Frequency conversion motor & # 8203; Speed range, shallow said means can ensure & other; The workings of the extra & throughout; The maximum allowable frequency range. General motor speed there is a limit, so the speed range is more focused on low frequency features. For an electric motor in accordance with 50 hz planning, if the controller can ensure 0. 05 hz full torque, so the speed range is the latter, so to speak. But generally choose V/f control frequency converter, although you can work at 0. 5 hz, but the moment is poor. So was less than the latter so wide speed range. Frequency range: inverter output of the highest and lowest frequencies. The scope of the various rules of frequency converter. In general, the lowest operating frequency is about 0. 1 to 1 hz; The highest operating frequency is about 200 to 500 hz. The above refers to the extra homework frequency converter. But in practice the biggest output frequency converter is impossible is greater than the work of the power supply frequency. That is to say, can according to the additional frequency on the motor nameplate, then know that the frequency range of the motor should be 0 hz to (Power frequency)Hz。 Frequency conversion motor variable frequency range is very large, but the maximum frequency of the use of practice of the general is not greater than the power frequency. Ordinary asynchronous motor are planning according to the constant frequency and constant pressure, can't completely adapt to the requirement of frequency control of motor speed. Add various losses will cause higher harmonic motor, additional heat loss can make the motor, power down, a decrease in output power. Three times the rotational speed of asynchronous motor cooling air volume and ejection share decreases, and cause the low speed of a motor cooling conditions deteriorate, temperature rise sharply to add, difficult to achieve the constant torque output. Let's use the inverter frequency range is 1 --400HZ； But in practice, considering the plan of the motor is in accordance with the planning of power frequency 50 hz, so use only 20 --The change of the 50 hz range. Variable frequency motor is generally by the manufacturer of the resolution, different manufacturers are different frequency range, from 050 hz, from 075 hz, and from 0120 hz, the different frequency range of motor is different.
