When selecting braking resistors for inverters with different voltage levels and capacities, especially those equipped with built-in braking units, it's crucial to ensure that the total resistance of the braking resistor meets or exceeds the allowable value specified by the braking unit. This ensures safe and efficient operation during deceleration or stopping.
It is recommended to choose one or two types of braking resistors and power ratings based on the typical range of commonly used inverters. This approach simplifies selection and improves system compatibility and reliability.
When calculating braking power, consider the system's moment of inertia, mechanical load capacity, and required stopping time. The braking power can be estimated using the formula: Braking Power = K × Energy Consumption. Proper resistance and power dissipation can be achieved through series or parallel configurations. For example, in a 380V, 22kW inverter, if a braking resistor of 27Ω is required, two 56Ω resistors connected in parallel (resulting in approximately 28Ω) can meet the demand for an instantaneous power of up to 26kW.
Additionally, when designing the system, it’s important to calculate the total moment of inertia. If the system isn't being driven, you can estimate the inertia of each stage using software like SolidWorks. The total inertia on the motor shaft includes the motor rotor's inertia, plus the load inertia divided by the square of the gear ratio, plus the transmission inertia. Accurate calculation helps optimize braking performance and reduce wear on mechanical components.
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