Stepping motor , coupling device between housing and mounting plate, and method for installation

Abstract

This invention discloses a stepper motor, and the connecting device and installation method of its shell and the installation plate. The permanent magnet claw-type stepper motor includes the shell with the bearing, the stator, the rotor, and the installation plate with the bearing, in which, the stator is inserted in the shell, whose output terminal toward outside, and the short axis of the rotoris inserted in the bearing hole of the shell, and the bearing hole of the installation plate covers the long axis of the rotor, the shell terminal close to the port fixed on the installation plate, and the said shell terminal close to the port has the positioning standing, and the installation plate has the clip standing to locate in the positioning standing. In this invention, the clip standing of the installation plate can locate and clip on the positioning standing of the shell, and through positioning of the part itself, the positioning is accurate, and no need for special fixture, so it effectively reduces the fixture costs and maintenance costs, but also saves the device cost; the whole motor structure is compact, the positioning precision high, the assembly method simple, the cost low; in the motor assembly process, no need point melting, so there is no spark ball to make the motor stop operation.

Description

Technical field [0001] The invention relates to a stepping motor and its casing and mounting plate coupling device and installation method thereof, in particular to a permanent magnet claw-type stepping motor and its casing and mounting plate coupling device and installation method thereof. Background technique [0002] The permanent magnet claw-type stepper motor seen on the market is generally composed of a mounting plate, a front bearing, a casing (sub-front casing, a rear casing), a rear cover, a rear bearing, a coil, a stator, a rotor and other parts. Point welding is used between the mounting plate and the front shell on the exterior, and between the rear cover and the rear shell; while the riveting method is used between the front bearing and the mounting plate, and between the rear bearing and the rear cover. [0003] Among them, since the riveted finished product of the mounting plate and the front bearing and the front housing need to be fixed together by spot weld...

AI Technical Summary

Problems solved by technology

[0003] Among them, since the riveted finished product of the mounting plate and the front bearing and the front housing need to be fixed together by spot welding, complex positioning and welding fixtures are required

Since the center hole of the bearing and the inner and outer diameters of the housing need to ensure a high coaxiality (to prevent the rotation performance of the motor from deteriorating), it is necessary to keep a small gap between the fixture and the housing, which affects the workability

And because the fixture is easy to wear, the bad phenomenon of coaxiality reduction often occurs

In addition, to realize the installation of these parts, two spot welding machines are required. The spot welding machine is not only expensive equipment, but also easily produces spark balls during welding. If these spark balls are missed, they will move between the rotor and the stator. , it will cause fatal motor non-rotation phenomenon

In addition, the strength of point welding is not easy to guarantee, and there are often market complaints that the mounting plate falls off, which is also a fatal defect.

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