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
Replace old base-mount motors to keep your equipment moving. Motors are rated for continuous duty and mount at any angle. You can wire for clockwise or counterclockwise rotation; instructions are included.
To use a motor with a variable frequency drive (AC motor speed control), choose a three-phase motor that’s inverter rated.
Motors with a welded base have a base that's welded to the enclosure.
For technical drawings and 3-D models, click on a part number.
O'all | 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 | |
115/230 Volts AC, Single Phase | ||||||||||||||
NEMA 143T—Welded Base (Keyed Shaft) | ||||||||||||||
| 1 | 1,725 | 12.8/6.4 | No | Totally Enclosed Fan Cooled (TEFC) | 13 1/2" | 9 1/2" | 9 1/4" | 7/8" | 2 1/4" | 3 1/2" | F | 311° | 00000000 | 0000000 |
208-230/460 Volts AC, Three Phase | ||||||||||||||
NEMA 143T—Welded Base (Keyed Shaft) | ||||||||||||||
| 1 | 1,760 | 3.1-3/1.5 | Yes | Open Dripproof (ODP) | 11 1/4" | 9" | 7" | 7/8" | 2 1/4" | 3 1/2" | F | 311° | 00000000 | 000000 |
| 1 | 1,760 | 3.1-3/1.5 | Yes | Totally Enclosed Fan Cooled (TEFC) | 12 1/2" | 9 1/2" | 7 1/4" | 7/8" | 2 1/4" | 3 1/2" | F | 311° | 00000000 | 000000 |
| 2 | 3,490 | 5.3-5/2.5 | Yes | Totally Enclosed Fan Cooled (TEFC) | 13 1/2" | 9 1/2" | 7 1/4" | 7/8" | 2 1/4" | 3 1/2" | F | 311° | 00000000 | 000000 |
Adjustable Motor-Mounting Bases
Increase energy efficiency in belt-driven systems while reducing wear on components—use one of these bases to adjust your motor position to get the proper belt tension.
Bases for constant-speed applications keep your motor in a fixed position while operating.
Bases for variable-speed applications allow movement while operating to compensate for vibration and varying loads. They’re often used for automatic belt tensioning with spring-loaded pulleys in variable-speed drive applications.
For technical drawings and 3-D models, click on a part number.
| For Motor NEMA Frame Size | For Max. Motor hp | Mounting Orientation | Max. Adjustment | Adjustment Style | Lg. | Wd. | Ht. | Each | ||
For Linear Adjustment in Constant-Speed Applications | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A | 143, 143T | 1 1/2 | Horizontal | 3" | Cap Screw | 10 1/2" | 7 1/2" | 1 1/8" | 00000000 | 000000 |
For Linear Adjustment in Variable-Speed Applications | ||||||||||
| E | 48, 56, 66, 143T, 145T, 182, 184, 56H, 203 | 2 | Horizontal, Vertical | 8" | Hand Crank | 18 1/8" | 8" | 3 1/4" | 0000000 | 000000 |