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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What is a Sensorless Brushless motor and how does it work?



A BRUSHLESS DC MOTOR WITH THE HALL EFFECT SENSORS TAKEN OUT…


A sensorless brushless DC motor (sensorless BLDC motor) is quite simply a brushless DC motor without hall effect sensors. Hall effect sensors are sensors which are built into sensored brushless motors which are used to tell the brushless motor controller exactly where the rotor position is. This can be useful for maintaining set speeds and is particularly useful at start up as the rotor position dictates the start up sequence for the motor.


OPERATING A BRUSHLESS MOTOR WITHOUT SENSORS - THE IMPORTANCE OF SENSORLESS BRUSHLESS MOTOR CONTROLLERS


Based on the fact that the motor has no in built sensors then this means that the brushless motor controller has to operate the motor without the use of sensors. One of the ways this can be achieved is through using the back-EMF of the motor to actively monitor the rotor position (and therefore speed). Put simply, back-EMF can be defined as the voltage created by the motor (as a generator). A brushless DC motor is actually very similar to a generator such as one might find in a dynamo or turbine and so as it is driven round by the BLDC motor driver it will also start to generate electromagnetic force. This then works against the forward voltage produced by the driver but crucially the frequency of the force is directly related to the speed of the rotor and can be measured by an intelligent sensorless brushless motor controller such as the ZDBL10. By using this back-EMF frequency measurement it is therefore possible to measure the speed of the motor and compare it to the speed that the brushless motor controller is trying to achieve - any discrepancies can then be adjusted if required (a closed loop system) or left as they are (an open loop system).


KEY ADVANTAGES OF A CLOSED LOOP SENSORLESS BRUSHLESS MOTOR SYSTEM


With an intelligent controller such as the ZDBL15 brushless ESC closed loop sensorless brushless motor systems can achieve impressive performance both in terms of accurate speed maintenance but also dosing performance in small brushless gear pumps or diaphragm pumps. Key to this is the fact that accurate back-EMF measurement not only delivers accurate speed monitoring but it can also be used to count revolutions of the motor.


Of course, a further additional advantage is that sensorless brushless motors and BLDC motor controllers are also lower cost than Sensored Brushless Motors.


If you have any questions in relation to Sensorless Brushless Motors please feel free to CONTACT US to discuss.









Return to FAQsTech Support ForumZDBL15 - Sensorless Brushless Motor Controller or BLDC Motor Driver

ZDBL Series Brushless Motor Drivers and Controllers are compact and lightweight and can be optimised for any BLDC motor. If you need help matching a brushless specification to a DC motor specification then CONTACT US and we will be happy to help.

Brushless ESCsZDBL5

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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?