What is the difference between DC brushless motors and permanent magnet synchronous motors?

What is a brushless DC motor? What is a permanent magnet synchronous motor? Many friends still do not know very well, but also has been more curious about the difference between the two also do not know much, in order to figure out the situation between the two, the following Vacuz to introduce you!

1. Different concepts.
DC brushless motor is a system, to be precise, should be called “DC brushless motor system”. It emphasizes the integration of motor and controller design, is a whole, interdependence is very high. The motor and the controller cannot exist and work independently, and their overall technical performance has to be evaluated.

AC permanent magnet synchronous motor refers to the motor, emphasizing that the motor itself is an independent device, which can exist and work independently of the controller or inverter.

2. Performance differences.

From the design and performance point of view, the design of “brushless DC motor system” mainly considers how to maintain the advantages of mechanically commutated motors after converting ordinary mechanical commutation to electronic commutation. The focus of the test is also the characteristics of the DC motor, such as speed control characteristics.

AC permanent magnet synchronous motor is mainly concerned with the performance of the motor itself, especially the AC motor performance, such as the motor’s power factor, voltage waveform and efficiency power angle characteristics.

3. Use of potential waveforms are different.

From the counter-electromotive force waveform, DC brushless motors are mostly square wave, while AC permanent magnet synchronous motors are mostly sine wave. Waveform is different, so the function of the two will be slightly different.

4. Negative control is different.

From the control point of view, quality and cheap DC brushless motor system basically does not need any algorithm, only according to the rotor position to consider the current flowing to that winding, while the AC permanent magnet synchronous motor needs variable frequency speed control, which requires a certain algorithm and needs to consider the reactive power and active power of the armature current.

From this, we can see that DC brushless motors and permanent magnet synchronous motors have obvious differences, but both are high performance motors with a wide range of applications and play an important role in our production life.

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