Sine wave controller and ordinary controller: technological innovation in the field of electric vehi

With the continuous progress of technology, motor control technology is also constantly developing and improving. In the field of electric vehicles and home appliances, the controller serves as the "brain" of the motor, and its performance directly affects the efficiency and service life of the motor. This article will educate you on two common controllers: sine wave controllers and ordinary controllers, as well as their advantages and limitations in different application scenarios.

Sine wave controller: representatives of silence and smoothness
A sine wave controller is a type of controller designed specifically for sine wave motors. Its output waveform is a sine wave, which is characterized by lower noise during motor operation and smoother output. This type of controller is particularly suitable for enclosed three wheeled, four wheeled electric vehicles and other transportation vehicles, as low noise and smooth operation are important considerations in these application scenarios.

Normal controller (square wave controller): Strong in starting torque and load capacity
Unlike sine wave controllers, ordinary controllers, also known as square wave controllers, are designed for square wave motors. Square wave motors can provide significant torque during startup, which gives them a significant advantage in terms of load capacity. Brushless DC motors are usually driven by square waves, and the rotor position is sampled by Hall sensors as a reference signal to control the forced commutation of the winding. This control scheme is simple and cost-effective, so it has been widely used in current electric vehicle solutions.

Technical challenges and innovation
However, square wave drive may experience sudden changes in current during commutation, resulting in large torque ripple, unstable rotation, and poor noise indicators, which to some extent limits its promotion in the field of household appliances. In contrast, sine wave drive can avoid sudden changes in current during commutation, and although the maximum torque may be reduced, it has significant advantages in noise control.

To solve this problem, motor variable frequency control technology usually uses a digital signal processor (DSP) to achieve high-precision control, which requires providing sensors to accurately detect the rotor position. However, The development and application costs of DSP solutions are relatively high, while home appliance applications are very price sensitive. Therefore, the promotion of traditional DSP motor vector control schemes in the field of household appliances faces certain challenges.

In order to meet the needs of the home appliance market, a sine wave drive scheme for 8-bit microcontrollers has emerged. This solution can provide smoother motor operation while controlling costs, bringing new possibilities for motor control technology in the home appliance field.

epilogue
The sine wave controller and the ordinary controller each have their own advantages, and they demonstrate their respective advantages in different application scenarios. With the continuous progress of technology, we have reason to believe that future motor control technology will be more efficient and economical, bringing more convenience and comfort to our lives. Let's wait and see how this innovation in motor control technology will change our world.