In a wide variety of ac gearmotor

ac gearmotor are available in a wide variety of torques ranging from 15 to 627 in-lbs in both right angle and parallel shaft designs with industry standard mounting configurations. The Right Angle single reduction units feature an Internal Expansion Bladder and Mobil® SHC634 Synthetic oil for long maintenance free operation. The Internal Expansion Bladder keeps the lubrication free of contaminates by eliminating the need to vent the reduction gearbox and allows all position mounting.

widely used of speed reducers

In these widely used speed reducers, a worm gear drives a worm wheel to provide output motion at a right angle to the motor shaft, Figure 2. The worm gears and worm wheel have non-intersecting, perpendicular axes, and the meshing action between gears occurs over a relatively large contact area. This meshing action consists primarily of a sliding motion that creates friction between the gears.

High speed gearbox can achieve significant savings

High speed gearbox can achieve significant savings, both in drive component costs and energy costs. But there is another good reason to use high speed planetary gearboxes: to reduce health risks from greenhouse gases in our environment. According to the U.S. Dept. of Energy, industrial electric motor systems account for 1/12 of all greenhouse gas emissions from fossilfuel power plants. Therefore, cutting motor power consumption with efficient speed reducers will help to ease this global problem.

the gearing mechanism inside the Cycloidal reducer.

Cycloidal reducer,The word Cycloid, with its adjective Cycloidal, is derived from Hypocycloid which describes the curve traced by a point on the circumference of a smaller circle rotating inside the circumference of a larger fixed circle.  Just like words such as helical, worm, spur, and bevel, cycloidal is a generic adjective; cycloidal transmission merely describes the gearing mechanism inside the speed reducer.

Helical worm Gearmotor applications include

Some of these Helical worm Gearmotor applications include:
Custom NMRV worm geared motors For Metal Cutting and Forming Machinery - Where metal cutting, drilling, and forming operations require workpiece positioning accuracy, the low backlash of double-enveloping worm gears keeps positioning accuracy high, even with heavy workpieces and repeated starting and stopping motions.

What is the Difference Between Spur Helical Bevel and Worm Gears

Gears are a crucial part of many motors and machines. Gears help increase torque output by providing gear reduction and they adjust the direction of rotation like the shaft to the rear wheels of automotive vehicles. Here are some basic types of gears and how they are different from each other.
Spur Gears

The most common gears are spur gears and are used in series for large gear reductions. The teeth on spur gears are straight and are mounted in parallel on different shafts. Spur gears are used in washing machines, screwdrivers, windup alarm clocks, and other devices. These are particularly loud, due to the gear tooth engaging and colliding. Each impact makes loud noises and causes vibration, which is why spur gears are not used in machinery like cars. A normal gear ratio range is 1:1 to 6:1.

Helical Gears

Helical gears operate more smoothly and quietly compared to spur gears due to the way the teeth interact. The teeth on a helical gear cut at an angle to the face of the gear. When two of the teeth start to engage, the contact is gradual--starting at one end of the tooth and maintaining contact as the gear rotates into full engagement. The typical range of the helix angle is about 15 to 30 deg. The thrust load varies directly with the magnitude of tangent of helix angle. Helical is the most commonly used gear in transmissions. They also generate large amounts of thrust and use bearings to help support the thrust load. Helical gears can be used to adjust the rotation angle by 90 deg. when mounted on perpendicular shafts. Its normal gear ratio range is 3:2 to 10:1.

Bevel Gears

Bevel gears are used to change the direction of a shaft’s rotation. Bevel gears have teeth that are available in straight, spiral, or hypoid shape. Straight teeth have similar characteristics to spur gears and also have a large impact when engaged. Like spur gears, the normal gear ratio range for straight bevel gears is 3:2 to 5:1.

Spiral teeth operate the same as helical gears. They produce less vibration and noise when compared to straight teeth. The right hand of the spiral bevel is the outer half of the tooth, inclined to travel in the clockwise direction from the axial plane. The left hand of the spiral bevel travels in the counterclockwise direction. The normal gear ratio range is 3:2 to 4:1.
Hypoid gears are a type of spiral gear in which the shape is a revolved hyperboloid instead of conical shape. The hypoid gear places the pinion off-axis to the ring gear or crown wheel. This allows the pinion to be larger in diameter and provide more contact area.
The pinion and gear are often always opposite hand and the spiral angle of the pinion is usually larger then the angle of the gear. Hypoid gears are used in power transmissions due to their large gear ratios. The normal gear ratio range is 10:1 to 200:1.
Worm Gears

Worm gears are used in large gear reductions. Gear ratio ranges of 5:1 to 300:1 are typical. The setup is designed so that the worm can turn the gear, but the gear cannot turn the worm. The angle of the worm is shallow and as a result the gear is held in place due to the friction between the two. The gear is found in applications such as conveyor systems in which the locking feature can act as a brake or an emergency stop.

What is a variable speed drive

A variable speed drive is a piece of equipment that regulates the speed and rotational force, or torque output, of an electric motor.
The background and technology
There are millions of motors in use in industry and offices around the world. They operate sewage and irrigation pumps, milking machines and ski lifts, paper machines and power-plant fans, sawmill conveyors and hospital ventilation systems, to name just a few examples.

In fact, more than 65 percent of industrial electrical energy is consumed by motors.

In many cases, motors are controlled by means of a valve that regulates the flow of fuel or a vane that controls the airflow while the speed of the motor itself remains unchanged. These and other methods, such as using two-speed motors or controlling them by switching on or off, are inefficient from an energy point of view.

One of the main reasons why drives save energy is because they can change the speed of an electrical motor by controlling the power that is fed into the machine.

Drives and energy efficiency
ABB estimates that its drives in operation worldwide save about 115 million megawatt hours of electricity every year, the equivalent of 14 nuclear reactors.

That also amounts to a reduction of carbon dioxide emissions by 97 million tons per year, more than the annual emissions of Finland.

Using a drive with a 30 kilowatt (kW) motor running 5,000 hours a year to control the air flow in a ventilation system brings an annual saving of 76,500 kW hours of electricity compared with regulating the flow rate by adjusting a damper.

The saving is 51,000 kW hours per year compared with modulating the fans on or off and 52,500 kW hours versus the use of a two-speed motor.

The energy savings achieved can result in the investment to install drives being recovered in as little as a few months. For many pump and fan applications expenditure is often recouped in less than a year.

Still, less than 10 percent of the motors in use worldwide are equipped with drives.

Drives come in many different sizes and are typically encased in boxes that can be as small as a milk carton or as big as a wardrobe, depending on the size of the motor or motors they regulate.

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What are the characteristics of PLANETARY GEAR

Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Typically, the planet gears are mounted on a movable arm or carrier which itself may rotate relative to the sun gear. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears. Planetary gears (or epicyclic gears) are typically classified as simple and compound planetary gears. Simple planetary gears have one sun, one ring, one carrier, and one planet set. Compound planetary gears involve one or more of the following three types of structures: meshed-planet (there are at least two more planets in mesh with each other in each planet train), stepped-planet (there exists a shaft connection between two planets in each planet train), and multi-stage structures (the system contains two or more planet sets). Compared to simple planetary gears, compound planetary gears have the advantages of larger reduction ratio, higher torque-to-weight ratio, and more ?exible con?gurations.

The axes of all gears are usually parallel, but for special cases like pencil sharpeners they can be placed at an angle, introducing elements of bevel gear. Further, the sun, planet carrier and annulus axes are usually coaxial.

Advantages of planetary gears over parallel axis gears include high power density, large reduction in a small volume, multiple kinematic combinations, pure torsional reactions, and coaxial shafting. Disadvantages include high bearing loads,constant lubrication requirements, inaccessibility, and design complexity.The planetary gearbox arrangement is an engineering design that offers many advantages over traditional gearbox arrangements.

One advantage is its unique combination of both compactness and outstanding power transmission efficiencies. A typical planetary gearbox efficiency loss in a planetary gearbox arrangement is only 3% per stage. This type of planetary gearbox efficiency ensures that a high proportion of the energy being input is transmitted through the gearbox, rather than being wasted on mechanical losses inside the gearbox.

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