Before we start, let us have a look at what exactly a VFD is. A VFD or better known as variable frequency device is a motor controller that controls the electric motor by changing the voltage and frequency that is provided to the electric motor. Some other terms for VFD are: adjustable speed drive, adjustable frequency drive, AC drive, and inverter or a micro device and variable speed electric motor.
As you may know that, the frequency is directly proportional to the speed of the motor (RPMs). In simple words the faster the speed of the motor, faster the frequency. However, if the full speed of the electric motor is not needed, than a VFD is used to change the frequency and voltage in order to meet up with the requirements of the motor.
How exactly does a VFD work?
Convertor is the first stage of a variable speed drive or a VFD. The converter comprises of six diodes, similar to the check valves that are used in the plumbing systems. They help the current to pass only through one direction.
Advantages of Using a Variable Speed Drives
It reduces cost and energy consumption: For example: if you do not need the motor to operate on high or full speed you can easily cut it down by adding a VFD. It allows you to match the speed of the motor to the load. You cannot find any other AC electric motors that will allow you to accomplish this task.
Electric motor is the reason behind 65% of the consumption of the power in the industry today. By adding VFD’s to your motor control systems, you can reduce this power consumption by 70%. Apart, from this, usage of VFD’s allows improved product quality and decreases the cost of production. By combing energy efficacy tax enticements, and utility repayments, the earnings on asset for the installation of a VFD can be as low as 6 months.
It increases production through tighter process control: It does this because the motors are operating at the required speed and thus fewer mistakes take place. This way the production is increased. The net result is that the company you work for earns higher profits.
It reduces maintenance and extends the equipment life: due to the optimal speed of the motor, your equipment will require less maintenance and thus will last for longer periods of time. As the frequency and voltage are controlled by VFD’s, the chances of thermal overload, phase protection and under and over voltage, etc is very less and this offers better protection to the motor.
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