Posted on 13th Jan 2023
More effort must be put into your operations than is required to connect a motor to a piece of electrical machinery. In order to moderate the power flow from the motor to the equipment and promote safer, more effective outcomes, you will additionally require a drive.
However, how can you pick the best drive? How do you pick a drive that suits your motor's requirements and the application you want it for?
Learn more by reading on Darwin Motion.
Different Drive VSD, VFD, and ASD Types
Variable speed drive (VSD), variable frequency drive (VFD), and adjustable speed drive (ASD) are all acronyms for the same item. This piece of equipment regulates an electric motor's output by setting the torque or turning speed the motor produces.
There are several advantages to a motor's ability to change speed, including:
Better component longevity
Soft Starters Drives
Compared to a VSD, VFD, or ASD, a soft starting drive is easier to set up, but it still has some control over the connection. A "soft start" will normally be used with these drives. In other words, they will gradually raise the motor's output at startup, lowering the stress placed on it at this time and extending its longevity.
Direct On Line (DOL) and Across the Line (ATL) Drives
A constant, uniform output from the motor is maintained using across-the-line or direct-on-line drives. Different output levels cannot be controlled, nor can speed, frequency, or any other function be changed.
This system is easier. However, it is also a less effective one because whenever it is turned on, the motor will be operating at full capacity.
As a result, the system's CO2 footprint increases and its parts can sustain more wear and tear over time.
Aligning the Ratings with the Drive and Motor
Drives are frequently graded based on their capacity for horsepower. But when it comes to matching the drive to the motor, this does not necessarily give the whole story and can even be deceptive.
Along with power ratings (measured in volts), current ratings (measured in amps), and frequency ratings, the drive manufacturer will also supply these (measured in hertz). For each statistic, an input and output rating will be provided.
The appliance or piece of equipment that is being powered must comply with the output rating standards while the motor must meet the input rating requirements.
Variable or Constant Torque
You can require either a constant or a variable torque drive, depending on the application. As the speed is decreased, variable torque loads require less torque, so the drive must account for this. A variable torque drive must be used to connect motors to centrifugal pumps or blowers.
Lift drives, cranes, hoists, and rotary and screw compressors are examples of machinery that demands a constant torque load across all speeds, where the motor torque and the load torque stay the same during steady-state operation.
Both heavy and light duty
Constant torque applications frequently, but not always, need for a heavy duty drive that can run longer at or over its maximum load capacity.
This typically applies to hoists, compressors, and conveyors where larger output levels may be necessary. On the other hand, many applications requiring variable torque call for lesser duty drives.
These applications, where the output load demand is not as high, include fans and pumps.
A drive designed for lighter workload may be able to run for about a minute at about 120% of its rated capacity before failing. While certain higher load drives may be able to extend this to a full two minutes, a heavy duty drive may be able to operate at 150% of its rated capacity for one minute.
Directional Vectors Changing
For some applications, motors may need to change the direction of their directed vectors. Examples of this include fans that may need to blast air out or suck air in at various stages of operation as well as cranes and hoists that must move both up and down while simultaneously delivering breaking pressure when necessary.
With the correct setup, a flux vector drive may alter motor speed remotely or directly using manual controls to achieve continuous monitoring of the speed of the motor. When necessary, the direction of rotation can be changed without switching phases.
Choose wisely to maximize your operation
According to Darwin Motion, it is challenging for your organization if you don't match the appropriate drive with the appropriate motor for your application. It's possible that the motor simply isn't up to the task since the necessary output cannot reach the machinery. Or you might find that the system overloads and stops working. Other problems with selecting the incorrect drive for your motor include higher operating costs, damage to system components, and unfavorable effects on the environment.
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