Pump and motor
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There is a pump that originally used a 30KW motor; if that motor gets damaged, I can replace it with a 37KW motor, provided that the coupling, base, shaft height, cables, and all other related components are also suitable for use. Is this possible? What’s the result!
If it is controlled by frequency conversion, there should be no impact. Without frequency conversion, the pump will not operate at its original design point. The pump and motor are matched; the motor is selected based on shaft power. The performance curve of the original pump can be studied.
For motors, using a large motor to drive a small load results in some power waste, but there are no other negative effects. －－No problem!
No problem. There is almost no impact; the efficiency of the motor will decrease slightly.
The rated power of this motor is related to the operating point of the pump; choosing a 37KW motor has no impact at all； The power consumption should be the same as before, without taking into account the internal losses of the motor. The cost will be higher, including the price of the motor itself, as well as the cables and the configuration of the control panel
There’s no problem, right? We’re facing this situation again here
First, let’s look at the speed: motors with a power of 30 kilowatts and 37 kilowatts have the same frame size (grade 2 speed range of 2900 rpm to 3000 rpm), which means they have the same center height. However, motors of grade 4 have a different center height; as a result, when such large motors are installed, their height is higher than that of the pump shaft； If the frame numbers are the same, it can be used, but it’s a bit of a waste!
Come and learn* it; if all other parameters are the same, there should be no problem.
The operating point of the pump has no direct impact on the rated power of the motor. It’s just that the motor’s operating point is not at its efficient point.