Therefore, the design of the brake resistor must take into account the withstand voltage of the capacitor and the IGBT module to prevent these two key components from being damaged by the high bus voltage. If any one component is damaged, the inverter will not work properly.
Emergency stop brake resistors and instantaneous acceleration are also needed. The reason why the bus voltage in the inverter increases is that the inverter puts the motor in an electronic braking state, causing the IGBT to turn on in a specific order, allowing the motor to use a larger inductive current without sudden changes, and the high-voltage bus capacitor can be charged instantly, at which time the motor speed can be quickly reduced. If the brake resistor does not consume the bus energy in time, the bus voltage will continue to rise, threatening the safety of the inverter.
In addition to adding brake resistors and braking units for rapid braking, previous attempts to use a frequency converter to drive a special punch press required the acceleration time of the frequency converter to be designed to be 0.1 seconds. At this time, when starting at full load, although the load is not large, the acceleration time is too short, the bus voltage fluctuates greatly, and overvoltage or overcurrent may occur. Therefore, an external braking unit and braking resistor are required to make the frequency converter operate normally.
Therefore,if you want to know more details for the brake resistors,please feel free to contact us by email sales@zsa-one.com
