Qorvo has launched a series of articles on motor science. Let’s take a look.

alan000345

Qorvo has launched a series of articles on motor science. Let’s take a look. [Copy link]

Consumers are demanding more power, smaller size, and higher efficiency from their home appliances, garden tools, and motor-driven products. Like many consumer electronics products, consumers expect these products to be less expensive, more reliable, and easier to use. Brushless DC (BLDC) motors help meet these demands. To meet this demand, fully optimized, highly integrated system-on-chip (SOC) devices are needed. Today's SOC devices are fully programmable motor controllers that provide efficient, compact solutions that help meet the stringent green energy efficiency requirements of 21st century manufacturers. This book details valuable information on how these SOCs improve efficiency and where to use them.

Qorvo has launched a series of articles on motor science. Let’s first take a look at " Motor Science Series丨DC Motor Controller Basics " and " Motor Science Series丨Understanding Motor Control Devices ".

In this first article, we'll introduce the various types of motors and explain how new technologies are enabling DC motors to be used in many different types of products. We'll also look at how brushless DC motors work.

In the second article, we will take a closer look at motor control devices.

There are many types of brushless motors. The most widely used are single-phase and three-phase brushless DC motors (BLDC) / permanent magnet synchronous motors (PMSM). Both BLDC and PMSM are based on the operating principle of synchronous motors. The motor starts to turn because the rotor poles try to keep pace with the rotating magnetic field generated by the stator phase switching. The rotor continues to follow the stator with each commutation, so the motor continues to turn.

However, the two DC motors have different stator winding geometries, so they produce different back electromotive force (BEMF) responses.

The Brushless DC (BLDC) motor back EMF response is trapezoidal. This means that the control waveforms required to control each of these motors are different, as the control should be based on the motor type. Figure 2-1 compares the waveforms for the two types of motors. In contrast, in a permanent magnet synchronous motor, the coils are wound sinusoidally, resulting in a sinusoidal back EMF signal (similar to three sine waves spaced 120 degrees apart). To maximize performance, these motors typically use sinusoidal commutation.

It seems that Qorvo's acquisition of Active-Semi really makes the advantage 1+1>2. Active-Semi is an expert in the field of power management. Its products are currently widely deployed, and it also has a wide product portfolio and intellectual property rights, as well as a common power system platform architecture. At present, whether it is the growing smart home field or smart cars, almost everything is inseparable from power management technology.

I am very happy that there is another strong choice in motor control chips - Qorvo. What do you think? Which motor control chip do you choose for design? I am looking forward to Qorvo.

okhxyyo

Thank you for sharing~~~ The popular science series is well written

alan000345

okhxyyo posted on 2021-3-9 10:43 Thank you for sharing~~~ The popular science series of articles is very well written

Yes, it is very clearly written, it is good to learn from it.