What is a Variable Frequency Drive? - VFDs.com

A Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed drive, adjustable speed drive, adjustable frequency drive, AC drive, microdrive, and inverter.

Variable Speed Drives - Eaton

Variable Speed Drives Eaton offer a wide range of AFD products to meet a wide array of applications from simple variable torque to more complex industrial applications such as conveyors, mixers and machine controls, all series offer a variety of options and on-board controls.

G120P variable speed drive | HVAC products | Siemens Global

The G120P variable speed drive consists of a control unit, a power module and an operator panel or blanking cover. Therefore, customers pay for what they really need, as for instance only one operator panel is needed to parameterize several variable speed drives.

Drive Dynamics | Variable Speed Drives

Variable Speed Drives. As a leading supplier of variable speed drives (VSD) in Africa we can meet all your requirements. Scroll down to see some of our products or click on the link below to receive a free quote of your requirements.

Variable-speed drives | ABB

ABB's variable-speed drives control the speed of electric motors to match the task in hand, saving power and improving perfomance in industrial plants, shops, offices and homes, across the world . There are few items of equipment that are as crucial to industrial processes – and few that convert as much energy - as the electric motor.

Motion Control | Variable Speed Drives | TB Wood's

Motion Control Variable | TB Wood's TB Wood's offers the most complete line of motion control drives available. Whether you require cast iron or aluminum construction, you'll find a motion control drive to replace obsolete models or satisfy your new applications.

Variable Speed Drives and Soft Starters | Schneider ...

Variable Speed Drives and Soft Starters Discover a wide range of variable speed drives and soft starters offering a powerful and reliable combination for your motor control solutions up to 20 MW. Starting from compact products to custom-engineered solutions, they are developed to the highest quality level to meet your needs in various ...

Chiller Best Practices VSD - Johnson Controls

Variable speed drives (VSDs) can cut a chiller's annual energy use by up to 30 percent while maintaining operating reliably over a wide range of condition. This is accomplished in two ways: • At part load when cooling capacity can be reduced, a VSD chiller inherently uses less energy than a constant speed chiller whenever the compressor ...

Why do variable speed drives fail and how do we test them ...

The physics behind product failure. Before looking at how drives are tested, we need to think about the factors that could make them fail. As we saw in a previous article, the physics of failure (PoF) approach divides products into two types and provides two reasons why products fail. The two reasons why products fail are overstress and wear-out, and these are related to the product's ...

Variable frequency drives - Eaton

Eaton's variable frequency drives, also known as adjustable frequency drives, are designed and manufactured for applications requiring ultra-compact solutions, clean power or future configurability in mind. ... In addition a VFD offers the best energy efficient solution in variable speed applications. Whether designing a new industrial complex ...

Altivar Process - Variable speed drives | Schneider ...

The Altivar Process range of products and systems is the next generation of variable speed drives, designed to deliver IIoT benefits. A smart, connected device with built-in intelligence to gather data and share information to the enterprise level, Altivar Process drives can improve operational efficiency, profitability and reduce total cost of ownership.


Where N s is the synchronous speed, f is the line frequency, and p is the number of poles found as: p = (# of groups of coils) / 3 eq. 2 The number of poles is normally expressed as an even number. The actual output speed of the rotor is related to the synchronous speed via the slip, or percent slip: s = (N s - N) / N s eq. 3 % s = s * 100 eq. 4

Troubleshooting Variable Speed Drives | EC&M

Troubleshooting Variable Speed Drives. Fast, effective troubleshooting combines intuitive and logical thinking with special training, the right test instruments, and "SMARTS."Troubleshooting electrical equipment is always a challenge. As electrical equipment incorporate more complex electronics, the challenge becomes increasingly formidable.

Variable Speed Motor Controller for sale | eBay

Get the best deals on Variable Speed Motor Controller when you shop the largest online selection at eBay.com. Free shipping on many items ... Johnson Controls Variable Speed Motor Drive. $250.00. Free shipping. Make Offer - Johnson Controls Variable Speed Motor Drive. Side Refine Panel. Shop by Category. Drives & Motor Controls;

Variable Speed Drives | HVAC Control | HVAC Heating & Cooling

The variable speed drive (VSD) or variable frequency drive (VFD), among other names (adjustable-frequency drives (AFD), AC drives, micro-drives, or inverter drives). The application of variable speed drives has brought about a new way of engineering buildings and controls systems HVAC.

Variable Speed Drives | Voith

Variable speed drives fitted with a Voith geared variable speed coupling are compact, efficient – and offer unbeatable reliability. A product proven to provide 99.97% reliability is something you can count on in your designs – such as a geared variable speed coupling from Voith.

Variable speed drives - Schneider Electric

Catalogues "Altivar 12 variable speed drives" "Altivar 312 variable speed drives" "Altivar 212 variable speed drives" page 1/16 "Altivar 71 variable speed drives" (1) Heating, Ventilation and Air Conditioning (2) The type of cooling depends on the model. Please consult pages 1/16 to 1/22.

Adjustable Speed Drives | Variable Speed Drives – Zero-Max

Adjustable speed drive speed adjustments are easily made by moving a lever control through an arc or turning the hand-wheel of a screw type control. In either case, easy and precise speed control settings are possible with Zero-Max adjustable speed drives - also referred to interchangeably as variable speed drives.

China Variable Speed Drive, Variable Speed Drive ...

China Variable Speed Drive manufacturers - Select 2020 high quality Variable Speed Drive products in best price from certified Chinese Inverter manufacturers, Power Inverter suppliers, wholesalers and factory on Made-in-China.com

What Is A Variable Speed Drive? - Automation ...

Nov 25, 2015· This is where a variable speed drive comes in. A variable speed drive (also known as a VSD, variable frequency drive, VFD, adjustable speed drive, inverter, converter or simply, 'a drive') is a device which is used to control the speed or torque generated by an electric motor.

SAG Mill Variable Speed Drive

Variable Speed Drives. Variable speed drives are not new. Many have been used in the cement industry on mills drawing up to 6,525 kW (8,750 hp). There are 39 gearless drive installations worldwide, but only one in North America (St. Lawrence Cement). Recently both Afton and Lornex in British Columbia installed variable speed dc drives on wet ...

Variable Speed Drives - Lovejoy - a Timken company

Variable Speed Drives Very economical and reliable method of speed change Allows the user to find the ideal speed without changing sheaves and belts; especially important on applications where final driven speed is critical and difficult to attain with two fixed-diameter sheave Speed range within the ratio is infinite, and speed change

Variable Speed Drives - Halliburton

Summit ESP® variable speed drives (VSD) adjust to changing well conditions to deliver optimal production. These drives operate with high efficiency in extreme environments. Both electric submersible pump (ESP) systems and horizontal pumping systems (HPS) benefit from connection to our drives.

What is a VFD? (Variable Frequency Drive) - YouTube

Oct 29, 2018· Well, it stands for Variable Frequency Drive. They are used for running an AC motor at variable speeds or let them ramp up their speed to give them a …

What is a variable speed drive (VSD)?

All variable speed drives have soft starting as an inherent feature & thus they will definitely reduce the starting kick of motors. And, variable speed drives will reduce current requirement of motors provided the load is less. But, that could happen without drives even.

Variable Frequency Drives - Motor Speed Controls ...

A compact variable speed drive can help run fans, blowers, conveyors and machine tools in areas with limited space. Automatic energy savings help reduce motor loss and electric power costs. Frenic-MEGA drives can provide compact yet powerful solutions for AC drive requirements in both variable- and constant-torque applications.

Basic Variable Frequency Drive Maintenance Tips

So, whilst the rapid introduction of new technology and variable frequency drives is a key factor in the success of manufacturers of VFDs, it also creates the conditions for fierce competition as manufacturers compete and need to survive in a marketplace that demands a customized variable frequency drive delivered at the cost and speed of a ...

Problems caused by Variable frequency drives

Variable frequency drives, however, work by converting that sinusoidal line AC voltage to DC, then back to a pulse-width-modulated (PWM) AC voltage of variable frequency, by which the motor speed can be controlled. The switching frequency of these pulses can range from 1 kHz to 20 kHz and, while the voltages may be balanced in peak amplitude ...