Electric appliance manufacturers have quit brush motors and started to use brushless motors. So what is so great about is? Well, the specialty of a brushless motor is it has neither brush nor commutator like the brush one had. Between the two AC motors, brushless motors have become more popular than brushless ones.
So, let’s have a discussion on the brushless motor and let’s know about it.
What Is Brushless Motor?
The simple definition of a brushless motor is:- a motor that has no brush and commutator and runs using direct current is called a brushless motor.
Usually, the event of converting electrical energy to mechanical energy happens here. Through this, the rotation happens.
There are two main components in the brushless motor.
- Rotor: It rotates around and there are also magnets.
- Stator: It doesn’t rotate and it contains electro-magnets.
Brushless motor specification:
Let’s have a look at the specification of a brushless motor
The winding location of the brushless motor is located in the stator. Therefore, the stator is made of steel lamination to carry the windings.
- Permanent Magnet rotor:
The rotor of the brushless motor is made out of permanent magnets. In fact, they are powerful magnets. The number of poles of the rotor can vary upon the application requirements.
- Hall sensors:
The hall sensors look after the synchronization of stator armature excitation with rotor position.
- Stationary wires:
For the stationary wires, the brushless motor produces less friction and less heat. Therefore, the efficiency increases highly.
MCU is a software that controls speed and torque. The brushless motor can produce high torque and high speed through the MCU. It can also hold high torque continuously and in the high-speed range, it can also run itself easily.
- Electric field as commutator:
Brushless motor doesn’t need any commutator like the brush one. The electric field switched through an amplifier. A commutating type device triggers it.
- Slip ring:
Slip ring transmits the power and electrical signals from a stationary structure to a rotating structure
Basic Idea about the brushless motor’s internal devices:
In a simple way, a brushless motor is inserted into the bunch of coils which are electromagnets. ESC or electronic speed controller is the device which controls the device by activating or deactivating the electromagnet’s specific points. For this, the section of the electromagnet runs for magnetic force.
The mechanism of work:
There is an armature which spins and a permanent magnet which is static. The magnets are stationary and they are on the outside and the armature moves and they are on the inside. So, for this reason, the armature is called rotor and the magnets are called stator.
In the armature there are electromagnets. When you run electricity to the armature the electromagnets get activated and then it creates the field which is magnetic. And then the magnets which in the stator get activated and they act like the South Pole and the North Pole. This makes the armature repeals again and again. But here is a fact to keep spinning operation run you have to make it sure that the polarity is constantly changing. So for this, the handle of the brushes is attached to the armature of two spinning electrodes. Thus the polarity of the electromagnets changes when it spins.
It is possible to turn the brushless motor off from inside and it becomes possible because of the advent of cheap electronics like computer and others. In the brushless motor, you run the electromagnets to the stator and insert the magnets which are permanent in the rotor. Then you can use highly powered transistors which are connected to the computer to charge the electromagnets for turning the shaft.
There are some advantages of using the computer. Let’s see the advantages.
- The brushless motor is more efficient than the brush ones.
- As computer controls the speed, it works more precise.
- Low friction for the absence of brushes
- Heat production is reduced
- The speed of the motor can be factored into the equation by the computer.
- There is less sparking so there is less noise.
- As there is no brush, there is no problem of wear out.
- It is very easy to cool as electromagnets are on the stator.
If you ask about the disadvantages then I must say that there is no such product which has no fault. So in this process, there is also a disadvantage. And that is the brushless motor is a bit pricey than brush motor. And this high cost is for an initial installment. But it is possible for you to get the cost back by getting a long time high efficiency during the life of the motor.
Applications of brushless motor:
Of the two types of motors, brushless motor is used more than the brushless one. It reduces the required power for operating the device. It not only reduces the required power but also increases the efficiency.
If you use the vacuum cleaners where the speed control is needed, the brushless motor will be needed there. Because it will operate its operation in high torque producing medium or low noise
Low prices of the devices, the quality of the product can be assured through the brushless motor better than the brush motor. Especially in price consuming matters like producing household materials in high volume.
To use hand tools with comfort, you will need them to be lightweight. You will also need high output power. As brushless contains fewer parts like an armature, stationary part, and slip ring. So, for this reason, the brushless motor is also best.
In this article, you will be assured that brushless motor is more efficient and more useful than brushless one. Efficiency is like actually how much power you are getting for rotating. 85-90% is the effective rate of the brushless motor.
So, I strongly suggest you to use the brushless motor.
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