Rotor punching sheet for outer rotor motor of household electric appliance fan

Abstract

The invention discloses a rotor punching sheet for an outer rotor motor of a household electric appliance fan, and the punching sheet comprises a punching sheet body, wherein the surface of the punching sheet body is provided with an inner circular hole and punching sheet slots. The periphery of the inner circular hole is uniformly provided with the punching sheet slots, and each punching sheet slot comprises a notch, a slot shoulder and a slot body, wherein the notch is a rectangular hole, the slot shoulder is a trapezoid hole, the slot shoulder is communicated with the notch and the slot body is a trapezoid hole. The inner circular hole is communicated with the slot shoulders through the slot bodies. The punching sheet employs a flat bottom groove shape, increases the area of the punching sheet slots, improves the quality of aluminium casting of a rotor, and achieves the effect of improving the noise. The flux density distribution of a tooth part of the motor rotor is enabled to be more reasonable, and the collocation of the flux density of the rotor punching sheet and a stator punching sheet is more reasonable. The motor efficiency is improved, and the loss of copper or aluminium is also reduced during the manufacturing of the motor, and the consumption of the raw materials of a winding and an iron core is reduced.

Description

technical field [0001] The invention belongs to the technical field of fixed tooling, and in particular relates to a rotor stamping based on an outer rotor motor of a fan of a household appliance. Background technique [0002] The stator stamping used for the outer rotor motor of the household appliance fan generally includes a substantially circular stamping body, a hollow inner hole is formed in the middle of the stamping body, and a hollow hole is formed between the outer circle and the hollow of the stamping body. Several punching slots extending radially are evenly distributed between the inner circular holes. The outer diameter of the punching body of the traditional stator punching is generally 95mm, and the diameter of the hollow inner hole is generally 68 or 72mm. After magnetic circuit analysis and calculation, this stator punching structure has the following disadvantages: 1. The bottom of the rotor slot The size is small, the transition fillet is sharp, and the ...

AI Technical Summary

Problems solved by technology

The outer diameter of the punching body of the traditional stator punching is generally 95mm, and the diameter of the hollow inner hole is generally 68 or 72mm. After magnetic circuit analysis and calculation, this stator punching structure has the following disadvantages: 1. The bottom of the rotor slot The size is small, the transition fillet is sharp, and the quality of cast aluminum is poor, resulting in a small starting torque of the motor, which affects the performance and noise of the motor; The magnetic density of the stator yoke is relatively high and the magnetic density of the stator yoke is relatively low, which affects the efficiency of the motor and electromagnetic noise; 3. The large magnetic density of the air gap affects the electromagnetic noise

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