Magnetic circuit design of magnetic pump
The magnetic circuit design of the magnetic pump is a key link to ensure that the magnetic pump can operate efficiently, stably and safely. The following is a detailed analysis of the magnetic circuit design of the magnetic pump:
1. The importance of magnetic circuit design
The quality of the magnetic circuit design directly affects the safety, quietness, efficiency and other aspects of the magnetic pump. Reasonable magnetic circuit design can ensure that the magnetic pump is stable and reliable when transmitting power, reduce energy loss, and improve the overall performance of the pump.
2. The main requirements of magnetic circuit design
High requirements for magnetic circuit stability
Magnetic circuit stability is one of the important guarantees for the performance and service life of the magnetic pump. In order to ensure the stability of the magnetic circuit, the permanent magnetic material and the current, wire cross-sectional area and other parameters of the electromagnetic winding must be selected reasonably to avoid overload or overvoltage.
High requirements for magnetic circuit thermal stability
The thermal stability of the magnetic circuit means that the performance of the magnetic circuit does not change under high temperature environment. In order to ensure the thermal stability of the magnetic circuit, materials with high temperature durability and good antimagnetic properties should be selected, such as alumina ceramics, iron silicon aluminum, etc.
Low requirements for magnetic circuit noise
The noise of the magnetic circuit mainly comes from the vibration of the magnetic structure and the alternation of magnetic force. In order to reduce noise, the structure of the magnetic circuit should be relatively stable, and the frequency of magnetic force changes should be minimized.
High requirements for magnetic circuit sealing
Since the magnetic pump has no mechanical seal when working, the sealing of the magnetic circuit is particularly important. In order to ensure the sealing of the pump, the sealing of the magnetic circuit must be improved to avoid leakage in the air gap of the magnetic material.
High requirements for the contact surface of the magnetic circuit
The contact surface of the magnetic circuit is the core part of the magnetic pump to transport liquid, and its contact area directly affects the efficiency and energy consumption of the pump. In order to improve efficiency and reduce energy consumption, the contact area of the magnetic circuit should be expanded as much as possible to increase the flow rate and pressure of the transported liquid.
3. Key elements of magnetic circuit design
Selection of magnetic materials
The selection of magnetic materials is the core of magnetic circuit design. Commonly used magnetic materials include rare earth permanent magnet materials (such as neodymium iron boron, samarium cobalt, etc.) and ferrites. Rare earth permanent magnet materials have the advantages of high magnetic energy product and large coercive force, but the price is relatively high; ferrites have lower costs, but relatively weak magnetic properties.
Design of magnetic circuit structure
The design of the magnetic circuit structure should ensure smooth and stable magnetic force transmission. It usually includes components such as inner magnetic steel, outer magnetic steel and isolation sleeve. The inner magnetic steel and the outer magnetic steel transmit power through magnetic coupling, and the isolation sleeve plays the role of isolation and protection.
Design of cooling system
When the isolation sleeve is made of metal material, eddy current heat will be generated, causing the working environment temperature of the permanent magnet to rise. Therefore, it is necessary to design a reasonable and effective cooling and heat dissipation system to reduce the working temperature of the permanent magnet and ensure the stability and reliability of the magnetic circuit.
Calculation of magnetic torque and eddy current loss
The accurate calculation of magnetic torque and eddy current loss is an important part of magnetic circuit design. The magnitude of magnetic torque and eddy current loss can be accurately predicted by calculation methods such as finite element method, providing a scientific basis for magnetic circuit design.
