Is there any standard deviation range for AC motor speed? For example, the speed of 4 motors reached 1500, turn failed?
Synchronous motor speed, =60* frequency / magnetic pole logarithm8 pole: 60*50/4=750 turn / min, asynchronous speed slightly down about 735 RPM / min.6 pole: 60*50/3=1000 turn / min, asynchronous speed slightly down about 980 RPM / min.4 Pole: 60*50/2=1500 turn / min, asynchronous speed slightly down about 1475 RPM / min.2 pole: 60*50/1=3000 turn / min, asynchronous speed slightly down about 2970 RPM / min.
The alternating current motor revolution =60f/p.f is the alternating current frequency.P is the magnetic pole, the logarithm.60 is minute minute numberA four pole motor is a pair of 2 poles, so the theoretical revolutions of the four pole motor are 1500 revolutions per minute. This is the revolution of the rotating magnetic field. The actual revolutions are less than those of the rotating magnetic field. The quadrupole motor is usually 1450 revolutions per minuteThe rotating principle of three phase asynchronous motorThe prerequisite of the three-phase asynchronous motor to rotate is to have a rotating magnetic field, and the stator winding of the three-phase asynchronous motor is used to generate a rotating magnetic field. As we know, but the voltage phase power phase between the difference of 120 degrees in phase three, a stator winding of the three-phase induction motor in the spatial direction is 120 degrees, so when in the stator windings in three-phase power, the stator winding will produce a rotating magnetic field, current per change a cycle of the rotating magnetic field in the space rotation, change of rotating speed and current rotating magnetic field is synchronized. The rotation speed of rotating magnetic field is: n=60f/P, f is power frequency, P is magnetic pole, logarithm and N unit is: revolutions per minute. According to this formula, we know that the speed of the motor is related to the number of poles and the frequency of the power supply
AC motor: a machine used to convert mechanical energy and alternating current energy. AC motor has become the most common motor because of the great development of AC power system. Compared to the AC motor and DC motor, because there is no commutator (see DC motor commutation), therefore has the advantages of simple structure, convenient manufacture, relatively strong, easy to make high speed motor, high voltage, high current, large capacity. The coverage of AC motor power greatly, from a few watts to several 101000 watts, even millions of kilowatts. In the early 1980s, the largest turbo generator reached 1 million 500 thousand kilowatts.
