Otherwise known as adjustable speed drive or variable frequency drive, variable speed drive or VSD is a large electric motor which speed can be altered through an external controller. It is commonly used in process flow control applications to help manufacturing plants with plenty of industrial electric motors save significantly in energy use. The application of VSD in process control applications enables the motor speed to perform the required tasks. It can also offset any changes in the variables of the process flow.
The most advantage of using a variable speed drive can be shown on how the speed of a cooling fan motor works to suit the operating temperature of the part that it is cooling. Generally, a VSD enhances process operations that involve flow control by providing soft-start capacities. This is known to reduce the possible electrical stresses and line voltage sags which are primarily caused by full startups. This is particularly true when driving high-inertia loads.
Basically, the key role of a variable speed drive is to control the rotational speed of an AC electric motor by means of controlling the frequency of power and voltage transferred to the motor. While all VSDs work under the same principle, they do the job in different ways and designs. There are three most common VSD designs that are commonly used now. These include the voltage source inverter or VSI, the current source inverter or CSI, and the pulse width modulation or PWM.
Each of these VFD designs has its own benefits and drawbacks and selecting the best one depends on your particular application, or the electric motor it is going to control the voltage and power frequency. To help you get the right variable speed drive for your application, trust the experts of the industry’s leading supplier of VSDs and gear motors, Bauer GMC. Just reach out to us today to learn more about how we can assist you to find the best solution.
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