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How is the variable speed drive saving money

The variable speed drive (VSD) is used for control the AC induction motor, only AC motors, to save electricity and related costs.

The VSD main advantage is saving electricity, saving rate depends on the application and running time.
The other advantage is protecting the electric motor, you can see if a high power machine start, other machines will be effected like low voltage.
After you use VSD to control the motor, the power grid line is more stable and no instantaneous current shock to the electric motor.

Here is an example in energy saving, you have a vegetable greenhouse and need to control the inside temperature with a fan, but the fan doesn't need to operation at its full load all the time, how to control it according to a certain temperature automatically?
Then the variable speed drive comes to solve it with a detective sensor.

Actually more than 85 percent machines with motors can apply VFD to save electricity and protect the motors.

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