Why BLDC Motor Runs with Controller?

Nowadays, many automation equipment manufacturers have begun to pay attention to brushless DC motors. They want to use brushless DC motors to replace induction motors, stepper motors, etc., which have many defects such as low efficiency, high noise, and high power consumption. Recently, ATO has also received many inquiries from new and old customers: Do BLDC motors and brushed DC motors both rotate when powered? Actually not. Brushless DC motors must be equipped with corresponding controllers to rotate. This is determined by the structural principle of the brushless dc motor.

The brushless DC motor replaces the mechanical commutator with an electronic commutator. It is precisely because the bldc motor uses electronic commutation, so it needs a controller to drive the circuit. The commutation circuit of the DC brushless motor consists of two parts: drive and control. The two parts are inseparable, especially low-power circuits often integrate the two to form a single application specific integrated circuit.

The Hall sensor inside the brushless DC motor can sense the current position of the motor rotor, and then it will determine the order of the power transistors in the converter according to the stator windings. The electric current flows through the magnetic field generated by the motor coil and interacts with the magnet of the rotor to make the bldc motor rotate.

There is no doubt that this simple drive can only guarantee the basic rotation function of the DC brushless motor. BLDC motors also have PWM speed control, FG signal output, analog signal speed control, external potentiometer speed control, open/ closed loop control and other functions. These functions require more complex circuits to achieve. We integrate multiple functions on a PCB board to achieve control.

Brushless DC motor belongs to the category of permanent magnet stepper motors. Its performance parameters, model, power supply voltage, output power, phase angle, photoelectric switch or self-identification function must be matched with the controller of the DC brushless motor to ensure the normal operation of the bldc motor.

Brushless DC motor has neither brushes nor commutators, so if you want to maintain the direction of rotation, an electronic commutator shall be installed.

The electronic commutator must be controlled by the controller. At the same time, the controller of the brushless DC motor can control the motor to start and stop, forward and reverse, adjust the speed, adjust overvoltage, overcurrent, undervoltage and other conditions. Therefore, the brushless DC motor must use a controller, otherwise the brushless DC motor will not run even if it is powered.

The above information is the entire content of "why BLDC motor runs with controller?" compiled by ATO, hoping to be helpful to you. ATO focuses on the global industrial automation field and is committed to the research and development and production of high-performance, high torque brushless DC motors, stepper motors and supporting drive controllers. It is a leading domestic high-tech enterprise. Welcome to consult more product details.