A wheel hub motor for an electric vehicle

Abstract

A hub motor for an electric vehicle, comprising an end cover, a rim and a permanent magnet, the end cover is located on both axial sides of the rim and the permanent magnet, the rim includes a groove structure, and the groove structure includes The bottom wall of the groove and the side wall of the groove, the depth of the groove structure is not less than 7mm, the angle between the side wall of the groove on at least one side and the bottom wall of the groove is between 90 and 96 degrees, and the The sum of the included angles between the side wall of the groove and the radial direction is 0-22±6 degrees, and the ratio of the width of the bottom wall of the groove to the nominal width of the rim is 0.45-0.82. Compared with the prior art, the in-wheel motor for electric vehicles provided by the present invention has the following advantages: uniform and reasonable configuration of the magnetic circuit density on the magnetic surface, avoiding rotor movement, the rotor magnetic circuit density will not be blocked or weakened, and the Low power consumption, light overall weight, easy installation of auxiliary structural components, high stability.

Description

technical field [0001] The invention relates to the field of in-wheel motors, in particular to an in-wheel motor for electric vehicles. Background technique [0002] As a convenient and economical means of transportation, electric vehicles are widely used in people's daily transportation. With the improvement of people's awareness of environmental protection, especially the introduction of the new national standard for electric bicycles in the "Technical Specification for Safety of Electric Bicycles" (GB17761-2018), the new national standard stipulates that the mass of the vehicle (including battery) does not exceed 55Kg, Therefore, higher requirements are placed on the lightweight of electric in-wheel motors. To this end, many manufacturers have begun to invest in the research and development of in-wheel motors with low overall weight, low tire rolling resistance, and in order to increase the driving force arm of the in-wheel motor and make the outer diameter of the stator...

AI Technical Summary

Problems solved by technology

However, the technical solution described in this application for invention does not disclose any technical content to stretch the rim width as far as possible and maintain the rim width within a specific range, so as to ensure the existence of a reasonably distributed rotor magnetic circuit density. After the magnetic steel sheet is laid on the inner side of the rim, it is still unavoidable that the actual width between the two ends of the rim is too narrow and the span range is too large to avoid the problem of uneven magnetic circuit density at the magnetic force surface, which eventually leads to rotor movement The phenomenon is serious, the stability of the hub motor is poor, and the energy consumption is large

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