Switchable Speed drive, Open Loop speed drive, closed-loop speed drives are the example of
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Variable Speed drive
Variable Speed Drive
The speed of variable-speed drives is adjustable and the drives can b operated at least two different speeds. In addition to an electric motor, these drives have a controller which is responsible for adjusting the speed. Depending on the application, the controller is accordingly complex and allows for different speed ranges and accuracy. Switchable Speed drive, Open Loop speed drive, closed-loop speed drives are the example of Variable Speed Drive.
The variable speed drive can be divided into three parts
- Switchable-speed drives
- Open-loop variable-speed drives
- Closed-loop variable-speed drives
Switchable-speed drives allow operation at least two different speeds. Example applications are switchable-speed fans and pump or traversing drives with forward and reverse operation. Asynchronous motors together with the necessary contactor controller art are typically used.
Open-loop variable-speed drives have a continuously variable speed, However, there is no feedback of the actual speed, meaning that, depending on the drive type, there may load-dependent deviation from the speed setpoint. A controller with an electronic power set lion is necessary for speed control. Examples of this type of drive are asynchronous motors with frequency controllers and V/f control.
Closed-loop variable-speed drives also have a continuously variable speed but, in addition, measure the actual speed of the motor. In this. way, deviations in the speed from the speed setpoint can be recognized and corrected. To enable this, it is necessary to have a controller with the appropriate control algorithms. Very widespread implementation of the closed-loop variable-speed drive is the asynchronous motor with a frequency controller and vector control.