Inverter with low-power motor
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It was originally specified that the metering pump should have a power rating of 0.55 KW, and the control cabinet on the client’s side was also designed for 0.55 KW. Now, the power rating of the metering pump has changed from 0.55 KW to 0.37 KW. 1. Can a frequency converter with a power of 0.75KW or 0.55KW be used to control the metering pump and provide protection? In other words, the frequency converter might be one or two gear sizes too powerful. 2. Can a high-power inverter be used to control a small motor when there is a significant difference in power levels (more than two gear steps)? For example, a 132KW inverter controlling a 37KW motor? How is this determined? Can it be anywhere from 25% to 100% of the inverter’s rated current? I hope all the experts can give me some guidance!
1. It is feasible to use a 0.75KW or 0.55KW frequency converter to control a 0.37KW metering pump, and this can provide protection. The power of the inverter is slightly higher than that of the motor, mainly to ensure that the inverter does not get overloaded due to the load, while also enabling good torque control and protection. Generally speaking, when selecting an inverter, it is advisable to choose a model that is one or two tiers higher. 2. It is theoretically possible to use inverters with very high power ratings (such as 132 KW) to control low-power motors (such as 0.37 KW), but in practice this can lead to various problems, such as lower efficiency and unstable control performance. The output current of the inverter should match the motor’s rated current, with the recommended range for this current value being between 25% and 100% of the motor’s rated current. If the minimum output current of the inverter is much higher than the motor’s rated current, it may be impossible to control the motor accurately, and the motor could even be damaged. Therefore, although it is theoretically possible, in practical applications it is recommended to use an inverter with an appropriate power rating. .