In order to achieve a more efficient and controllable operation of the motor, and avoid the waste of power of the motor drive system, the inverter came into being. However, due to the wide variety of motor load types, the functional requirements for the equipped inverter are also different, so how to choose the right inverter for the motor? These are all questions before engineers.
The inverter principle is applied to the inverter principle and electronic information technology, and the output power transmission component of the AC motor is manipulated according to the change of the frequency and amplitude value of the alternating current.
The inverter should be considered according to the type of control target, static speed accuracy, speed regulation range, starting torque and other factors, to consider the selection of the corresponding model of the inverter. It is easy to use and economical while meeting the requirements of process and production. Choosing the right inverter for the entire motor system is a headache.
Strictly speaking, the size of the rated power of the motor is not directly related to the selection of the inverter. The model selection of the inverter is generally based on the load type of the motor driver, such as cranes, cranes, metal drawing equipment, mining and crushing and other high-load equipment must be two specifications larger than the motor.
The second is to depend on the rated current of the motor. The rated output current of the inverter is greater than the rated current of the motor. Ordinary fans and pumps can be matched with light-load F-type inverters 1:1; The general mechanical class can be matched with the heavy-duty G-type inverter 1:1; Roots blower and submersible pump should choose the same power and heavy load inverter... There is also the influence of altitude and temperature, etc.
When the high-power motor starts, the inverter can achieve the advantages of smooth motor starting current and no impact. The inverter is also a smart device in the speed control circuit. The speed adjustment is stable. The distance of the force is equal. AC contactors, which are common in electromagnetic starters, will produce a large inrush current when starting directly. For motors with high equipment losses. Both 400 volts and 18.5 kilowatts can be used, but the inverter is a little more expensive.
When selecting the inverter, the actual current value of the motor should be used as the basis for selecting the inverter, and the rated power of the motor can only be used as a reference. In addition, the fact that the inverter output contains a large number of higher harmonics should be fully considered, which will reduce the power factor and efficiency of the motor.
Therefore, using an inverter to supply power to the motor has a 10% increase in motor current and a 20% increase in temperature rise compared to supplying power to the commercial grid. Therefore, when selecting motors and inverters, taking this situation into account, it is necessary to leave a margin in order to prevent the temperature from rising too high and affecting the life of the motor.
The overload torque of YZ and YZR series motors is generally 212-218 times. In order to give full play to the load capacity of the motor and improve the safety performance of the potential energy load equipment, the overload capacity of the inverter-motor system must be guaranteed to be 212-218 times after the inverter is used for control.
Since the overload capacity of the ordinary inverter at 150% of the rated load is normal for 1 minute, the instantaneous overload torque can only reach 180%-200%, so it is necessary to increase the capacity of the inverter to improve the instantaneous overload capacity of the inverter-motor system.
As long as the capacity of the inverter is increased by about 20%, the instantaneous overload capacity of the inverter motor system can be increased by 210-214 times, which can basically be satisfied. Therefore, please choose an inverter with a rated capacity of more than 120% of the rated capacity of the motor, that is, the capacity of the inverter is increased by one level.
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