In general, factory motors are based on the additional speed values obtained at a given power frequency voltage (380 V, 50 Hz). If 380V is not reached under actual operating conditions, e.g. as long as 300V, 50 Hz, the voltage is significantly undervoltaged. Fundamentally, it cannot reach the extra speed value, because depending on the design of the motor, it must have a voltage of 380 V and a frequency of 50 Hz. To exciter, under the additional voltage, the magnetic field strength is not reached, and the magnetic flux is very small, so it will definitely affect the rotational speed, not due to the 60f/p formula to see the change in rotational speed. For example, in the case of 380V 40Hz input, according to the formula E=K*F*Q, E insists on the same, F decreases, then the Q magnetic flux becomes larger, which is an overvoltage situation, too much excitation, the magnetic flux for a long time, will make the motor heat up and may be incinerated for a long time. Therefore, the value of the magnetic flux should not be too large, which is determined by the bearing capacity of the motor at the time of design. Usually at constant torque regulation (below 50 Hz), the magnetic flux at this moment is the additional magnetic flux, also known as the total magnetic flux. If the voltage/frequency increases, the magnetic flux value will be exceeded, causing the motor to heat up.
Constant torque speed regulation:
In other words, let the magnetic flux stick to a stable value, and v/f=q (magnetic flux) is the stable value. Why is it called constant torque speed regulation? In other words, the load torque is a fixed value, and the motor output torque is also a fixed value. See the formula: t=k*i*q, at this moment q is constant, then the motor output torque is proportional to i, because the value of q can be calculated by nameplate V (additional power supply voltage)/50 Hz, so when q is constant, the additional current of the coil (regardless of whether there is a load, after confirming the maximum penetrating current, you can also confirm the maximum torque output of the motor (you can also confirm the stable load of how much torque the motor can drive), so the overcurrent capacity of the motor reflects the overload (torque) capacity of the motor.
Under the speed of providing a stable torque, only it needs to pass through the inverter to pass through the inverter through a voltage modulated at a certain frequency (ratio of magnetic flux, predetermined value) to be delivered, and the load torque is also a fixed value, then the constant N, T and, of course, the input power P is therefore fixed. If F increases and the speed N increases, the power P will become larger, and the torque T will not become larger due to the increase in speed (this is also known as a constant torque load, such as a conveyor belt). Constant torque characteristics are independent of load torque and speed, and the torque at any speed is stable or fundamentally stable for general applications such as conveyor belts, mixers, or extruder type friction loads and cranes, lifting potential energy loads, etc.)
Another point is that the extra speed is the value obtained when the motor is idling. For the significance of this value, the higher the value and the smaller the output torque when the additional voltage and additional power are reached. This is a feature of constant power speed regulation. Formula T=9550*P/N (extra speed). Therefore, in the case of 50Hz of F-type (the output power is the highest at the moment), when n is large, it is necessary to pay attention to the fact that T is small to prevent accidents caused by T being too small and less than the load torque. In constant power speed regulation, speed regulation is done by decreasing the magnetic flux to reduce the output torque and then increasing the speed, so it is also called weak magnetic speed regulation.
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