How important is motor grounding
Grounding is a crucial safety protection requirement for motor products, both for the motor and for operators and supporting equipment; Hengli Motor GB14711 and GB755 are two crucial standards for motor products. The standards provide specific requirements for grounding, but many motor manufacturers may mishandle the grounding process due to cognitive or other factors. Hengli Motors has strict processes for controlling the selection of suppliers and production processes.
According to production standards, Hengli motors must have protective grounding devices that comply with regulations. There should be a permanent, reliable, and good electrical connection between the motor base and the protective grounding device. When the motor moves on the equipment base, the protective grounding conductor should still be reliably connected.
In actual production and operation, for most motor products, only the grounding mark and grounding screw are left on the motor body, and the grounding wire is provided by the customer; For long lead motors, the grounding wire is mostly provided by the motor manufacturer. However, due to the cognitive issues between the supply and demand sides regarding the grounding wire, there are always some motors with arbitrary grounding parts, and many of them do not meet the requirements, whether it is the color or diameter of the grounding wire. In order to prevent safety issues, both the motor manufacturer and the user should strictly follow the regulations.
Basic requirements for motor grounding protection
The motor must have a protective grounding device that complies with regulations. There should be a permanent, reliable, and good electrical connection between the motor base and the protective grounding device. When the motor moves on the equipment base, the protective grounding conductor should still be reliably connected.
If the motor is connected to the grounding wire using a terminal block, the terminal block should meet specific requirements. The connection of the protective grounding terminal block should be reliably locked to prevent accidental rotation and reduce electrical clearance and creepage distance. It should not be loosened without tools.
The protective grounding terminal should not be used for other purposes besides serving as a protective grounding.
The materials of protective grounding conductors, protective grounding terminals, and their connection devices should be compatible, resistant to electrical corrosion, and be good electrical conductors. If black metal is used, electroplating or other effective measures should be taken to prevent rusting.
The protective grounding conductor should have sufficient toughness, be able to withstand motor vibration stress, and have appropriate protective measures to prevent danger during motor use and installation.
The protective grounding connection should be able to ensure that non-conductive coating layers such as paint are truly penetrated. The connection method can be cold crimping or other equivalent means, without the use of hinges and relying solely on soldering.
The grounding body penetrating the elastic rubber base should be metal and cannot be grounded with conductive rubber.
The resistance of the grounding path should not exceed 0.1 Ω.
