We need to ensure that the inverter 's capacity is matched. First, select the correct inverter type based on the load characteristics. The general principle is to match the inverter with the appropriate load characteristics.
(1) Constant torque production equipment – Within the speed regulation range, the load torque remains essentially constant. A frequency converter with constant torque performance should be selected. Its overload capacity is 150% of the rated current for 1 minute.
(2) Square torque production equipment - within the speed regulation range, the load torque is proportional to the square of the speed, i.e., M∝n2. Centrifugal fans and water pumps are typical examples. Inverters with the M∝n2 characteristic have a relatively small overload capacity, capable of withstanding 110%-120% of the rated current for 1 minute.
(3) Constant power load production equipment - within the speed regulation range, the torque is large at low speeds and small at high speeds, i.e., M?NC (constant). Typical equipment includes machine tools and winding mechanisms.
