A brushless DC motor consists of a motor body and a driver. The motor uses signals detected by Hall ICs and rotates using the ON/OFF of transistors in the driving circuit. The brushless motor has a longer service life. Drivers are divided into high voltage and low voltage. Deceleration motors have the characteristics of small size, low noise, high efficiency, wide speed range, and small steady-state speed error. Motor installation dimensions: 60, 80, 90, 104mm, power: 10W~400W, voltage: 12V~220V.
Brushless DC motor consists of a motor body and a driver, and is a typical electromechanical integrated product. Brushless motor refers to a motor without brushes and commutators (or collector rings), also known as a commutatorless motor. As early as the 19th century, when the electric motor was born, the practical motor produced was the brushless form, namely the AC squirrel cage asynchronous motor, which has been widely used. However, asynchronous motors have many insurmountable defects, resulting in slow development of motor technology. In the mid-20th century, transistors were born, and thus the use of transistor commutation circuits instead of brushes and commutators in brushless DC motors emerged. This new type of brushless motor is called an electronically commutated DC motor, which overcomes the shortcomings of the first generation brushless motor.
Brushless DC motor consists of a motor body and a driver, and is a typical electromechanical integrated product. The stator winding of an electric motor is often made into a three-phase symmetrical star connection, which is very similar to three-phase asynchronous motors. There are magnetized permanent magnets attached to the rotor of the electric motor. In order to detect the polarity of the motor rotor, a position sensor is installed inside the motor. The driver is composed of power electronic devices and integrated circuits, and its function is to receive the start, stop, and brake signals of the motor to control the start, stop, and brake of the motor; Receive position sensor signals and forward/reverse signals to control the on/off of each power transistor in the inverter bridge, generating continuous torque; Accept speed commands and speed feedback signals to control and adjust the speed; Provide protection and display, etc.
DC motors have fast response, large starting torque, and the ability to provide rated torque from zero speed to rated speed. However, the advantages of DC motors are also their disadvantages, because in order to generate constant torque under rated load, the armature magnetic field and rotor magnetic field must be maintained at a constant 90 ° angle, which requires the use of carbon brushes and rectifiers. Carbon brushes and rectifiers generate sparks and carbon powder when the motor rotates, which not only causes component damage, but also limits their usage. AC motors do not have carbon brushes or rectifiers, are maintenance free, sturdy, and widely used. However, to achieve performance equivalent to DC motors in terms of characteristics, complex control technology is required. The rapid development of semiconductors nowadays has greatly accelerated the switching frequency of power components, improving the performance of drive motors. The speed of microprocessors is also increasing, which can realize the control of AC motors in a rotating two axis Cartesian coordinate system, and appropriately control the current components of AC motors in both axes, achieving similar performance to DC motor control and comparable to DC motors.
In addition, many microprocessors have incorporated the necessary functions for controlling motors into chips, and their size is becoming smaller and smaller; Such as analog-to-digital converters (ADCs), pulse width modulators (PWM), etc. A brushless DC motor is an application that electronically controls the commutation of an AC motor to achieve characteristics similar to those of a DC motor without any missing components in the DC motor mechanism.
