Zikodrive Motor Controllers - stepper motor drivers, brushless ESCs, bldc motor drivers, stepper motor controllers
Zikodrive Motor Controllers - stepper motor drivers, brushless ESCs, bldc motor drivers, stepper motor controllers

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Can I use ZDBL Series sensorless brushless motor controllers for dosing applications?



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 - DOSING BY TIME…

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.



Optimising BLDCApplications

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.

Brushless Motor ControllersContact us TodayZDBL10 - 10A Brushless ESC or BLDC Motor Driver with Sensorless Brushless Motor Controller using back EMF to maintain constant speed

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 - in other words we are not accurately measuring the volume of a particular substance but are approximating volume by time. Whilst this might sound slightly it is fundamentally important. If one considers a large barrel of a particular chemical - for example chlorine - which is being dosed into a swimming pool at regular intervals to ensure the water remains fit for human use then the output of this barrel must be at the bottom of the barrel.

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.

USING BACK-EMF TO MEASURE THE NUMBER OF TURNS OF THE BRUSHLESS DC MOTOR

The ZDBL Series of Sensorless Brushless Motor Controllers use back-EMF most commonly as a means of determining (and potentially adjusting) the speed of the motor. However the ZDBL BLDC Motor Controllers can also be set up to count the rotations of the motor which can therefore give a much more accurate indication of volume (depending on the type of pump being used) because if we know the volume of the pump and the rate it pumps at then we can determine that a set volume requires a set number of turns. In a test carried out with an OEM diaphragm pump on dosing 50ml using this method we generated a margin of error of 1-1.5%.

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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Frequently Asked Questions

Can I replace a DC motor with a brushless DC motor and controller?

How fast can a stepper motor go?

How complex can the programming on the Zikodrive stock range of motor controllers be?

Can sensorless brushless motor controllers be used in dosing applications?

Can a sensorless brushless motor be started efficiently under load?

Can I purchase the IP rights to a bespoke designed controller?

Do you offer on site support and assistance setting up a new controller?

What are the typical costs associated with modifying an existing stock stepper motor controller or brushless motor driver?

Can I run a motor at a fixed speed under a variable or changing load?