Shoulderless and brushless hub motor for electric bicycle

Abstract

The invention relates to a shoulderless and brushless hub motor for an electric bicycle, belonging to the technical field of a motor for a direct-current electric bicycle. The invention is characterized in that the mandrel of the motor is in a shoulderless structure; a clamp spring for a lugless shaft, which is butted and matched with the inner end of a clutch, is clamped on the mandrel; a conical hub with a conical open structure is sleeved on the mandrel; the conical hub is connected with a conical end cover to form a shell; the conical hub is in clearance fit with a built-in magnetic yoke assembly and is in transmission fit with a built-in three-planetary gear mechanism; a Hall speed measuring sensor is matched and arranged on a stator bracket; and a signal magnetic sheet is arranged at a position, which is opposite to the Hall speed measuring sensor, on the inner side of the conical end cover. The invention furthest has the advantages that the inner cavity space of the hub is increased through the shoulderless structure of the mandrel and the open structure of the conical hub, and a built-in speed measuring mechanism is adopted; and the hub motor provided by the invention has the characteristics of novel and reasonable structure, reliable efficacy, light weight, small volume, low cost and the like, is accurate in speed measurement, and is an ideal front-end driving device for the electric bicycle, thereby filling the blank of built-in electronic digital speed measurement of the hub motor at home.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a miniature shoulderless and brushless hub motor for electric bicycles. Background technique [0002] The brushless wheel drum motor commonly used in electric bicycles has a shoulder structure, that is, there are steps at both ends of the mandrel, and the diameter of the mandrel on both sides of the steps changes, and the middle section of the mandrel is slightly larger than the two ends; The motor using this mandrel structure has problems such as large volume, heavy weight, and high cost. In addition, the speedometer used in traditional electric bicycles is installed on the motor casing, and the simulated speed based on the data of current changes is not only unsightly, but also has poor accuracy and reliability. Contents of the invention [0003] The purpose of the present invention is to provide a shoulderless brushless hub motor for electric bicycles in which the shoulderle...

AI Technical Summary

Problems solved by technology

[0002]The brushless drum motors commonly used in electric bicycles have a shoulder structure, that is, there are steps at both ends of the mandrel, and the mandrels on both sides of the steps The diameter of the shaft changes, and the middle section of the mandrel is slightly larger than the two ends; the motor using this mandrel structure has problems such as large volume, heavy weight, and high cost

In addition, the speedometer used in traditional electric bicycles is installed in the motor casing, and the simulated speed based on the data of current changes is not only unsightly, but also has poor accuracy and reliability.

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