I. Overview
The YL series vertical three-phase asynchronous motors represent an optimized product line developed by our company. This development was based on the assimilation of design and manufacturing technology from Westinghouse Company (USA) and LDW Company (Germany). Drawing upon our extensive experience of over 70 years in designing and manufacturing high-voltage three-phase asynchronous motors, this series includes YLKK and YLKS subseries, catering to different cooling methods as per specific requirements.
These motors find versatile applications, particularly in driving vertically mounted pumps and other machinery. They are widely employed in power plants for circulating water pumps, condensate pumps, and various water conservancy pumping stations. The motors can be customized to bear axial thrust loads based on user preferences.
II. Advantages and Characteristics
1. The insulation class of this motor series is F grade, utilizing a top-tier domestic insulation system. High-quality mica tape and environmentally friendly impregnating resin paint are employed, the CNC winding machine, pulling machine, and wrapping machine are used to complete the coil production. The coils undergo VPI (vacuum pressure impregnation) treatment, resulting in low normal dielectric loss, low high-temperature dielectric loss, minimal leakage current for the entire machine, and a very low voltage drop rate during thermal aging. This ensures well-crafted coils with excellent and reliable insulation performance, robust mechanical strength, and high moisture resistance.
2. Leveraging advanced technology from both domestic and international sources, the company employs a "field and circuit" combination method for electromagnetic design. This enhances the accuracy of calculating electromagnetic properties, providing precise information on starting current, starting torque, and starting temperature rise. The goal is to ensure the development of high-efficiency and energy-saving motors. The structural design incorporates Finite Element Method (FEM) analysis, which, validated through practical applications, allows accurate application of boundary conditions to the established mechanical model. This addresses material use accuracy, controls motor vibration and noise, and employs finite element mechanical analysis for high-precision strength analysis of the seat and thrust bearing. This, in turn, enhances temperature rise calculation accuracy in motor design, reduces ventilation loss, and improves overall motor efficiency.
FACTORY PHOTOS
Raw Materials
Frame: Cast iron, steel
Stator: Copper
Rotor: Copper/aluminum
Shaft: 45# Steel
Bearing: SKF, or equivalent
In-process Inspection/ Quality Control
All the measuring apparatus and instruments are calibrated each year.
Quality control for each item
| Part |
Inspection item |
| Coil |
1. Physical and chemical tests for raw materials |
| 2. Coil winding process inspection |
| 3. Winding dimension inspection |
| Iron Core |
1. Physical and chemical test report for silicon steel sheet material |
| 2. Lamination burrs and paint film inspection |
| 3. Dimensional inspection of laminated steel sheet |
| Frame |
1.Cold welding parts conformity certificate |
| 2. Finish machining inspection |
| Rotor |
1. Rotor core lamination inspection |
| 2. Conducting bar welding |
| 3. Check the material, appearance, conductivity and size of the conducting bar end ring |
| 4. Check the fastening of the conducting bars in the slots |
| 5. Dimensional check, including iron core outer diameter |
| 6. Dynamic balance correction |
| Shaft |
1. Raw material , annealing check |
| 2 Finish machining check |
| Stator |
1. Iron core compactness check |
| 2. Check iron core length and section length |
| 3 Inserting winding check |
| 4. Iron consumption check |
| Assembly |
- Plain bearing size and surface quality check
|
| 2. Check the size of the air gap, the coincidence of the axial centerline of the stator and rotor core, the gap of inner fan and windshield |
| 3 Cleaning check inside the motor |
| 4 Shaft center height and installation size check |
| Test |
1. Routine test |
| 2. Type test |
Test Items
Each motor must be tested before leaving the factory. After the motor is qualified, the motor can be shipped out. Each motor will have a test report.
Routine test items
Winding three-phase DC resistance
Winding insulation resistance to ground
Winding withstand voltage test
No-load current
No-load power
No-load loss
Three-phase no-load current imbalance
Locked rotor current
Locked rotor torque
Maximum torque
Rotation direction
Vibration: horizontal, vertical, axial
Noise
Type test items
Full load input power
Full load current
Stator winding loss
Rotor winding loss
Iron loss
Mechanical loss
Other losses
Full-load slip ratio
Stator winding temperature rise
Bearing temperature
Thermal winding insulation resistance
Overload test
Full-load power factor
Efficiency
Paintings
Standard painting thickness: 120microns (40 micron priming paint and 80micron finish paint)
With professional painters, we can mix and paint any color according to your choice.
Packaging
Standard seaworthy package for export
Plywood package or wooden fumigation package
Suitable for long distance transportation by sea
Warranty Period
Standard warranty: 12 months after commissioning, or 18 months after delivery, whichever comes first.
If you would like to extend the warranty period, please contact us for details.
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