BLDC Motors & Automation

Posted on Jul 26, 2019

BLDC Motors & Automation

BLDC motor is an abbreviation of brushless DC electric motor, also known as electronic commutation motor (referred to as ECM or EC motor), and also known as synchronous DC motor.

About BLDC Motor

BLDC motor is an abbreviation of brushless DC electric motor, also known as electronic commutation motor (referred to as ECM or EC motor), and also known as synchronous DC motor.


Synchronization feature

BLDC motors are synchronous motors that are driven by direct current through an inverter that sends out alternating current to excite each phase of the motor through a closed-loop controller.


What does the controller do?

At the same time, the controller provides current pulses to the motor windings to control the torque and speed of the motor equipment. In general, the structure of a brushless motor system is the same as or similar to a permanent magnet synchronous motor (PMSM for short). The former can be regarded as a switched reluctance motor or an induction motor, but not a synchronous motor.


Power to weight ratio

Compared with brushed motors, brushless motors have a higher power-to-weight ratio, higher speed, better electronic control, and lower maintenance costs. Based on these advantages, brushless DC motors are widely used in many scientific practices.


Robotic arm

According to practical conventions, robot science usually uses ordinary DC and AC servo motors. Recently, AC servo motors have also been widely used, because control becomes easier than before, and these motors can withstand better torque. The price of the servo motor is generally high, so the standard sensor installed is usually an optical sensor with a selected resolution.

With the introduction of BLDC motors, today's industrial robotic arms can move heavy objects with high positioning precision, but at a lower cost than other alternatives. Therefore, many robotic arms used in industry are equipped with brushless DC motors to provide the best output quality for production lines.


Linear motors

Linear motors are devices that can produce linear motion without a transmission system. The conventional transmission system needs to include many components, such as rack and pinion, ball-and-lead screws, cams, etc. A rotary motor needs to be composed of the above components.

The design of the brushless DC linear motor includes a slotted stator with magnetic teeth and a moving actuator. Actuators usually have permanent magnets and coil windings. In order to obtain linear motion, the motor controller attracts the coil windings in the actuator, which leads to the activation of the magnetic field, thus achieving linear motion.

Read More: What is a Linear Motor?


The new trend with linear motor

In the fields of automation and 3C consumables electrical, manufacturers who need to carry out new processing tasks tend to purchase machining centers with robotic arm attachments to achieve a wider range of applications. The machine tool is the most basic equipment of the manufacturer, and plays a vital role in determining the output of the production line, and the robot arm or other automated equipment is the key to determining the quality of the product.

The types of BLDC motors and machine tools are changing at any time. After the machining center and programmed control system (CNC, computer numerical control) were invented, the machining requirements became more and more strict compared with previous. Contains CNC machining centers, as well as CNC turning centers, CNC milling machines, CNC tapping and milling centers, CNC drilling and milling machines, and other customized mechanical models, all of which can be integrated with automated systems.


Together, stronger

Since some machine tools belonging to the series of machining centers also try to be versatile, the servo motors they use must also have flexibility. Although they are not as flexible as machining centers, they can be very variable in motion control. Therefore, this type of machine is usually used for customized machining tasks. Because today's accuracy requirements are more stringent than ever, consumers on the market demand better product quality and shorter waiting times, which are all challenges for manufacturers. BLDC motors help these tasks for manufacturers.


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