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CAN’T I JUST USE A FLOW METER?
Of course you can, but using a flow meter can be expensive and complex and there are some other interesting alternative options which are worth investigating first….
THE SIMPLEST BRUSHLESS ESC DOSING SOLUTION -
The quickest and simplest way of setting up a sensorless brushless ESC or sensorless brushless motor controller for dosing applications is to use time. In essence this can be done through an automated system which will calibrate a specific liquid through a specific tube diameter over time. Once the amount dosed/time is known it is then possible to calibrate the system using a simple control mechanism so that if a certain volume is required, the controller will know that it needs to run for a certain amount of time. For example, if the calibration process has worked out that 10s will deliver 100ml of a particular substance then a user could input 75ml into the controller and it would run for 7.5 seconds.
There are a huge range of applications which can be effectively dealt with using sensorless brushless motor controllers. Why not explore some of our stock range and if you have a particular application that you would like to discuss please get in touch.
WHAT ARE THE PROBLEMS WITH USING TIME AS THE KEY VALUE IN DOSING APPLICATIONS?
The key issue with using time as the key ‘measurable’ in a dosing application is that time is not volume -
As the barrel reduces the pressure on the fluid will reduce. Whereas the first few doses will have practically been forced out by gravity, the last few require careful pumping to be delivered. If time were used as the key variable by which the volume was determined, it is therefore quite likely that there may be a significant difference between the first dose out of the barrel (which would have been heavily gravity assisted) and the final dose (which would potentially have had gravity opposing it). The result is a changing volume as the pressure changes.
NOTE: it is worth highlighting here that in applications where the input pressure on a pump is stable, time can be a very good measure provided all other factors remain constant (such as tube diameter, distance pumped etc.). However, in practice most applications have changing pressure of some sort so time will never be quite as accurate as other methods.
The ZDBL Series of Sensorless Brushless Motor Controllers use back-
A demonstration of how dosing can work with a sensorless BLDC controller
Accurately filling wine bottles with a sensorless BLDC controller
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