Variable Frequency Drives
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- Save energy and improve system efficiency
- Convert power in hybridization applications
- Match the speed of the drive to the process requirements
- Match the torque or power of a drive to the process requirements
- Improve the working environment
- Lower noise levels, for example from fans and pumps
- Reduce mechanical stress on machines to extend their lifetime
- Shave peak consumption to avoid peak-demand prices and reduce the motor size required
Description
A variable frequency drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage of its power supply. The VFD also has the capacity to control ramp-up and ramp-down of the motor during start or stop, respectively.
Even though the drive controls the frequency and voltage of power supplied to the motor, we often refer to this as speed control, since the result is an adjustment of motor speed.
There are many reasons why we may want to adjust this motor speed.
For example, to
- Unlimited starting without overheating the motor
- Electrical soft starting, no significant inrush current or line voltage drop during starts.
- Mechanical soft starting providing increased life for gearboxes and belt drives
- Unlimited speed direction changes
- The motor could operate faster than 60 Hz, increasing production rates.
- Longer equipment life, less wear, and tear
- Elimination of Water hammer in pumping systems
- Increased life of pump impeller, less wear at reduced speed
- Convert ac to dc-link
- Phase converter control
- Output frequency control
- Improved sine wave
- Better pulse width modulation
Application
As the variable frequency drive VFD reliability increased, production-related applications of VFDs started to occur to provide for a better motor speed control of the operation of the motor. Over several years of installations, the users of VFDs found several other benefits that they were not aware of. Some of these benefits ended up being quite substantial reducing system downtime, reduced production waste and extend life between maintenance shutdowns. These new benefits then became the main reason for installing variable torque drives in production equipment. Some of the other benefits are:
Technical Docs
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