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Question:

What is the maximum speed adjustable for a 4-stage motor with a rated frequency of 50Hz / 60Hz?

What is the maximum speed adjustable for a 4-stage motor with a rated frequency of 50Hz / 60Hz?

Answer:

Asynchronous motor speed depends on the maximum speed of the bearing, theoretically look at what the choice of bearing, above the rated speed into the constant power area, with the increase in speed torque becomes smaller, but the motor constant power area is limited, usually ordinary asynchronous motor rated Voltage is 380v motor constant power area is the motor rated speed of 2.5 to 3 times, if you want to get a higher constant power area can be reduced by the way to reduce the rated voltage constant power area, if you do not consider the reasons for mechanical bearings, asynchronous motor Speed depends on what speed the motor torque can overcome the resistance to maintain the speed.
Generally transferred to 60Hz, about 1800 rpm, although the maximum speed when the inverter speed adjustable to 135Hz, but the motor does not work. Bearing first to consider.
Motor speed and frequency of the formula N = 60f / p In the above formula N - the speed of the motor (r / min); 60 - per minute (seconds); F - power frequency (Hirsch); P - pole pairs of motor rotating magnetic fields. China provides the standard power frequency f = 50 weeks / second, so the rotation of the magnetic field of the size of the theoretical diameter only with the magnetic pole. The number of pole pairs is large, and the rotational speed of the rotating magnetic field is low.
Can be transferred to the rated frequency of 2 times, but to filter the mechanical characteristics of the motor and motor running time, to filter into the motor fever.

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