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Totally enclosed squirrel-cage induction motors - the general-purpose workhorse for dusty and outdoor industrial duty.
Vertical motors for cooling-tower fans, built to run reliably in constant moisture and temperature swings.
Slip-ring crane and hoist motors built for intermittent duty with frequent starts, reversals and braking.
Flameproof (Ex d) motors that contain an internal explosion and prevent ignition of a surrounding hazardous atmosphere.
High-voltage AC induction motors for large, continuous-duty industrial drives such as fans, pumps, compressors and mills.
Non-sparking (Ex nA) motors for Zone 2 areas where a hazardous atmosphere is unlikely in normal operation.
Open (drip-proof) squirrel-cage induction motors for clean, well-ventilated indoor installations.
Heavy-duty AC motors for rerolling-mill stands and auxiliaries, designed for frequent starts, shock loads and high peak torque.
Rugged motors for roller-table drives in steel mills, built for frequent reversing, high torque and hot, dusty surroundings.
Vertical hollow-shaft motors that couple directly to vertical turbine and deep-well pumps, with a non-reverse ratchet where required.
Slip-ring induction motors in a totally enclosed enclosure for dusty or damp heavy-duty applications.
Slip-ring (wound-rotor) induction motors in an open drip-proof enclosure, for loads needing high starting torque and controlled starting...
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These AC motors cover the full spread of industrial duties, from open and closed cage motors for pumps and fans to slip-ring machines for crane and rolling-mill work. The range includes flameproof motors and non-sparking motors for hazardous areas, high-voltage motors for large compressors and pumps, vertical hollow shaft motors for vertical turbine pumps, and cooling tower, roller table and rerolling mill duty machines.
The split that matters most is cage versus wound-rotor. A cage motor is the simplest and cheapest to keep running, but its starting current is high and its starting torque fixed by the rotor design. A wound-rotor (slip-ring) motor lets you add external resistance to cut starting current and raise starting torque, which suits heavy, frequently started loads such as cranes and some mills. Open types breathe site air for cooling and suit clean rooms and indoor halls; closed (TEFC) types keep dust and moisture out.
How to choose:
Use the motor current and cable calculator to size supply cable, and compare with the wider motors range if you also need DC or brake types.
A squirrel-cage motor has a fixed, short-circuited rotor, so it is simple and low maintenance but draws a high starting current. A slip-ring (wound-rotor) motor brings the rotor winding out to slip rings so external resistance can be added, reducing starting current and increasing starting torque. It needs more maintenance on rings and brushes.
A flameproof motor (Ex d) is built so an internal explosion cannot ignite the outside atmosphere, and is used where flammable gas can be present in normal operation or during faults. A non-sparking motor (Ex n type) is meant for areas where gas is unlikely in normal operation. The area classification drawing decides, and a qualified engineer should confirm it.
Open motors are cooled by drawing room air through the windings, so they run cooler for the frame size but need clean, dry surroundings. Closed fan-cooled motors keep dust and water out and are the safer default for foundries, cement, textile and outdoor pump houses. Choose the IP rating to match the dust and water exposure at site.
Crane duty motors are rated for intermittent, high-start-frequency duty, commonly stated as S3 with a cyclic duration factor such as 40 percent, with high overload torque and robust rotor construction. A continuous-duty motor of the same kW will overheat on a crane. Give the duty class, starts per hour and load inertia when ordering.
Vertical hollow shaft motors are normally used, because the pump shaft passes through the rotor and is held at the top by a coupling nut. They typically include a non-reverse ratchet to stop reverse spin on shutdown and a thrust bearing sized for the pump's axial load. Share the pump thrust figure and shaft diameter for selection.
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