Light power three-phase motor

Abstract

The invention relates to a low power three phase motor. Wherein, the stator has a star winding and a triangle winding; the phase bands of said two windings are alternatively distributed while the electrical angle distance of central space of nearby phase bands is ªð / 6; the invention is characterized in that: the stator has 4 electrodes and 24 grooves while it is consequent pole single-phase winding, the edge of star winding and the edge of triangle winding individually takes up 12 grooves while said two windings are alternatively distributed along the grooves; the number of turn of triangle winding is the 1.73 times of the number of turn of star winding while its wire diameter is the 0.76 times of the wire diameter of star winding; according to the phase sequence, the initial terminal of each phase of star winding is connected to the power source and every linear terminal of triangle winding is connected to the end terminal of relative phase of star winding or the initial terminal of each phase of star winding and every linear terminal of triangle winding are connected to the power source while the end terminals of each phase of star winding are connected each other. Compared to the present technique, the invention can improve the coefficient of winding and weaken higher harmonic to improve the property, reduce the cost, improve the start property and reduce the electromagnetic vibration noise.

Description

technical field [0001] The invention relates to a low-power three-phase motor, which belongs to H02K3 / 28 in the international patent classification table. Background technique [0002] In order to overcome the shortcomings of the traditional three-phase winding motor with only star or delta connection, the existing technology proposes a scheme of using star and delta mixed winding in the three-phase motor, which can improve the winding coefficient and eliminate high-order harmonics. Obvious effect. It can be seen from the article "Delta-star-series and parallel connection method of three-phase windings" published in the fifth issue of "Small and Medium-sized Motors" in 1978. The star-shaped and delta mixed windings of the prior art can be found in the Chinese invention patent application publication CN1378325 "Wiring Method for Stator Windings of Multifunctional Motors" and Chinese utility model patent specification CN2266220Y "Pumping Motor" and so on. The wiring of its w...

AI Technical Summary

Problems solved by technology

The wiring of its windings is mostly aimed at the situation with a large number of slots and the use of double-layer windings, which is more suitable for small and medium-sized motors with high power. For low-power motors with small diameters, the process is difficult.

Low-power three-phase motors with fewer slots still mostly use only star or delta three-phase windings, so the harmonics higher than the third cannot be effectively eliminated, and it is difficult to further improve the starting performance and reduce electromagnetic vibration noise; and the winding coefficient Difficult to increase further to improve motor efficiency or reduce cost

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