A three-degree-of-freedom implicit Lorentz force magnetic bearing

Abstract

The invention discloses a three-degree-of-freedom hidden lorentz force magnetic bearing which mainly comprises a rotor system and a stator system. The rotor system mainly comprises an external mounting sleeve, an external magnetic conductive ring, an external magnetism-insulating ring, an external magnetic steel, an external paramagnetic ring, a turntable, an internal mounting sleeve, an internal magnetic conductive ring, an internal magnetism-insulating ring, an internal magnetic steel and an internal paramagnetic ring. The stator system comprises a stator skeleton, an aluminum substrate, a winding and epoxy glue. A magnetic steel built-in hidden scheme is adopted by the invention for promoting the airtight uniformity of air gaps. The axial magnetic steel and the axial winding are added, so that the control on axial translation and radial two-degree-of-freedom deflection can be realized.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a three-degree-of-freedom implicit Lorentz force magnetic bearing. Background technique [0002] According to the electromagnetic force generation method, active magnetic bearings can be divided into reluctance magnetic bearings and Lorentz force magnetic bearings. The former generates the required control magnetic flux by changing the magnitude and direction of the magnetic pole winding current, thereby generating the corresponding suspension support force, but its force has a square relationship with the current. After linearization, the linear range is still narrow and the control accuracy is low. The latter generates the required suspension support force by changing the current magnitude and direction of the winding placed in a constant magnetic field, and its force has a linear relationship with the current, with good linearity and high control precision. Therefo...

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Problems solved by technology

However, its double-stator structure increases the radial size of the rotor, and its magnetic steel is located at the top of the magnetic pole, and the magnetic flux leakage at the edge of the air gap is obvious, which reduces the uniformity of the magnetic density.

In addition, the radius of the circle where the magnetic steel is located is relatively large, and the entire ring of magnetic steel needs to be spliced ​​by multiple pieces of magnetic steel. The splicing gap will cause the circumferential fluctuation of the magnetic density, which further reduces the uniformity of the air gap magnetic density.

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