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what is an air over motor

by Armani Veum Published 3 years ago Updated 3 years ago

An air over motor is designed to be mounted in the air stream, typically of something like a propeller fan. Back when I did HVAC service work, I saw air over motors burn up several times when the v-belt broke on a sidewall mounted propeller fan.

Air-over: Motors for fan or blower service and cooled by the air stream from the fan or blower.

Full Answer

What is an air motor?

The air motor is one of the toughest and most versatile power units available to the design engineer. The features and characteristics of the air motor make it the natural choice of power for industrial applications, present and future. Compact and lightweight

What is a fan motor on an air conditioner?

The fan motor is a fairly uncomplicated yet vital part of an air conditioner. It’s the part of the unit that pumps air through the system. Without that circulation of air, your AC won’t cool your home.

What is air over hydraulic system?

Thread: Air over hydraulic. Another air over hydraulic system consists of an air cylinder working as the motor of a piston type hydraulic pump. The pressure times the area of the air piston will equal the pressure times the area of the hydraulic piston. The air motor can be made to reciprocate continuously or for aplications like setting...

What are the advantages of air motors?

Air motors develop far more power in relation to their size and weight than most other motor types. Torque increases with load The output of an air motor is relatively constant within a wide speed range – when an increase in load lowers the speed the torque increases. Steplessly adjustable power output

What is open air over motor?

An open drip proof or ODP motor is a type of motor that typically runs cooler and does not overheat. Due to the fact that the chamber has open vents and air can flow directly over the windings, this open drip proof motor tends to be slightly more efficient because the windings are cooler.

What is a totally enclosed air over motor?

Totally Enclosed Air Over/Airtight (TEAO) This motor has a dust-tight frame or enclosure. It is typically installed in the airstream, and the air movement generated by the fan passes over the motor to provide cooling. TEAO motors would be used in areas with direct drive where the motor is in the airstream.

Is a TENV motor explosion proof?

Totally Enclosed Non-Ventilated (TENV) These are suitable for uses which are exposed to dirt or dampness, but not very moist or hazardous (explosive) locations.

Is a Tefc motor explosion proof?

The enclosure is "Totally Enclosed". This means that the motor is dust tight, and has a moderate water seal as well. TEFC motors are not secure against high pressure water nor submersible. They are also not explosion proof without additional modifications.

Can a Tefc motor be used outdoors?

A totally enclosed, fan-cooled (TEFC) motor is much more adaptable to outdoor locations and high moisture areas. With a bit of care, you can expect this type of motor to work well and have a long life.

What is the difference between TENV and TEFC?

Totally Enclosed, Fan-Cooled (TEFC) Motors have an external fan which circulates outside air to the motor. Totally Enclosed, Nonvented (TENV) Motors do not have air openings. While air does not freely move between the inside and outside, the motor's construction is not air- or liquid-tight.

What does TEBC mean on a motor?

TOTALLY ENCLOSED, BLOWER COOLED (TEBC) — A totally enclosed motor constructed with a fan on the opposite end of motor shaft designed to blow cooling air over the motor. The fan is powered separately from the motor to provide constant air flow whether the motor is running or stopped.

How do I know if my motor is explosion proof?

Motors that satisfy UL explosion proof certification are clearly identifiable by a UL listing identification plate, affixed to the motor enclosure. The plate defines the class, division and group compliance of the motor.

Which motor is used for elevators?

Motor used for elevators is generally induction motor. Concept: Induction motor: The motor which works on the principle of electromagnetic induction is known as the induction motor.

What does TEFC mean on electric motor?

totally enclosed fan cooledA TEFC (totally enclosed fan cooled) motor is a far better choice, as it “totally encloses” the interior, with some exceptions.

Can TEFC motors be used in hazardous locations?

It isn't unusual though, in a petrochemical plant, to have areas where the T-code is T3A-T3C. In these cases, normal TEFC motors may run too hot and cannot be used. The surface temperature of any motor space heaters installed for the prevention of condensation must also be considered in hazardous locations [See Sec.

How does a Tefc motor work?

0:001:28Total Enclosed Fan Cooled vs Open Drip Proof (TEFC vs ODP) - YouTubeYouTubeStart of suggested clipEnd of suggested clipOh an open reproof idler motor there are open vents to allow the outside air to pass through theMoreOh an open reproof idler motor there are open vents to allow the outside air to pass through the windings for cooling. This will also allow to pull in foreign material. For an example this video

What is an air motor?

The air motor is one of the toughest and most versatile power units available to the design engineer. The features and characteristics of the air motor make it the natural choice of power for industrial applications, present and future. Compact and lightweight. An air motor weighs only 1/4 as much as an electric motor with ...

How much does an air motor weigh?

An air motor weighs only 1/4 as much as an electric motor with the same output and occupies only 1/6 of the space. Air motors develop far more power in relation to their size and weight than most other motor types. Torque increases with load.

How many vanes are in a high speed motor?

In order to keep the centrifugal force down, high-speed mo- tors, or rather their rotors, are long and slim and equipped with only three or four vanes. Number of vanes. The number of vanes in the motor, which can range between 3 and 10, is an important design consideration.

How does torque affect air motors?

Torque increases with load. The output of an air motor is relatively constant within a wide speed range – when an increase in load lowers the speed the torque increases. Steplessly adjustable power output. The torque and output of an air motor can be adjusted step- lessly by varying the working pressure.

What is a lubrication free motor?

Lubrication free motors. The traditional vane motors are lubricated by the compressed air to which a small amount of oil is added. Lubrication free motors do not need any oil added to the air. These motors are equipped with vanes made of a special low friction material and have permanently lubricated bearings.

How many kW does a vane motor have?

Vane motors are produced with power ratings up to approximately 5 kW. Design. – A slotted rotor rotates eccentrically in the chamber formed by the cylinder and cylinder end plates. – Since the rotor is off-center and its diameter smaller than that of the cylinder, a crescent-shaped chamber is created.

Which way does a vane turn?

The motor turns in a clockwise direction as seen from the rear end. Besides this type of vane motor there are also counter clockwise and reversible motors. Counter clockwise motors are designed the same way as the clockwise motors but the cross section is mirrored.

What is an air over hydraulic pump?

Air over hydraulic pumps are simple cheap and small. Their output is pulsing and they tend to use a lot of air. Along the lines of what Jim said, consider a large diameter air cylinder. Lots of area, some air pressure and you have a bunch of force on the rod.

What happens when an air cylinder strokes at high pressure?

Give the hydraulic cylinder a simple check valve so when it strokes at high pressure, the fluid that's pumped out is stuck behind a check valve.

How does cool air work in a car?

Cool air is then forced over the fins -- typically by a fan in cars. For aircraft and motorcycles, the vehicle 's speed alone moves enough cool air over the fins to keep the engine cool. Some air-cooled engines may also have ducts around the engine to keep air flowing to the hottest areas.

What is the premise of an air cooled engine?

The premise of an air-cooled engine is actually pretty simple: Let air flow over the engine to keep it cool.But since this article needs to be a little bit longer than that, we'll touch on a few more details (for my editor's sake, anyway). Most modern cars use water-cooled engines with radiators, water pumps and hoses that circulate a water ...

Why are all engines air cooled?

To be fair, all engines are technically air-cooled because even water-cooled engines use air to cool the fluid in the radiator. But let's not split hairs. Air-cooled engines have fins extending out from the engine to pull heat away. Cool air is then forced over the fins -- typically by a fan in cars.

What keeps an air cooled engine's temperature low?

Another design feature that keeps an air-cooled engine's temperature low is horizontally opposed cylinders -- they face away from each other and are spread farther apart than a typical water-cooled engine.

What is the longest running air cooled engine?

Common Uses for Air-cooled Engines. Aircraft have had the longest running air-cooled track record because many helicopters and small planes have remained air-cooled right from the start. The air-cooled engine has had a long and well-loved history. At least, depending on whom you talk to.

Is it better to have an air cooled engine or a liquid cooled engine?

Air-cooled engines also warm up a lot faster than liquid-cooled engines and don't have any risk of the coolant freezing, which is beneficial if you're operating the vehicle in extremely cold temperatures. But there are some considerable drawbacks, too. For starters, air-cooled engines are more likely to overheat.

Is an air cooled car engine bad?

Yeah, that's a bummer. They can also be more expensive to build and the large fans used to cool the engine can take away a lot of power. This doesn't mean that air-cooled engines are bad or ineffective.

What is an ODP motor enclosure?

The 7 most common types of enclosures are: 1. Open Drip Proof (ODP) Premium Efficient Super-E motor with Open Drip Proof (ODP) construction by BALDOR. Allows air to circulate through the windings for cooling, but prevent drops of liquid from falling into motor within a 15 degree angle from vertical. Typically used for indoor applications in ...

How are hazardous location motors classified?

Hazardous location motor applications are classified by the type of hazardous environment present, the characteristics of the specific material creating the hazard, the probability of exposure to the environment, and the maximum temperature level that is considered safe for the substance creating the hazard.

What is the NEMA standard for motor enclosures?

NEMA standards MG1-1.25 through 1.27 define more than 20 types of enclosures under the categories of open machines, totally enclosed machines, and machines with encapsulated or sealed windings.

What is the air gap on a TEFC motor?

An air-gap is usually left between the ribs and the fan cover for this purpose . Internally, on smaller TEFC motors, the rotor end-rings are usually constructed with ribs to provide additional agitation of the internal air for even distribution of temperature and to allow the radiation of heat from the end shields and frame.

Why do rotating machines generate heat?

All rotating electrical machines generate heat as a result of the electrical and mechanical losses inside the machine. Losses are high during starting or dynamic braking. Also, losses usually increase with increased loading. Cooling is necessary to continuously transfer the heat to a cooling medium, such as the air.

How to describe cooling?

The system used to describe the method of cooling is currently being changed by IEC, but the designation system currently in use is as follows: 1 A prefix comprising the letters IC ( index of cooling) 2 A letter designating the cooling medium, this is omitted if only air is used 3 Two numerals which represent: 4 The cooling circuit layout 5 The way in which the power is supplied to the circulation of the cooling fluid, fan, no fan, separate forced ventilation, etc

What is an open drip motor?

An open drip proof or ODP motor is a type of motor that typically runs cooler and does not overheat. Due to the fact that the chamber has open vents and air can flow directly over the windings, this open drip proof motor tends to be slightly more efficient because the windings are cooler.

Why is a TEFC motor enclosed?

A benefit to having the motor totally enclosed is that it’s protected from the outside environment, including dust, airborne contaminants, and many weather disturbances such as wind-driven rain. A TEFC motor is the recommended choice when your load is in an outdoor or wet location.

Does an ODP motor need external cooling?

Although the ODP motor doesn’t require external cooling (our idler motors have an internal fan) the open concept can allow airborne contaminants and dust to enter the chamber. To protect against anything in the environment, North America Phase Converter idler motors all include laminated windings and sealed bearings.

Is a Napces ODP motor safe?

NAPCES ODP idler motors are completely safe to use in all indoor industrial settings. On the other hand, a totally enclosed fan cooled, or TEFC motor has a closed off chamber which requires the use of an external fan to blow air over it.

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