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 |
Shaft Grounding Rings
Prevent motor downtime by protecting bearings from stray currents generated by variable frequency drives. These grounding rings create a path for stray currents, so they won't damage bearing surfaces. Use them on AC motors.
One-piece rings slide on from the end of the shaft. Two-piece rings simplify installation when motors are connected to equipment.
Use epoxies to install rings without having to drill or tap into motor frames.
Apply shaft coatings to motor shafts before installing the rings to improve the conductivity of the steel shaft surface that touches the grounding ring.
For technical drawings and 3-D models, click on a part number.
Adjustable Motor-Mounting Bases
Increase energy efficiency in belt-driven systems while reducing wear on your components—these bases allow you to adjust your motor position to reach the proper belt tension. Choose a base that fits the NEMA frame of your motor, which is listed on the nameplate.
Bases for constant-speed applications keep your motor in a fixed position while operating equipment with a constant speed, such as fans. You can only adjust the motor position when your system is off.
Bases for variable-speed applications can move while operating to make up for vibration and varying loads. You can adjust the motor position manually while your system is running.
For technical drawings and 3-D models, click on a part number.
| Style | For Motor NEMA Frame Size | For Max. Motor hp | Mounting Orientation | Max. Adjustment | Adjustment Style | Tensioning Type | Lg. | Wd. | Ht. | Each | |
For Linear Adjustment in Constant-Speed Applications | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 143, 143T | 1 1/2 | Horizontal | 3" | Cap Screw | Manual | 10 1/2" | 7 1/2" | 1 1/8" | 00000000 | 000000 |
For Linear Adjustment in Variable-Speed Applications | |||||||||||
| E | 48, 56, 56H, 66, 143T, 145T, 182, 184, 203 | 2 | Horizontal, Vertical | 8" | Hand Crank | Manual | 18 1/8" | 8" | 3 1/4" | 0000000 | 000000 |