The energy-saving supplier reminds you that the concept of braking refers to the flow of electrical energy from the motor side to the frequency converter side (or power supply side). At this time, the motor speed is higher than the synchronous speed, and the energy of the load is divided into kinetic energy and potential energy. Kinetic energy (determined by speed and weight) accumulates with the movement of the object. When the kinetic energy decreases to zero, the thing is in a stopped state. The method of mechanical brake device is to use the braking device to convert the kinetic energy of the object into friction and energy consumption. For frequency converters, if the output frequency decreases, the motor speed will also decrease with the frequency. At this point, a braking process will occur The power generated by braking will return to the frequency converter side. These powers can be dissipated through resistance heating. When used to lift class loads, energy (potential energy) should also return to the frequency converter (or power supply) side for braking during descent. This method of operation is called 'regenerative braking', and it can be applied to frequency converter braking. During deceleration, the method of returning energy to the power supply side of the inverter instead of consuming it through heat consumption is called the 'power return regeneration method'. In practice, this application requires an 'energy feedback unit' option.
Do you choose to use an energy consuming braking unit? Or is it an energy feedback unit?
One Energy consumption braking and feedback braking have the same effect. They are all paths that provide braking current for the motor.
II How to choose an energy consuming braking unit? Or feedback unit? This depends on the characteristics of these two braking modes. If the former works continuously for 100% of the long term, the braking unit and braking resistor need to choose a sufficiently large power, which brings inconvenience to high-power braking. For example, the heat dissipation and volume problems of the resistor are prominent, while the latter can work continuously for 100%. The volume is relatively small compared to energy consumption braking. However, the cost of energy consumption braking is much lower than that of feedback braking.
The conclusion drawn from the above is that for systems with short-term braking, it is cost-effective to choose energy consuming braking units and resistors without hesitation. For systems with long-term 100% power braking, energy feedback units must be used. For systems below 15kW, it is recommended to use energy-efficient braking, whether it is short-term or long-term. Because it is cost-effective (even with 100% power continuous braking).