Permanent magnet high speed electromagnet

Abstract

The invention provides a permanent magnet high-speed electromagnet. It includes iron core, coil and outer shell. The iron core is composed of cylindrical main magnetic pole and circular auxiliary magnetic pole. There is a coil installation slot between the main magnetic pole and the auxiliary magnetic pole. The coil is installed in the coil installation slot, and the outer shell is set on the iron core In addition, an annular flange extends from the bottom of the main magnetic pole or the auxiliary magnetic pole, and also includes an annular permanent magnet. The permanent magnet is embedded between the annular flange and the main magnetic pole or the auxiliary magnetic pole. The magnetization direction of the permanent magnet is radial radiation magnetization. . The magnetic field generated by the coil and the permanent magnet produce a superposition of the magnetic field. On the one hand, the permanent magnet shields the leakage flux between the main and auxiliary magnetic poles, and on the other hand, it provides the magnetic flux passing through the armature, which increases the electromagnetic force; the flange of the main magnetic pole or the auxiliary magnetic pole The setting of can prevent the phenomenon of local premature saturation, and it also has the effect of increasing the electromagnetic force while keeping the driving current unchanged.

Description

technical field [0001] The invention relates to an electromagnet, in particular to a high-speed electromagnet for an electronically controlled fuel system of a diesel engine. Background technique [0002] The electronically controlled fuel injection technology is the third technical leap of the diesel engine fuel system after the mechanical fuel system, supercharging and intercooling technology. With the continuous development of diesel engine electronic control technology, electronically controlled fuel injection system has become an inevitable trend to meet the increasingly stringent diesel engine emission regulations. An electromagnet whose response speed can reach milliseconds can be called a high-speed electromagnet. The high-speed electromagnet is one of the key actuators of the diesel fuel electronically controlled high-pressure fuel system, and is also the core component to ensure the normal operation of the fuel system. Its quick response determines the dynamic pe...

AI Technical Summary

Problems solved by technology

In order to meet the electromagnetic force and fast response requirements of the electromagnet, it is often driven by a large current, and the increase of the driving current will lead to an increase in the calorific value of the coil and an increase in the operating temperature of the electromagnet, which will lead to a decrease in the magnetic permeability of the magnetic material, which is prone to Magnetic saturation, reducing the reliability and stability of the system

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