What does the selection of a frequency converter include?

In view of your problem, the first thing to look at is your own use, whether it is industrial or your own equipment, the most important thing is to look at your working voltage, frequency, and specific working environment, I hope to help you.

The following points should be determined when selecting the inverter: 1. The purpose of using the inverter; Constant voltage control or constant current control, etc.

2. The load type of the inverter; For example, vane pumps or positive displacement pumps, special attention is paid to the performance curve of the load, which determines the method of application.

3. The matching problem between the inverter and the load;

1) Voltage matching; The rated voltage of the inverter corresponds to the rated voltage of the load.

2) Current matching; For ordinary centrifugal pumps, the rated current of the inverter is consistent with the rated current of the motor. For special loads, such as deep-water pumps, it is necessary to refer to the motor performance parameters to determine the inverter current and overload capacity with the maximum current.

3) Torque matching; This can happen when there is a constant torque load or when there is a deceleration device.

4. When using the frequency converter to drive the high-speed motor, the output current value increases due to the small reactance of the high-speed motor and the increase of higher harmonics. Therefore, the capacity of the inverter used for high-speed motor is slightly larger than that of ordinary motor.

5. If the inverter wants to run with a long cable, measures should be taken to suppress the influence of the long cable on the ground coupling capacitance and avoid insufficient output of the inverter, so in this case, the capacity of the inverter should be enlarged by one gear or the output reactor should be installed at the output end of the inverter.

6. For some special applications, such as high temperature and high altitude, it will cause the capacity reduction of the inverter, and the capacity of the inverter should be enlarged by one gear.

Mitsubishi inverter has many setting parameters, each parameter has a certain range of selection, and the inverter can not work normally due to improper setting of individual parameters in use.

Mitsubishi inverter control mode: that is, speed control, rotation control, PID control or other ways. After the control mode is adopted, it is generally necessary to carry out static or dynamic identification according to the control accuracy.

The minimum operating frequency of Mitsubishi inverter: that is, the minimum speed of motor operation, when the motor runs at low speed, its heat dissipation performance is very poor, and the motor runs at low speed for a long time, which will cause the motor to burn out. In addition, at low speeds, the current in the cable will also increase, which will also cause the cable to heat up.

The maximum operating frequency of Mitsubishi inverter: the maximum frequency of general Mitsubishi inverter is 60Hz

Some even go up to 400hz

The high frequency will make the motor run at high speed, which is for ordinary motors, its bearings can not run beyond the rated speed for a long time, whether the rotor of the motor can withstand such centrifugal force.

Mitsubishi inverter carrier frequency: the higher the carrier frequency is set, the larger its higher harmonic component, which is closely related to the length of the cable, the motor heating, the cable heating, and the heating of the Mitsubishi inverter.

Mitsubishi inverter sets the power, current, voltage, speed, and maximum frequency of the motor in the parameters, and these parameters can be obtained directly from the motor nameplate.

Mitsubishi inverter frequency hopping: at a certain frequency point, resonance may occur, especially when the whole device is relatively high; When controlling the compressor, avoid the surge point of the compressor.

1) The actual power of the motor is determined. First, the actual cracking rate of the motor is determined, and the capacity of the inverter is selected.

2) Formula method. When one inverter is used for multiple motors, it should be satisfied: the influence of the starting current of at least one motor should be considered to avoid overcurrent tripping of the inverter.

3) Motor rated current method inverter.

The most common and safer is to make the capacity of the inverter greater than or equal to the rated power of the motor, but the actual matching should consider how much difference between the actual power of the motor and the rated power, Wu Qi usually has a large capacity for the equipment selection.

The actual capacity required is small, so it is reasonable to select the inverter according to the actual power of the motor, so as to avoid the selection of the inverter is too large, so that the investment increases.

For light loads, the inverter current should generally be selected according to the rated current of the motor, or the maximum motor power indicated by the manufacturer in the product and the output power rating of the inverter.

Summary. Hello <>

The classification methods of frequency converters are mainly as follows: 1. Classification by power: low-voltage inverter, medium-voltage inverter, high-voltage inverter.

2. Classified according to the control mode: open-loop control inverter, closed-loop control inverter. 3. Classification by application field:

General-purpose inverter, special inverter. 4. Classified according to the type of output voltage: single-phase inverter, three-phase inverter.

5. Classified according to the type of output current: low-frequency output inverter, high-frequency output inverter. 6. Classification according to control objects:

Special inverter for motor, special inverter for pump, special inverter for fan, etc. 7. Classified according to the control mode: vector control inverter, direct torque control inverter, space vector control inverter, etc.

What are the classification methods of frequency converters?

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Hello <>

The classification methods of the variable frequency converter are mainly as follows: 1. Classification according to power: low-voltage inverter, medium-voltage inverter, and high-voltage inverter.

2. Classified according to the control mode: open-loop control inverter, closed-loop control inverter. 3. Classification by application field:

General-purpose inverter, special inverter. 4. Classified according to the type of output voltage: single-phase inverter, three-phase inverter.

Trace state 5 is classified according to the type of output current: low-frequency output inverter, high-frequency output inverter. 6. Classification according to control objects:

Special inverter for motor, special inverter for pump, special inverter for fan, etc. 7. Classified according to the control mode: vector control inverter, straight posture training and torque control inverter, space vector control inverter, etc.

1.The power of the inverter is selected according to the load power carried. Choose a frequency converter with a large power for a motor with a high power of the motor. Freshman specs are also OK.

2.Inverter model Choose different inverters for different purposes. For example, there are general-purpose inverters, special inverters for fans and pumps, and inverters for machine tool spindles. Wait a minute.

3.If the load inertia is large, the braking unit and braking resistor should be selected at the same time.

4.Check the rated current of the nameplate of the motor, (the rated current is measured when there is no nameplate).The rated current of the inverter is greater than the maximum operating current of the motor.

1. Brand, mainly for cost control.

2. Performance, overload multiple, function, reliability, 3. Load characteristics, constant torque, square torque, or special load (determine the length of the load motor cable).

4. Environment: temperature, humidity. Altitude.

These are all things that need to be paid attention to when selecting a model.

And the last point is the most important, when selecting, remember not to choose according to the motor power, must be selected according to the motor current.

Depending on the industry in which it is applied.

The main products are: SAJ-S simple ultra-small, SAJ-M economic miniature type, SAJ-G general-purpose type, SAJ-F fan type, SAJ-P water pump type, SAJ-Y injection molding machine special type, SAJ-Z heavy-duty type, bare machine, industry personalized products, high-performance vector inverter S350, etc.

Motor power, as well as torque and power factor.

The weight of the load and the occasion of use.