Calculation formula: n=60f/P
The power of the motor is approximately equal to the water pump power minus the water pump efficiency minus the motor efficiency. The motor efficiency is generally 0.85, the corresponding motor power is 5.5KW, 15KW, and the rotation speed is 2900. Then the motors are 5.5KW-2P and 15KW-2P respectively. The rotation speed of the motor = frequency × 60S÷ (number of poles of the motor ÷ 2)
The asynchronous motor starts with YB, the squirrel cage type is YR, the increased safety type is YA, and then the center height and the number of poles. For example, YR400-4 560 6KV, the center height of the asynchronous squirrel cage motor is 400mm, the number of poles is 4, the rated power is 560KW, and the rated voltage is 6KV.
Extended information
The three-phase motor has a frequency of 50Hz and a voltage of 6kv and 10kv. Its characteristics are as follows:
1. Fully complies with national standards (GB/T13957-92).
2. The motor efficiency is increased by an average of 2% compared with old products.
3. It adopts box-shaped structure to achieve zero-meter layout, which is convenient for transportation, installation, repair and maintenance. It saves users' civil construction investment costs and can flexibly change the ventilation protection type of the motor according to user needs.
4. The stator winding adopts "F" class solvent-free integral immersion insulation system.
5. The motor adopts end cover sliding bearing, and adopts "air seal" and floating labyrinth device structure to prevent oil leakage.
6. The three-phase motor adopts cast aluminum or copper rotor, which ensures reliable operation.
Ventilation and protection type: The motor ventilation adopts radial self-ventilation method. The cooling air enters from the axial sides of the motor upper cover, passes through the inside of the motor, and is discharged from the upper cover along the radial sides.
Baidu Encyclopedia - Three-phase Motor
Baidu Encyclopedia - Motor Series