(1) Large and medium-sized motors need to be customized
Different from the standardized design and production process of micro and special motors, small power motors and small motors, large and medium-sized motors need to be in accordance with the rated power, speed, voltage, bearing form, cooling method, protection level, torque characteristics, overload capacity, and Dozens of parameters such as load characteristics, power grid conditions (power characteristics), use environment, and center height are designed and manufactured.At the same time, on this basis, experienced technical research and development personnel are required to tailor the motor to a series of factors such as reliability and safety according to the location of the motor and the characteristics of the industry.
(2) The structure and manufacturing process of large and medium-sized motors are complex
The structure of large and medium-sized motors is related to its category, purpose, speed, protection type, ventilation cooling method and installation type. It is generally composed of multiple complex structural components, and the geometrical shapes of the structural components are various.
The complex structure of large and medium-sized motors determines the complex manufacturing process and numerous procedures.Large and medium-sized motors generally need to go through metal processing processes such as cutting, welding, heat treatment, and spraying; metal processing processes such as turning, pliers, planing, milling, boring, grinding, drilling, and inserting; stamping, shearing, riveting, and spot welding , Press-fitting and other stamping processing process links; winding, drawing, wrapping, wire embedding, joints and other electrical processing process links; vacuum pressure impregnation (VPI), winding anti-corona, coating and other insulation and chemical process links; Each of the inspection links such as balancing, assembly, and testing needs to be equipped with special processing equipment and experienced senior technicians.
(3) High inspection requirements for large and medium-sized motors
Large and medium-sized motors often need to go through complicated inspection procedures before they leave the factory to ensure product safety and reliability.The unit price of large and medium-sized motors is relatively high, and end customers rarely purchase spare motors, but the safety and reliability of the motor directly affect the safety and reliability of the entire production system, so the end customers have extremely high requirements for the comprehensive quality of large and medium-sized motors.The production process and a series of inspection procedures before leaving the factory can ensure the quality and performance of the motor to the greatest extent. Therefore, the manufacturers of large and medium-sized motors have very strict requirements for the testing of their production processes, which generally include raw material testing (including chemical composition and mechanical performance testing). , Flaw detection inspection, insulation dielectric strength inspection, etc.), component structure size and shape tolerance inspection, semi-finished product inspection, finished product factory test or type test and many other tests.
(4) Customers have high requirements for the reliability and after-sales service of large and medium-sized motor products
Under normal circumstances, the design service life of large and medium-sized motors is 20 years, and the design service life of large and medium-sized generators is 30 years.Large and medium-sized motors generally need to be overhauled once every 1 to 2 years. In some special cases, some motors have an overhaul period of more than 4 years, or even 10 years.Large and medium-sized motors often need to maintain stable and uninterrupted operation during the operation cycle, and can only be stopped for related inspection and maintenance until the end of the maintenance cycle.
Long-term operation will cause wear, corrosion and deformation of components.Due to the high value of single-machine large and medium-sized motors, users often do not reserve spare motors to replace faulty motors, so when the motor fails, it will inevitably cause the end customer's system to reduce production or shut down.Therefore, the product quality and after-sales service capabilities of large and medium-sized motor manufacturers, and the rapid repair capabilities in the event of accidental failures, have become one of the main basis for customers to choose products.Customers have put forward high requirements for the reliability and after-sales service level of large and medium-sized motor products.
