Electric power steering system, motor and rotor dynamic balancing method thereof

Abstract

The invention discloses an electric power steering system, a motor and a rotor dynamic balancing method thereof. The rotor dynamic balancing method comprises the following stepsofS1, determining the unbalanced position of a rotor according to a dynamic balancing machine; S2, pressing a dynamic balancing block onto a first shaft segment of a motor shaft in a sleeving mode; S3, rotating the dynamicbalancing block around the first shaft segment until the dynamic balancing block can balance the dynamic unbalanced position of the rotor; and S4, pressing the dynamic balancing block onto a second shaft segment of the motor shaft in the sleeving mode. The first shaft segment and the second shaft segment have magnitudes of interference relative to the dynamic balancing block, and the magnitude ofinterference of the first shaft segment relative to the dynamic balancing block is smaller than that of the second shaft segment relative to the dynamic balancing block. According to the rotor dynamicbalancing method provided by the invention, the operational reliability of the motor is not damaged in the process of amending dynamic unbalance of the rotor, and the method is simple, convenient andflexible to operate and easy to generalize.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an electric power steering system, a motor and a rotor dynamic balancing method thereof. Background technique [0002] At present, the electric power steering system (EPS) has been widely used in automobiles, and its core component is the motor. Its motor includes a motor shaft and a rotor fixed to the motor shaft. When working, the motor shaft and the rotor rotate together, usually at a speed of 1000r / min to 3000r / min, which belongs to the high-speed operation state. [0003] Due to uneven material density of the rotor, uneven processing, errors in the assembly process, dirt deposition, corrosion, and deformation caused by temperature changes during use, the center of gravity of the rotor deviates from the axis of the motor shaft, which is called The dynamic imbalance of the rotor. [0004] The dynamic imbalance of the rotor will generate a large centrifugal force during i...

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Problems solved by technology

[0007] But these two methods have disadvantages: the reliability of the first method is poor, once the dynamic balance mud fails and falls off, the motor will be stuck; while the second method may retain iron filings when removing materials, and the iron filings will be absorbed on magnets can easily lead to motor failure

[0008] The electric power steering system has high requirements on the reliability of the motor. Obviously, the above two methods cannot meet the reliability requirements of the electric power steering system. Correction of the balance, which will inevitably cause strong vibration and noise during the operation of the electric power steering system

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