• AC Electric Motors

AC Motors

AC Motors
Electric motors account for almost half of the world’s electrical consumption. AC Motors are integral parts of the industrial world that are used to power a variety of applications including pumps, fans, conveyors, mixers, hoists, crushers, and more.
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What are AC Motors?
Electric motors are an integral part of nearly every single industry worldwide. AC induction motors are electric motors that operate on an alternating current. Historically, AC induction motors were designed as fixed speed motors whose base speeds were dependent upon the number of electromagnetic poles and the frequency of AC voltage applied to the motor. Today, the motor’s speed can be controlled using additional devices.

Available Motor Types
ATEX motors are classed for areas with explosive atmospheres. Standards for defining ATEX requirements are derived from the European Directive 2014/34/EC. Our WEG ATEX class motors are Ex nA (non-sparking as defined by the IEC) and available in TEFC only up to 340 HP.

Auger Drive
Auger Drive motors are a type of Farm Duty motor. These TEFC motors include an extended shaft (NDE) and are available up to 1.5 HP. Their centrifugal start switch is also protected against auger drive overspeed. Typical applications include auger-based machinery used in material handling and feed delivery.

Brake motors combine an induction motor with a disc brake. The design ensures long lifespans with minimal maintenance due to few moving parts. Available brake motors are TEFC and range up to 30 HP. Typical applications include transfer, packaging, and cutting machines.

Close-coupled Pump
These motors are a perfect fit for close-coupled pump applications. Options run from 0.5 to 150 HP and feature multiple mounting styles including a rugged C-face mount. Close-coupled pump motors are available in either ODP or TEFC designs. These motors are used in water and wastewater applications.

Close-coupled Pump w/ Internal AEGIS
These motors are the same as other close-coupled pump motors but include an AEGIS shaft grounding ring inside the design. AEGIS grounding rings redirect the additional shaft voltage potentially induced by using an AC drive with a motor. These grounding rings extend the motor's lifespan by protecting the bearings from the additional voltage.

Commercial HVAC
Motors designed for Commercial HVAC applications are available in either ODP or TEFC designs and feature high starting torque. TEFC models are rated IP55 and include options up to 100 HP. Typical applications include non-residential Heating, Ventilation, and Air Conditioning units.

Compressor Duty
Compressor Duty motors are designed for the high torque required by air compressors. These are ODP motors available up to 100 HP. Applications include air compressor use such as ventilation systems, crop sprayers, and dairy machines.

Cooling Tower
Cooling Tower motors are a class of air handling motors that are designed to operate in environments with up to 100% humidity and a highly corrosive nature. Able to be mounted either horizontally or vertically, these motors are TEFC, feature a superior cooling system, and are available up to 100 HP. The typical application of these motors is controlling cooling tower fans.

Crusher Duty
These motors are Severe Duty TEFC motors designed for the most demanding crusher applications. Crusher Duty motors feature vertical and horizontal mounting capabilities, high starting and breakdown torques, and are available up to 500 HP. This line's versatile starting methods include wye/delta, across the line, and part winding starts. Typical applications include pellet mills and rock crushers.

Evaporative Cooler
These ODP motors are used for commercial HVAC applications up to 1 HP. Both Footless and Foot mount styles are available. Typical application is in evaporative cooling devices for buildings in dry climates.

Explosion Proof
Explosion proof motors feature a TENV design. The explosion proof design is suitable for applications requiring UL or CSA certification for hazardous locations. Options are available up to 500 HP. These motors were designed for applications in hazardous areas classified as Division 1/Zone 1. Typical application is in hazardous environments with explosive gases present such as propane gas installation sites, plastic extrusion sites, and paint storing facilities.

Fire Pump
Fire Pump motors are designed for demanding applications with little dirt and humidity. Both ODP and TEFC options are available, and the motor design is focused on cool operation for demanding applications. These motors are available up to 250 HP. The typical application for this motor is in fire sprinkler system pumps.

Fractional HP
Fractional HP motors are general purpose motors with a high starting torque and rated at 3 HP and below. Typical applications are widely varied and include general application such as pumps, compressors, and more.

General Purpose
General Purpose motors are designed to be ideal for a wide range of applications. They feature a high starting torque, ODP and TEFC options, and are available up to 750 HP. These motors are flexible with many potential applications including pumps, compressors, conveyors, and more.

Hydraulic Pump
Hydraulic Pump motors consist of heavy duty cast iron and are designed for intermittent duty. These motors are TEFC, accommodate different mounting angles with an 8-hole SAE-A flange, and are available up to 10 HP. Typical applications include hydraulic pumps for trash compactors, car lifts, and more.

IEC Tru-Metric
IEC Tru-Metric motors are TEFC motors designed and built according to applicable IEC standards. They are F2 mounted, but some frames include the option of easy conversion to F1 or F3 mounting styles. These motors are available up to 450 HP.

IEEE 841
IEEE 841 motors are especially suited for diverse, demanding applications requiring severe duty long life motors. These are severe duty TEFC motors with a superior cooling system, non-sparking fan, and solid feet to reduce vibration and noise. IEEE 841 motors are available up to 450 HP.

Jet Pump
Jet Pump motors are versatile, durable motors useful for both commercial and residential applications. These motors are available as TEFC or ODP, single or three-phase, up to 3 HP. Typical applications include water treatment and processing.

Oil Well Pumping
Oil Well Pumping motors have the high torque and high slip demanded by oil well beam pumping units. These motors are F2 mounted with the option of F1 conversion with cast iron frames. Both ODP and TEFC designs are available up to 100 HP. Typical applications include oil well beam pumping units.

P-Base motors feature a TEFC design and are suitable for dusty and moist environments. These motors feature high starting torque and are available in either HP or HPH types. P-Base motors range up to 150 HP. Typical applications include in-line pumps, wastewater treatment, petro-chemical facilities, agricultural irrigation, and paper mills.

Pad Mount
Pad Mount motors are TEAO motors supplied with a detached terminal box and extended leads for remote installation. These motors are available up to 60 HP. Typical applications include fans and exhausters.

Pool & Spa
These motors are specially designed for pool duty. They are available with either high or low service factors, feature options of either a Square Face or C-Face design, and are dual compartment for easy maintenance. Pool & Spa motors are ODP and available up to 2.5 HP. Typical applications include pumps in pool and spa plumbing.

Poultry Fan
Poultry Fan motors are Farm Duty motors with a TEAO design. They include class B insulation, thermal overload protection, and are available in single phase up to 1 HP. The typical application for these motors is to drive agricultural fans.

Saw Arbor
Saw Arbor motors are definite purpose, intermittent duty motors suitable for applications such as circular saws, pendulum saws, and more. They feature a low profile TEFC design, reinforced cast iron frame, and are available up to 10 HP. Typical applications include circular saws, pendulum saws, and polishing machines.

Vector Duty
Vector Duty motors are specially designed for inverter operation. This design makes these motors ideal for applications where 1000:1 constant torque turndown ratio is required. They feature a TENV design, constant horsepower operation up to 150% base speed, and include spike resistant wire. Vector Duty motors are available up to 20 HP. Typical applications include conveyors, cranes and hoists, extruders, metal processing machines, and more.

Wash Down Duty
These stainless-steel motors are ideal for wash down applications such as food processing, pharmaceutical, and other applications requiring extreme sanitation. They are available in either TEFC or TENV designs up to 10 HP. Typical applications include environments requiring extreme cleanliness and sanitation such as food and beverage and pharmaceutical industries.

There are many terms, ratings, and organizations to know about when dealing with AC Motors. We have assembled a list of many of the terms you will encounter when shopping for motors.

Efficiency Rating
Super Premium Efficiency
As defined by IEC standards, Super Premium Efficiency standards require a minimum 85.7% efficiency for a 4-pole, 1 HP motor. Also known as IE4 induction motors, these motors offer the best energy savings when the motor is fully loaded.

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NEMA Premium Efficiency
Established by NEMA, NEMA Premium Efficiency standards require a minimum 82.5% efficiency for a 4-pole, 1 HP motor. These motors are also known as IE3 induction motors.

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High Efficiency
As defined by IEC standards, High Efficiency standards require a minimum 79.6% efficiency for a 4-pole, 1 HP motor. Also known as IE2 induction motors, High Efficiency motors are roughly equivalent to the old EFF 1 code per the European Committee of Manufacturers of Electrical Machines and Power Electronics (CEMEP).

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Standard Efficiency
As defined by IEC standards, Standard Efficiency standards require a minimum 72.1% efficiency for a 4-pole, 1 HP motor. These motors are also known as IE1 induction motors.

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An ODP (Open Drip Proof) motor features open vents for airflow to keep the motor running cool.

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A TEAO (Totally Enclosed, Air Over) motor is entirely enclosed to protect the motor from dust. Requires external fan. Cooling typically handled by the fan or blower to which the motor is connected.

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TEFC (Totally Enclosed Fan Cooled) motors are completely enclosed to protect the motors from outside contaminants such as dirt and water. Includes an external fan to keep it cooled.

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TENV (Totally Enclosed Non-Ventilated) motors are completely enclosed but not kept cool by a fan. Cooling occurs by releasing heat in other ways such as into the air or through the surface the motor is mounted on.

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An XPFC (Explosion Proof Fan Cooled) motor is intended for environments with hazardous gases or other materials present either always or often.

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Rolled Steel
Rolled steel motor frames are strong and feature good wear resistance.

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Cast Iron
Cast iron motors are durable motors that heat up more slowly and are easier to seal against corrosion.

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Aluminum motors are a lightweight, corrosion resistant option for low-horsepower applications.

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Stainless Steel
Stainless steel motors are highly resistant to corrosion and feature smooth finishes that are easy to clean and sanitize. These features make them ideal for wash-down applications.

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C-face refers to a mounting style used primarily with smaller motors where the weight is supported by a flange on the face of the motor.

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Double C-face
A Double C-face mounting type includes two C-face-style flanges and is seen in our Vector Duty motors. This design allows the motor to be mounted C-face while including another flange for additional equipment to be mounted.

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D-flange style mounting denotes that a motor is designed to be mounted directly to the machine it is driving as part of the machine's design.

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A foot-mounted motor includes metal plates, or "feet," that include holes to receive bolts for mounting to a surface.

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A footless motor has no mounting face, foot, or other mounting mechanisms included in its construction.

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Pad Mount
A pad mount motor includes detached terminal box and extended leads to be installed remotely.

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A P-base mounting style is similar to C-face but includes a threaded shaft for pump motors.

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Removable Feet
Motors with removable foot mounts allow for easy F1, F2, and F3 conversion as required.

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Resilient Base
Resilient base motors are cradle-mounted motors featuring a layer of insulation between the motor and the actual mount. This insulated layer helps decrease vibration and noise while allowing the motor to move slightly without compromising it or its performance.

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Rigid Base
Rigid base mounting means that the mount is directly attached to the frame. A rigid base enables highly accurate alignment.

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Square Flange
A square flange motor is commonly used to drive pool and spa pumps. The name comes from the flange's shape, and it is mounted to the pump with bolts.

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Standards & Organizations
Formerly known as the Canadian Standards Association, CSA Group researches and develops standards aimed at the betterment of Canadian life. CSA Group is responsible for more than 3,000 codes and standards and is accredited in both Canada and the U.S.
The International Electrotechnical Commission (IEC) is an international standards organization headquartered in Switzerland. The IEC publishes standards adhered to internationally for electronic and electrical technology.
The National Electrical Manufacturers Association (NEMA) is the United States' most prominent trade association in the category of electrical equipment manufacturing. NEMA publishes standards that aim to improve market demand while also increasing the safety of equipment.
Underwriters Laboratories (UL) has existed for over a century and is a leading safety standards organization. UL strives to advance safety science and ensure that their mark is a trusted visual statement of safety for a wide variety of products.

Correctly sizing your AC motors benefits you and your application in terms of time, energy, and money saved. Consider these important factors when selecting your motor.

Motor Sizing
AC motor sizing requires evaluation of both starting and running torque requirements of the driven load. Once these requirements are determined, an appropriate motor can be selected based upon its specific speed/torque characteristics. Refer to the performance curves of each motor to ensure proper selection.
What are your speed (RPM) requirements?
The speed of the motor is critical in calculating the motor torque and acceleration/deceleration. The goal when selecting a motor is to deliver a load to a desired position at the correct time, and the motor RPM is a crucial aspect of these equations. Motor speed is traditionally determined by the number of poles in the winding (as see on the table) and can be altered by used of some devices such as AC Drives. The RPM of your chosen motor should match the requirements of your load or specifications from the OEM.
Motor RPM

 Number of Poles
Frequency (Hz)2468

What is your input voltage?
A variety of AC Motors are available for different input voltage ranges. Many motors can be used with more than one input voltage depending on what is available, and in this case the Full Load Amps pulled by the motor will change based on the voltage being applied.

1 or 3-Phase?
In Alternating Current (AC), phase refers to the wave cycle of the power supplied to the motor. AC induction motors are available in either single-phase or 3-phase. Generally, the choice of whether to use single or 3-phase motors will come down to the available power supply.

What kind of equipment are you running?
You need to know the application to know what motor best fits your needs. Different types of equipment will require different starting torques, speeds, and motor construction. We have a long list of motors designed with specific applications in mind, and the motor purchased for a pool pump can differ from the motor used for a crusher.

WEG is one of the largest industrial electric control manufacturers, producing more than 21 million units annually and always striving to improve. Attention to detail is the hallmark characteristic at WEG. All their products are driven by the desire to increase efficiency. WEG operates mainly in the sector of capital goods and is one of the world’s largest manufacturers of electric-electronic equipment operating in five main areas: Motors, Energy, Transmission and Distribution, Automation, and Coat ings. Depending on the project environment and application, they provide a wide variety of product types, sizes, and technology.

WEG Products Include:
  • AC Motors
  • Pushbuttons
  • Soft Starters

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