VSDs are chosen according to the load they will handle. If you can determine these four, you can find the perfect speed drive for your operations.
Constant Torque Load
Constant torque loads indicate the torque necessary to keep the load moving at constant speeds. It causes motors to draw high energy current at low speeds, increasing energy consumption while maintaining performance.
One example of this is a drum-type hoist that has a varied torque with the load on the hook and not at the hoisting speed.
Variable Torque Load
Variable torque loads can reduce torque at a speed less than the base speed of the load. It can also increase torque at speeds higher than the base speed of the load. A centrifugal pump, centrifugal fan, and low viscosity mixer are machines with variable torque load.
Impact Loads
Impact loads are sudden forces from the load on the motor or any part of the structure. It is not a constant force. This means that the suddenness of an impact force can throw off a machine's operation.
You must determine the usual impact loads of your operations to find the best variable speed drive.
Starting or Breakaway Loads
These loads have high inertia demand, which means they will have high torque requirements to move from the start. Once it starts moving, it would normalize into a constant or variable torque load later. It will determine your VFD's output current rating upon selection.
Bauer AC Gear Motors has decades of experience manufacturing top-notch and excellent motors suitable for various operations. Allow us to find you the best VSDs motors today by calling us.