Motor casing

Abstract

A rear casing (inner casing) 50 that fits into a front casing (outer casing) 40, where a stator 20 is held between these casings 40 and 50. The front casing 40 and the casing [SIC] 50 are rigidly adhered to each other through caulking, adhesives, or welding. Furthermore, the elastic parts 46 that provide an elastic force on the stator 20 towards the rear casing 50 at the step part 43 of the front casing 40, where the stator 20 is press fitted, and the restorative force of the elastic pieces 46 strongly holds the stator 20.

Description

technical field [0001] The present invention relates to motors, such as stepper motors, and structures for fastening a stator to a housing. Background technique [0002] Hybrid stepper motors, for example, are often constructed in such a way that a stator with coils wound around an annular stator lamination is located in a small air gap around a rotor with magnets attached to the rotor lamination, which is made of thin Laminations pressed by iron plates, similarly, rotor laminations are also laminations pressed by thin iron plates. In this type of stepper motor, when current is supplied to the coils, the poles of the rotor are connected to the poles of the stator, causing the rotor to remain in a specific position, where by changing the phase of the current supplied to the coils, the rotor gradually rotate. [0003] Generally, motors, including the above-mentioned stepping motors, have a protective case that accommodates a rotor and a stator, wherein a shaft serving as an ...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned motors disclosed in the publications listed above are complex in connection operation, where the connection operation means that the two casing sections are bolted together, while the stator is held between the stator insertions of the two casing sections state, and at the same time such motors tend to increase the number of parts

Also, there is the problem of a large number of manufacturing steps because of the steps required to make the bolt holes and threaded holes for bolting the individual shell segments together

Also, metal particles generated when the unit is fastened by turning the bolts can enter the small air gap between the rotor and the switch, causing problems in turning

These problems tend to reduce production efficiency, so there is a need to develop technologies that can solve these problems

Also, in constructions where the parts are bolted together, there is a risk that the bolts will loosen over long periods of operation, tending to cause rattling sounds and swinging where the stator is held

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