Speed behaviour depending on the torque
Operating an asynchronous motor presupposes a certain speed for a given torque. This ratio is given for any one motor.
Mn = torque at rated load
Every asynchronous motor must be able to accept at least a 160 per cent rated torque for short load spells without motor breakdowns, that is to say the rotor stops. The speed does not vary greatly given considerable load variations.
Operating characteristics of an asynchronous motor
The various motor data about the yielded torque are cited in order to provide an overview of the behaviour of the asynchronous motor between no-load and rated load operation.
This figure indicates the operational curves of an asynchronous motor by means of the following data:
Pn = 4 kW, U = 380 V, In = 8.8A, n = 1.430 rpm.
cos φn = 0.83
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