YS7122 Three-Phase Asynchronous Motor

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Brief Introduction of Main Components of the Motor

The structural design of the YS7122 three-phase asynchronous motor makes it a versatile power equipment suitable for various environmental conditions. This type of motor is supported by general components and various special parts with different characteristics. The main components of the motor include: base, stator, rotor, bearing, junction box, etc. These assembly parts are basically general components, and the only differences are the length of the base and the size of the bearing. The ventilation cover is a non-general component, which can be redesigned according to user requirements, such as control of noise, different protection levels, different ventilation methods, etc.
Base and Stator: The base is a rigid box welded from multiple steel plates. The stator core is laminated from mutually insulated cold-rolled silicon steel sheets. At both ends and the back of the core, steel pressure plates and rib plates fix it in the middle, forming an integrated stator core assembly with ventilation ducts. The prefabricated stator coil windings are placed in the core slots. The ends of the coil windings are firmly fixed together with end hoops and binding ropes respectively, and undergo vacuum pressure impregnation treatment to withstand the strong electromagnetic force impact generated during motor startup or under certain accidents. Generally, there are three stator lead wires; according to user requirements, there can also be four or six lead wires. The lead wires are marked in the main junction box, with the main lead wires marked as U, V, or U1, V1, W1; the neutral point lead wire is marked as N or U2, V2, W2.
Rotor: The rotor consists of a rotor core, a transmission shaft with radial rib plates, and a rotor winding. The core has ventilation ducts, which are formed by laminating mutually insulated cold-rolled silicon steel sheets, and end plates with high rigidity are used to fasten them together under the winding to form an integrated structure.
Cage rotor windings are available in two types: cast aluminum and copper bars. Both are firmly fixed in the rotor core slots. The conductor bars and end rings of the cast aluminum rotor are cast as one piece; the copper bars and end rings are connected by intermediate frequency induction welding, using silver-copper alloy welding rods that fill the gaps between the copper bars and end rings.
Wound rotor windings are made of rectangular copper strips wrapped with insulation. The windings are firmly fixed in the core slots, and the ends of the windings are bound with non-magnetic tapes to prevent damage to the winding ends during operation or accidental overspeed. A rotor slip ring device is set at the non-shaft extension end, which is connected to an external starting resistor through the brushes on the brush holder and the rotor junction box.
Motor Ventilation

The YS7122 three-phase asynchronous motor is equipped with a self-sufficient ventilation device, regardless of whether there is a ventilation cover or the form of the ventilation cover. Usually, the cooling of the motor enters from the sides of the two ends of the base or from the two end faces of the ventilation cover. Part of the air is forced by the fan into the ends of the stator windings and then discharged to the back of the stator core. Another part of the air enters the radial ventilation duct of the rotor through the air duct between the rotor core and the shaft, reaches the air gap, and then passes through the ventilation duct of the stator core to be discharged from the back of the stator core. The air discharged from these two parts mixes and is discharged to the external atmosphere from the exhaust ports in the middle of both sides of the base or the exhaust ports on both sides of the ventilation cover. The specific situation may vary slightly depending on the different cooling methods of the motor.
Motor Installation
Before leaving the factory, the JW7122 three-phase asynchronous motor undergoes electrical and mechanical tests, and only after obtaining a certificate of conformity is it packaged and shipped. Random documents are included in the packaging; for wound rotor motors, spare parts are also provided for users to replace. If any accidental damage to the motor is found after arrival, the transportation department and the nearest sales service manager of Lanzhou Lanzhou Electric Motor Co., Ltd. shall be notified, and a representative shall be requested to participate in the joint unpacking inspection. If accidental damage is found, contact the transportation department immediately, and further inspection must be carried out before installation.
Under normal circumstances, there are four lifting lugs on the motor base, through which the entire motor can be lifted for hoisting.
If steel wire ropes are not used as support materials, the horizontal angle of the steel wire ropes should be greater than 60 degrees. It is strictly forbidden to use other methods without using the lifting lugs.

If the YS7122 three-phase asynchronous motor cannot be installed in time, it should be placed in a dry and clean warehouse. The storage environment is very unfavorable if there are suspended solid particles such as dust, corrosive gases such as acids, bases or salt spray, excessively high or low temperature, excessive humidity or drastic changes in humidity. It is best not to cover the motor with plastic cloth for a long time; a waterproof canvas cover can be used to prevent dust from entering. If the motor is equipped with a heater, to prevent condensation and moisture inhalation, the heater can be powered on. In addition, several 100W or 150W bulbs can also be powered on inside the motor casing. When the storage time is too long, the insulation resistance should be measured regularly. The minimum storage temperature is 5 degrees Celsius.
Work Procedures Before Installation
The installation of the motor requires strict procedures, because the performance of the motor largely depends on its adjustment and the stability of the foundation. Therefore, before installing the motor, the following points must be checked to prevent failures during operation.
Appearance and Mechanical Inspection: If there is any damage or doubt about the motor, a report should be submitted immediately.
Determine the center point of the foundation to establish the center line of the unit and the elevation of the foundation surface.
Check the correct positions of the anchor bolts, cables, wires, pipelines, busbars, air ducts, etc. against the outline drawing, and whether their sizes are appropriate, so as to correctly install the motor and its accessories.
Check whether the size, position and top height of the anchor bolts are correct according to the outline drawing.
Make some flat or wedge-shaped shims. When installing the YS7122 three-phase asynchronous motor on the foundation, use these shims to pad it up to prevent the motor from tilting and facilitate level adjustment.