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Function Analysis and Application of Brushless Motor
- Nov 23, 2017 -

The most significant difference between brushed and brushless motors is whether the usual Brush-Commutator is configured. For the past century, the commutation of brushed DC motors has been achieved by contacting graphite brushes with a ring commutator mounted on the rotor.

    Brushless motors, on the other hand, feed back the position of the rotor back to the control circuit via Hall sensors so that they know exactly when the motor commutates (in sequence). Most brushless motor manufacturers produce motors with three Hall effect position sensors. Brushless motor brushless, so there is no related interface, so cleaner, less acoustic noise, in fact, no maintenance, longer life expectancy.

    So, what else needs to be done further? Although the motor industry deepens its understanding of the benefits of brushless motors, so far it has been limited to the development of brushless motor Hall sensor control electronics as described above.

    The current need for motor drive box and motor drive card development is extremely pressing. They provide designers with microcontrollers, programmability and drivers, all in one single package. Whether in digital or analog mode, this integrated approach essentially completes the commutation necessary for various motor applications. Without this integration, brushless motors do not work.

    Pulse-width modulation (PWM) ICs are gaining acceptance as a preferred technology when choosing the best driver. The best drive choice depends only on efficiency. The shortcomings of the linear circuit began to highlight the middle, then the output level of about 50%. At this output level, the impedance of the bypass element equals the load impedance, which means that the amplifier generates heat equal to the power that is supplied to the load! In short, the linear control circuit appears 50% at resistive loads driven at medium power levels, The lowest efficiency.

    Brushless motors are cleaner, slimmer and lighter than the one-hundred-year-old brushed motors and are moving steadily and rapidly. To their steady and increasing popularity, it is obviously over-conservative to just summarize "it is time".

    Just two years ago, brushless motors were far more expensive than brush motors. But thanks to the advances in design and materials technology, prices have dropped drastically. Today, the cost difference between the two motor technologies is only 10%. The most significant change is that designers are beginning to work closely with industrial applications. Traditionally, this is considered a field of application for hard-core brush motors because a "clean" working environment is not the most important. But now, due to the lower cost threshold, brushless motors continue to gain new applications.

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