Nowadays, brushless motors are becoming more and more popular, used more and more, and their applications are gradually becoming more widespread. However, many friends do not understand the differences between DC brushless motors and permanent magnet synchronous motors. So, let me introduce their differences to you.
The difference between brushless DC motors and permanent magnet synchronous motors is as follows:
1. Conceptual differences
DC brushless motor refers to a system, accurately called a DC brushless motor system, emphasizing the integrated design of the motor and controller, which are a whole with high interdependence. The motor and controller cannot exist and work independently, and their overall technical performance should be evaluated; Communication permanent magnet synchronous motor refers to a motor, emphasizing that the motor itself is an independent working device that can be separated from the controller or frequency converter.
2. Performance differences
From the perspective of design and performance, the main consideration for a brushless DC motor system is how to turn ordinary machinery into electronics and maintain the advantages of the mechanical steering motor after turning. The evaluation mainly focuses on the DC motor characteristics of the system, such as speed regulation characteristics; The communication permanent magnet synchronous motor mainly focuses on the performance of the motor itself, especially the performance of the AC motor, such as the power factor, voltage waveform, and efficiency angle characteristics of the motor.
3. Distinguishing the use of electric potential waves
From the perspective of back electromotive force waveform, DC brushless motors are mostly square waves, while the back electromotive force waveform of AC permanent magnet synchronous motors is mostly sine waves. The waveforms are different, so their functions may vary,
4. Control differences
From a control perspective, high-quality and low-priced DC brushless motor systems basically do not require algorithms. They only need to consider the winding current based on the rotor position. If AC permanent magnet synchronous motors require variable frequency speed regulation, certain algorithms are needed to consider the power and power of the armature current.
There are four main differences between brushless DC motors and permanent magnet synchronous motors. In summary, the trapezoidal wave mode of brushless DC motors is characterized by high torque, low cost, but high noise and torque ripple. The sine wave method of permanent magnet synchronous motor has a small torque and high cost, but low noise and small torque ripple. After reading them, I believe everyone has a certain understanding of them, and I hope everyone can choose the device that suits them.