Why does the frequency converter motor system require a braking resistor? Understood in seconds after reading
Why does the frequency converter motor system require a braking resistor? Understood in seconds after reading

On the stage of modern industrial automation, the frequency converter motor system is undoubtedly a shining star, while the braking resistor is like an unknown but crucial "behind the scenes hero". Today, let's take a closer look at this easily overlooked but actually super powerful character - the braking resistor!

Imagine a scenario where the motor is about to stop or decelerate under the drive of a frequency converter, but trouble arises at this moment. Due to inertia, the motor and the load it carries cannot stop at will. They will continue to rotate, which is troublesome as the motor directly switches to generator mode. This is like a worker who was originally working hard, suddenly being asked to stop his work, but he couldn't stop for a while and even started generating electricity on his own initiative.

At this point, mechanical energy is converted into electrical energy, which is fed back to the DC bus of the frequency converter in one go. This is amazing, the voltage of the DC bus suddenly skyrocketed, forming a headache inducing "pump up voltage". If this voltage is outrageously high, the power components in the inverter, such as delicate IGBTs, will suffer. They may be tortured by this high voltage and unable to function properly, or even damaged.

The braking resistor has appeared. It is like a super absorbent 'energy sponge', quickly absorbing all the excess electrical energy and converting it into heat energy to dissipate. In this way, the voltage of the DC bus is steadily controlled within a safe range, and equipment such as frequency converters and motors are spared.

For equipment such as printing machines and packaging machines that require frequent starting and stopping, braking resistors are also their "best partner". During the frequent on-off process of the device, a lot of regenerated electricity is generated. If not handled properly, the device is prone to problems. And the braking resistor can quickly solve these problems with electrical energy, ensuring that the equipment can operate steadily even during frequent operations, like an tireless "stability guard".

Overall, the braking resistor plays a crucial role in the frequency converter motor system. It can not only suppress pump voltage rise, protect the safety of various equipment, but also improve braking performance, meet the needs of fast parking, and cope with frequent start stop situations to ensure long-term stable operation of the equipment. With the increasingly advanced industrial automation technology, the application of braking resistors will definitely become more and more widespread, and its importance will also be increasingly valued by everyone.