The capacity matching problem between the inverter and the motor

According to the design of the inverter, as long as the rated power of the motor is greater than or equal to the motor. Of course, if you choose one level higher than the motor power, the load margin of the inverter is larger, which is more beneficial to the operation of the inverter. However, the cost of the equipment will increase.

In fact, the selection manual of each inverter product will tell you how to choose. Special attention should be paid to the selection of inverter depends on the load type of the motor.

The selection of frequency converters!

I don't know your inverter model, I can only give an example.

EG: ABB, if you use ACS510, fan pump application, is light load, one-to-one selection is no problem, but if it is a deep water pump and other heavy-duty applications, you should choose a larger gear, so that the operation will be no problem. But if you are an ACS550, then the 550 can directly choose the power of the heavy load, and it is no problem to choose one-to-one.

550 directly has heavy load, light load).

Theoretically, it would be better to pick a bigger gear than a 1-on-1, but sometimes it's not necessary.

Looking at the technical strength of the manufacturer, the quality of the inverter is not good, of course, it must be amplified, and the good one is, of course, the same as the rated power of the motor.

By the way, advertise Shanghai Hongqitai current closed-loop vector inverter.

The inverters are all 220V, and the 380V ones are not.

The principle of my selection is like this, first, it depends on the power of the motor; Second, we should pay attention to the current of the load motor, for example, the current of the submersible pump is larger than the current of the ordinary motor, and the third is the starting torque, that is, the requirement of low-frequency torque;

Under normal circumstances, as long as the same power is matched, however, it is also necessary to understand the above content in order to make a better judgment.

It is necessary to select a power rating greater than that of the motor.

As long as the rated power of the motor is greater than or equal to.

The inverter and motor are matched according to the load situation. For the same inverter, the nominal power is different in the case of light load and heavy load, that is, if it is a heavy load, the rated power of the inverter will be smaller. The specific light load and heavy load depends on the output load of the motor.

To put it simply, if there is often an overloaded working state, it can be considered overloaded.

Light-load type and heavy-duty type inverter are different from the internal power device selection, heavy-duty type is at least one higher current level than light-load type, so there are currently on the market, including Siemens, there are marked, such as the inverter drag constant torque load can only use the motor, drag such as the fan pump square torque load can be used.

For example, the MM440 inverter can control the fan motor.

The output frequency of the inverter does not match the speed of the motor, and the gesture upgrade may be caused by a variety of reasons, such as incorrect inverter parameter settings, incorrect motor parameter settings, motor failures, etc. Here are some possible causes and workarounds:

1.Incorrect inverter parameter setting: If the inverter parameter setting is not only old and correct, it may cause the output frequency to mismatch the motor speed.

You can check whether the parameter settings of the inverter are correct, including the grid frequency, motor rated power, motor rated speed and other parameters.

2.Incorrect motor parameter setting: If the motor parameter setting is incorrect, it may cause the output frequency to mismatch the motor speed. You can check whether the rated power, rated speed and other parameters of the motor are correct.

3.Motor failure: If there is a fault in the motor itself, it may cause the output frequency to mismatch the motor speed. The motor can be inspected for faults, such as bearing damage, short circuit in the windings, etc.

4.Inverter failure: If the inverter itself is faulty, it may cause the output frequency to mismatch the motor speed. The inverter can be checked for faults, such as capacitor damage, IGBT failure, etc.

To sum up, the mismatch between the output frequency of the inverter and the speed of the motor may be caused by a variety of reasons, which need to be troubled and solved according to the specific situation. It is advisable to seek the help of professional technicians when inspecting and repairing.

The mismatch between the output frequency of the inverter and the speed of the motor can be caused by a variety of reasons, here are some possible scenarios:

1.The rated frequency of the motor does not match the output frequency of the inverter: If the rated frequency of the motor is inconsistent with the output frequency of the inverter, the output frequency will not match the speed of the first motor.

It is important to ensure that the output frequency of the drive is the same as the rated frequency of the motor.

2.Incorrect motor parameter setting: The inverter needs to correctly set the parameters of the motor, such as the number of poles, rated power and rated speed. If these parameters are set incorrectly, the output frequency will not match the motor speed.

3.Sensor failure: A malfunction of the motor speed sensor can also cause the output frequency to mismatch the motor speed. In this case, the sensor may need to be replaced or repaired.

4.Mechanical failure: The motor may have mechanical faults, such as bearing damage or internal wear, which can also cause the output frequency to mismatch the motor speed.

5.Faulty drives: The drives themselves can also be faulty, such as power issues or software bugs. These problems can all result in a mismatch between the output frequency and the motor speed.

In summary, if the output frequency does not match the motor speed, you can carefully check the settings and connections between the motor and the inverter, while also considering the mechanical and sensor aspects and making sure that the inverter itself is not faulty. If the problem cannot be solved, it is recommended to contact professional technical support personnel for diagnosis and repair.

If the output frequency of the inverter does not match the motor speed, it may be caused by a variety of reasons. Here are some possible causes and how to fix them:

1.The inverter parameter is set incorrectly. During the installation and commissioning of the inverter, some parameter setting errors may occur, resulting in a mismatch between the output frequency and the motor speed. Please check whether the parameters of the inverter are set correctly and adjust them according to the actual situation.

2.The motor leads the way. Especially in the case of a small motor load, there may be a situation where the motor speed is leading, so that the output frequency does not match the motor speed. This can be fixed by adjusting the pid parameters.

3.The fault condition of the motor itself. Problems such as motor rotor imbalance, bearing wear, winding short circuit and other problems may lead to unstable motor operation, which in turn affects the matching of output frequency and motor speed. Troubleshooting and repairing of the motor is required.

4.Feedback from load changes. In some applications where the load cycle changes, the feedback voltage generated by the load will affect the output frequency control of the inverter's Qi state, resulting in a mismatch between the output frequency and the motor speed.

In this case, more flexible control methods are required, such as the use of vector control, direct torque control, etc., to overcome this problem.

To sum up, to solve the problem of mismatch between the output frequency and the motor speed, it is necessary to carefully investigate the specific cause and take corresponding measures to solve the problem.

First, potentiometers.

It's time to change, it's been a long time, and the potentiometer is aging;

Second, it is caused by electromagnetic interference. The power supply used by the inverter is not pure enough, resulting in the harmonic interference from the power supply during the operation of the inverter, resulting in the unstable operation of the inverter.

The inverter is an electric energy control device that converts the power frequency power supply into another frequency by using the on-off key rolling action of the power semiconductor device. The inverter is mainly composed of rectifier (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit and microprocessor unit.

It refers to the inconsistency between the speed of the motor in the cavity hall controlled by the inverter and the frequency of the actual output, which is generally caused by the problems in the parameters set by the inverter, or the output voltage of the inverter is not enough, and the motor parameters are wrong.

In general, the first step is to check the inverter setting parameters to ensure that all parameters are correct. In addition, it is necessary to check whether the output voltage of the inverter is stable, whether the power load of the motor is normal, whether the parameters of the motor are correct, whether the current of the power supply is overloaded, etc., so as to ensure that the electric Wuyin machine can get the best control parameters and realize the matching of the output frequency of the inverter and the speed of the motor.

In addition, in actual use, excessive load should be avoided, the motor should be kept working under the rated load as much as possible, and the output voltage should be unstable and the frequency should exceed the set range of the motor, so as not to cause damage to the motor. At the same time, it is also necessary to check the motor regularly to ensure that the motor and the inverter can work normally, so as to ensure that the output frequency of the inverter matches the speed of the motor.

1 is a mismatch.

2 The reason is that the inverter controls the speed of the motor by changing the output frequency of Sakurayu, and the frequency of the inverter and the speed of the motor do not correspond one-to-one, which may lead to a mismatch between the frequency and the speed of the inverter.

3 To solve this problem, the frequency and speed can be matched by adjusting the output frequency of the inverter or recalibrating the inverter, or using a more advanced ridge and beard control system to achieve more accurate control.

1 is not a match for the first round.

2 This may be due to the incorrect setting parameters of the inverter, resulting in a mismatch between the output frequency and the motor speed.

3 To solve this problem, it is necessary to carefully check and adjust the parameter settings of the inverter to ensure that the output frequency matches the speed of the motor.

In addition, the coordination of the motor and the inverter needs to be optimized according to the actual situation to achieve better results.

1.Check whether the output frequency of the inverter is set correctly;

2.Check whether the motor is installed and debugged correctly with the ruler inverter;

3.Check whether the motor voltage meets the requirements;

4.Check whether there is a fault in the variable silver frequency.

The matching of inverter power and motor power is very important, which directly affects the normal operation and efficiency of the equipment. When selecting, it is necessary to ensure that the power of the inverter is slightly greater than the required power of the motor. The following factors need to be considered for the matching of inverter power and motor power.

First of all, you need to consider the power required by the motor. Understanding the power requirements of your equipment is key to determining the power of your drive. The power required for a motor can be known by looking at the motor power label or the motor model manual.

In actual operation, in order to ensure that the motor is working normally, the power of the inverter should be slightly increased. Specifically, the power of the inverter should be greater than the power required by the motor, usually an increase of 10 to 20.

Secondly, you need to consider the type and current rating of the motor. This is because, the electrical power required for different types of motors is different. For example, equipment such as turbine fans, evaporator fans, and circulating pumps require different amounts of electricity.

In addition, the rated current of the inverter should also be greater than the rated current of the motor. Generally speaking, the rated current of the variable excavation frequency loss should be times to times the rated current of the motor.

At the same time, the torque and speed requirements of the motor need to be considered. The torque and speed required for different types of motors are also different. For example, a constant torque motor requires a constant torque and the speed varies with the load.

Selecting the appropriate control mode in the inverter can stably control the motor speed and torque under different loads, which greatly improves the operation efficiency.

Finally, the actual needs of users need to be considered. In the process of inverter selection, it is necessary to understand the actual needs of users to ensure that the equipment can operate normally. For example, if the user needs to work under constant load, you can choose a frequency converter with a low-speed output to ensure that the motor is operating as required.

In general, the matching of inverter power and motor power needs to consider the power, model, rated current, torque and speed requirements of the motor, as well as the actual needs of users. Only by fully understanding these factors can you ensure the efficient operation of your equipment. <>

Capacity"with"Power"There is an essential difference. Usually we say how much KVA is the capacity of a large transformer, but we don't say how much KW it is, because the two are not the same thing.

Capacity, can be understood as active power + reactive power, for example, the inverter with a capacity of 100kva cannot carry a 100kw motor, because the motor consumes active power at the same time, consumes reactive power, and the reactive power also accounts for the capacity as early as possible, and may only have a motor of 70kw.

Selection principle. 1. It is selected according to the power and load characteristics of the motor.

2. The load of the fan pump can be selected according to the corresponding relationship.

3. Ordinary mechanical load inverter plus one level of power.

5. Computer interface, whether it is vector control, etc., choose the ruler key according to your own needs.

That's not the case at all.

Capacity"with"Power"There is an essential difference. Usually we say how much KVA is the capacity of a large transformer, but we don't say how much KW it is, because the two are not the same thing.

Capacity, can be understood as active power + reactive power, for example, an inverter with a capacity of 100kva cannot have a motor of 100kw, because the motor consumes active power at the same time, consumes reactive power, and reactive power also accounts for capacity, and may only be able to carry a motor of 70kw.

Power, everybody knows.