During motor operation, vibration can cause varying degrees of loosening in otherwise robust components. To ensure motor operational reliability and minimize or eliminate such loosening to the greatest extent, necessary measures are implemented during motor manufacturing—using elastic washers being a very common example.

　　Regarding the rotor assembly, reinforcing relevant rotor components is especially critical due to the rotor’s unique rotational behavior during motor operation.

　　During rotor dynamic balancing, the riveted joint between the balancing pin and the balancing weight is an extremely critical step.This step is prone to balancing weight detachment if improperly executed—a relatively concentrated issue; another concern involves internal fan balancing measures for large-motor rotors. Some motor manufacturers use screws and nuts as counterweight balancing elements but fail to implement necessary re-reinforcement measures, representing a significant quality risk; for any other rotor-mounted fixings, essential anti-loosening measures—such as adding welded reinforcement bars onto the original structure—are mandatory.

　　Welding and riveting used in motor manufacturing

Welding—also termed fusion welding or simply welding—is a manufacturing process and technique that joins metals or other thermoplastic materials (e.g., plastics) via heating, high temperature, or pressure. Modern welding employs diverse energy sources, including gas flames, electric arcs, lasers, electron beams, friction, and ultrasonic waves. Beyond factory settings, welding can be performed in various environments—outdoors, underwater, and even in space. Regardless of location, welding poses hazards to operators, necessitating appropriate protective measures. Potential human health risks include burns, electric shock, visual impairment, inhalation of toxic fumes, and excessive ultraviolet radiation exposure. In motor manufacturing, welding technology is widely applied in numerous stages, such as winding connections and steel plate component fabrication.

Riveting—i.e., rivet joining—is a mechanical term describing a method whereby the shank of a rivet inserted into holes drilled through two or more parts is deformed axially to form a head, thereby securing the parts together. Generally, riveting refers to drilling holes in two plates or components, inserting rivets, and then using a rivet gun to join them.

For dynamic balancing of SIMO cast-aluminum rotors, riveting technology is employed, with the cast-aluminum rotor’s balancing pins acting as rivets. The rivet gun is a key factor influencing fixation effectiveness during riveting—a topic to be elaborated in subsequent articles.