The brushless DC motor consists of a motor body and a driver and is a typical mechatronic product. A brushless motor refers to a motor without brushes and commutators (or collector rings), also known as a commutator-free motor. The brushless DC motor (BLDC) replaces the mechanical commutator with an electronic commutator, so the brushless DC motor not only has the characteristics of good speed regulation performance of the DC motor, but also has the characteristics of the simple structure of the AC motor, no commutation sparks, and reliable operation and the advantages of easy maintenance.
Essentially, electric motors are designed to convert electrical energy into mechanical energy, to be specific, the rotational motion of some shaft known as the rotor. The two most common motor designs include brushless and brushed motors. Today we’re going to discuss the benefits of brushless motors as compared to their brushed counterparts.
A Brushless servo motor is small in size, light in weight, high in force, fast response, high speed, small inertia, smooth rotation, and stable torque. The control is complex and easy to realize intelligence, and its electronic phase change is flexible and can be sine wave phase change.
Both motor KV and the number of poles are related to the speed/RPM of the motor. We know that as the RPM increases, the KV value also increases. Alternatively, a higher number of poles corresponds to a motor running at a lower RPM. Therefore, the relationship between the number of motor poles and the KV value is inversely proportional. This makes sense when we actually consider it.
With the more and more widespread use of DC brushless motors, its performance has also improved to a certain extent. However, various failures will also be encountered in the process of using the BLDC motor, among which the inability to start the device is one of the most common problems.
At present, we can observe the electric motors' speed control all over modern society. So, the list of speed control mainly includes an extensive range of machines which ranges from basic electrical appliances used in a household like in the garage, or garden to large industrial plants through pumps, machine tools, conveyor belts, etc. So we can notice how important and necessary this speed control technique is for several electrical machines. We cannot perform longer without an efficient method to control speed. So, the electronic speed control method is used to control the machinery as well as motor rotational speed. Next, we will discuss electronic speed control for motors, drones, vehicles, etc.
How does an ESC Work?
Tuesday, September 6, 2022
An electronic speed control (ESC) is an electronic circuit that controls and regulates the speed of an electric motor. It may also provide reversing of the motor and dynamic braking. The electronic speed controller is an essential part of an electric propulsion system's hardware. It acts like the brain of the system by telling the motor how fast to go based on data signals it receives from the throttle controller.
As a power source for all kinds of machinery, motors are used in a wide range of applications, from heavy industry to small toys. In daily use, it is necessary to adjust the speed of the forward and reverse rotation of the motor. The following describes the use of potentiometers to control the speed of brushless DC motors.
The stator of a brushless motor is the part that generates the rotating magnetic field and can support the rotor to rotate. It mainly consists of a silicon steel sheet, enameled wire, bearing, bracket, etc.; the rotor can support rotor rotation under the action of the stator rotating magnetic field, and the parts mainly consist of the rotor shaft, magnet, bracket, etc. In addition, the number of pole pairs formed by the stator and rotor will also affect the speed and torque of the motor.
The power supply of the DC brushless motor is connected to the brushless motor through the controller so that the DC brushless motor runs in one direction. Looking at the direction of the motor shaft extension, the motor shaft rotates clockwise is called forward rotation, and counterclockwise rotation is called reverse rotation. The following is explain how to wire a controller to reverse a BLDC motor.
