Rotor position sensing method of brushless motor of electric bicycle

A technology for the position of electric bicycles and rotors, which is applied in the direction of electromechanical devices, electric components, electrical components, etc., and can solve problems such as inconsistency with the actual position, inaccurate stator phase switching, and frustration
CN110620486AActive Publication Date: 2019-12-27CYCLING & HEALTH TECH IND R & D CENT
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CYCLING & HEALTH TECH IND R & D CENT
Publication Date
2019-12-27

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Abstract

The invention provides a rotor position sensing method of a brushless motor of an electric bicycle. The method comprises steps that the direct current is supplied to two phases of windings of a statorunit, when a to-be-fixed rotor unit is attracted by the magnetic force of a magnetic field excited by a stator unit coil to pivot till being fixed, a sensing module is utilized for obtaining the angle position of a sensing magnet, a pivoting angle theta of the angle position of the sensing magnet relative to the reference position is calculated, then, the number of magnetic poles of the rotor unit is inputted into the sensing module, the sensing module carries out operation according to the number of magnetic poles of the rotor unit and the pivoting angle theta, and lastly, a control unit receives operation data of the sensing module and controls a brushless motor according to the operation data and the real-time information, sensed by the sensing module, of the position of the sensing magnet.
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Description

technical field

[0001] The present invention relates to a sensing method of an electric bicycle, in particular to a rotor position sensing method of a brushless motor of the electric bicycle. Background technique

[0002] In recent years, due to the improvement of health and environmental awareness, mobile vehicles such as electric bicycles that are both sporty and do not emit exhaust gas have been loved by many people. Most of the current electric bicycles have motors installed on the bottom bracket or front and rear wheels. At the wheel shaft, the motor drives the chain or the wheel to reduce the user's physical burden. However, the quality of the motor will not only affect the conversion efficiency of power, but also affect the smoothness of riding, which has a very important position. .

[0003] Compared with traditional brushed motors, brushless motors have higher efficiency and torque density, and are therefore widely used in electric bicycles. In order to accurately ...

Claims

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