Magnetic suspension permanent-magnet direct-drive high-speed motor

Abstract

The invention discloses a magnetic suspension permanent-magnet direct-drive high-speed motor, which comprises a shell, a stator, a permanent-magnet rotor, a main shaft and two groups of bearing assemblies, wherein the two groups of bearing assemblies are arranged at the front end and the rear end of the main shaft respectively; the stator is fixed in the shell; the permanent-magnet rotor is arranged on the main shaft and emptily sleeved with the stator; each bearing assembly comprises a bearing block, a radial magnetic bearing, a thrust magnetic bearing and an auxiliary bearing; the radial magnetic bearings, the thrust magnetic bearings and the auxiliary bearings are sequentially arranged from the middle part of the main shaft to two ends of the main shaft; the main shaft is provided with a thrust shaft shoulder; and a thrust magnetic gap is arranged between the end surface of the thrust shaft shoulder and the thrust magnetic bearings. The magnetic suspension permanent-magnet direct-drive high-speed motor disclosed by the invention has the advantages that the mass and the rotational inertia of a motor rotor shaft system are small, the critical rotating speed of the shaft system is high, the strength and the security risk are low and the magnetic suspension permanent-magnet direct-drive high-speed motor is convenient to disassemble, assemble and adjust.

Description

technical field [0001] The invention relates to a high-speed motor, in particular to a magnetic levitation permanent magnet direct drive high-speed motor. Background technique [0002] Direct-drive high-speed motor is a new product that replaces "traditional low-speed motor + gearbox or belt drive system", and can be widely used in steam compressors, refrigeration compressors, air compressors, blowers, expanders, gas turbine power generation, waste heat power generation , desulfurization and dust removal and other high-speed turbomachinery fields. Since the direct-drive high-speed motor overcomes the shortcomings of "traditional low-speed motor + gearbox or belt drive system" such as high energy consumption, high noise, large vibration, and many fault points, it can obtain significant efficiency enhancement, energy saving, and noise reduction effects. Therefore, in recent years, the market's demand for high-speed motors has become more and more urgent. [0003] According t...

AI Technical Summary

Problems solved by technology

The thrust magnetic bearing of the thrust disc has obvious disadvantages: (1) It increases the mass and moment of inertia of the motor rotor shaft system, resulting in a decrease in the critical speed of the shaft system, which is not conducive to increasing the working speed of the motor; (2) the thrust disc has a large diameter and a high When the speed rotates, the linear velocity of the outer circle is also high, the centrifugal stress increases, and there are strength and safety risks, which is not conducive to the realization of high speed; (3) Once the thrust plate is removed and reassembled, the fit of the assembly contact surface will be more or less reduced. Changes will cause the dynamic balance of the rotor shaft system to be destroyed, and it is necessary to re-balance the dynamic balance before it can be used again, which is very troublesome to use

Forced water cooling will cause difficulties in sealing the magnetic bearing seat, and electrical short-circuit faults will easily occur in the event of leakage

Due to the poor cooling effect of the natural cooling method, the temperature rise of the magnetic bearing will be too large, causing the resin of the magnetic bearing plastic seal to become soft, resulting in thermal denaturation of the sensor seat, which seriously affects the working performance of the magnetic bearing

[0009] Due to the above shortcomings of the existing maglev permanent magnet direct drive high-speed motors, the maglev permanent magnet direct drive high-speed motors have not been widely used in the fields of high-speed turbomachinery such as compressors, blowers, expanders, gas turbine power generation, waste heat power generation, desulfurization and dust removal. application

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