motor, which can reduce vibration and noise generation, resulting in lower noise generated during motor operation.