Enclosures Designed for Performance

Dripproof (DPG)

This standard enclosure is suitable for most indoor industrial conditions. Cooling air enters through the end-shields at both ends, passes over the coil end-turns, the rotor and stator, then exits through openings in the sides of the frame.

Louvered openings provide protection greater than required by NEMA standards. Air flow is designed carefully to eliminate hot spots and minimize noise. For larger ratings, or for special quieter operating designs, cooling air intake and discharge openings are located in an easily removed “top hat” enclosure. Cooling air enters through both ends of the top hat, passes through the machine as in the standard dripproof motor, and exits through openings in the side of the top hat. Louvered openings provide protection greater than NEMA drip-proof standards.

This type enclosure will be used when filters and/or low noise levels are specified.

Weather Protected Type I (WPI)

A weather protected Type I machine is an open machine with its ventilating passages constructed to minimize the entrance of rain, snow, and air-borne particles to the electric parts.

Its ventilation openings are also constructed to prevent the passage of a cylindrical rod 0.75”/19 mm in diameter.

Features included with this enclosure:

• Custom Polyseal® sealed stator winding insulation
• Bearing protection
• Special attention to leads and lead exits from the motor frame into the conduit box
• Weatherproof conduit box
• Anti-corrosion treatment on both external and internal metal parts
• Corrosion resistant guard screens
• Space Heaters

Weather Protected Type II (WPII)

This enclosure is designed for use outdoors in adverse conditions. Air intake is in the removable top hat portion to minimize entrance of ground level dirt, rain or snow, or heavy gas concentrations.

This enclosure can be modified to include filters for extremely dirt conditions. Air passage includes several abrupt 90 degree changes in direction plus an intake area of reduced velocity to allow solid particles or moisture to drop out before the ventilating air contacts active parts of the motor. Inlet and exhaust openings permit a direct blow through of high velocity winds and airborne particles. Thus, all but super-fine dust and foreign material is virtually eliminated.

Totally Enclosed Water-to-AirCooled (TEWAC) - IP54 or IP55

The TEWAC enclosure isolates all critical motor components from its surroundings. Consequently, it can be used indoors or out in clean or dirty environments. It is provided with a water-cooled heat exchanger mounted in the top portion of the motor for cooling the recirculated ventilating air. Motor heat is conducted away by circulating water and not by discharged hot air. Thus it is suitable for confined areas. It is also the quietest of all available enclosures.

Totally Enclosed Fan Cooled (TEFC) - IP54 or IP55

A Totally Enclosed Fan Cooled (TEFC) motor can be applied in applications, which are indoor or outdoor, and is generally used when a corrosive or hazardous atmosphere is present.

The enclosure is designed to keep the external atmosphere of the motor separated form the internal component of the motor. The frame is ribbed and the end-shields are constructed out of cast iron, which provides rigidity and adds to the cooling capacity. The cooling fan (typically located opposite of the drive end) is attached to the motor shaft and is protected by a fan cover. The fan cover has a grill, which allows the passage of ambient air drawing in by the rotation of the fan. The air is then directed over the length of the ribbed frame of the motor.

Totally Enclosed Air-to-AirCooled (TEAAC) - IP54 or IP55

TEAAC enclosure also provides isolation of critical motor components from the surroundings. In contrast to the TEWAC however, the TEAAC enclosure discharges the waste heat in the immediate area of the motor. The construction of this enclosure utilizes a top mounted air-to-air heat exchanger. External air is drawn in by a shaft mounted fan enclosed in a housing on the end opposite the drive. This air is forced through the cooling tubes at high velocity to promote efficient cooling and cleaning of the tubes. Cooling is accomplished by circulating the internal air over the heat exchanger tubes where the heat is dissipated and the cool air is returned to the active parts of the machine.