Selection of motor
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Seek a method to calculate the required motor power based on the equipment’s flow rate and head.
I guess you’re choosing a pump, right? ! If you can’t explain in detail the purpose of your motor, how can you choose one? ! If you lack experience in system design, I think it would be better for you to provide the process conditions and entrust a design department to help with the design. Additionally, some experienced equipment suppliers can also provide free services in this area. . . Why do I have to do these things by myself?
If you are improving the system and the original motor does not meet the requirements, then it is possible that the situation you mentioned exists. . I suggest you check the manuals on pumps. . . . There are detailed calculation methods on this side. . . .
I am very grateful for the remarks from both of you; perhaps I didn’t make myself clear. The problem now is that there is some PID data available regarding the process aspects, but no electrical data at all. We need to obtain some basic information so as to be better able to communicate with the design institute in the future. So, I just want to estimate the power consumption of electrical equipment based on some equipment data related to the manufacturing process.
During the design phase of a process, the parameters for pumps are generally determined in advance; for example, the manufacturer is contacted to request quotes and obtain the necessary parameters； Then the motor power is provided by the process department to the electrical team as a design requirement. Number of operating pumps, number of standby pumps ； Reserved transformer capacity, etc. This post was last edited by cocain on 2007-12-21 18:48]
Here’s a formula for you to use in the calculations: N = Q*H*ρ/(3600*10²*η). The shaft power P is given by P = N*k, where k ranges from 1 to 1.25
Typical electric motors are squirrel-cage induction motors, while large, low-speed motors use brushless excited synchronous motors. 6kV motors should be equipped with spatial electric heaters; low-voltage motors may or may not be equipped with such heaters depending on the site conditions. Motors of 1000kW and above should be fitted with resistance temperature detectors (RTDs) installed on the bearings and windings. Motors with a capacity of 2000 kW or more should be equipped with current transformers for differential protection, surge suppression capacitors, and arresters, all of which shall be installed within the motor junction box