Back-winding winding gullet-free high-speed permanent magnet motor with non-magnetic-conductive intervals on stator side

Abstract

The invention discloses a back-winding winding gullet-free high-speed permanent magnet motor with non-magnetic-conductive intervals on a stator side. Wherein the motor stator The back-winding windinggullet-free high-speed permanent magnet motor comprises a motor stator and a motor rotor. The motor stator comprises a stator iron core, a winding wound on the stator iron core and a non-magnetic gaparranged between the air gap side gullet-free windings., the The motor rotor comprises a rotating shaft, a permanent magnet and a rotor sheath sleeved on the outer surfaces of the rotating shaft and the permanent magnet, and a casing is arranged on the outer side of the motor stator; tooth grooves are machined in the outer surface of the stator iron core, and no tooth grooves are formed in the inner surface of the stator iron core. According to the invention, aAir-gap magnetic field high-frequency harmonic waves caused by stator core slotting can be avoided, rotor eddy-current loss and permanent magnet heating are further reduced, physical isolation between windings can be realized, occurrence of phase-to-phase faults is inhibited, fault-tolerant operation of the motor is facilitated, andthe reliability of the motor is effectively improved.

Description

technical field [0001] The invention relates to a high-speed permanent magnet motor, in particular to a high-speed permanent magnet motor with a back-wound winding without cogging and a non-conductive space on the stator side. Background technique [0002] Due to the advantages of high power density, high efficiency, fast dynamic response, simple rotor structure and high strength, high-speed permanent magnet motors are widely used in high-speed fields such as centrifugal compressors and vacuum pumps. [0003] Considering the characteristics of limited tensile strength and high compressive strength of permanent magnet materials, in order to protect permanent magnets from being damaged by high-speed centrifugal force, a high-strength sheath is usually installed outside the permanent magnets to apply pre-tightening force to protect them. Since the alternating frequency of the magnetic field of the high-speed permanent magnet motor is very high, the problem of eddy current loss ...

AI Technical Summary

Problems solved by technology

Since the alternating frequency of the magnetic field of the high-speed permanent magnet motor is very high, the problem of eddy current loss induced in the rotor sheath and permanent magnet by the slotting of the stator core and the high-frequency harmonics of the air-gap magnetic field caused by the current time harmonic is very prominent. Coupled with the high-speed mechanical friction loss on the surface of the rotor, the heat dissipation conditions of the rotor are limited, and the high iron loss and heat generated by the stator tooth tip due to local saturation and other reasons will also hinder the heat transfer from the rotor to the stator side, so the loss and heat generation of the rotor is extremely serious. , may cause high-temperature demagnetization of permanent magnet materials, reducing the reliability of the motor

[0004]The double-layer short-stack windings usually used in high-speed motors have physical contact between windings of different phases in the iron core slot and at the end of the winding, which increases the occurrence of phase-to-phase faults rate, and when a fault such as a short circuit occurs in a certain phase winding of the motor and the heat is severe, the normal phase winding in contact with it will be burned, which is not conducive to the realization of fault-tolerant operation and further threatens the reliability of the motor

In addition, when using stacked windings, the winding ends are very long, and it is difficult to cool the suspended winding ends, which further aggravates the heat generation of the motor and also brings high-speed rotor dynamics problems

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