What do the common motor mounting methods B3, B5, and B35 mean? Must know when choosing a pump!

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As a common driving device for water pumps, motors are often a source of confusion for customers when it comes to deciding on the most suitable installation method. In his daily consultations with clients, Richter frequently encounters such issues, and today the editor will help clarify them for everyone. The common installation methods for motors are B3, B5, and B35. What do they mean? The standard Y-series three-phase asynchronous motors come in three frame sizes: B3, B5, and B35; these represent the most common installation methods for standard three-phase asynchronous motors. 1. B3 has a base and no direct mounting flange. 2. B5 has no base but has a direct mounting flange. 3. B35 has a base and a direct mounting flange. There are many ways to install motors, which are mainly divided into horizontal and vertical types. Within the horizontal type, it is further divided into B3, B35, B34, B5, B6, B7, B8, B9, B10, B14, B15, B20, B30 ； The vertical types are divided into V1, V15, V2, V3, V36, V4, V5, V6, V8, V9, V10, V14, V16, V18, V19, V21, V30, V31 ； But in actual production, the most commonly used installation methods are B3 (usually horizontal), B5 (with flanges but no feet), and B35 (with feet and flanges). B3 and B35 are designed for horizontal installation. The main difference is that B3 is a standard horizontal type, while B35 has feet and flanges. B5, on the other hand, refers to motors with flanges but no feet; these are motors designed for vertical installation. V1 and V3 are variations of the B5 installation style: V1 has its shaft extending downward, whereas V3 has its shaft extending upward. All of B5, V1, and V3 fall under the FF flange installation category; however, B5 uses a horizontal flange installation (with the shaft horizontal), V1 uses a vertical flange installation (with the shaft head pointing downward), and V3 uses a flange installation with the shaft head pointing upward. Generally speaking, V1 and V3 may have bearing stress issues. But better motor manufacturers can design them to be replaceable.