Sharing the knowledge of the Y series three-phase asynchronous motor rotor balance column can not be underestimated!
The cast aluminum rotor is typically balanced dynamically by adding weights to correct any imbalance. A balance column is usually placed on the end ring of the rotor, and a dynamic balancer identifies the unbalanced spot. Then, a balancing pad is riveted onto the balance column at that location. Dalan Motor Xiaobian will provide a brief explanation to help you better understand the concept of the Y series three-phase asynchronous motor’s rotor balance column.
Cast Aluminum Rotor Balance Columns and Dynamic Balancing:
1. The balance column is generally designed with 8 evenly spaced points around the circumference, which limits the angular accuracy of the balancing process to about 45°. This relatively low precision has led many manufacturers to increase the number of balance columns in their designs, although they are still distributed uniformly.
2. The weight of the balancing pads used for adjustment is often constrained by the limitations of how much weight can be added without causing issues. Too heavy or too light can both lead to problems in the balancing process.
3. These two shortcomings together indicate that the dynamic balancing accuracy of such cast aluminum rotors is not sufficient to meet the growing demands of the high-precision and high-efficiency micro motor industry.
4. Some manufacturers have introduced multiple mounting grooves on the outer ends of the rotor's end rings, allowing for the attachment of balance weights. These grooves are radially arranged, with at least 8 grooves per ring, enabling precise radial and circumferential positioning during the balancing process.
Ultimately, reducing the initial imbalance after casting is a key goal in improving the cast aluminum process.
Balance Column Parameters and Rotor Quality:
The selection of the length and thickness of the balance column is crucial in the weighting method of balancing. These parameters directly affect the casting process and equipment used. Choosing the right dimensions can help avoid defects in the rotor and enhance its overall appearance.
1. During the casting process, the balance column serves as an exhaust channel. Its height, thickness, and other dimensions should be carefully considered based on the rotor size, groove shape, iron length, equipment pressure, and casting speed.
2. After casting, the balance column becomes the point where the rotor is balanced dynamically. It should not be too thin, as this could cause it to break due to insufficient strength, potentially leading to quality issues during motor operation.
3. If the balance column is too thin, it may hinder proper exhaust during casting, resulting in internal defects in the aluminum rotor. Thicker columns are generally preferable, as they help ensure a more stable and defect-free structure.
4. The diameter of the balance column and the inner diameter of the balancing pad should be closely matched to prevent the pad from falling off during motor operation.
Editor: Dalan Oil Pump Motor 02 - Procurement Consultant
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