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B3 Mounted Electric Motors
B3 mounted electric motors are one of the most commonly used foot-mounted electric motor types in industry. In the B3 mounting type, the motor is fixed directly to the machine frame, steel platform, concrete floor or special motor base thanks to the foot mountings located on the body. This connection type is preferred in many industrial applications because it provides a secure, solid and easy mounting option especially in horizontally operating machines.
B3 foot-mounted electric motors are widely used in fans, pumps, compressors, conveyor systems, geared machines, crushers, screening machines, concrete batching plants, agricultural machines, feed machines, packaging machines, textile machines, woodworking machines and general machine manufacturing applications. Fixing the motor through its feet helps establish a more balanced connection between the machine and the motor. In coupled connections, belt-pulley systems and gearbox inputs, B3 mounted motors offer quite a practical solution.
What Should Be Considered When Selecting a B3 Mounted Electric Motor?
When selecting a B3 mounted electric motor, looking only at the motor power and speed is not sufficient. Especially if a new motor will be installed in place of an existing one, the body dimension, foot mounting spacing, shaft diameter, shaft length, key dimension and shaft height must definitely be checked.
Two motors with the same kW power can be manufactured in different body dimensions. For this reason, in motor replacements, the old motor's nameplate, body type and dimensions must be carefully examined. If the wrong body or wrong shaft dimension is selected, the motor may not fit the machine, the coupling alignment may be disrupted, the belt-pulley system may not work properly, or the connection holes may not match the existing frame.
The main dimensions to be considered in B3 mounted motors are as follows:
H dimension: The height of the motor shaft center from the foot base.
A dimension: The lateral distance between the foot mounting holes.
B dimension: The longitudinal distance between the foot mounting holes.
D dimension: The motor shaft diameter.
E dimension: The motor shaft extension length.
K dimension: The diameter of the foot mounting hole.
Key dimension: The dimension of the keyway on the shaft, and it is important for the pulley, coupling or gearbox connection.
Common Dimensions in B3 Mounted Electric Motors
The table below is a general reference for B3 foot-mounted electric motors commonly used in the Turkish market. Dimensions may vary according to the manufacturer, motor series, number of poles and special design. Verification must definitely be made with a technical drawing or catalog dimension before ordering.
| Body Type | H Shaft Height | A Foot Width | B Foot Length | D Shaft Diameter | E Shaft Length |
|---|---|---|---|---|---|
| 63 | 63 mm | 100 mm | 80 mm | 11 mm | 23 mm |
| 71 | 71 mm | 112 mm | 90 mm | 14 mm | 30 mm |
| 80 | 80 mm | 125 mm | 100 mm | 19 mm | 40 mm |
| 90S | 90 mm | 140 mm | 100 mm | 24 mm | 50 mm |
| 90L | 90 mm | 140 mm | 125 mm | 24 mm | 50 mm |
| 100L | 100 mm | 160 mm | 140 mm | 28 mm | 60 mm |
| 112M | 112 mm | 190 mm | 140 mm | 28 mm | 60 mm |
| 132S | 132 mm | 216 mm | 140 mm | 38 mm | 80 mm |
| 132M | 132 mm | 216 mm | 178 mm | 38 mm | 80 mm |
| 160M | 160 mm | 254 mm | 210 mm | 42 mm | 110 mm |
| 160L | 160 mm | 254 mm | 254 mm | 42 mm | 110 mm |
| 180M | 180 mm | 279 mm | 241 mm | 48 mm | 110 mm |
| 180L | 180 mm | 279 mm | 279 mm | 48 mm | 110 mm |
| 200M | 200 mm | 318 mm | 267 mm | 55 mm | 110 mm |
| 200L | 200 mm | 318 mm | 305 mm | 55 mm | 110 mm |
| 225S | 225 mm | 356 mm | 286 mm | 60 mm | 140 mm |
| 225M | 225 mm | 356 mm | 311 mm | 60 mm | 140 mm |
| 250M | 250 mm | 406 mm | 349 mm | 65 mm | 140 mm |
| 280S | 280 mm | 457 mm | 368 mm | 75 mm | 140 mm |
| 280M | 280 mm | 457 mm | 419 mm | 75 mm | 140 mm |
| 315S | 315 mm | 508 mm | 406 mm | 85 mm | 170 mm |
| 315M | 315 mm | 508 mm | 457 mm | 85 mm | 170 mm |
| 315L | 315 mm | 508 mm | 508 mm | 85 mm | 170 mm |
| 315HT | 315 mm | Varies by manufacturer | Varies by manufacturer | 100 mm | around 210 mm |
| 355M | 355 mm | 610 mm | around 560 mm | 100 mm | around 210 mm |
| 355L | 355 mm | 610 mm | around 630 mm | 100 mm | around 210 mm |
Shaft Dimensions Suitable for the Turkish Market in 315 kW and 355 kW Motors
In high-power electric motors, shaft dimensions must be checked more carefully than in standard small and medium-power motors. Especially in the Turkish market, a 355 body and a Ø100 mm shaft diameter are commonly used in 315 kW and 355 kW 1500 rpm B3 mounted electric motors.
For this reason, in 315 kW or 355 kW motor replacements, information such as "315 kW 1500 rpm" or "355 kW 1500 rpm" alone is not sufficient. The existing motor's body type, shaft diameter, shaft length, key dimension, foot mounting holes and shaft height must definitely be checked.
The high-power motor dimensions frequently encountered in the Turkish market are generally as follows:
| Power | Speed | Common Body | Shaft Diameter Common in Turkey | Note |
| 250 kW | 1500 rpm | 315HT / 355 body | Ø100 mm | May vary by manufacturer |
| 315 kW | 1500 rpm | 355M | Ø100 mm | Dimension commonly used in Turkey |
| 355 kW | 1500 rpm | 355M / 355L | Ø100 mm | Drawing check required before ordering |
| 400 kW | 1500 rpm | 355L | Ø100 mm | Preferred in heavy-duty applications |
Advantages of B3 Mounted Motors
B3 mounted electric motors are mounted securely onto the machine thanks to their solid foot mounting. The motor working in a horizontal position makes maintenance and service operations easier. Thanks to the foot-mounted structure, removing, replacing and realigning the motor is more practical.
These motors offer a reliable solution especially in heavy industrial applications. When the correct body and correct shaft dimension are selected, efficient power transmission is achieved between the machine and the motor. This way risks such as vibration, alignment problems and early bearing failure can be reduced.