What is adaptive acceleration control?
November 2020
Motion Control & Drives
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.
Constant current is the traditional form of soft starting, which raises the current from zero to a specified level and keeps the current stable at that level until the motor has accelerated. Constant current starting is ideal for applications where the start current must be kept below a particular level.
Current ramp soft starting raises the current from a specified starting level to a maximum limit over an extended period of time. Current ramp starting can be useful for applications where the load varies between starts, the load breaks away easily but starting time needs to be extended, or the electricity supply is limited.
Kickstart provides a short boost of extra torque at the beginning of a start, and can be used in conjunction with current ramp or constant current starting. Kickstart can be useful to help start loads that require high breakaway torque but then accelerate easily (for example flywheel loads such as presses).
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.
Further reading:
Next-gen battery-driven grease gun
SKF South Africa
Motion Control & Drives
SKF’s innovative TLGB 21 battery-driven grease gun optimises lubrication efficiency and reduces costs, by seamlessly combining advanced technology with a smart, rugged design.
Read more...
Autonomous robots provide green logistics
DNH Tradeserve t/a DNH Technologies
Motion Control & Drives
In 2007, Heinrich Amminger and Martin Trummer from Austria had an idea for revolutionising warehouse logistics. They developed the automated small part warehouse – an intelligent and very environment-friendly logistics system that is winning an increasing number of customers for Ylog, a startup company.
Read more...
Precision drives on the Red Planet
DNH Tradeserve t/a DNH Technologies
Motion Control & Drives
More than 100 electric motors from maxon have been used on the Red Planet, and have withstood cosmic radiation, dust storms, and temperature fluctuations. The key to success is standard industrial products.
Read more...
Solar-powered drive solution for water pumps
Schneider Electric South Africa
Motion Control & Drives
Schneider Electric South Africa has launched its Altivar Solar ATV320 variable speed drive (VSD), a solar-powered drive solution that is compatible with a wide range of water pumps, catering for water challenges and decarbonisation of irrigation pumping and agriprocessing machinery.
Read more...
Dependable belt rip detection
Motion Control & Drives
Becker Mining has launched the newly developed BRS4.0 belt rip detection system, with advanced features for greater durability, higher efficiency, and improved safety.
Read more...
Flat face and flat face screw couplings for mining
Motion Control & Drives
Quick couplings are the critical connectors that keep mining systems running. Within the mining industry, the choice of coupling can significantly impact equipment performance, downtime, and maintenance costs. Stucchi offers flat face and flat face screw couplings that are designed to withstand mining’s unique challenges.
Read more...
The importance of original branded bolt securing products
Bearing Man Group t/a BMG
Motion Control & Drives
BMG is concerned about the proliferation of counterfeit merchandise, and the dangers associated with using inferior goods.
Read more...
New-generation drill rig
Motion Control & Drives
Epiroc is launching the new-generation PowerROC T35, offering both increased fuel efficiency and faster operations.
Read more...
Compressed air treatment do’s and don’ts
Artic Driers International
Motion Control & Drives
As a long-established importer and manufacturer of air dryers, Artic Dryers often sees the results of poor installation and issues with aftercoolers that create serious problems in air drying systems.
Read more...
Understanding standby, prime and continuous gensets
WEG Africa
Motion Control & Drives
The increasing reliance of South African businesses on generator sets to mitigate power disruptions highlights a crucial need for proper selection based on specific operational demands. Despite their growing usage, there is still widespread confusion about how to choose the appropriate genset, often leading to inefficient and costly decisions.
Read more...
printer friendly version