AC asynchronous motor with circumferential windings

Abstract

An AC asynchronous motor with circumferential windings includes three phases of stator magnetic cores (145, 146 and 147), three phases of circumferential windings (167, 168 and 169), an a asynchronous motor rotor and accessories including a casing and a bearing. the three phases of stator magnetic cores are arranged axially phase by phase, and each phase of stator magnetic core comprises a cylindrical magnetic core, stator magnetic poles arranged in parallel with the axial direction of the cylindrical wall and magnetic circuit connectors; the magnetic poles form a circumferential range, a gap exists between the adjacent magnetic poles, one end of the magnetic pole and one end of the adjacent magnetic pole are connected to the two ends of the cylinder via the magnetic circuit connectors respectively, and the circumferential winding is embedded into an annular space between the magnetic poles and the inner cylindrical wall; and three phases of rotor magnetic cores are aligned and connected in series along the axial direction, busbars in the three phases of rotor slotways share short-circuit rings at the two ends, under the three-phase AC of the three-phase circumferential windings, induction currents of the busbars of the rotors bear a force in a mixed manner, self-startup operation is realized, and loss and end-portion loss of traditional windings are avoided. Thus, the AC asynchronous motor has the advantages including little magnetic flux leakage, simple structure, reduced copper material, less heating, high efficiency and reliability and energy-saving performance.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to an AC asynchronous motor with circumferential windings. Background technique [0002] A motor is a conversion device between mechanical energy and electrical energy, including motors and generators. Among them, the AC asynchronous motor in the prior art generally adopts a winding structure in which the stator is axially slotted and wired. This kind of motor uses the alternating magnetic field generated by the stator winding on the stator core to induce an asynchronous induced current in the rotor. The asynchronously induced current drives the rotor to rotate in the stator magnetic field; or the stator winding induces an asynchronously induced voltage through the change of the magnetic field between the stator and the rotor, and is used as an AC asynchronous generator. [0003] Regardless of whether it is a motor or a generator, the straight conductor part of the stator winding in...

AI Technical Summary

Problems solved by technology

[0005] 1. There are more flux leakage at the end, the utilization rate of the magnetic field is reduced, and the power and efficiency of the motor are affected;

[0006] 2. The magnetic flux leakage at the end leads to large eddy current loss in the magnetic components such as the end cover near the end, and the temperature rise of the end cover and nearby metal devices is high. On some specific motors, measures to cool the end cover have to be taken, which increases the Cost and failure rate, shortening the service life of the motor;

[0007] 3. At the same time, the end produces resistive power consumption and generates heat, which increases the copper loss of the winding, increases the temperature, and wastes energy;

[0008] 4. The existence of the end makes the length of the winding longer and the amount of electromagnetic wire is larger, which increases the copper material and cost requirements;

[0009] 5. The existence of the end also increases the size and weight of the motor;

[0010] 6. The structure of the magnetic core groove in the prior art makes the processing technology of the stator magnetic core more complicated, the winding embedding is more difficult, the special equipment for embedding the wire is expensive, the process is more complicated, and the production cost increases;

[0011] 7. In order to improve the slot full rate, the insulating paper or the insulating varnish layer used in the magnetic core is relatively thin, which is more prone to breakdown, extrusion, and damage of the insulating layer, resulting in ground leakage problems;

[0012] 8. Most of the general windings have an approximately elliptical structure, and the most effective straight conductor part is often bent, dislocated or cross-layer extrusion due to assembly process problems after being embedded in the slot. Similarly, cross-layer extrusion is also prone to occur at the end Phenomenon, which reduces the reliability of the insulation, is more prone to turn-to-turn, phase-to-phase short circuit or leakage, and increases the failure rate of the motor;

[0013] Another important aspect is that at present, the motors used in new energy electric vehicles include: AC motors, permanent magnet motors, switched reluctance motors, etc. Generally, these motors still use the traditional motor structure with end windings. The above shortcomings of the motor make the development of electric vehicles subject to the constraints of the motor technology to a large extent; how to improve the efficiency of the motor The problem of power and power has become a key technical bottleneck restricting the development of electric vehicles. Therefore, it is urgent to develop new motors with high efficiency, energy saving and high reliability.

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