Differences between vertical and horizontal motor tests

The most significant difference between vertical motors and horizontal motors is the different installation methods, followed by the different structural design schemes derived from this. Under normal circumstances, the basic series motors with a center height of 225 and below are generally only installed in different ways when used. As long as the installation interface matches, they can operate normally. When the frame size is larger, or the motor bearings and housing are not sufficient to bear the specified or actual external forces applied during operation, the structural design scheme will be greatly different. For example: use bearings or bearing assemblies that can bear large axial forces, increase the strength of the housing, design special end covers, bearing covers, etc.

In addition to the above-mentioned installation interface forms, and the necessary adjustments to the structure and support methods of rotating parts, there are also large differences in motor tests. Especially for large vertical motors, not only the necessary tooling must be designed, but sometimes some other auxiliary measures and relatively accurate equivalent test methods must be taken. Inspection tests do not require two motors to be tested in a shaft connection, and it is only necessary to consider that the bearings will not be damaged when the motor rotates. However, during type tests, necessary tooling must be considered. Some equivalent tests such as the overlapping frequency method will be used during the test. The equivalent test method will naturally have some deviations, but in most cases, the deviations caused by this are usually acceptable. A few demanding customers will obviously not tolerate such deviations. For example, motor manufacturers use horizontal structures to evaluate the performance of vertical motors, and some users simply do not accept type tests that change the original structure of the motor.

A vertical motor is a motor whose output shaft axis is perpendicular to the chassis or the transmission mechanism. Its outstanding feature is that the mounting holes are equidistantly distributed around the output shaft. The vertical motor is arranged vertically on the driven machine, and the motor shaft also drives the machine vertically. It is widely used in industrial production, such as vertical water pumps, vertical lathes, etc.

The vertical motor model is composed of product code and specification code in sequence according to GB4831. The product code is represented by the motor series code, such as:

YL indicates a three-phase vertical Asynchronous Motor with a squirrel cage rotor that does not bear axial force; YLST indicates a three-phase vertical asynchronous motor with a squirrel cage rotor that bears axial thrust; YKKL indicates a three-phase vertical asynchronous motor with a fully enclosed squirrel cage rotor with an air-to-air cooler; and YKSL indicates a three-phase vertical asynchronous motor with a fully enclosed squirrel cage rotor with an air-to-water cooler. Vertical motors mostly adopt the internationally popular box-type structure. The square base is made of welded steel plates, which has the advantages of good rigidity and light weight. By changing the covers or air (water)-to-air coolers on both sides of the base, different series of motors can be formed. Most stators adopt an external pressure-mounted structure, and their stator windings use F-class edge materials and anti-corona materials. The winding ends are fixed with a special binding process, which is firm and reliable. The entire stator is treated with a vacuum pressure process of vacuum pressure impregnation with F-class solvent-free paint. The motor has excellent and reliable insulation performance and moisture and impact resistance.

The rotor adopts cast aluminum rotor or copper bar rotor structure according to the size of the motor rotor. No matter which structure of the rotor is adopted, its structure and manufacturing process can ensure the reliable operation of the motor. According to whether the motor bears axial force or the size of the axial force, the upper bearing structure of the motor has two types: rolling bearing or sliding bearing, and the lower bearing structure is rolling bearing. The motor with rolling bearing structure has non-stop grease filling and draining device. The main outlet box is a sealed structure with a protection level of IP54. The wire entry hole of the outlet box can be switched up, down, left and right, and there is a separate grounding terminal in the box.