Before the asynchronous motor is equipped with an inverter, let's take a look at the three major types of mechanical equipment loads:
1. Constant torque load: such as conveyor belt and mixer; When the inverter drags the load of constant torque nature, the torque at low speed should be large enough, and the overload should be large enough. If you need to run stably at low speeds, you should take into account the asynchronous heat dissipation ability of the motor, so as to avoid the temperature of the motor rising too high.
2. Constant power load and fan: machine tool spindle and rolling mill, paper machine; If the constant torque of the motor is consistent with the constant power speed regulation range, that is, the so-called "matching", the capacity of the motor and the capacity of the inverter are small.
3. Pump capacity: fan, water pump, oil pump. When the required air volume and flow rate are reduced, the inverter can be used to adjust the wind force and flow rate through speed regulation, which can save power by large fluctuations.
Knowing the type of load, when selecting the inverter, it is necessary to choose according to the following points:
(1) The number of poles of the motor. Generally, the number of poles of the motor should not be less than 4 poles, otherwise the capacity of the inverter will be appropriately added.
(2) When selecting the inverter, the current value of the actual motor should be taken as the basis for selection, and its rated power should be used as a reference.
(3) Each inverter manufacturer has fans, pumps, inverters, such as Siemens, ABB, Fuji, etc., to confirm the specifications and models of the motor, you can fundamentally confirm the specifications and models of the inverter (brand comparison).
(4) When the inverter drives the submersible pump motor, because the rated current of the submersible pump motor is greater than the rated current of the general motor, the rated current volume of the inverter is greater than the rated current of the submersible pump motor.
(5) When the inverter controls the roots blower, because its starting current is very large, it must pay attention to whether the capacity of the inverter is large enough when selecting the inverter.
(6) If the long-line cable of the inverter is to be operated, measures should be taken to inhibit the influence of the long-line cable on the ground, so as to avoid insufficient output of the inverter. Therefore, the inverter should be expanded by a grade, and the output reactor should be selected or installed at the output end of the inverter.
(7) When the inverter is used to control several motors connected in parallel, it is necessary to consider the cable length from the inverter to the motor and the capacity of the inverter within the easy range. If the specified value is exceeded, expand the first and second gears to select the inverter. In this case, the control method of the inverter can only be the V/F control method (fan, pump load), and the inverter can not maintain the overcurrent and overload maintenance of the motor, and the fuse needs to be added to each motor to achieve maintenance at this time.
(8) When selecting the inverter, it is necessary to pay attention to whether its protection level matches the situation on site. Otherwise, on-site dust, water vapor, etc. will affect the work of the inverter.
(9) If it is used for vector closed-loop control, the inverter and motor should be matched, not large or small, and the heavy-duty type can be selected.
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