A sensorless
BLDC controller is a very technical controller which uses Brushless Direct
Current (BLDC) and an algorithm for filtering Back Electromotive Force, so what
are the differences and which one is best? A BLDC motor can be used for
industry and several consumer purposes because it is highly effective, compact,
easy to control, and as a result it is now being applied to the automotive
industry to aid the elimination of hydraulic systems and belts which will
reduce fuel costs and add extra functions the vehicle. In recent years the cost
of magnets and electronics have dropped significantly making the BLDC motor more reasonably priced and being added
to more items every day.
This motor
is normally operated with one or more rotor positions however it is desirable
that they are run without motion sensors as they are costly and easily
breakable this is why the BLDC motor is a sensorless operation. A sensor less
controller has to detect the rotors position the most popular method is drive
two phases and then observe the generated voltage or the back EMF, this uses a
more technical way to assess the position and speed however for machinery with
propellers this does not have a problem with sensor less controllers.
In a sensor motor you have 3 sensors which are positioned at set degree angles and the positions depend on several details which are number of slots, winding configuration and the number of magnetic poles. The benefit of sensor commutation is that the sensor knows where the motor is all the time and because of this they often stall and work at low speed. Sensor failures can mean not being able to operate the motor at all and replacing this can be very difficult and sometimes impossible.
The only major difference between sensor and sensor less motors is the use of sensors, however controllers are a big trend in the technological world and people keep finding more items to use them on and more advancement to make them more effective and accurate. Controllers are used in hundreds of items that we use every day and we are more dependent than ever on using controllers as we do more things than ever mechanically rather than physical labor. Controllers have made factories, vehicles and many other things safer to use and have made our lives easier; however this sensor less BLDC controller is at present at the forefront of sensor less control technology and has proven itself as reliable and efficient. Even though it is a very technical piece due to prices of its components becoming cheaper, it makes this sensor less controller one of the best buys available in the market.
