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 includes the following steps: S1, determining the unbalanced position of the rotor according to a dynamic balancing testing machine; S2, pressing the dynamic balancing block into the sleeve on the first shaft section of the motor shaft; S3, rotating the dynamic balance weight around the first shaft section to a position where the dynamic balance weight can balance the dynamic unbalance of the rotor; S4, turning the dynamic balance weight The balance weight is pressed onto the second shaft section of the motor shaft. Wherein, both the first shaft section and the second shaft section have interference with respect to the dynamic balance weight, and the interference of the first shaft section with respect to the dynamic balance weight is smaller than that of the second shaft The interference of the segment relative to the dynamic balance block. The rotor dynamic balancing method provided by the invention does not endanger the operation reliability of the motor during the process of correcting the dynamic unbalance of the rotor, and is simple and flexible in operation and easy to popularize.

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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