Motor products are typical rotating machinery, and involves electrical energy, magnetic energy, wind energy, thermal energy, mechanical energy and other energy conversion relationship, the stator and rotor air gap on the motor of other performance indicators have a greater impact on the air gap is not uniform, the motor user's direct feeling of low-frequency electromagnetic sound, and in serious cases, because of the unilateral magnetic pull problem caused by the sweep of the quality of the problem.

We analyze the air gap non-uniformity of the motor from the perspective of machining today. In the previous article we talked about the motor stator part of the coaxial, rotor part, bearing system, additional device system of independent coaxial problem, but the coaxial requirements of the whole product must also be associated parts of the fit relationship to ensure.

Fitting relationship between rotating part and fixed part

The fitting relationship between the diameter of the seat and the end cap stop. From the analysis of the structure of the motor product, the bearing system and the rotor part can be attributed to the rotating part, the two are connected through the shaft, as a rotating whole with the stator part of the assembly and fixation, the stator part of the stator part of the rotating part of the key to fixation on the connection between the seat and the end cover, that is, the seat stops and the end cover stops with the matching relationship, in particular, to emphasize, when the two stops with the loosening of the fit, it will be very easy to cause the rotating part of the Axis and stator part of the axis of the unimportant, that is, the emergence of different axis problem, to other independent system compliance as a prerequisite, resulting in the result of the stator and rotor air gap is not uniform.

Positional tolerance requirements for the contact surfaces of the seat stop end face, end cap stop and seat end face. From the theoretical analysis, the two same direction of the mating surface should be coaxial, the two perpendicular direction of the mating surface should be perpendicular to the motor shaft centerline, in order to ensure that this requirement, in the seat and end cover processing process, the total length of the seat control is particularly unimportant, can not be horseshoe problem, the end cover stopping plane and the bearing inside the distance between the inner side of the chamber is also the key to quality control.

In the actual production process, due to the seat and end cap are thin-walled zero part, due to stress release or physical rotation and other issues, may lead to deformation of the stop, these issues will lead to the deterioration of the two with the relationship between the two, for this reason, in the control of parts machining process, including the design process of the parts should be guaranteed by technical means of the symmetry of the parts.

Comprehensive analysis of the above and the previous article for the independent part of the coaxiality control requirements, parts of the processing quality, especially in the machining process benchmark selection and processing control requirements, is to ensure that the motor product

Coaxiality requirements of the key, especially for high-efficiency motors, parts and components of the comprehensive level of processing, for motor efficiency to enhance the greater impact.

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