About Electric Motors
When replacing a motor, use the information on your motor’s nameplate to guide your selection.
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Base-Mount AC Motors




To get equipment moving, bolt the base of these motors to any flat surface and connect the shaft to your load. They’re rated for continuous duty, so they’re often used with equipment that requires constant power, like fans, pumps, and conveyors.
When pairing with a variable frequency drive (AC motor speed control), choose a three-phase motor that’s inverter rated.
Motors with a NEMA frame size have an oversized shaft and high-quality bearings to stand up to heavy and side loads better than even our domestic motors. Densely packed windings and thin laminations ensure the motor stays cool and runs efficiently.
Totally enclosed fan cooled (TEFC) enclosures don’t have vents, so they can be used in damp and dirty environments. They have an external fan that blows air over the outside of the enclosure to keep the motor cool. They’re not airtight, but since air isn’t flowing inside the enclosure, the motor won’t run as efficiently as it would in an open enclosure.
Open drip proof (ODP) enclosures have vents that let air flow over the motor, which keeps it cool and helps it run efficiently. Use them in clean, dry environments—the enclosure blocks drips and debris that fall from above, but dust and moisture can pass through the vents.
For technical drawings and 3-D models, click on a part number.
Overall | Shaft | Insulation | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Power, hp | Max. Speed, rpm | Full Load Current, A | Inverter Rated | Motor Enclosure Type | Lg. | Wd. | Ht. | Dia. | Lg. | Center to Base | Class | Max. Temp., °F | Each | |
230/460 Volts AC, Three Phase | ||||||||||||||
NEMA 254T | ||||||||||||||
7 1/2 | 1,170 | 19.1/9.5 | Yes | Totally Enclosed Fan Cooled (TEFC) | 23 5/8" | 17 5/8" | 14 3/4" | 1 5/8" | 4" | 6 1/4" | F | 311° | 0000000 | 000000000 |
15 | 1,765 | 34.5/17.3 | Yes | Totally Enclosed Fan Cooled (TEFC) | 23 5/8" | 17 5/8" | 14 3/4" | 1 5/8" | 4" | 6 1/4" | F | 311° | 0000000 | 00000000 |
15 | 1,770 | 35.7/17.9 | Yes | Open Dripproof (ODP) | 20 1/2" | 16 5/8" | 14 3/4" | 1 5/8" | 4" | 6 1/4" | F | 311° | 0000000 | 00000000 |
NEMA 256T | ||||||||||||||
10 | 1,170 | 25.6/12.8 | Yes | Totally Enclosed Fan Cooled (TEFC) | 25 3/8" | 17 5/8" | 14 3/4" | 1 5/8" | 4" | 6 1/4" | F | 311° | 0000000 | 00000000 |
20 | 1,760 | 46.0/23.0 | Yes | Totally Enclosed Fan Cooled (TEFC) | 25 3/8" | 17 5/8" | 14 3/4" | 1 5/8" | 4" | 6 1/4" | F | 311° | 0000000 | 00000000 |
20 | 1,770 | 46.6/24.0 | Yes | Open Dripproof (ODP) | 22 1/4" | 16 5/8" | 14 3/4" | 1 5/8" | 4" | 6 1/4" | F | 311° | 0000000 | 00000000 |
Speed-Control AC Gearmotors




Start, stop, reverse direction, and control the speed of these gearmotors from the mounted keypad. Because you can fine tune output speed and direction, these gearmotors are often used in material processing and handling applications, such as controlling the speed of a mixer or conveyor. These gearmotors are both a motor and speed reducer in one to lower speed while increasing torque. All transmit motion inline with the motor. Secure them to flat surfaces with the base mount. These gearmotors have a TEFC (totally enclosed fan cooled) enclosure that protects better than ODP (open drip proof) enclosures. They are not airtight but can be used in dirty, dusty, and damp environments. To keep the motor cool, they have an external fan that blows air over the outside of the motor.
For technical drawings and 3-D models, click on a part number.
Overall | Shaft | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Power, hp | Speed Range @ Continuous Operating Torque | Full Load Current, A | Lg. | Wd. | Ht. | Dia. | Lg. | Center to Base | Environmental Rating | Each | |
240 Volts AC, Three Phase | |||||||||||
1 | 1.9 rpm to 12 rpm @ 5,440 in.-lbs. | 3.5 | 22 1/2" | 9 3/4" | 12 1/2" | 1 5/8" | 3 1/8" | 5 1/2" | IP54 | 0000000 | 000000000 |
460 Volts AC, Three Phase | |||||||||||
1 | 1.9 rpm to 12 rpm @ 5,440 in.-lbs. | 1.7 | 22 1/2" | 9 3/4" | 12 1/2" | 1 5/8" | 3 1/8" | 5 1/2" | IP54 | 0000000 | 00000000 |