Determination of the motor pole count for pumps and reaction vessels
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In the motor model Y 132 S2-2, the last digit ‘2’ refers to the number of poles. According to the technical manual, the number of poles generally ranges from 2, 4, 6, to 8; however, it’s not clear what exactly this number of poles means. When selecting motor models for pumps and reaction vessels in design, which value for the number of poles should be chosen? Hoping for a reply from the Sea Hero!
The number of poles reflects the synchronous speed of the motor: the synchronous speed for 2 poles is 3000 r/min, 1500 r/min for 4 poles, 1000 r/min for 6 poles, and 750 r/min for 8 poles. The back-and-forth movement of the windings forms a circuit; the number of pole pairs is even, as poles appear in pairs. A pole refers to a magnetic pole, and when current flows through these windings, a magnetic field is generated, resulting in the formation of poles. In a three-phase AC motor, each set of windings generates N and S poles, and the number of poles per phase in each motor is the pole count. Since magnetic poles appear in pairs, motors come in 2, 4, 6, 8… pole versions. Reference: http://baike.baidu.com/view/1545285.html?fromTaglist
Thank you for the answer. So, in the design of pumps and reaction vessels, which pole count should generally be chosen for the motors?
It is necessary to determine the torque first. In physics, torque refers to the magnitude of the moment force, and it is equal to the product of force and the lever arm. Torque = 9550 × motor power ÷ motor speed × gear ratio × efficiency factor. For motors with the same power, the higher the speed, the lower the output torque. Asynchronous motor speed = (60*frequency/pair of poles) × slip rate, thereby determining the number of pole pairs
Answer No. 112471 from Haiyou was excellent; I would like to add that when selecting motors for pumps and reaction vessels, the flow rate and head of the pump are determined by the process conditions and operating environment, and it is based on these factors that the motor is chosen； The speed of the reactor reducer, the intensity of stirring, and the forces applied are determined by the reaction conditions, the size of the reactor chosen, and the properties of the materials.