Differences between common motor mounting methods B3, B5, and B35 in pumps

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As a common driving device for water pumps, motors are frequently a source of confusion for customers when it comes to deciding on the most suitable installation method. Today, we will clarify this issue for you. The common installation methods for motors are B3, B5, and B35. So 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, has flanges but no feet. These refer to motors with flange mounting, which is what is commonly known as vertical installation. V1 and V3 are variations of the B5 mounting style: V1 has its shaft extending downward, while V3 has its shaft extending upward. Both B5, V1, and V3 use FF flange mounting, but B5 features horizontal flange mounting (with the shaft horizontal), V1 uses vertical flange mounting (with the shaft head pointing downward), and V3 uses flange mounting 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. B3 installation, actual image of ABB motor; B35 installation, actual image of ABB motor; B5 installation, actual image of Marelli Motori motor