Electrical switching & drive systems & components


What is adaptive acceleration control?

Fourth Quarter 2020 Electrical switching & drive systems & components

Adaptive Acceleration Control (AAC) is a new soft start control type that allows the selection of different acceleration and deceleration profiles according to application needs. Soft starters offer a variety of methods for the control of motor starting and stopping. Each type of the control uses a different primary control parameter.


AAC is a new intelligent motor control technique. In an AAC soft start, the ASAB soft starter adjusts the current in order to start the motor within a specified time and using a selected acceleration profile. It is based on two algorithms, one for measuring (learning) the motor characteristics and one for controlling the motor. During each start it makes two speed estimates, zero speed at LR and maximum speed at the point when the motor is operating at maximum efficiency. During subsequent start and stop operations, measuring the motor characteristics and using this value to determine the speed between the two known end points provides an estimate of motor speed.

The control algorithm creates a time based speed profile which can create curves from a mathematical function. During each start and stop operation the control algorithm compares the speed estimate with the speed ramp profile. If the speed estimate is too low it increases the power to the motor and decreases the power when it is too high. This allows for control of the three accelerating and three decelerating profiles, and if the motor does not start and stop smoothly, to fine-tune adjust the adaptive control gain.


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