A structure of AC asynchronous motor

Abstract

The invention discloses an AC asynchronous motor structure, the number of stator slots is 72 slots, the number of rotor slots is 56 or 58 slots, both are 6 poles or 8 poles; the width of the bottom of the stator slot is 5‑10 mm, and the width of the top of the slot is 7 ‑13mm, slot depth 22‑38mm, slot width 2‑4mm, slot depth 0.8‑1.5mm; rotor slot bottom width 5.5‑10.5mm, slot top width b2 is 3‑7mm, slot depth 20‑40mm, slot The mouth width is 0.8-1.5mm, the slot depth is 0.8-1.5mm; the stator and rotor slot angles are both 20°-30°; the outer diameter of the stator is 400-520mm, the inner diameter is 285-375mm; the inner diameter of the rotor is 85-230mm, The outer diameter is 283‑374mm. The rotor and the shaft are connected by a cast aluminum bracket. The invention aims to provide a novel rotor and stator structure, which improves the efficiency of the motor and greatly reduces the volume and weight of the motor.

Description

technical field [0001] The invention relates to the field of motor structure, in particular to an AC asynchronous motor structure with optimized groove type, structure and size. Background technique [0002] The slot structure of traditional AC asynchronous motors is usually designed as a narrow and deep slot structure to increase the slot leakage reactance of the rotor, reduce the starting current and improve the starting performance. The rotor usually has a slot slope of one or more stator pitches to reduce harmonic torque and reduce the adverse effect of harmonic torque on starting. The above design well satisfies the requirements of motor starting performance under power frequency working conditions. However, the cast aluminum rotor chute will produce chute leakage reactance, and the narrow and deep slot structure usually has a larger slot leakage reactance, which virtually increases the value of the total leakage reactance. A large leakage reactance will reduce the to...

AI Technical Summary

Problems solved by technology

However, the cast aluminum rotor chute will produce chute leakage reactance, and the narrow and deep slot structure usually has a larger slot leakage reactance, which virtually increases the value of the total leakage reactance

The larger leakage reactance will reduce the torque performance of the motor at high speed, and pure electric vehicles and hybrid vehicles usually require the motor to have a certain torque at high speed, and the rotor and the shaft are usually directly connected, because the rotor The production material is usually silicon steel sheet, which has a high density, which makes the weight of the motor heavy; and because the traditional motor needs to meet the performance requirements of high power, the motor is bulky and the body is heavy.

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