What is VFD? (variable frequency drive)

 What is VFD? (variable frequency drive)

In this video you will learn about how a VFD i.e. Variable Frequency Drive works and how it controls the speed of ac motors like Induction motor, Synchronous Motor, or PMAC motor.

Variable Frequency Drives Explained - VFD basics. In this video we take a look at variable frequency drives to understand how they work in electrical engineering and power electronics. We look at where and why to use a VFD or VSD, alternating current, direct current, single phase, three phase, frequency, rectifier, DC bus, inverter, capacitor, pwm, pulse width modulation.

Discover how variable speed technology and inverter compressors combine to create the ultimate in HVAC efficiency. Check out Danfoss’s case stories to see how their customers have benefitted or dive a bit deeper into how the technology works with a free eLesson.

In this video, we will learn about VFD and its applications. We will also cover in detail the converter and the DC link.

Induction or alternating current electric motors rotate at a rate that is set by the number of poles inside the motor itself, and the power supplied.

The frequency is directly related to the RPM of a motor. The higher the frequency, the faster the RPM or the higher the engine rotation speed.

In the United States, electric power utilities provide alternating energy with a frequency of 60Hz. A standard two-pole AC motor operating at this frequency provides a nominal rotation of 3600 RPM.

If an application does not require an electric motor running at full speed of 3600 RPM, which is very common, a few solutions exist:

– Using a mechanical speed reducer decreases the output speed by increasing torque – the output gear has more teeth than the input gear. They require lubrication, provide no flexibility, are subtle to vibration and noise, and are not suitable when shafts are distant.

– Adding more sets of poles reduces the speed without altering it electrically. Currently, there are transistor systems that allow poles inside motors to be turned on and off. However, those systems can be complex and do not provide fine control.

– Using a Variable Frequency Drive (VFD) can be configured and fine-tuned to generate a ramp, frequency, and voltage so that the motor operates according to the load requirements (desired speed and voltage).

An important feature of the variable frequency drive is that as the motor speed requirements in a given application change, the drive can simply raise or lower the motor’s speed in order to meet new operating requirements.

The use of VFDs is widespread in numerous industrial and commercial applications.

– In industrial applications, VFDs are used to control from extruders, and electric cranes, to roller coasters, and mechanical bulls, with so much in between!

– In commercial applications, VFDs are widely used in pumps to control flow and even volume in a tank, as well as in the HVAC industry, being considered green technology.

 What is VFD? (variable frequency drive)

In this video you will learn about how a VFD i.e. Variable Frequency Drive works and how it controls the speed of ac motors like Induction motor, Synchronous Motor, or PMAC motor.

Variable Frequency Drives Explained - VFD basics. In this video we take a look at variable frequency drives to understand how they work in electrical engineering and power electronics. We look at where and why to use a VFD or VSD, alternating current, direct current, single phase, three phase, frequency, rectifier, DC bus, inverter, capacitor, pwm, pulse width modulation.

Discover how variable speed technology and inverter compressors combine to create the ultimate in HVAC efficiency. Check out Danfoss’s case stories to see how their customers have benefitted or dive a bit deeper into how the technology works with a free eLesson.

In this video, we will learn about VFD and its applications. We will also cover in detail the converter and the DC link.

Induction or alternating current electric motors rotate at a rate that is set by the number of poles inside the motor itself, and the power supplied.

The frequency is directly related to the RPM of a motor. The higher the frequency, the faster the RPM or the higher the engine rotation speed.

In the United States, electric power utilities provide alternating energy with a frequency of 60Hz. A standard two-pole AC motor operating at this frequency provides a nominal rotation of 3600 RPM.

If an application does not require an electric motor running at full speed of 3600 RPM, which is very common, a few solutions exist:

– Using a mechanical speed reducer decreases the output speed by increasing torque – the output gear has more teeth than the input gear. They require lubrication, provide no flexibility, are subtle to vibration and noise, and are not suitable when shafts are distant.

– Adding more sets of poles reduces the speed without altering it electrically. Currently, there are transistor systems that allow poles inside motors to be turned on and off. However, those systems can be complex and do not provide fine control.

– Using a Variable Frequency Drive (VFD) can be configured and fine-tuned to generate a ramp, frequency, and voltage so that the motor operates according to the load requirements (desired speed and voltage).

An important feature of the variable frequency drive is that as the motor speed requirements in a given application change, the drive can simply raise or lower the motor’s speed in order to meet new operating requirements.

The use of VFDs is widespread in numerous industrial and commercial applications.

– In industrial applications, VFDs are used to control from extruders, and electric cranes, to roller coasters, and mechanical bulls, with so much in between!

– In commercial applications, VFDs are widely used in pumps to control flow and even volume in a tank, as well as in the HVAC industry, being considered green technology.