The same power of motor, one is two, one is 4 pole in the speed and frequency condition

1. The logarithm is poles? Bipolar electric mechanic frequency speed in 2800-2900 revolutions, no-load speed close to 3000 RPM. 60 hz tribute American standard (Japan) is 3400-3600. Quadrupole motor is 1300-1450 revolutions, no-load speed close to 1500 RPM. Logarithm of np, synchronous speed for W = 3000 / np, rated speed = W * (1 - s), s is slip, generally about 5%. 2. 2, 4 or 6 pole of the motor is given polarity logarithm, the less pole logarithm, the higher the speed. 2 pole (1 to pole) synchronous speed is 3000 generator stator RPM of the motor, induction motor speed than the synchronous speed slightly wholesalemotor.blogspot.com low, about 2850 turn around, the difference between the asynchronous and synchronous speed is known as slip. 4 pole (2 pole) synchronous speed is 1500 RPM of the motor, induction motor speed than the single phase electric motor synchronous speed slightly low, about 1470 to turn around. 

Their relationship: n = 60 f/P (synchronous speed) (n = RPM, f = power frequency, P = pole logarithmic) 3. The diode in the three-phase circuit of 50 hz motor rated speed 2850 RPM, quadrupole 1450 turn around, the less the number of speed faster, the fastest speed in three-phase circuit of 50 hz is clips, the slowest is 16 】 【 I used, electric motors price direct current (dc) function of twenty thousand turn above. Diode quadrupole refers to 【 】 360 degrees in the motor stator coil of the magnetic field generated in several N S pole at the same time. 4.2 and 4 pole is targeted at the poles, the number, the more is, the more its logarithm, its corresponding rated speed is smaller, but the number is even, so no 2 4 pole pole turn fast, requirement is the same to say so